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Chevy Suburban Rough Idle and Stalling

95 messages,  Last post on Nov 03, 2009 at 6:57 AM

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What is this discussion about? Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Silverado 2500, Engine, SUV

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#86 of 95 Re: Stalling problem getting worse [arrie] by arrie Jul 24, 2009 (7:12 am)
Replying to: arrie (Jul 23, 2009 3:29 pm) Below link should show a picture of my '04 Tahoe fuel pressure regulator mounted on the side of the left fuel rail. It also has a vacuum control for higher fuel pressure during fast acceleration, i.e. when throttle is opened and intake manifild pressure increases.     Arrie Replies to this message: steve_ (Jul 24, 2009 8:37 am) navalavi8or (Jul 24, 2009 10:59 am)
#87 of 95 Re: Stalling problem getting worse [arrie] by pear69 Jul 24, 2009 (7:12 am)
Replying to: arrie (Jul 23, 2009 3:29 pm) On a 1999 Tahoe the Fuel pressure regulator is located under the upper intake manifold. It is not readily accessible. Also, on a 99 Tahoe there is no fuel rail. These engines have (what many reffer to as) a spider assembley, which is also located under the upper intake manifold. A lot has been re-enginiered since 1999.
#88 of 95 Re: Stalling problem getting worse [arrie] by steve_ HOST Jul 24, 2009 (8:37 am)
Replying to: arrie (Jul 24, 2009 7:12 am) Hmmm, the thumbnail is working ok Arrie but not the bigger pic. Please try reloading it on your album.
#89 of 95 Re: Stalling problem getting worse [arrie] by navalavi8or Jul 24, 2009 (10:59 am)
Replying to: arrie (Jul 24, 2009 7:12 am) I haven't been following this post but I was the originator of a post regarding the same issue several years ago. My 2001 Suburban 6.0L was totalled a little over a year ago. I just want to reiterate that the issue was easily solved with some berrymans B-12 and a rag. Remove the air tube from the aircleaner to the throttle plate. Remove the throttle plate (if you want to do a good job). Hold the throttle plate open and clean the residue. There is no idle air bypass on the 6.0L and probably other GM motors in this year/body group. The idle is completly controlled eletronically and to eliminate the Idle air bypass system the machined a very small gap between the throttle plate and the housing. Once the oil/carbon residue from the egr/crank vent gums up behind the throttle plate the idle is affected. My symptoms were stalling when the throttle plate returned to idle and the computer didn't compensate quick enough. It also gets worse as the gunk builds up. Annual cleanings will illiminate all issues. I would atl least give this a try prior to overhauling your fuel system.      Good luck Curtis
#90 of 95 04 Tahoe Fuel Pressure Reg. by arrie Jul 24, 2009 (1:06 pm)
Below link should show fuel pressure regulator of my '04 Tahoe   Click Here   Arrie Replies to this message: pear69 (Jul 24, 2009 8:24 pm)
#91 of 95 Re: 04 Tahoe Fuel Pressure Reg. [arrie] by pear69 Jul 24, 2009 (8:24 pm)
Replying to: arrie (Jul 24, 2009 1:06 pm) Boy oh Boy, I wish the regulators on the 1999 were mounted outside like that...btw nice giant picture...
#92 of 95 2009 Suburban stalling problems by usmc513 Sep 01, 2009 (8:35 pm)
Hi, I hope I'm posting this in the right area. We just bought a 2009 Suburban and have had continual stalling problems. Has anyone else experienced this or have any idea what is causing it? Thanks Replies to this message: desertsuburban (Oct 16, 2009 7:43 pm) kiawah (Oct 17, 2009 5:26 am)
#93 of 95 Re: 2009 Suburban stalling problems [usmc513] by desertsuburban Oct 16, 2009 (7:43 pm)
Replying to: usmc513 (Sep 01, 2009 8:35 pm) Help!!   I have been trying to find a blog or forum where this problem can be addressed. I also have the same problem with my 2009 Suburban LTZ. I bought it in March and it has stalled/stopped about 5 times now. I'm taking it to the dealer so they can look at it. Hopefully the problem can be resolved quickly. Thanks, DS Replies to this message: kiawah (Oct 17, 2009 5:26 am)
#94 of 95 Re: 2009 Suburban stalling problems [desertsuburban] by kiawah Oct 17, 2009 (5:26 am)
Replying to: desertsuburban (Oct 16, 2009 7:43 pm) Just take it to the dealership. That's what the warranty is for. Don't waste your time trying to research or fix this yourself when you have a free warranty to handle it.
#95 of 95 97 Chevy Misfire and O2 code by kkrause44 Nov 03, 2009 (6:57 am)
hey guys, I have been reading the threads and it seems like there is some knowledge here, so this is my issue. 97 chevy silverado, 5.7L (I know this is a suburban forum but the engines are the same). I have had a rough idle here for the last year ever since I had the intake manifold gasket replaced by a mechanic because it was leaking coolant into my oil. Have also had a stumble when taking off, seems like the truck misses right once i press on the gas and then drives just fine. Just lately it has started to throw P0131 codes (O2 sensor, bank 1, pre cat). I replaced the sensor, bosch, not the universal one, no change. It then threw a p0300 code and a p0305, with the blinking SES light when driving at 25-30 mph, missing pretty badly. Looked at the plug (#5), it was black and sooty, so i swapped the cyl 5 plug with the cyl 1 plug just to see if it was the plug. Sure enough, next code was a p0301! I replaced the spark plugs with the autolite platinums, after reading the posts i now know i should have done the acdelco, but its too late now. Thank you for the advice to use acdelco, i will do that will all of my vehicles from now on. By the time I changed all of the plugs, the driver side bank of plugs (1,3,5,7) were all black and sooty while the passenger side plugs were completely normal looking. With new plugs for a week, i checked them again and sure enough, driver side plugs are sooty, passenger side are normal. Still having the rough idle and random misses, usually right on takeoff. I checked the fuel pressure at the engine and it goes to 63 psi with a turn of the key, after 2 seconds when the pump shuts off the pressure immediately jumps down to 55 psi within a second, and then bleeds down to 30 psi within 3 minutes. When it is running, fuel pressure stays constant at 54 psi, but again once when shut off it bleeds off down to 30 psi. I have read that the fuel pressure needs to stay within 5 psi for 5 minutes or there is a leaky injector or a fuel pump check valve. I am on a budget here in michigan and enjoy working on it, but don't enjoy burning money on parts that don't need to be changed. I am thinking about swapping the injector pack for the mpfi upgrade, but is there any additional diagnosis i can do to pinpoint it further. Have a new fuel filter and had a dealer do their fuel injection system cleaning right after the intake manifold was changed when they also reset the timing. However since then I have played with the timing trying to get it to stop missing after the dealer adjusted it. My dad has a scan tool that gives real time readings on all of the engine vitals, (fuel trim, o2 sensor readings, etc.) is that what i would need to set the timing? Have sprayed starting fluid around intake (while engine is cold) while running, no changes in idle. Thanks for all of your time, advice, and help on reading this long post, i just wanted to give a good background.

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