2000 200 efi smoking bad and running rough

[tkms002]

I have a 2000 200 EFI that starts great but runs rough through all rpm ranges and smokes something fierce at all rpm ranges. Plugs have less than 200(a guess) hours on them and look o.k. After running the engine the plugs are not fouled but are a bit oily. Smoke does not go away after running. This issue seemed to come on all of a sudden. Checked the oil adjustment linkage and that is intact. What could the problem be and how might I fix it/them?
Thanks for any help.
Bruce

 

[CharlieB]

Re: 2000 200 efi smoking bad and running rough

Start with basic engine troubleshooting.

Compression test each cyl.

Spark test each cyl using an adjustable gap spark tester set to 7/16 inch, you need a bright blue ZAP to fire each cyl when under load. A weak orange or NO spark on a couple cyl's will still allow the engine to start and rev like crazy in Neutral.

Re-post with the results of your tests.

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Well, I don't have a compression tester or the adjustable gap plug tester. Are you thinking the smoking is coming from a bad cylinder or non firing plug?
Bruce

 

[Faztbullet]

Re: 2000 200 efi smoking bad and running rough

Most likely to oil tank is not depressurizing due to faulty pulse fitting. This will cause oil to be pushed thru oil pump into the VST tank,causing a over-rich mixture. Check your oil tank in boat about 10 minutes after you shut engine off,slowly loosen cap and there should be NO pressure in it. I have seen them swollen up like a pregant guppy

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

O.K. Haven't looked at the main oil tank but I did take the cap off the oil tank that is on the motor. The oil in that tank was almost up to the cap. Is that where is should be? What and where is the pulse fitting?
Bruce

 

[starcraft1982]

Re: 2000 200 efi smoking bad and running rough

OK,not really trying to be rude here,but you asked what could be wrong.You had two replies on what to test and possible problems.You keep asking more questions w/out checking ANYTHING that was mentioned.Not sure what youre trying to accomplish.Gonna be hard to diagnose problem w/out testing anything.So,1,get testing devices and do what is asked,or 2,take your motor to a repair shop.Very simple.

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Starcraft, thanks for your response. Jeeze, I just added some additional info, thought it might point to something else or add to the equation and you were not even the one that gave me the original answer.
Bruce

 

[starcraft1982]

Re: 2000 200 efi smoking bad and running rough

Again,i wasnt meaning to sound rude,cause im not.I am just saying that there are certain things you were asked to do and you didnt do them.A compression test and spark test are pretty much mandatory for any troubleshooting sequence.then you were asked to run for 10 min and then see if you had vacuum buildup in oil tank so you took cap off OTHER tank w/out running?Most everyone on here wants to help out but since your motor cant be physically looked at by anyone,its up to you to take the steps necessary to diagnose your problem.Either that,or like I said,take it somewhere so it can be physically seen by someone who hopefully knows merc. outboards.Again its simple.No one on here can perform the diagnostics for you,but they can,and are willing to assist YOU in finding the problem(s).My comment was to help you understand that,nothing more.good luck

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Starcraft, thanks again for the clarification. What you fail to understand is that I was just adding additional information. I did not have time to do any of the tests requested yet but I did remember looking in the oil tank and noticing that the oil level was up to the top. I thought I would add that info in the hopes that it would help diagnose the issue. When I have some time I will do whatever tests suggested that I am capable of doing, I just haven't gotten around to it yet. BTW, I do have a compression tester but I don't know the exact usage of it in this situation. Can you give me a heads up on that?
Thanks
Bruce

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Can someone give me the procedure for doling a compression test? I have the guage but not the knowledge.
Thanks
Bruce

 

[hkeiner]

Re: 2000 200 efi smoking bad and running rough

Can someone give me the procedure for doing a compression test?

