86' 150 XR2 Advance module

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57chevyeddie

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While at the lake a couple weeks ago, my XR2 would'nt run right. I idled out of the "no wake zone" and gave it the gas but it would'nt go. Long story short, back to launch with the trolling motor as my oil injector alarm started sounding. Back on the trailer we only had spark on three cylinders. We suspected switch box. I noticed while examining the problem, the red wire from "advance module" was burned looking where it connects to the switch box. As I pulled on it, the insulation broke at the terminal. I checked closer and the wire seemed almost broken at that point. I added a short piece or wire after cutting about 3 inches off, looking for a solid point in the original wire. After reconnecting the the engine still had issues so I took it home. When I checked for spark I ony had three on one side. The other side was dead. I took it home and orded a switch box. To double check I reversed the inner and outter switch box. Now I have spark on all six again. It seems to be oiling the fuel, no alarm, plenty of smoke. Now the idle is rough, and it pops out the exhaust. Sounds like a back fire. I dissconnected the advance module and the popping stopped. It sounds better but it idles a little rough. Do I need to replace the Advance Module? I'm ready to get back to the lake. Thanks in advance for your advice. Eddie:confused:
 
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CharlieB

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Re: 86' 150 XR2 Advance module

Ditto, if the module advances while at WOT you may be looking for another powerhead, cause it can destroy this one.
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

Will do. I guess I'll follow the instruction in my manual to reset timing. Just leave out the part about reconnecting the "advance module". Will a regular automotive timing light work? I'm a little new at this. Are there any problems following the instructin in the manual. Thanks :rolleyes:
 
j_martin

j_martin

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Re: 86' 150 XR2 Advance module

Original WOT timing is 19? and the advance module takes it to 23? at 5000 rpm. Remove the advance module and chit can it. Set your WOT timing to 23? You may or may not notice a slight improvement in performance between 5500 and 6000 rpm if you run it there. Won't hurt, it loves it.

Charlie B's right, a short to ground on the bias wire at WOT will usually cause the engine to throw parts at you.
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

I've never set timing on a boat motor. Can you walk me through it? I'm excited to think we may have my motor running right soon. I'll be off this Friday and could set that timing. Does it need to be in the water? You guys are the best. Thanks!
 
j_martin

j_martin

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Re: 86' 150 XR2 Advance module

That's a very quick and insufficient procedure at "the marine doctor". It's best to do the entire linkage and timing procedure in the maintenance manual.

For one thing, your timing pointer is adjustable. If it's off, so will be your timing. Setting it's position is part of the above said procedure.

Other critical aspects of engine operation are also adjusted, such as throttle pickup timing.
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

I started this proceedure but had trouble with my timing light. It works on my truck but not on the boat. What's up with that? The manual told me to disconnect the fuel line and the wiring harness. Can it still work the timing light if the wiring harness is disconnected? I put it all back together and tried the light with the engine running. Still no flash. I pulled the boat outside to pit the "muffs" on and noticed a little misfiring. I think I need to troubleshoot the switch boxes. I had moved them earlier because 1,3, and 5 was not firing. After I hooked them up to the opposite bank it ran better but not 100%. While on the "muffs" I noticed some unburned engine oil coming from the exhaust is this normal? Tell me about checking the switch boxes. Can I get OEM boxes? Do I change them as a pair? HELP PLEASE! I can do this if you will help me. Thanks.
 
j_martin

j_martin

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Re: 86' 150 XR2 Advance module

Unless you own a money tree, I suggest you back off from whatever your thought train might me and troubleshoot the engine from the ground up, one step at a time.

Compression
Spark, across a 7/16 gap, on all 6 at cranking
fuel to all 6
then from there, depending on what you find.
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

I don't own a money tree. Thats why I interested in learning by asking these questions. I have tried to follow the instructions in the manual. The stator check good. The rectifier checks good. I'm confused on how to test the timing and the switch boxes. I want to prove what is wrong before I go buying a bunch of parts I really don't need. That is good troubleshooting, right? I'm only tring to understand what I'm doing so that it makes sense to me what the problem is. Sorry if I sounded like I was just throwing good money away. I am a do it your selfer. I just need a little guidance. Thanks. I will test beginning with compression tomorrow. What do you think is going on with my timing light not working on the XR2 but it will work on my truck?
 
j_martin

j_martin

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Re: 86' 150 XR2 Advance module

The XR2 has a hot enough spark to knock you on your can spinning. If it didn't flash, there's no spark on that cylinder. I'm assuming you had the plug wire connected and the plug is good, ie not shorted by carbon or something. Also assuming you're using a clamp on (inductive) pickup for the timing light.

With the right instruction book (factory service manual) and a DVA or DVA adapter and multimeter, you can test all the ignition parts while cranking. Timing is covered in the linkage and timing adjustments section of the same manual.

Resistance testing of the stator is a rough test. It will not reveal a single turn short, which will cause the stator to fail and is a fairly common fault. DVA testing will find this fault.

DVA stores and reports the peak voltage. Most of the voltage waveforms in this engine are deformed, not sine waves, so DVA and RMS values cannot be compared or even related to each other.

hope it helps
John
 
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Ballymac

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Re: 86' 150 XR2 Advance module

U have a 2 stoke engine - ur timing light is probably 4 a 4 stroke. j martin is on the money - u need to dynamically test the components - ohm testes will not reveal everythubg. a DVA or peak voltage meter goes a long way with ignitions. Good luck
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

Ok, it's make sense to test with a motor running in lue of standing still. I've to check to see if my Fluke digital will work for the DVA test. It has a "hold" button on it. I'm not sure what model meter it is. I"ll get my book out on it today and see if it is what I need. I did'nt know about the different timing lights. Thanks for the help. I don't mean to be so slow catching on. Bear with me. Eddie
 
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CharlieB

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Re: 86' 150 XR2 Advance module

A Fluke will work fine,
IF.......... you add a DVA Adapter to it.

The peak reading feature is meaningless without the LOAD imposed on the circuit by the DVA, either meter or adapter.
 
fisherman81654

fisherman81654

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Re: 86' 150 XR2 Advance module

j_martin said:
That's a very quick and insufficient procedure at "the marine doctor". It's best to do the entire linkage and timing procedure in the maintenance manual.

For one thing, your timing pointer is adjustable. If it's off, so will be your timing. Setting it's position is part of the above said procedure.

Other critical aspects of engine operation are also adjusted, such as throttle pickup timing.
Click to expand...

This procedure worked quite well for my 175 mariner 1985 engine.
Agreed that if someone has messed with the timming pointer on the flywheel cover,the timming may not be set correctly with this procedure.
 
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57chevyeddie

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Re: 86' 150 XR2 Advance module

I'm not understanding the test procedure for doing the DVA readings on the stator and trigger. I need to get a simple, easy to understand, detailed instruction on testing these components. I plan on buying an adapter to read the peak voltages. Is there an article that will tell me, step, by step how to get these readings. Something in layman terms. You guys lost me back there when we got to talking about sign waves, occilliscopes and the like. Try to keep it simple for those of us that don't have all that experience. I can't stand the thought of going to some marina to get help and get took to the cleaners. I just need someone that will get me on the right path. I'm off tomorrow and plan on giving it another shot. I'll probably start with the compression test, then the spark test. All the ohm test so far read good. Thanks in advance for the support. Eddie:)
 
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