Storm Trooper

iTrader: (11)

My 98 z28 has been surging badly and randomly reving up, mostly when it first turns on but sometimes even when im driving, I am not sure what this could be. The coolant temp. sensor was put on because it didnt have one before and right when it was put on the problem started. Has anyone ever heard or had this problem before?

youngrigo

Vacume leak

neutron82

iTrader: (26)

ses light on??... what codes are being thrown??

brian_rs/ss

it needs more cowbell.

txh0tb0i972

iTrader: (63)

LMAO

1sicklsx

iTrader: (1)

check everything that was touched when the sensor was installed, could be a bad sensor, why was thre no sensor in the first place?

Storm Trooper

iTrader: (11)

ses lights been on for a while since I put the headers on, last time i checked the codes thats were being thrown were the o2 sensors (from the new headers) and the coolant temp sensor was messed up, changed it, and the problem started

Mikes99SS

iTrader: (1)

Sounds like O2 sensors are bad. My 99 SS did the exact same thing when one of the sensor went bad.

neutron82

iTrader: (26)

front o2 sensors yes, rears no... he said he has o2 codes from the header install which are more than likely the rears, so that won't create a driveability issue... the coolant temp sensor can cause problems... did you clear the codes and do an idle relearn after you put the new sensor on?... if not, i would do that and go from there

Storm Trooper

iTrader: (11)

I got the codes cleared and it idles fine now when i turn it on.. But when im driving the car surges and it bucks. Sometimes when I stop the rpms go up to about 2000 and back down and back up over and over.

chrysler kid

iTrader: (14)

my 98 formula did that for a while after i had the sensor replaced. i think the computer is just trying to figure out if the sensor is actually working again. mine stopped doing that after like 3 or 4 days on its own

John98LS1

iTrader: (6)

IAC sensor is probably what's causing your issue. check it out

Storm Trooper

iTrader: (11)

I took the sensor off and its running perfectly fine now, has something to do with that, either the sensor is messed up, wiring could be messed up, or the computer needs to get used to the new sensor.

FasTimeSS

iTrader: (47)

chances are the computer needs to get used to the new sensor

John98LS1

iTrader: (6)

clear the comp and turn the car on and it should work just fine within 30 seconds.

good luck

TXMaro

iTrader: (13)

Check the temp sensor connector for corrosion.. I fought my 5.3 truck tooth and nail for forever before I found a corroded temp sensor plug that was causing similar issues.