Bad Idle Hunt And Slight Miss

[Sr PWR]

hey guys

recently my car has been acting a little funny, I had my car tunned a few months back with a gt3071 740cc power fc etc ec, then decided to rebuild after the tune (stupid i know) this consisted of a port job different compression forges etc etc. Now to the problem, after the engine was rebuild it was sweet never missed a beat sometimes it use to stall if you were in 4th and chucked it in netural but after about 4000kms the car totally changed. I get very bad idle hunt most of the time when i hit the lights ranging from 300 (about to stall) to 1500. and it takes a a good minute to find its true idle. Also now and then the car gets a slight miss just on normal driving and sometimes when you get up it in 1st gear it misses abit.

Ive hardly ever got up it since the rebuild as i want to get it tunned once i get new cams and gears, but these problems are worrying me, any advice would be most appreciated.. This is on a sr20det by the way..

thank you

[The Mafia]

do you run a AFM Powerfc and atmospheric BOV?

[GeeTR]

This is on a sr20det by the way..

Theres the issue right there. Maybe u snapped a swing.. sorry "rocker" Maybe the tractor timing chain rattled itself off hahaha *chuckles* jk - cant help myself

Start with cleaning your idle control valve, and removing your atmo bov if present, till you can tune around it.

EDIT You've done 4000kms and haven't loaded it yet? Who suggested that run in program - Hrrrrmmk

Nice 4/5 in your avatar

Edited February 10, 2008 by GeeTR

[Sr PWR]

yea good one GeeTR get a life, theres more to performance than just a rb engine..

the engine is running a power fc with a z32afm and a PLumb back GFB bov.

[Sr PWR]

hmmm??

[The Mafia]

have you looked for vaccuum leaks?

Does the IAC valve need cleaning?

[rob82]

How far is the AFM from the turbo and is there any bends in that pipe?

[Sr PWR]

them mafia im giong to be cleaning my icv on wednesday

the afm is a fair distance frmo the turbo and has a few bends 2 of them being 90 degree, im guessing you go through matty spry to say that

Also does anyone have any idea how to check for sensor errors on the pfc handset as a few people told me you can check it??

thanks for your help guys most greatfull.

[rob82]

them mafia im giong to be cleaning my icv on wednesday

the afm is a fair distance frmo the turbo and has a few bends 2 of them being 90 degree, im guessing you go through matty spry to say that

Also does anyone have any idea how to check for sensor errors on the pfc handset as a few people told me you can check it??

thanks for your help guys most greatfull.

Definately dont go throught MAtt Spry but I do know that big AFM's on SR's can cause reversion issues.

The ICV isn't going to cause a missfire.