1G Slight power sputter

[enriquez2000]

Heres the symptom... car drives fine and pulls hard. When i am idling there is a sputter/misfire every so often. Its not consistent and usually will happen right after breaking at a light one time then go away.

Logic tells me spark.. i am not leaning or richening during the event. Changed plugs with no help. Ngk wires are not too old and coils ohm out at the top of spec(would like to see them at the bottom)

Fuel pressure on the gauge seems to be fine when it sits and idles during the event.

So i am keaning towards power transistor but want a sanity check before i drop money on a new one.

 

[jakk220]

Its not consistent and usually will happen right after breaking at a light one time then go away.

This makes me think that its IAC related. Have you tested / calibrated the IAC or cleaned it lately?

 

[enriquez2000]

This makes me think that its IAC related. Have you tested / calibrated the IAC or cleaned it lately?

No.. i did replace it with a used one a while back.. i can ohm it out again. Last time it failed it got stuck at like 60 on link and stumbled hard and almost stalling. Ill ohm test it in the morning.. maybe its just on its way out

 

[jakk220]

No.. i did replace it with a used one a while back.. i can ohm it out again. Last time it failed it got stuck at like 60 on link and stumbled hard and almost stalling. Ill ohm test it in the morning.. maybe its just on its way out

It is possible. Always best to check the obvious first.

 

[enriquez2000]

It is possible. Always best to check the obvious first.

I agree.. took that for granted so i will for sure. If its bad ill get a new one instead of off of parts cars

 

[enriquez2000]

Isc coils testing good
Coil packs test good

Im not sure other than transistor what else it could be.