I had to replace the fuel pump 3 months ago, about a month later the service light came on. I knew I was overdue for a tune up so I replaced plugs cap and rotor. the truck ran fine for about a week then it developed a misfire. I brought it to a local shop that I have went to for years, they read the codes and found a misfire and told I should replace the wires they did and this didn't fix the problem so they said I need new fuel injectors at a cost of $1300 on top of the $326 already racked up. If it helps cold engine runs fine, only misfires when warm and I don't know if the fuel pump is for pre 1996 models that use a lower fuel pressure, HELP ME PLEASE! I need my truck oh the milage is 71,000
If it were low fuel pressure misfire , it wouldn't be cylinder specific misfire #2 , 4 it would be P0300 random misfire . I would think fuel injector's too . When hot they could be breaking down electrically , more resistance . If they tested electrically with a lab scope they would know for sure . Misfire from sticking fuel injector no fuel misfire
SOURCE: 02 GMC Sierra 4.3 V6 P1345
Well that sounds like a tough one , But here is a site worth checking out . Several mechanics use this it to help out people like your self that are frustrated and are getting P #$%$# off ! Good luck
http://www.obd-codes.com/forums/search.php?search_id=active_topics
SOURCE: engine won't idle,
ok code 32 is the EGR (exhaust gas recirculation) this does not mean that the EGR valve is bad right off, check it and see if it is stuck in the open position, remove the vacuum line see if it moves, it should not. It is supposed to open at highway speed to recirculate exhaust gases and burn them, if the valve is stuck open the engine will not idle because it upsets the air mixture too much, if you remove the valve and see its open, then replace it.
SOURCE: check engine light comes on
could be low fluid levels to emissions 02 sensor or when the vehicle is on a slant the fluid levels such as oil etc brake fluid are reading below normal and simply need attention such as correct fluid specification levels or as i stated a tune up
SOURCE: 2000 gmc jimmy 4.3L misfire on cyl 4 and cyl 5 at
Clean the egr valve which would cause rough ideling and misfire........Hope this helps u out.
260 views
Usually answered in minutes!
×