# Tire-Kicking GVR4s Again \[HELP\] **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [August 13, 2008, 4:11pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030 "2008-08-13T16:11:18Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 13, 2008, 4:11pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/1 "2008-08-13T16:11:18Z")
I know, I’m the proverbial tire-kicker. But I’ve run across another GVR4 that has me really interested. It’s a '91 with 107k on it, was a 1 owner car w/ all documentation (service etc) until about 7 months ago when the current owner got it, and parked it. Runs, but won’t idle well. What are first easy/obvious things I should look at for the idle problem? Thanks, TJ ---
**Author:** ![Darkstar](https://avatars.discourse-cdn.com/v4/letter/d/b487fb/32.png) [@Darkstar](https://forums.speedlife.net/u/Darkstar)\ **Post date:** [August 13, 2008, 4:12pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/2 "2008-08-13T16:12:55Z")
i think you pretty much have to, to make everything come full circle with me and the vette edit: could be a vacuum leak, intercooler pipe fell off, or perhaps your mother is feeding again and the air in the vicinity of the intake is within the grasp of her gravitational pull. thus starving the engine of oxygen. ---
**Author:** ![ZEX350Z](https://avatars.discourse-cdn.com/v4/letter/z/87869e/32.png) [@ZEX350Z](https://forums.speedlife.net/u/ZEX350Z)\ **Post date:** [August 13, 2008, 4:25pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/3 "2008-08-13T16:25:14Z")
> [@steel roofing](https://forums.speedlife.net/t/steel-roofing/37451/7): > > i think you pretty much have to, to make everything come full circle with me and the vette > > edit: > > could be a vacuum leak, intercooler pipe fell off, or perhaps your mother is feeding again and the air in the vicinity of the intake is within the grasp of her gravitational pull. thus starving the engine of oxygen. I know this is sarcasm but a charge pipe off won’t effect idle unless there is a sensor before where it came off at ---
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 13, 2008, 7:46pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/4 "2008-08-13T19:46:50Z")
So, it actually high-idles, not rough idle. It hangs around 2.5-3k. I talked to a buddy of mine w/ a GVR4 and he said it’s almost certainly an IAC. However, the IAC can fry the e-prom in the ECU. So it could be a really, really cheap fix, or a moderately cheap fix. Made an offer and the guy is calling me tonight. -TJ ---
**Author:** ![T34418L31](https://avatars.discourse-cdn.com/v4/letter/t/e56c9b/32.png) [@T34418L31](https://forums.speedlife.net/u/T34418L31)\ **Post date:** [August 13, 2008, 8:01pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/5 "2008-08-13T20:01:49Z")
Why would a bad ISC fry an ECU? At worst, you need an ISC, 20 bucks. Easy to test with a OHM meter. Measure resistance between 1-2, 2-3, 4-5, 5-6. All should be (I think) something like ~30. 350z, DSM’s have a MAF, so any charge pipe leaking/off is a very big issue. ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [August 13, 2008, 8:03pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/6 "2008-08-13T20:03:02Z")
I’ve never heard of that situation. Idle issues are very common. I know this says surge but a lot of it is caused by the same stuff: [http://www.dsm.org/how-tos/tttt/tttt3.html](http://www.dsm.org/how-tos/tttt/tttt3.html) [http://vfaq.com/mods/wayback/BradBauer/engine/surge.html](http://vfaq.com/mods/wayback/BradBauer/engine/surge.html) ---
**Author:** ![spoolinsteve](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spoolinsteve/32/6026_2.png) [@spoolinsteve](https://forums.speedlife.net/u/spoolinsteve)\ **Post date:** [August 13, 2008, 8:06pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/7 "2008-08-13T20:06:05Z")
wat… karmen vortex! boost leaks would throw you off but i dont see how a major one can just “come” iac or vacuuuuuum line leak. you can use the biss screw to adjust the idle if you cant find anything wrong also you can use the butterfly on the idle switch side but then ud have to adjust the tps for the right ohms as well ---
**Author:** ![Darkstar](https://avatars.discourse-cdn.com/v4/letter/d/b487fb/32.png) [@Darkstar](https://forums.speedlife.net/u/Darkstar)\ **Post date:** [August 13, 2008, 11:37pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/8 "2008-08-13T23:37:57Z")
> [@Official MythBusters "PLANE on a CONVEYOR" episode PARTY!!! (12/12/07 @ 8pm)](https://forums.speedlife.net/t/official-mythbusters-plane-on-a-conveyor-episode-party-12-12-07-8pm/37453/12): > > I know this is sarcasm but a charge pipe off won’t effect idle unless there is a sensor before where it came off at 🤣 try running an open venting BOV on a DSM and tell me that a blown out charge pipe won’t affect anything. 🤣 :hsugh: ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [August 14, 2008, 8:02am UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/9 "2008-08-14T08:02:05Z")
🤣 I run 2! ---
**Author:** ![Darkstar](https://avatars.discourse-cdn.com/v4/letter/d/b487fb/32.png) [@Darkstar](https://forums.speedlife.net/u/Darkstar)\ **Post date:** [August 14, 2008, 8:21am UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/10 "2008-08-14T08:21:46Z")
:kekegay: stfu DSM noob. ---
**Author:** ![T70\_Tsi](https://avatars.discourse-cdn.com/v4/letter/t/898d66/32.png) [@T70\_Tsi](https://forums.speedlife.net/u/T70_Tsi)\ **Post date:** [August 14, 2008, 9:09am UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/11 "2008-08-14T09:09:15Z")
oh SNAP. my newbnesss ownz me. ---
