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Big problem

xaisomboun

Well-known member
Joined
Jun 19, 2011
Messages
117
Location
Minnesota
I was driving home last night from working experiencing my tachometer jumping all over the place. Im thinking this would be a misfire so I went home and swapped out power transisters/coilpacks.

That didnt work so I plugged the old ones back in and now this is where the horror begins.

The car BARELY starts and when it does, I have to give it a little gas, but even then it sounds like its running HORRIBLY.

I checked all my plugs and they seem to be in good shape, bpr6es ngk with new ngk wires just replaced so it cant be that.. could it?

Almost like its firing off 1 piston only..

So I thought to myself "Hey, why not check the ECU cause you've been putting that off since forever."

So I did.

Heres what came about.



Looks like minor acid damage?



I dont even know wtf all this crap is.. can someone explain??



And of course, non-eprom -_-

Im thinking this could be the cause, does anyone else have any input?

UPDATE: Changed the plugs, still doing the same thing.. Found out cylinders 2 and 3 arent firing at all.
 
Last edited:

holeshotmoe

Well-known member
Joined
Apr 7, 2005
Messages
1,282
Location
MD
Looks like omeone repaired acid damaged board (and replaced caps). If the acid wasn't cleaned up and continues to etch the runs, the situation could deteriorate such as you're experiencing. (that's a non-eprom by the way) It would be quickest if you could swap in a known-good ecu. WIthout that option, I would check that the plug wires didn't come off the coil. [A thought: I can't recall, but I think there is something in the coil pack or power transister (can't recall that name either) that can kill two cylinders.] Check compression...a head gasket blown through between 2&3 could drastically kill power from both cylinders since when one is on compression stroke the other is on exhaust stroke (no compression).
 

xaisomboun

Well-known member
Joined
Jun 19, 2011
Messages
117
Location
Minnesota
it cant be the headgasket cause i pulled 2 & 3 and they werent sparking at all...

right now the only thing I can think of is the ecu since ive already swapped out 2 coil packs and 2 ignitors..
 

James

Well-known member
Joined
Apr 7, 2012
Messages
1,322
Location
Port richey Florida
Randomly losing 2 cyls really sounds like the igniter. But I forget what 2 cyls are on each coil.
 

xaisomboun

Well-known member
Joined
Jun 19, 2011
Messages
117
Location
Minnesota
FIXED!!! Looked at the wiring harness coming from the ignitor and it looked like someone did a hack job that didnt last too long.
 

mitsuturbo

Well-known member
Joined
Jun 2, 2008
Messages
3,537
Location
Near Seattle, Washington
Quoting James:
Randomly losing 2 cyls really sounds like the igniter. But I forget what 2 cyls are on each coil.



2/3 are on one coil
1/4 are on the other

When installing plug wires, it's best to remember (from front to back) "4 1 2 3"
 
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