Help!!!!!!! Need to test fuel injectors !!!!!

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

rodbolt is correct, you need to put a fuel pressure gauge on it. the hpdi's run some serious pressure though, your going to need the pressure gauge spec'd in the manual and not some autozone one.
if you have a complaint that comes in like yours... and you suspect its fuel system related.. then you have to go through the whole system. (that's why marine repairs get pricey... story to follow at the end)
In going through the entire fuel system my next step would be to check the fuel pressure and the pressure regulator and it's associated vacuum lines. you need to check the pressure at idle, record, pinch the vacuum line off, record, check the pressure at about 2500 or so (or whatever the manual spec's), record, and give the vacuum line a quick pinch (just fast enough to watch the needle) It's possible your pressure regulator is sticking, (or the vac line is broken) and not bleeding off the extra pressure at idle, causing an overly rich condition causing the motor to dog at idle speeds. when you rev it up... the pressure is right where it's supposed to be, the motor leans out, and runs like a champ.
 

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

On to the story... (unrelated so skip if ya want to) I'm a wrench on the run as well... i hate doing it, but i make quite a bit more money than working for the dealers, i get to make my own hours, and the only person i have to answer to is the customer in front of me.
In this business you have to be very good at connecting the dots, explaining why failure A, was caused by bad part B. If you are not good at this, you will have nothing but headaches caused by frustrated customers (and they are frustrated partly because of the expense and partly because they are uneducated about what goes on in these motors).
To combat this frustration, you can do 1 of 2 things, you can work for free hence lessening the expense, however my bank does not morgage my home for free so that's really out of the question. Or you can educate your customers by connecting the dots, and explaining to them in plain english (not techno jargon) the in's and out's and the hows and the whys. More than half of the work I get is caused by nothing more than customers not following the preventative maintenence as described in the owners manual of the boat/engine. The customer does not need a factory service manual, it's all outlined in the owners manual. There is a old saying that mechanics love, it's pay me now, or pay me later, either way your paying me.
Now whenever i get work that is caused by failure to follow PM (preventive maintenence) after the work is done I take the extra 10 or 15 minutes it takes me to follow up with an email and a copy of the PM as outlined in the service manual. About 90% of the time doing that get's me more business, doing PM work. 10% of the time the customers stance is "just fix it so i can sell it". Either way, in doing that, the customer is more educated 100% of the time, and that's the most important thing. To me it's not that important that they are educated and they may be doing their own PM work that is costing me business, its more important to me that they are educated to a degree that I don't have headaches. The best thing about taking the time up front, is you typically only have to explain yourself once. The first time out to a new customer/boat is about always the same. As you sit there doing your thing, they are cautiously eyeing you, sizing you up. For them, the customer... isn't looking to get taken advantage of.
 

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

Once you do your work and explain it all to them, and hand them the bill and leave... you know you've done well they call you 3 or 4 months later and they are having trouble with something else and they say to you... "this is acting up, i need it fixed by ##day, there's a blank check under the seats in the cuddy, just call me when your all set so I know how much it was". That's when you know you've made a customer.

