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Prev Professional Automotive Repair Technical Discussions for June 26, 2013
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Open Help Requests for GM
Help Request Answers
2004 Cadillac SRX 3.6L clunking VIN: 1GYDE63784
makes a loud popping noise when you turn or under a heavy load. when you hold the brake and accelerate then slowly letting go of the brake it makes the noise. i took the transfer case apart everything looks good it did have mild metal particals. but the chain ...
1967 Chevrolet Impala 5.3L don't know VIN: N0TAVA1LBL
Trying to help out a good customer with this old ride. After collapsing the four piston calipers and doing a standard brake job there is no pedal. We centered the combination valve and proceeded to bleed, but cannot get a pedal. We thought the brake lines may ...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16R8X
This vehicle came in for a no start, I check for spark at coil spark ok, check for spark at plugs spark ok. Check for fuel pressure 65psi and 60 cranking. Check for injector pulse, pulse ok and power feed wire ok. Check vacuum while cranking has some vacuum. R...
2002 Chevrolet Express 3500 5.7L Misfire VIN: 1GBJG31R32
Hey guys i have p0300 then codes for misfire cylinders 5,7 8 i pulled plugs all black carbon compression in 5,7 go to 150 then after it leaks right to 0 trying to get at 8 now any suggestions? thank you Trouble codes: 300 (Mifire)
2003 Chevrolet Silverado 1500 5.3L door switches VIN: 1GCEK19TX3
Left door module is totally inop: no locks, windows, mirror control. Replaced twice with salvage yard units. Noticed that these have a microprocessor below the switches, and am wondering if this needs to be VIN flashed to the truck...Have power and ground to t...
2001 GMC Sonoma SLS 4.3L MIL Lamp on, Mystery Misfire VIN: 1GTDT13W11
First the history. Lower intake lets go, customer takes to a friend who does the job, who does it right, changes the oil, takes it for a spin, now it has a crank sensor code, after the second sensor we get it. Take it out, it is scratched by the reluctor. We g... Trouble codes: P0300 (Misfire detected), P0304 (Misfire cyl 4)
1999 Pontiac Grand Prix SE 3.8L fuel pump VIN: 1G2WJ52K4X
This is a tough one. my headache started when I tried to help a friend who thinks he is a tech,anyway my friend replaced the fuel pump with the updated connector, also replaced fuel pump relay, the bcm, the pcm to no avail. also my scanner will power on but wi...
2003 Pontiac Grand Am GT 3.4L Misfire VIN: 1G2NV52E23
Misfire from all cylinders under light load, 2100-2500 rpm Did basic checks of ignition system, plugs/wires - good Swapped: ICM, EGR, 7X CKP, CMP, 24X CKP Unplugged: TPS, MAF, EGR, 24X CKP *Problem goes away with EGR and 24X CKP unplugged* Dropped exha...
2006 Pontiac Solstice 2.4L Engine VIN: 1G2MB33B26
Did a water pump replacement on this Soltice. Coolant was leaking from it quite profusely, and had a whine type noise in that area. We bought the tool that holds the balance shaft gear in place, and purchased a Delco pump from the local GM dealership. Replacem...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Eldorado ESC 4.6L Coolant VIN: 1G6EL12Y8W
Thanks for the time you all took to reply. A couple said to check or clean out the radiator. I found a reciept from another shop in the glove box for a recent new radiator so I didn't check that. 95% said it was a head gasket problem caused by the aluminum ...
2007 Chevrolet Tahoe LTZ 5.3L Misfire, MIL Lamp on VIN: 1GNFK13007
Wow 32 replies!! Sorry for the late reply. Customer needed vehicle back shortly after original post and has decided that after the two top engine cleanings we performed, he is happy enough to drive as is until it gets worse. Misfire is still counting up on ... Trouble codes: P0300 (Random cylinder misfire).
2005 GMC Envoy SLE 4.2L passenger front window VIN: 1GKDT13S15
Thank you for the replies I received, Matthew fronm California was rigght on with the programming problem, there is a programming issue with some of these models that must be flashed the old way. Problem is you wont know until you try, problem with that is it ...
2007 GMC Sierra 2500 HD SLT 6.6L MIL Lamp on, black smoke VIN: 1GTHK29677
The Oring on the charge pipe in front of the intake was ripped causing a boost leak. And the EGR valve was stuck open a tiny bit causing my MAF readings to be low (31 g/s at idle egr off @ operating temp). I dont like the design of this EGR valve since it is a... Trouble codes: P0101, P0401, P0299.
2002 Oldsmobile Bravada 4.2L Misfire, MIL Lamp on VIN: 1GHDT13S32
So I am going to have to close this one with out a good fix. In response to replies so far; I never personally was able to get this thing to misfire in my time with it. There is some kind of event that happens that I never experienced. I did scrutinize the thr... Trouble codes: P0300 (Random/multiple misfire).
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