Low Load Missfire

[moonus]

nah im jus saying that he mite have fried his pump n all the shit mite have accumulated n f*ked up his cat, hence the rough idle

[700HP-GTR33]

Your TPS needs changing by what I have read on other threads(throttle position sensor)

This I believe is located on the Throttle body.

Cheers

[mad082]

how would the cat affect it?

update: i got home this arvo (been driving with the o2 sensor unplugged) and plugged the o2 sensor back in. seemed to run fine. then the aircon switched off, and it ran slightly crappy. turned aircon back on and ran fine. watching the gauge it runs leaner with the aircon on, and richer with the aircon off. so i'm thinking it may be fouled plugs, or possible the idle control, but i'm open to other suggestions.

Edited October 19, 2006 by mad082

[mad082]

Your TPS needs changing by what I have read on other threads(throttle position sensor)

This I believe is located on the Throttle body.

been there, done that, got the tee shirt. thanks anyway.

[700HP-GTR33]

Did you say you cleaned your Afm's..........did you open them up and re-soldered the joins?

Just curious........what colour is the shirt?

[mad082]

Did you say you cleaned your Afm's..........did you open them up and re-soldered the joins?

Just curious........what colour is the shirt?

yes.......... yes.

thats ok........ blue

Edited October 19, 2006 by mad082

[700HP-GTR33]

Could it be your Cable going to the throttle body...loose or worn spring inside?

Is your pedal tight?

Let me guess....checked that tooo

Would annoy me too.....blue is such a shit colour

[mad082]

i don't think it is the throttle cable. the reason is that i can sit there and it won't do it. then it might do it for a second then it will go away. or it will hunt so bad it stalls the car.

i'm giong to clean the AAc valve again. last time i had this sort of issue it was the cause, but it had slightly different symptoms. it would hunt, but the idle would sometimes sit at 600, other times 1500.

[Oblivion]

i know it is digging a bit, but this morning my car a had a slight missfire for about 5 secs on really low acceleration. No boost prob still running - pressure in the manifold. The car had warmed up or was close to it, and it is the first time it has done it. It has not done it since, only that short time.

Just wondering MAD082 if you found out your problem? or if anyone knows anything new.

[mad082]

i ended up altering the tps, putting a new fuel filter in, cleaning the afm, changing back to my old o2 sensor, got rid of some vaccum leaks.......

i think that was all, and yes it did go away. i think the vaccum leak was the main cause. it was the breather hose on top of the rocker cover, and also the seal around the pcv valve that i found to be leaking.

[WazR32GTSt]

how did you end up checking for vaccum leaks?

my car has had a miss at idle for almost 4 years and i haven't found a fix

i have always thought of an idle leak but my main suspicion right now is the alternator's ability to stabilise voltage...

[mad082]

i was looking round the engine bay and saw the split hose. just lucky.

[Oblivion]

ok. gives me something to work on. ta.