The last bill "shock" i got went something like this. I have this customer who runs a kayak/sailboat business. He has 3 locations. At all 3 he needs to have a running powerboat to bring people back in, do rescues etc. At this point he is not the "check is in the cuddy" type customer. Often, I am called out to 1 location, when he is at another location.
The last job I did for him was a starter on a johnson outboard (a 150 to be exact) For him, the work needs to be done immediately, because he cannot run his business without a working boat.
The complaint was the motor turns over but does not start. I killed the batterys (boat has 2), bought 2 new ones, still turns over but does not start.
So I get out there, he meets me in a hurry and say's i have to run, do what you have to do to fix it, if you can't get ahold of me tell my manager what's wrong with the boat but just get it fixed.
The first thing I do is hook up my handy dandy steven's spark checkers. No spark. I dissconect the harness... still no spark. I open my handy dandy rapair marine technician ignition system bible (a must for everyone) and flip to the approriate section and dva charts. This johnson has an OIS (optical) ignition system and it's about a 27 step process to troubleshoot. I'm doing my tests and everything is coming back ok then I notice the cranking rpm is really slowing down fast on this thing for what is supposed to have a new battery. So I stop at about step 12 to check the battery.
I put my load tester on the battery, comes back good. Then i throw my amp clamp around the starter cable, 250amps.
Uh-oh I thought, mission control we have a bad starter.
But here is where going through the entire system is necessary. The boat has 2 batteries and a battery switch. The bats are located under center console and the switch is tucked up under there as well. When doing a starter job it is imperative that you do a point to point voltage drop test across the ENTIRE starting system. That includes the battery, all cables, the battery switch, the solenoid, and all grounds. In a boat like this it takes more than 10 minutes to do. Especially when it is on the water and bouncing around. Turns out his main battery cables (both) and 1 of the jumpers going to the switch were bad. If you know ohms law (E=I/R), you'd see that the voltage drop in the cables was causing the starter to draw extra current. since current = heat, heat causes insulation breakdown in the starter, insulation breakdown causes shorts to ground, which draws more current, which generates more heat. It's a downward spiral.
Now this is the starting system. The igniton system, is a seperate issue, or so it may seem. Before I went ahead with the starter, I continued reading the ignition system troubleshooting chart. In this motor, the optical sensor needs to see 11+ volts (seems high, but thats what the manual says) in order to function. I test the wire and it's not even close. And it's not close because the starter is eating all the the current (causing more of a voltage drop) in the system.
I grab the manager (as the owner was not available) and I explain the situation. I tell her that the starter/cables are bad. I also tell her that this may or may not fix the actual starting issue. I tell her (in the least amount of techno jargon possible) about everything, but the fact of the matter is, is that I can not troubleshoot an ignition system without a fully funtioning starting system. She agree's to the repair and I get to work.
I pull the starter (to send off to the rebuild shop) and on the way back I stop at wests (ughhh retail pricing times 100... but they have cable). I drop the starter off at the shop and they call me about an hour later. They say sorry, this one is toast, non-rebuildable. They can have me a new one (aftermarket, but new) the next day. I ask to make sure it's not some chineese knockoff, becuase the price of the aftermarket was the same as the dealer. They say it's an arco, and i know they are ok. With the price from the shop being the close as factory, just a few bucks higher for shipping, and the fact that they can have it next day, and the dealer says probably a week. I go ahead and order it.
I get it the next moring, go back to the boat and install it. I also make up, and install the new cables. That was a bit of a pain. It was an aluminum boat and all the cables where run under the floor. I had to undo the console, tilt it back. And take up 3 of the floor panels to access the cables. Before you say "just pull the cables through". I would in a glass boat, but never in an aluminum boat. As the hull is grounded 1 little nick in the 4 gauge cable would turn the entire wire into a 20ft long, 600amp fusable link... causing death to all on board.
As Murphy would have it... half the stainless steel screws heads where stripped out, and they had to be drilled. Stainless is very particular on the torque you apply to it.
After it was all said and done, I pulled back out my handy dandy spark checker and voila, spark had returned. (screw you Murphy!!) I re-did the voltage drop test and it all checked out. Amp clamped the starter 1 more time and it was at a healthy 130 amps. I give the motor a push of the key then a twist, start her up, then take it for a 5 minute spin around the lake. When I get back I flip the amp clamp over and make sure she's charging.. (as bad cables can kill a regulator as well)
Well... i'm satisfied at this point. So i pick up everything, get it all back in the truck, grab my invoice book and get to getting paid. I write everthing out. Bring the slip to the manager. Explain how everything went back together, and explain how the ignition system not functioning was caused by the bad starter. I then hand her the slip and explain every little note and line item i wrote down on it. Then I get to the total, and I haven't seen a jaw drop so fast since the last time an adulterous queen was sent to the guillotine.
As the acronym b.o.a.t. stands for "bring on another thousand" The bill was about a thousand bucks.... before your jaw drops here's the rough breakdown.
330 bucks for the starter
260 for 45 feet of battery cable, and crimps
360 for labor @ 60hr x 6 hours
it took an hour to diagnose
about 1/2hr to pull the starter
about 1/2hr to install it
2 hours to pull up the floor... because 1/2 the screws were stripped out and needed to be drilled
an hour to make up the battery cables, and install them
and about an hour to put the floor and console back together, retest the starting system, check the charging system and a quick water test.
and I have a flat fee of $50 per job for drive time, which also covers my commute and also drive time to and from getting parts.
Now when gary got word of the bill he damm near sh!t a brick. He was quick to mention that the starter on his chevy tahoe went out last year and that that repair was less than 200 total. So I had to explain it all over again to him. I had to connect the dots from how when a starter is run with bad cables it will eventually destroy itself, i had to explain that just replacing that starter withought cables will only cause the new starter to eat itself as well. So on, and so forth. I then showed him the PM chart for his engine, I pointed out the part about having clean terminals and cables and noted as how it was stated by johnson to be checked every 3 months (could be 6, i forget at this point) and I asked him the last time he had done that. He obviously never had himself, and didn't know if it was ever done by previous mechanics. (as bad mechanics are notorious for skipping PM checks)
The moral of this story is that I know I did my job and I did it well. I hardly ever at this point have to explain anything to gary. He calls and says there's a check on the boat, go fix it, and just let me know how much it is. Now not only do i do his repair work. But I also do his spring commisioning, a mid season check up, and winterizing on all his boats. And I do so 99% of the time without a question from him. I'll never take advantage of that, because any potential headache is worth no amount of money to me. On top of that I get paid to do the work, not to talk about justifying bills. Time is money.
Pay me now, or pay me later, but either way your going to pay me.
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

