Cylinder 2 and 3 commons??

[gearhead07]

Long story short trying to show off a 2 step to a girl turned around and got me.

STORY: Around 5500-6000RPM in second gear, after launching, POP,POP BOOM! lost a lot of power. And tach started jumping all over the place. It happened before, copper plugs so I figured they may have fouled out. So I babied it to the shop.

Pulled the plugs and sure enough they where fouled.
When plugs where out I looked in the cylinders with a bore scope. 1 and 4 had a lot of sludge in there and 2 and 3 where spot less.
Did a compretion test just in case. Had 150-180 across the board.
Sprayed in cleaner in to cylinders and cranked over with no plugs or fuel injectors conected.

Put in new plugs started up, idled perfect for about a minute. Then I gave it a quick rev. Then put put put, fouled them out again. Pulled plugs found 2 and 3 fouled out. 1 and 4 still look new.

So what so 2 and 3 have in common that would cause just them to foul??? The only thing I can think of is the coil. BUT I do find it funny that the coil went bad just like that cause I was beating it.

I tested the coils across the terminals and both have about 13k ohms.

 

[boost97gst]

Well, just like most electronics, they break over under high load. That could be what happened. I would replace the coils and go from there. I think youve answered your own question really. Unless youve got 2 injectors that just happened to be malfunctioning in cyl 1 and 4, unlikely...

 

[CerebralAilment]

A good rule of thumb is you don't want more than 10psi drop across the board for a solid healthy engine..

 

[gearhead07]

Yhea I just wanted to know if there is anything I'm not thinking of because I find it weird that its just happened all of a sudden

 

[CerebralAilment]

Hmm coils?

 

[omega260]

Im a newbie so take what I say lightly, but have you checked your IC pipes? I know this happened to my evo buddy a bunch of times under boost. Popped the uicp pipe off.

 

[boost97gst]

Im a newbie so take what I say lightly, but have you checked your IC pipes? I know this happened to my evo buddy a bunch of times under boost. Popped the uicp pipe off.

A boost leak would lead to a very rich condition under load causing equal carbon deposits/unburnt fuel in all 4 cylinders. Hes got a bad set of coils.

 

[gearhead07]

Yhea I did check my pipes before anything first because Yhea I've had that happen before and like said that would cause all cylinders to run rich

 

[bryanwheat]

These cars use a waste spark system. 1 and 4 fire from the same coil, and 2and 3 fire from the same coil. IF you are having problems with 2 and 3 than i would do a resistance check on the 2-3 coil pack.

 

[gearhead07]

Ok thanks guys I feel more confident about my guess on coils. So I guess ill maybe look into ordering some msd coils, maybe?

 

[bryanwheat]

Ok thanks guys I feel more confident about my guess on coils. So I guess ill maybe look into ordering some msd coils, maybe?

No, don't get msd coils. The stock coils are more than you could possibly need. Before buying anything take a multimeter and test the coils.

 

[gearhead07]

I have tested both of them and both coil packs are about 13k ohms. How else should I test it?

 

[bryanwheat]

I have tested both of them and both coil packs are about 13k ohms. How else should I test it?

IF they test right than the coil is in spec. Check the plugs for proper blue spark one by one.

 

[gearhead07]

The wires are a couple moths old and plugs I just changed cause they fouled out. But its only 3 and 4.

 

[bryanwheat]

What does the spark look like on those plugs?

 

[gearhead07]

Welp I did check for spark on all cylinders all looked fine. Checked cam timing, nothing found. Eventually after messing with it for awhile I found the plug on the ICM came loose. Pushed it back on and now it runs fine.

Thanks guys

 

[ed1380]

I'd say 2-3 coil but because the tach started jumping I'd say it's the transistor.

 

[muddfisher85]

What plugs are you running? I run 2 degree colder ngk plugs. Because that is what the ngk rep I talked to runs in his dsm and I kept blowing the tips off mine some how. Seems to have fixed my issues maybe it would help you too. Have you checked your ecu by chance? I had a bad ecu make my car fowl plugs in a matter of minutes because it was just dumping fuel in.