high idle help needed

C

cheadder.ep82

Member +
cant sort out my problem with my gt!! i tried adjusting idle control valve cleaned it and idle on the trottle body then i even replaced it and trottle sensor. checked for air leaks cant find any! done a flash test nothing came up. it idles at 1100 or 1200 or 1300 when cold but when it warms up it can idle anywere between 1400 and 2000 nearly always 1800 when the car is warm an i turn it off and back on it starts hunting at 2000rpm to 2200rpm once or twice den stops an revs up at 1800! when im driving it wnats to drive itself an my boost gauge is readin vac on it!! heads melted need help gonna change water tep sensor think it will help???
 
Last edited:
gtadvmike

gtadvmike

Member +
I have been havin the same problem and its been the pcv valve tht snapped of on top of the rocker but under the tmic. Small peice o shit tht plays a vital part in the cars day to day running and pretty steep to get a new one ... 40 - 50 sheets ::homer:

hope this helps
 
Mark-ep91

Mark-ep91

Member +
pcv valve is on top out the engine if ya have a top mount its under it connects to a vac hose id try checking ur map sensor vacuum also it goes from the sensor on the left of the firewall to the back of ur inlet manifold
 
T

TheStarletGT

Member +
Check the vacume hoses at the back of the intake manifold, 1 may have come off. That will cause the high idle, mine was at 3000rpm before.
 
G

Gtstu

Member +
I have a GT with the exact same problem iv checked everything even changed the head gasket but still cant find the fault
 
matt walters

matt walters

Member +
when i started my v a couple days ago in the morning (-10 deg c) it ran fine for about 5 mins on idle then started revving up to 2k and dropping back to 1k and so forth,

i changed the idle control valve for another i had in the garage and it solved the problem or so i thought, was fine all that day, i then came to it yesterday morning and it did exactly the same thing even with the new icv, so ive now changed the thermostat and its been fine since,

could be this? dont know how likely but just a thought :)
 
C

cheadder.ep82

Member +
ill give it a change see wat happens!! had a prob b4 wit the temostat b4 about a year ago but didnt cause the over reving i gettin when the cars warm! never overheats
 
danb87

danb87

South East England Area Rep
i had this problem too day before my mot, an my mechanic found a vacum pipe disconnected on the back on the inlet manifold.
 
W

Wuldo

Fresh Recruit
matt i had the same problem this morning and it is down to the radiator freezing over a bit but not completely resulting in the car reving to heat up i suppose once the radiator melted it returned to normal well so far anyway
 
You must log in or register to reply here.
Top