idle surging problem on startup

[lukep]

Hey, new to these forums, when searching for issues related to my Jeep, I kept finding these forums, so I figure this is the place to be.

Anyways...

Within the last couple days, whenever I start my 94 Grand Cherokee (laredo) for the first time in the morning, the idle will surge between 1000 and 2000 RPM's, slowly, several times over the course of about 2-3 minutes, almost like i'm pumping slowly on the gas pedal, but i'm not.

After it does this for a few minutes, it will almost die (dropping to less than 500 RPM's), but then it will recover and then idle smoothly, with no more issues, and I can drive it fine.

I have researched this quite a bit and am thinking it could be the Idle Air Control Valve or maybe the IAC Moter as well.

Any thoughts or ideas on this? thanks!

[Dsilver]

That sounds good man, both of those things could be it, but talk to Dale Appelli, he is pretty knowledgeable about Jeep problems.

[Dale Aeppli]

Originally Posted by lukep

Hey, new to these forums, when searching for issues related to my Jeep, I kept finding these forums, so I figure this is the place to be.

Anyways...

Within the last couple days, whenever I start my 94 Grand Cherokee (laredo) for the first time in the morning, the idle will surge between 1000 and 2000 RPM's, slowly, several times over the course of about 2-3 minutes, almost like i'm pumping slowly on the gas pedal, but i'm not.

After it does this for a few minutes, it will almost die (dropping to less than 500 RPM's), but then it will recover and then idle smoothly, with no more issues, and I can drive it fine.

I have researched this quite a bit and am thinking it could be the Idle Air Control Valve or maybe the IAC Moter as well.

Any thoughts or ideas on this? thanks!

HI YOU'RE ON THE RIGHT TRACK IN THE THROTTLE BODY YOU;LL SEE A SLOT ON THE SIDE OF THE THROTTLEBODY TOWARDS THE VALVE COVER GET A SPRAY CAN OF THROTTLEBODY CLEANER START THE JEEP HOLD ON HIGH IDLE USING THE LITTLE RED STAW THAT IS ON CAN. SPRAY THE SLOT THOURTHLY THE MORE YOU CLEAN IT THE BETTER DON'T SPRAY ANY OF THE SENSORS OR THE PLASTIC CONNECTORS AS YOU'LL RUIN THEM SPRAY THE BUTTERFLY,THE SIDES OF THROTTLE BODY & THE BUTTERFLY SHAFT WHERE IT GOES THRU THROTTLE BODY DON'T SPARE THE CLEANER AND YOU SHOULD BE OK DALE
[email protected] HOPE THIS HELPS

[Dsilver]

Dale sure knows his Jeep stuff.

[lukep]

thanks! i'll try that out this weekend and see what happens

[Dsilver]

Good luck with your repairs.

[leowolf]

Just wanted to thank dale, i had the same problem with my 93 grand cherokee yesterday (5.2L) I went down to k-mart after reading this forum and got a can of carb cleaner and popped the air duct off the valve body. started the car and shot liberal amounts to the back of the body, and around the inside of the butterflyes. The idle calmed down and this morning she started up and ran at 700 rpm until warm, then throttled back to a cool 500rpm. thanks Dale!

[lukep]

yeah, just an update here, same thing as leowolf for me. sprayed a lot 'o cleaner into the valve body, really settled down my idle probs. awsome.

[leowolf]

Problem came back in a week, I replaced the Idle Contol Vavle on the back of valve body. i havent had troubles since. (3 weeks)

[Cappie86]

My 93 GC did this same thing for the first time today and then the check engine light came on. I started it as usual and the rpm's went right up to like 2000 and then fluctuated. Ran fine but the check engine light really bugs me.