Last post on Mar 20, 2012 at 6:34 AM
You are in the GMC Envoy
What is this discussion about?
GMC Envoy, Engine
#22 of 31 2002 Envoy Loss of oil pressure at idle
Dec 11, 2011 (8:25 am)
I own a 2002 Envoy and have been having idle issues for a few years now. 2 years ago I replaced the plugs with OEM and cleaned the throttle body and the idle seemed to get better but has been really bad for the last year or so. In the past week the oil pressure has become an issue at idle. The pressure is good until the engine gets to normal operating temp. I have noticed that if I keep the idle around 900 rpm the pressure is good but currently the idle is around 600 rpm. I sat in the car and studied the pattern of the low pressure warning. At idle with AC on idle at 600rpm the engine is idling rough but idling then feels like the engine stalls momentarly and the pressure drops the 5-10psi for 1-2 seconds the "Check Gauges" light comes on and "Stop Engine" shows in the display. Then the idle recovers and the pressure is normal(40-42psi) With the AC on this happends every 5-6 seconds, with AC off every 10-12 seconds. I have been reading this forum about this issue so this week I had the engine flushed professionally and the oil changed. After the oil change still having issue. Yesterday I removed and cleaned the Camshaft Actuator Solenoid and Throttle Body and yes I had the battery disconnected for over 30minutes while I cleaned both. I still have the issue!!! The next thing I am going to check is the oil pressure sending unit and have another oil pressure gauge hooked up to see if the pressure is really dropping. Can anyone help with this issue?? Any suggestions?? Thank You in advance for any replies.
#23 of 31 sputtering and lost power
Jan 29, 2012 (8:11 am)
I was dring my 2007 Envoy, pulled over to switch drivers got back in and started to go when we lost power and the car started sputtering. Had to shut it off and then re-start. Anyone know what is wrong? Has never done this before. Check engine light is on now too. Thanks
#24 of 31 Re: sputtering and lost power [thetwirp]
Jan 30, 2012 (9:07 am)
I'm sorry that your Envoy is not doing so well at the moment. If you were interested in working with a dealership, please be sure to let us know as we'd like to be available to assist.
GM Customer Service
#26 of 31 2003 GMC Envoy Starting Problem
Feb 02, 2012 (11:19 am)
We have a 2003 GMC Envoy that is hard to start. It takes 2 or 3 times to start. Once it runs, it usually starts fine within a hour after stopping but not always. We've taken it to PEP BOYS and our local GMC Dealership for diagnostics, they can't find anything wrong . . . and of course it seems to start fine for them after we leave it. I even took a video of my wife trying to start the car 3X in a row and showed it to the service mgr. so he could see what it was (not) doing. Still no luck.
We get home and next day.... it takes 2 or 3 cranks to get it to start. I even asked the service mgr if they'd: check fuel line pressure(s), computer modules, etc. We even had the fuel filter changed... it still doesn't start w/o 2 or 3 tries. Any thoughts? Buy a Ford? We like our Envoy but we're afraid there's an underlying issue that will cause stalling or not starting when we're in the middle of nowhere. Please Help! Thanks!
#27 of 31 Re: 2003 GMC Envoy Starting Problem [agendavid]
Feb 06, 2012 (7:15 pm)
UPDATE: Took Envoy to an independent garage after getting no where with the GMC service at the dealer. Explained the situation to the shop owner and asked about fuel pressure. He said that would be the first thing he'd check based on the age of vehicle & my description of the problem.
Got a call about 2 hours later and he said my fuel line was losing all pressure after they had the engine sit. So we replaced fuel pump. Total cost for parts & labor was $794.
Finally got the issue fixed. Yeah.... a bit costly but it now works. I might've saved a hundred bucks or so if I ordered part online but there's cost & then there's convenience. We needed this fixed ASAP so we paid the bill.
#28 of 31 Re: GMC 2004 Envoy stalling [heiden]
Mar 19, 2012 (2:12 pm)
my envoy is giveing me the same problem only if i disconect the A/C evap can it runs fine. the only time it gives me a stalling / rough idle is when the A/C kicks in. im just woundering if you may have any new information as to what is going on with yours since it sounds similar. the oil pressure issue you have with it going up and down is due to you idle changing so rapidly i belive we have the same isssue any sugestions you have or found out would be helpful please E-mail me at youngbuck1015yahoo.com
#29 of 31 Re: GMC 2004 Envoy stalling [grant84]
by Stever@Edmunds HOST
Mar 19, 2012 (6:30 pm)
Please don't ask for "personal" help via email. We all benefit when a problem is discussed on the open forum. Thanks.
#30 of 31 Re: GMC 2004 Envoy stalling [grant84]
Mar 20, 2012 (6:26 am)
The issue I have with the idle and stalling happens whit the AC running and wothout the AC running. I am still experiencing this issue and dont think I will ever resolve it.... I have cleaned the throttle body and done the reset procedure, replaced the plugs with OEM part, replaced fuel filter and no luck.
As for the low oil pressure , that was fixed by replacing the pressure sensor located near the oil filter. Good Luck!
#31 of 31 Re: GMC 2004 Envoy stalling [grant84]
Mar 20, 2012 (6:34 am)
We took our Envoy to a local independent garage because the GMC Dealership service was ineffective (they put it on the machine and found nothing). So I took it to a popular indy garage and explained to the owner what the problem was. He said the first thing he would do is run a fuel pressure test to see if the fuel pressure would stay constant. Said it would take about hour or so to do that. Turns out that the fuel pressure would drop and continue to drop. RECOMMENDED ACTION: Replace Fuel Pump.
Cost including labor: $800 approx +/- with OEM parts.
The owner told me that fuel pressure is a likely culprit considering the age of the vehicle. I had previously had the fuel filter replaced and the fuel line inspected at PEP Boys so it seemed reasonable to consider the fuel pump issue. After the Fuel Pump replacement, the Envoy starts up as if new and has been running fine. You may be able to find a less expensive fuel pump online and get a mechanic to install it for you. But we needed this fixed ASAP as my wife uses the Envoy for her sales rep job and if we had any issues we wanted to be able to bring it back under the 90 day shop guarantee.
Hope this helps!