LOOKINFORSPL? Posted February 25, 2014 Report Share Posted February 25, 2014 Good morning, any help with this would be much appreciated. first off im driving a 1998 gmc envoy(jimmy) 4x4, with a 4.3 liter iirc. the issue im having is while driving or sitting at idle the RPM goes all over the place, at this point the truck runs like shit. then the next minute the RPM drops to zero and the truck runs fine. I am unable to have the obd checked because i was told there was no power going to the port connection. any help with this issue would be greatly appreciated. Link to comment Share on other sites More sharing options...
deathcards Posted February 27, 2014 Report Share Posted February 27, 2014 sounds like a loose wire i could be wrong though what have you checked examples fuel filter air filter injectors fuel pressure skar sk2500.1 0 gauge power and ground kunukonceptz alpine HUvxi65 components on BA gt-275new build log -> http://www.stevemeadedesigns.com/board/topic/150642-project-d-kon-deathcards-build-log/#entry2148821 2 x-15 sundowns singer alt, odyssey bat, and maxwell ultra caps Link to comment Share on other sites More sharing options...
FuriousG Posted February 28, 2014 Report Share Posted February 28, 2014 First off DTC's and history data would be helpful. You likely have an open fuse in the IP fuse block, cigar ltr fuse should be 15A...feeds the DLC. If the change from running terrible to normal is a quick transition, good chance your EGR is acting up. Will usually be quite difficult to keep running at idle, but the more throttle you give it the better it will seem. Without scan data it's a crap shoot, as there's a plethora of things that could cause your issue, throw a new fuse in and get DTC's checked. Link to comment Share on other sites More sharing options...
truthsayer Posted February 28, 2014 Report Share Posted February 28, 2014 could be a couple of things, throttle positioning censor, o2 censor or even a vacum leak. But odds are it;s the throttle body censor. truthsayer Link to comment Share on other sites More sharing options...
hazestorm23 Posted February 28, 2014 Report Share Posted February 28, 2014 Good morning, any help with this would be much appreciated. first off im driving a 1998 gmc envoy(jimmy) 4x4, with a 4.3 liter iirc. the issue im having is while driving or sitting at idle the RPM goes all over the place, at this point the truck runs like shit. then the next minute the RPM drops to zero and the truck runs fine. I am unable to have the obd checked because i was told there was no power going to the port connection. any help with this issue would be greatly appreciated. check the cam and crank shaft sensors I had this problem before in my car. Could be misfiring Link to comment Share on other sites More sharing options...
ParDeus Posted February 28, 2014 Report Share Posted February 28, 2014 Vacuum leak, egr. Link to comment Share on other sites More sharing options...
LOOKINFORSPL? Posted March 3, 2014 Author Report Share Posted March 3, 2014 thanks to everyone for the help in resolving this issue Link to comment Share on other sites More sharing options...
bcpballer64 Posted March 4, 2014 Report Share Posted March 4, 2014 Having had a 96 with the 4.3 id look to a vaccuum leak. I had simular issues and started looking at my vaccum lines and most were dry rotted open "The strongest reason for people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." -- (Thomas Jefferson) Link to comment Share on other sites More sharing options...
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