This is discussed in the FAQ section already. See the link below.

http://forums.iboats.com/showthread.php?t=391323

By the way, there are a lot of very helpful people on this forum who are willing to provide a lot of good advice, especially for difficult to solve problems. It is also a good itea to do a search on the forum to see is a similar question has been asked and answered before.

http://forums.iboats.com/showthread.php?t=182406&highlight=faulty+smoke

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Most excellent. Thanks so much for the links.
Bruce

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough(test results)

Re: 2000 200 efi smoking bad and running rough(test results)

O.K. played with the motor tonight and here are the test results.
Good spark on all cylinders.
Compression tester showed 95-105 psi on all cylinders after about 5 revolutions.
Aux oil tank holding no residual pressure after even 1 minute of rest.
Oil tank on motor is holding oil up to the bottom of the cap or to the top of the float whichever way you want to look at it.
Still smoking like crazy. Seems to go away a little after idling for 5-10 minutes but reving up to 2000 causes smoking to come back with a vengance.
Additional symptom. After running at 1500 rpm for a couple of minutes it would rev up and then die. Just touching the ignition switch would get a restart and then after a couple minutes it would do the same thing.
Arggghhh.
What next?
Thanks
Bruce

 

[hkeiner]

Re: 2000 200 efi smoking bad and running rough

You eliminated an over-pressurised remote oil tank as being the possible cause of excess smoke. This was one of the most likely causes so eliminating it as a cause is making progress...

Another possible cause is plugged up bleed lines or stuck bleed line check valves. Bleed lines move accumulated oil from within the crankcase to the cylinders to burn off. If the bleed lines do not work right, you can get a build up of oil in the crankcase causing smoke during idle. The on-way check valves can be tested by using a syringe and a short hose to see if air can be sucked out from the valve but not pushed in to the valve. It is unlikely that this is the cause of your smoke problem but it is an easy thing to check and eliminate.

If it was a carbed motor, I would be suggesting cleaning the carbs and resetting the floats and jets. I don't know anything about EFI and how to effectively troubleshoot the fuel injection system on an EFI. Perhaps someone else on the forum can help.

Good luck...

 

[sschefer]

Re: 2000 200 efi smoking bad and running rough

Could just be a plugged up MAP sensor. I don't think the 2000's still had a TPS.

I think you have two choices. Get the genuine Merc Service manual for your motor. It details the EFI trouble shooting procedure or take it in for service.

Teaching you how to trouble shoot it via this forum if you havent read the manual will be very difficult. It's not hard once you've read the manual and have an idea how it all works together.

 

[Faztbullet]

Re: 2000 200 efi smoking bad and running rough

Aux oil tank holding no residual pressure after even 1 minute of rest.

Engine need to run 5-10 minutes at low rpm(idle ) to correctly test this...

Another possible cause is plugged up bleed lines or stuck bleed line check valves

EFI engines does not use a bleed system like carb engines and all fuel is routed back to VST tank...

Could just be a plugged up MAP sensor. I don't think the 2000's still had a TPS.

Highly doubt its the MAP sensor and yes they have TPI sensor...
You should have had a little pressure in the oil tank in boat after a minute,pull the oil pump and your likely going to find the oil pump seal pushed out of it. If so just clean itand loctite it in place and change the pulse valve as this is what pushed it out..

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Thanks for all the help. I'll take a look at the oil pump. Where is the best place to get the service manual?
Thanks
Bruce

 

[tkms002]

Re: 2000 200 efi smoking bad and running rough

Should I get the real merc shop manual or are the clymer or seloc manuals adaquate?
Thanks
Bruce

 

[sschefer]

Re: 2000 200 efi smoking bad and running rough

Should I get the real merc shop manual or are the clymer or seloc manuals adaquate?
Thanks
Bruce

Get the real one... And be sure to look close at the MAP sensor. If it's plugged up with gunk the engine will idle very rich and produce a lot of smoke.

The TPS sensor, if it has one, if out of adjustment can also produce an over rich condition at idle. It's usually accompanied by an off idle stumble.

Once you get the Genuine Merc Service manual you will see how the system works and since you actually have the system you will understand how. It's a pretty simple throttle body injection system but it does depend on reading the throttle position and the manifold absolute pressure to determine the duration of the injector pulse.

Regular maintenance on these engines is checking the MAP sensor, the TPS and the injector flow. There are several other diagnostics that can be done with diagnostic equipment attached to the ECU. Usually a shop will have the equipment and can nail down your problem in a matter of minutes. It's often worth the cost of the diagnostics since it can save you a lot of hunt and peck troubleshooting.

 

[Faztbullet]

Re: 2000 200 efi smoking bad and running rough

Check your pm for a link to the factory online manual and like I posted doubt its the MAP as its built-in the ECU,(all you can check is hose and if it leans out with a vaccum source)usually when they fail(MAP) the ECU is toast.. I agee the TPI will cause problems but not this rich and ALL Merc's with a ECU have a TPI, the only ones that wont will have a aftermarket ECU/ACU installed...