bad idle once a day

[dhop11]

just had a new intake manifold gasket and egr valve installed and ever since when i go out in the morning a cold morning here lately thats been all of our mornings the jeep v8 318 engine will turnover and try to crank but doesnt unless i give it the gas with the pedal then i pat the peadal for a couple of minutes and it will idle low but not cut off this is what i dont understand after i get to work about 6 miles from home it sets there in the cold all day 12 hrs when i get ready to go home 29 degrees out side the jeep been there all day and starts and idles fine??

[Dale Aeppli]

Originally Posted by dhop11

just had a new intake manifold gasket and egr valve installed and ever since when i go out in the morning a cold morning here lately thats been all of our mornings the jeep v8 318 engine will turnover and try to crank but doesnt unless i give it the gas with the pedal then i pat the peadal for a couple of minutes and it will idle low but not cut off this is what i dont understand after i get to work about 6 miles from home it sets there in the cold all day 12 hrs when i get ready to go home 29 degrees out side the jeep been there all day and starts and idles fine??

What year is the jeep? Try turning the key on and wait 15-30 seconds this will let fuel pump prime the fuel rail. If you haven't cleaned the throttlebody lately, the air idle control valve maybe in need of cleaning. Since it does this after a over the night stand, the fuel pressure regulator may be leaking pressure back to tank. dale
[email protected]

[dhop11]

94 jeep grand cherokee ill try the last suggestions

[dhop11]

tried the 15- 30 seconds but no go any other suggestions oh yea also cleaned throttle body seem to run better but still wont stay running without me having foot on the gas..

[Dale Aeppli]

Originally Posted by dhop11

tried the 15- 30 seconds but no go any other suggestions oh yea also cleaned throttle body seem to run better but still wont stay running without me having foot on the gas..

hi, it sounds like you mave have a bad air idle control valve, this is the sensor on the back of throttlebody, where the slot is inside the throttlsbody bore. dale [email protected]

[dhop11]

took the jeep back to the shop and everymorning it started fine no idleing problem brought it home and here it happened to me again will not run when cold on certain days i have to pat the gas to keep it running for about 3 minutes and it will then run fine aftyer that and all day long even if i let it set for for a while in cold temp 28 degress it still starts fine..??

[dksob81]

dhop11 - I had the same problem in my 94 5.2L, not every morning but about 60% of the time, I would start the jeep and it would die immediately after starting. if I held the gas pedal for about a minute (RPMs around 1500) it would stay running and run fine, also a couple times right after starting up and holding the gas pedal in for a few seconds I would let off the gas start driving then when I come to a stop it died (this only happened like 3 or 4 times) it slowly got worse to the point it would either die everyday after cold start or would start then idle real low then high and low for about 20 seconds before it would finally settle down. Well I replaced my IAC valve (got it from autozone WELLS brand) and it didn't help so for about 2 weeks it continued doing this - I read in a past post about someone replaced the IAC then the PCM and then the IAAC again before it cured his problem, so I decided I would buy another IAC different brand different store, well I forgot it had a warranty on it so I took it back got a new one and installed it, it's been a week now and I have not had a problem with it starting yet.

hope my story helps

[GunsnRoses88]

dksob... uve heard my past idle problems... and ive been too lazy to do anything about it and the past few days it has started back up except now it isn't just a one time thing when i start and turn the wheel all the way... yesterday even after driving for a while it shuddered almost everytime i turned the wheel fully,,, still the IAC?

[dksob81]

GnR - does this only happen when idling and turning the wheel or while pressing the gas pedal and turning?

[GunsnRoses88]

only occurs when:

idling
+
turning the wheel

[dksob81]

Yea I would still say it's a bad IAC then.

[dhop11]

mine only does this in morning setting still warming up for run to work

[GunsnRoses88]

mine used to only do it in the mornign when it was cold and it was sitting warming up and then id back up and back out of the driveway and switch into drive and then a really bad shudder and off it went

[GunsnRoses88]

turned off this morning