**Author:** ![spoolinsteve](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spoolinsteve/32/6026_2.png) [@spoolinsteve](https://forums.speedlife.net/u/spoolinsteve)\ **Post date:** [August 14, 2008, 9:37am UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/12 "2008-08-14T09:37:25Z")
I want a gvr4 : ( its like a mini evo ---
**Author:** ![Lazylaser](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lazylaser/32/6033_2.png) [@Lazylaser](https://forums.speedlife.net/u/Lazylaser)\ **Post date:** [August 14, 2008, 2:59pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/13 "2008-08-14T14:59:37Z")
> [@Official MythBusters "PLANE on a CONVEYOR" episode PARTY!!! (12/12/07 @ 8pm)](https://forums.speedlife.net/t/official-mythbusters-plane-on-a-conveyor-episode-party-12-12-07-8pm/37453/26): > > 🤣 > > try running an open venting BOV on a DSM and tell me that a blown out charge pipe won’t affect anything. 🤣 > > :hsugh: I vent the bov to atmosphere… but converted to a 3" gm maf thats a blow thorugh (after the bov) with the stock style maf, a boost leak will cause issues. ---
**Author:** ![1320](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1320/32/5949_2.png) [@1320](https://forums.speedlife.net/u/1320)\ **Post date:** [August 14, 2008, 3:10pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/14 "2008-08-14T15:10:04Z")
> [@What you be for Halloween sucka?](https://forums.speedlife.net/t/what-you-be-for-halloween-sucka/37393/51): > > I know, I’m the proverbial tire-kicker. But I’ve run across another GVR4 that has me really interested. It’s a '91 with 107k on it, was a 1 owner car w/ all documentation (service etc) until about 7 months ago when the current owner got it, and parked it. Runs, but won’t idle well. What are first easy/obvious things I should look at for the idle problem? > > Thanks, > > TJ :nono: Seriously TJ, you need to let this DSM fantasy go. ---
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 14, 2008, 5:09pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/15 "2008-08-14T17:09:54Z")
> [@FS: 2007 Chevrolet Corvette Z06](https://forums.speedlife.net/t/fs-2007-chevrolet-corvette-z06/37466/17): > > :nono: Seriously TJ, you need to let this DSM fantasy go. Too late my friend, struck a deal at $1400. So, how do I begin my DSM friends? Are IAC/ISC whatever it’s called on a DSM available through typical parts stores still? -TJ ---
**Author:** ![spoolinsteve](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spoolinsteve/32/6026_2.png) [@spoolinsteve](https://forums.speedlife.net/u/spoolinsteve)\ **Post date:** [August 14, 2008, 5:27pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/16 "2008-08-14T17:27:50Z")
[www.vfaq.com](http://www.vfaq.com) your new bible. post pics i want to see this thing I think santa cruz is too far for me to drive out. pm me if you wish. ---
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 14, 2008, 6:31pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/17 "2008-08-14T18:31:03Z")
Pics ripped-off from his CL post: ![http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-1.jpg](http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-1.jpg) ![http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-2.jpg](http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-2.jpg) ![http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-3.jpg](http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-3.jpg) ![http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-4.jpg](http://i162.photobucket.com/albums/t252/tjZ06/GVR4/GVR4-4.jpg) -TJ ---
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 14, 2008, 6:39pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/18 "2008-08-14T18:39:21Z")
And the next (scary) question, what would a reasonable offer be for these (prices below are asking-price): 4 Fic 550cc injectors- new orings- less than 2k miles $100 Aem fuel pressure regulator- new $100 Hks VPC WITH HKS 550 CHIP AND GGC for 1G DSM in good working condition- complete system with sensors and harness. $300 EVO III 16g like new, no shaft play, DSM GT high flow manifold tapped for EGT, EVO III o2 housing- less than 2k miles - $450 It sounds like I’d need late-model cams and a FMIC to get close to 300hp w/ these parts? -TJ ---
**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\ **Post date:** [August 14, 2008, 8:42pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/19 "2008-08-14T20:42:22Z")
> [@Pinnacle](https://forums.speedlife.net/t/pinnacle/37463/2): > > Why would a bad ISC fry an ECU? [http://www.galantvr4.org/ubbthreads/showflat.php?Board=UBB2&Number=680009&page=0&fpart=1](http://www.galantvr4.org/ubbthreads/showflat.php?Board=UBB2&Number=680009&page=0&fpart=1) To answer your question. And another “good deal or not” question: [http://www.galantvr4.org/ubbthreads/showflat.php?Board=UBB1&Number=680851&page=0&fpart=1](http://www.galantvr4.org/ubbthreads/showflat.php?Board=UBB1&Number=680851&page=0&fpart=1) -TJ ---
**Author:** ![Shaggy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/shaggy/32/5945_2.png) [@Shaggy](https://forums.speedlife.net/u/Shaggy)\ **Post date:** [August 14, 2008, 9:32pm UTC](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030/20 "2008-08-14T21:32:51Z")
> [@FS: 2007 Chevrolet Corvette Z06](https://forums.speedlife.net/t/fs-2007-chevrolet-corvette-z06/37466/17): > > :nono: Seriously TJ, you need to let this DSM fantasy go. [Next page](https://forums.speedlife.net/t/tire-kicking-gvr4s-again-help/199030.md?page=2)