# Fits and Starts with Idle Control Valve (ICV) **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, valves, suburban\ **Created:** [October 6, 2009, 12:51am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670 "2009-10-06T00:51:36Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 6, 2009, 12:51am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/1 "2009-10-06T00:51:36Z")
I have a 1990 Chevy Suburban 1500, 350, automatic, throttle body, with 287,000 miles. I replaced the Idle Control Valve when I lost idle RPM, and it ran like a champ for about two weeks. Then, one day, it cut out on me at 65 mph, and started acting like the fuel filter was blocked. I changed the fuel filter, to no avail. Still acting like it has “bad gas” or water in the gas. Usually it dies when I am pulling into a parking space,or sometimes after stopping for stop lights. Any suggestions? ---
**Author:** ![bimmerman](https://avatars.discourse-cdn.com/v4/letter/b/b9e5f3/32.png) [@bimmerman](https://community.cartalk.com/u/bimmerman)\ **Post date:** [October 6, 2009, 1:32am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/2 "2009-10-06T01:32:49Z")
could be vacum leak, you could try putting it nuetural when coming to a stop to see if it dies on, you or keeps running. a bad maf, or throttle position sensor could cause to die. ---
**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\ **Post date:** [October 6, 2009, 2:35am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/3 "2009-10-06T02:35:21Z")
Did you clean the throttle body too? ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 6, 2009, 11:53pm UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/4 "2009-10-06T23:53:34Z")
Thanks for the prompt response. My 1990 Suburban does not have a MAF sensor, but does have a MAP sensor. Found one vacuum leak and fixed it, but still having problems. I will check out the throttle position sensor. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 6, 2009, 11:55pm UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/5 "2009-10-06T23:55:05Z")
Thanks for the prompt response. Yes, I did clean the throttle body, but still having problems. ---
**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\ **Post date:** [October 7, 2009, 3:55am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/6 "2009-10-07T03:55:11Z")
Try changing the ignition module. Check the ignition pickup in the distributor. If you don’t have any of these parts, there could be an ignition problem. Price a new or reconditioned engine control module (computer), especially if it resembles an aluminum box with transistors inside it. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 7, 2009, 4:39am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/7 "2009-10-07T04:39:10Z")
Thanks for the prompt response. I have tried that yet, but will try tomorrow. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 7, 2009, 5:18am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/8 "2009-10-07T05:18:28Z")
I have not tried that yet. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 8, 2009, 5:09pm UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/9 "2009-10-08T17:09:16Z")
Have not been able to check ignition module. Crappy weather. Hopefully tomorrow. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 22, 2009, 12:41am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/10 "2009-10-22T00:41:07Z")
I have also replaced the O2 sensor. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 22, 2009, 12:41am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/11 "2009-10-22T00:41:31Z")
I have also replaced the O2 sensor. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [October 22, 2009, 12:56am UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/12 "2009-10-22T00:56:08Z")
I have also replaced the O2 sensor. ---
**Author:** ![SantaClaus](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@SantaClaus](https://community.cartalk.com/u/SantaClaus)\ **Post date:** [April 19, 2010, 3:08pm UTC](https://community.cartalk.com/t/fits-and-starts-with-idle-control-valve-icv/37670/13 "2010-04-19T15:08:01Z")
Hello Everyone, After going though all my magic tricks, and all the helpful suggestions from all you wonderful people here on Car Talk, I finally broke down and took the suburban in, and paid for a diagnostics exam. It turns out that both PROM chips were bad, and the ECM computer chip was also bad. So here are the part numbers: PROM chip DEL 16060836 $ 71.76 PROM chip DEL 16139566 $123.05 ECM computer EC EM7747 $212.60 I hope this will help anyone else that is having similar problems.