The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support RTM Racing
Please Support Fuel Injector Clinic

Cylinder 2 and 3 commons??

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

gearhead07

10+ Year Contributor
108
0
Jan 4, 2011
Auburn, Pennsylvania
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.
 
Last edited:
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...
 
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
 
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.
 
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.
 
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
 
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.
 
Ok thanks guys I feel more confident about my guess on coils. So I guess ill maybe look into ordering some msd coils, maybe?
 
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.
 
I have tested both of them and both coil packs are about 13k ohms. How else should I test it?
 
The wires are a couple moths old and plugs I just changed cause they fouled out. But its only 3 and 4.
 
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
 
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.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top