Thread: surging?

so heres whats going on, when i start my car especialy when its cold it likes to surge, sometime all the way up to 1500rpm then it will run steady for a while with a few random surges. is anyone elses having this problem? suggestions? look at my signature for mods thanks very much for any help

i have a friend who tunes my car he has tried to play around with it to figure out, since i know very little about tuning. but i did un plug the air idle controll and it idled smothly but at about 1100rm if that helps. the car has 0 vacuum leaks, that was the first thing i checked for and when it is idleing steady the vacuum gauge stays at 15 to 16in hg

Im thinking tune with the 42s is doing it. unless there is physical promblem else where.

Originally Posted by chrisb

Im thinking tune with the 42s is doing it. unless there is physical promblem else where.

i am actually running my stock injectors for the time beeing but i do have the 42.5s ready i just ahve not put them in yet sorry i should have specified.

Originally Posted by matt5112

does your friend have the ability to move the IAC valve through the steps? if so, try moving it through the steps to see if the car responds if it should. If not, its prolly the IAC.

i will have to see if we can do that later today, and if you dont mind me asking what was off in your tune that was making your car surge?

He had a vacuum leak...but your running a tune for 42.5 injectors with stock ones in there? Probably the issue jeeves.

Originally Posted by bluegtp91

He had a vacuum leak...but your running a tune for 42.5 injectors with stock ones in there? Probably the issue jeeves.

no i am running a tune for the stock injectors, i just have the 42.5s on hand and will be going in soon