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Spark problems after car is started

natoe

Well-known member
Joined
May 15, 2007
Messages
66
Location
Corvallis OR
I've been having troubles figuring out what is up with the galant and finally broke down to make a new thread about it.

The car starts, eventually idles fine, but when I try to rev it at all it will first stumble and then rev to about 2000ish and then cut spark and fall back to idle. If I hold the throttle open it will continually bounce from idle to 2000ish and I can smell fuel (like its cutting spark but not fuel).

I have a known good ECU in the car (with the basic chip goodies) and just tried a good power transistor with no avail.

Any ideas? Could it be the coilpack? I didn't think it would be since it idles fine off throttle.


Thanks for any help!
 

Terry Posten

Well-known member
Joined
Dec 16, 2003
Messages
9,009
Location
Davenport, Iowa USA
Kind of sounds like a bad MAS/MAS wiring. The ECU has gone into "limp home" mode.

Is the check engine light on?
 

natoe

Well-known member
Joined
May 15, 2007
Messages
66
Location
Corvallis OR
No check engine light, if I unplug the MAF then it revs up without cutting out. I checked the MAF wiring and cleaned up my connections (the car came with it cut and labeled).

I am kind of suspicious of the MAF as well, but before it got parked due to a bad ecu it wasn't giving me problems.
 

natoe

Well-known member
Joined
May 15, 2007
Messages
66
Location
Corvallis OR
hmm I will look into that, its all plugged in correct but it may be bad.

I put a 2G maf in place and the spark problem went away, I didnt try driving it though because the chip was for larger injectors. However, it seems that this would mean it is the maf or maf wiring thats causing it..
 

natoe

Well-known member
Joined
May 15, 2007
Messages
66
Location
Corvallis OR
still trying to figure this out...

what should happen if the temp sensor is unplugged? that way i can figure out if mine is acting normal or not.
 
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