I think I may have confused you with all my posts , i do not have HPDI , I have a 1998 EFI,
I just heard from the Injector shop he checked them all again, they all bench out perfect........... So here I am back at Square one, I guess move on to ignition.???????

Or I am at the point know to just let it be and think of it as having my own massage chair on my boat it vibrates so much.
 

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

efi will have a fuel pressure regulator as well... as well as a test schrader valve on the fuel rail... if it is strait up efi then a normal efi fuel pressure gauge will work.
 

rodbolt

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

ok. captjason is similar to what I do.
I am basically a contractor to several marinas in my area, as I have been doing this workfor about 30 years,with a six year break as a CNC lathe and mill programmer and a 6 year break as an FC in the USN, mostly what I have done is fix things.
but now I contract, the pay is good but the tolerance for error is zero. just like it should be.
you have a screen behind the pressure regulator that needs to be cleaned now and again as well.
to attempt to test/troubleshoot OX66 you MUST have the tune up spec guide,a fuel rail pressure guage,a diagnostic test lamp and a DVA/dvm meter
without it your sunk.
its all easy but its time consuming.
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

I have all of the tools you refered to but the Fuel preasure gauge. Is it the same as a automotive one?
I have a EFI 225, It does not say OX66 on my engine cover ? I was wondering if there was a difference?

Is the Filter in the VST tank that should be cleaned. It is the only other one I see in the service manual.
 

rodbolt

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

there is a filter on the engine,paper element type, a filter on the pump in the VST and a filter behind the fuel pressure regulator.
the ox66 3.1L motors were not particularly smooth at low speeds anyway.
but the only way to test them is with the tuneup spec guide,a peak reaking meter and time.
the fuel rail takes a standard test guage with the small schrader valve attachment.GM sometimes used the large Valve.
 

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

maybe someone that works at a yamaha dealer can chime in (i dunno if you do or not rodbolt)
But, and my memory is fuzzy on this because it was years ago, but in my last yamaha factory training class as few years back i thought i remembered something like on the first couple of years of yamaha efi they actually programmed the ecm to drop a few cylinders at idle in order, in a round about way, to get a 3 star epa certification... they did this because the epa test measures CO at idle speeds. is this ringing anyone elses bell too? because of this they had a lopey idle?
 

rodbolt

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

captjason
your right and wrong and yes I do. in fact I made the first round of Yamaha master techs. they got my pic on a website and I aint wearing stripes :):)
the V series 3.1 motors DO NOT use CCS.
the rest DID use a form of the CCS and yes will shut down cyl2(ithink) between 800 and 1200 RPM and 2+5 between 1200 and about 2000.
which is why I say test everything. to many techs will just say the 3.1 shakes. it does but usually its broke.
the 3.1L V76 and OX66 were not the smoothest running engines but were desined way before CARB standards were imposed.
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

My 98 EFI 225 never ran really smooth. i know that it's drops cyl at low RPM but know it's just to much, all my windows and top shaking bad. I am going to pull the VST tanks filter and check the Fuel rail pressure tomorrow.
Should i check the low pressure fuel pumps? It's been 6 -7 years never have been checked.
 

