Rough idle/surging after LT headers install

[FOXCOUPE]

Had a set of Flowtech Headers installed about a week ago and been doing some driving around. The car will idle at about 600-700rpm for a short while then jump to about a 1000 and then settle down back to 600 for a short while and so on. Also when the engine is cold every time i come to a complete stop the idle will drop to about 400 rpm then just when u think it's gonna stall it jumps back up. Does this have anything to do with these cars needing a tune after mods or is my car just hooped.

Current mods: CAI,75mm TB, plenum, LT's, O/R H and mufflers.

 

[babeabe19]

Ive got the same problem since the day i put them in. i also get P0135 and p0155 codes. it hasnt done it since i uppd the timing on my predator tuner.

 

[ADRENLN]

i would think you need some sort of tuning

 

[nyuk98gt]

FOXCOUPE:

Yes, tuning is required in this case. The O2 sensors take a little longer to warm up with LTs and this can be addressed in a tune.

HTH,

Chris

 

[mity2]

mine did the same thing after i installed LT. CEL come on now and then. and funny idle. But after about month or so, i think ECU recalibrated stuff, and i have no probrem now(knock on wood)

 

[FOXCOUPE]

Thanx guys. I got the same response on another board and looks like tunning is nedded. I'll wait for the cams and then i'll the car dyno tunned.

 

[babeabe19]

mine did the same thing after i installed LT. CEL come on now and then. and funny idle. But after about month or so, i think ECU recalibrated stuff, and i have no probrem now(knock on wood)

mine did that too when i first got them but a month after that, it started doin that again untill i bumped my timing. btw are the po135 and p0155 codes im getting from the front o2s or the rear?

 

[mity2]

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