only running on 1 and 2 - Help

[maldoro]

2006 Johnson 115 V4 Crossflow

Had a mechanic come out to the house today for my bad idle issue. Compression tested good 125 across all 4 cylinders. He checked spark and it was good as well. He was convinced it is a fuel delivery issue. We get good suction from the carb throats when trying to check them out. I tried spraying fuel into the carb throats but no change. also swapped carbs, no change. We pulled one of the intakes off and found a bad gasket, put back together but still had the issue with the cylinder. I pull the #3 or #4 plug and no change in idle. I am stumped

This boat runs great at WOT.

 

[tashasdaddy]

Re: only running on 1 and 2 - Help

did you use a new gasket? does pushing the key in activating the primer help? clogged low speed jets.

 

[maldoro]

Re: only running on 1 and 2 - Help

yep, I put a new gasket on. I hear the primer clicking on and it does flood out the carbs. I also soaked and rebuilt the carbs with new kits. Blew out all jets. Carbs were pretty clean, when I first pulled them off. Mechanic left and was going to come back with a diffrent intake manifold. Not sure why, I think i stumped him.

 

[crxess]

Re: only running on 1 and 2 - Help

Did you confirm spark on 3 & 4?

Good Spark, Air, Fuel, compression. If all are present it has to fire. Might not run right, but should fire.

 

[maldoro]

Re: only running on 1 and 2 - Help

We hooked up a tester to all 4 wired. Spark jump was good and nice and blue. Is it possible that the plug is not firing under a load, even though spark has been confirmed. When I saw the gasket, I was almost positive that was my issue. Looks like it was sucking air. Maybe the other side is toasted too. I will know when it stops raining.

I'm going to the keys next sunday, not sure what I would do without the boat. Really starting to freak out.

 

[maldoro]

Re: only running on 1 and 2 - Help

Should I suspect the powerpack? I'm out out of ideas, I asked the mechanic to check that stuff but he was convinced it was not the problem. Very reputable guy with 30 years in the bus.

 

[maldoro]

Re: only running on 1 and 2 - Help

Changed the other intake gasket. It is staying running at idle now but still running rough. I still pull the #3 and #4 wire and thier is no change. If I pull #1 and #2, motor shuts down. As I stated before i swapped the coils and no change. Would my powerpack cause this? Boat runs great when doing speed laps.

 

[jonesg]

Re: only running on 1 and 2 - Help

You are contradicting yourself here, tested all 4 plugs and they all spark good.
Pulled 2 sparkplug wires and it made no difference. say wha?

This is not possible. Did the spark jump 7/16th inch gap?
It must jump that big gap, not a sparkplug gap.

Did you test the shift interrupt switch?
If it sticks it will knock out one side.

Other than that you need to put a peak meter on the primary coil wires and see if the PP is sending the pulse to the coil.
Examine coils for cracks, swap coils around, swap coil wires.

 

[maldoro]

Re: only running on 1 and 2 - Help

Yes, spark jump has been verified. What is weird is that I can disconnect the coil wires coming from the powerpack and thier is no change to the way the engine is running. I have swapped coils and no change. I do not have the proper meter to test pulses. If I can disconnect those leads and have no results wouldn't that pint to the powerpack?

 

[maldoro]

Re: only running on 1 and 2 - Help

any thoughts?

 

[maldoro]

Re: only running on 1 and 2 - Help

i ordered a powerpack and a OIS sensor. We shall see

 

[maldoro]

Re: only running on 1 and 2 - Help

Ok, Spoke to the mechanic and told him what i have done so far. He is now thinking it may be the OIS sensor. He is coming back out on Wednesday which give me only a couple of more days to deal with this before I leave for the keys. Can it be anything else that I can have him check. I don't mind buying parts and having them on hand. My vacation will suck bigtime, if we don't have a boat.