rodbolt

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

6 or 7 years? I would bolt on a new set.
 

drewmitch44

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

Cap jason what are you talking about??? Bring your multimeter over to my house and see if my garden hose is kinked or if there is a hole in it. I can use a multimeter to test the soil in my garden. Testing injectors with a multimeter is just a waste of time. Like trying to see how manny times you can pull them off and put them back on without screwing them up. just dosent make a difference. do you use the tip of the multimeter to see if the screen is clogged by the diameter of the tip against the screen? Thats like when the car repair guy says that your muffler bearings need replaced. Or its your conuter valve that is the problem. Dont mean to be a wise *** but its just a waste of time plain and simple. Dont need to type a bunch of specs about how the test works thats just another waste of time.
 

JustJason

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

if your garden hose has an electriod solenoid attacted to it i'd be glad to.
if you knew anything about electricity you'd know that you can't measure resistance in active circuits... you can only measure voltage drop, current, EMF or inductive kickback.
Inductive kickback is a great way to test all active components... if you know what your doing. it's not the only test, but it's 1 of many and i feel it's a good shortcut test to help you narrow down problems, as it only takes minutes to do. Just like kv testing.... another fantastic shortcut if you know what your doing. You can check for a drop in ign or fuel or compression in 1 shot... if you ponied up the money for the tools and the education.
kv and inductive kickback are not the end all to all tests.... and they are never listed in the manuals... (because some people don't even understand how to do what the manufactorer specs, and they are too cheap to buy an autozone compression tester... let alone everything else)
So... while your topping off my gas, could you please get my winshield, check my bumper grease, and refill my blinker fluid.. :)
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

Ok , Today reinstalled injectors that where rechecked ,removed the VST tank cleaned filter that was very dirty, cleaned Fuel pressure regulator small filter, checked all low pressure pump diaphragms looked fine. The only thing have not done is check the fuel pressure, Have to get a tester.. After all that still runs rough at low RPM.... BUT It is very intermittent, it will clear up for a few seconds run smooth then back to rough. I really do not know where to go from here????????????
Should I be looking into fuel tank, water in fuel? pickup tube?
The motor still runs great at mid to high rpm very smooth..
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

Talked with the local Yamaha dealer mechanic to day. Told him what I did so far. He suggested unscrewing off the spark plug wire ends and checking them with a omm meter. he said there are resitors in the ends and they can go bad and get broken from taking off the engine cover over the years and poss banging them.
I found one out of six making good continuity ! all the rest where intermittent or or not having any continuity at all.
I really hope this is it? after the whole time thinking it was a fuel problem?
 

SuzukiChopper

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

Think of it this way, when you replace the spark plug wires, you should now have 2 of the three systems needed to make a motor run looked after. Compression is the only outstanding one (sorry, forget if you did that check). Just a little bit of optimism for you. Those wires shouldn't be huge $$$'s compared to what you have done. Hope it works out!
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

I was thinking it was spark related all the time. It's not the actual wire it's the 45 degree end caps that snap onto the spark plugs. they screw into the wire and have resistors in them that go bad and they are only $10ea for a change something is cheap. hope this is it??????
 

Bobalex

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

I have a Yamaha 225 EFI and am beginning to think my problem is injectors. Sometimes only run about 2300 rpm and then will cut in and get to 3300 rpm but it seems to idle smooth. Any suggestions? Going to expose how ignorant I am. Where are injectors located so I can remove them and have them checked? Does this sound like injector problem? Rodbolt I'm sure you can tell me. Forgot to mention it's a 2 cycle.
 

magnoman

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Re: Help!!!!!!! Need to test fuel injectors !!!!!

What Model motor do you have? You might no even have injectors/ does not sound like injectors to me..Sounds like a ethanol fuel problem. depending on how old your boat is and what kind of material your gas tank is made out of. Put in a bottle of the ethanol fuel treatment. clean all filters and if you do not have one install a inline fuel/water separator filter.
my yamaha dealer mechanic has been telling me that some people"s boat's getting around 3k rpm and just shutting off then kicking back in an some guys have been getting injured from smacking there heads on the wheel.
The guy next to me at my dock has a 20ft w/ a 150 johnson he said he gets to 3200 rpm and his dies at times.
 
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