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Buick Regal, Sedan
#3490 of 3508 Engine stumbling. Possible bad egr valve?
Jan 28, 2011 (9:21 am)
I have a 1999 Buick Regal LS with 108k miles. About a week ago, when coming to a stoplight, after hard acceleration, the engine started stumbling, with rpm's jumping down. After about 30 seconds of this the CEL came on. Ran car 20 seconds more and symptoms disappeared.
I had the code read at AutoZone, which indicated a fouled EGR valve. Took it to the shop. They said they'd need to run diagnostics at $89. Fine. They come back say the EGR is "clean as a whistle", that there was probably some carbon in the EGR valve that didn't allow a proper vacuum seal, and that it passed through. Everything fine they say.
Today, same symptoms. Slowing down after moderate acceleration (in a hurry) the engine started stumbling a bit, like it may die. Happened for 45 seconds again, then cleared up. So question is, more carbon in EGR valve...or something else? I did put some Gumout cleaning solution in gas tank a couple weeks before this happened, could this have loosened up some gunk? Thanks.
#3491 of 3508 Re: Engine stumbling. Possible bad egr valve? [jipster]
Jan 28, 2011 (9:36 am)
My car gave occasional symptoms of a really bad idle coming to stoplights. A little gas sped up the motor enough to smooth it out and the symptoms were gone. Happened a couple months later. Then a week later. I tried cleaning the EGR valve pintle. Didn't help.
Then I cleaned the interior of the valve where the gases go in using a small brush and a liquid cleaner. I may have used gasoline or mineral spirits. Do not turn valve upside down so that solvent runs into the part that has the motors that move things. I soaked it sitting in a small bowl of the stuff to soak the interior.
But I kept brushing using a plastic bristle brush and brass wire small brush from Harbor Freight. The rod that moves through the tight seal area inside that goes to the motors gets bound up with carbon.
If you have 3/8 inch drive tool set that is metric your can undo the two nuts. Unsnap the electric connection. And the thing lifts up. The gasket almost always is okay. Just replace same position it's in.
Thing has worked perfectly since the thorough cleaning on my 1998 leSabre with 180,000.
#3493 of 3508 Re: sdcoburn [yurakm]
Jun 15, 2011 (11:26 am)
Hello just wondering if you fixed the problem? my car is doing the samething. please let me no.Thank you.
#3494 of 3508 Re: sdcoburn [antoose1]
Jun 15, 2011 (1:02 pm)
Change the fuel pressure regulator. My pressure seemed
rock solid but it is vacuum controlled and there was apparently
a vacuum leak in the unit which caused the stalling. Once replaced,
no more stalling.
#3495 of 3508 Re: 2000 Buick Regal intermittently not starting [bobakamarv]
Jul 06, 2011 (4:35 pm)
Did you resolve your intermittent starting problem with a new battery cable, if not did you find another cause?
#3496 of 3508 Pond On Passenger Side
Jul 07, 2011 (5:15 am)
Trying to figure this out. Have water coming from out of my blower motor every time I turn my AC on. Took blower out and a small thing that looked like an evaporator but not sure. still cant figure out where all this water is coming from. I have even gone as far as putting something up underneath to catch water but it doesnt help. Everytime I turn a corner more water comes out and afraid it's going to short something out or cause some serious damage./
CAN ANYBODY HELP PLEASE!!!
#3497 of 3508 Re: Pond On Passenger Side [jimd1966]
Jul 07, 2011 (5:25 am)
Most likely problem is your drain tube for the water that condenses off the cold AC coils. There's a rubber tube that comes through the floor and is at the bottom of the firewall behind the motor. If you push something up into that tube, it most likely will let go of a flood of water that's been blocked by goop in the tube.
The rubber tube is likely 4-6 inches long and has some kind of lips that close to keep air from coming in and that keeps water from coming out until there's a bit of water in the tube. When that weight gets great enough, the lips are forced open and water comes out. It should not back up to the level of the inside of the HVAC box.
Because you directly tie the water to the case holding the AC and heater coils, that would be my primary guess.
#3498 of 3508 Re: Pond On Passenger Side [jimd1966]
Jul 07, 2011 (6:58 am)
I apologize for the water problem you are experiencing. Please keep us posted when the issue has been taken care of.
Caron, GM Customer Service
#3499 of 3508 Re: 1992 Buick Regal Stalling and Restarting problems HELP!!!! [sprint4ce]
Jul 27, 2011 (6:37 am)
i had the same problem i pulled everthing out of the car and replaced it by anyway just to be simple move the waterpump first go to fasnal to get bolts to fit the water pump holes. then replace the crankshaft position center ur car was doing exactly what mine did