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Prev Professional Automotive Repair Technical Discussions for January 18, 2008
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre Custom 3.8L fuel injection VIN: 1G4HP54C7M
This vehicle has been here several times for the same problem and each time I have no fuel injection pulse. The problem would happen for several key cycles and then would start find 20 to 30 times and then fail once again. All sensors tested good before and af...
2001 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP54K91
cah has to be out a week or so before check engine light comes on. Trouble codes: 440 (evap leak), 442 (452 - gsa cap), 452 (gsa cap)
2005 Buick Century Custom 3.1L Hesitation VIN: 2G4WS52J45
Hi guys. I have an 05 Buick Century here that when you are cruising between 50-60 and you step on the gas the vehicle will not accelerate until you give at least a third or more throttle than you have. No codes in system. The only thing i did notice is that th...
1989 Cadillac Fleetwood 4.5L air shocks VIN: 1G6CB1153K
I'm diagnosing why the rear air shocks won't pump up. How much air pressure should the pump be able to put out? This pump is topping out at about 50 psi.
1996 Chevrolet Lumina LS 3.1L Poor Idle Quality VIN: 2G1WN52M5T
Hi, all. This vehicle has an intermittant high idle. A new aftermarket IAC, then a new GM IAC were installed as the concern could not be replicated while the vehicle was in the shop. No help. The one time concern occured in the shop, I noticed that my Snap-on ...
1998 Chevrolet P30 4.3L pigtail on ignition switch VIN: 1GBHP32W1W
Good day to all. I am looking for a replacement "pigtail" for the ignition switch on this P-30 van. It has 2 plugs that overlap each other and lock into the ignition switch. They are melted beyond repair and i am hoping one of you all knows where i can buy the...
2003 Chevrolet S10 2.2L thermostat??? VIN: 1GCCS19H43
About a month ago this truck came in with a concern of no heat. The first time I checked the vehicle, I found that the engine was not coming up to temp. and only running at about 156 degrees. I verified this with a scan tool and an infared thermometer at the t...
1995 GMC K2500 Sierra SL 5.7L Poor Idle Quality, Surge, Cuts out VIN: 1GTGK24K55
Need help this one has me stumped, truck runs good in open loop when goes to closed loop it surges at idle oxy sens will climb to 1100mv, ck vac leaks and replaced tbi gasket, inspect tune up found cap terrible complete tune up done,still running badly install...
2001 GMC Sierra 2500 HD SL 8.1L MIL Lamp on, Reduced Engine Power VIN: 1GTHK23G11
I'm trying to help out a fellow tech. He has this 8.1 liter which came in with a long list of codes (some were related to throttle & some were not). He changed the items listed above and all but the P1515 codes were eliminated. If he clears the code, the truck... Trouble codes: P1515 (Commanded Actual Throttle Positions Out of Range)
2002 GMC Yukon XL 2500 SLE 6.0L glass latch ajar switch VIN: 3GKGK26U52
Hello all. I have this Yukon XL and the rear wiper is not working. Now I have checked the fuses (2 fuses, one in the IP fusebox and one underhood), switch, power, ground and all are ok. The wiper motor was replaced about 4 months ago by another tech in our sho...
1997 Oldsmobile Achieva S 2.4L No Start VIN: 1G3NL52T0V
Hi Thanks in advance for any help. This vehicle has a P1629 code and in the passlock system the codes are B1021,1026 and 1027. Over the last 6 months intermittantly it will no start, get towed in and the first visit we replaced the instrument panel cluster ...
1997 Pontiac Sunfire GT 2.4L Hesitation, Cuts out, Misfire VIN: 1G2JD12TXV
Here goes nothing, again. Little 97 Sunfire GT, 2.4 L, with a maual 5 speed. Boss' kids car. Arrgh. Started complaining of a heavy misfire after upshifting coming off the expressway. He was effectively lugging the engine and the result was a misfire that felt ...
2004 Saturn Vue Red Line 3.5L Misfire, MIL Lamp on VIN: 5GZCZ63414
came in for engine light on checked with otc scanner had codes 300,301,302,303,304,305,306 engine shakes at idle and a little less at higher rpm's checked for vacuum leaks found none stft bank 1 0.70 bank 2 0.02 check pcv valve checkout ok followed repair info... Trouble codes: 300 (random misfire)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Park Avenue Ultra 3.8L No Start VIN: 1G4CU5315P
This one IS fixed - MANY replies but none could help on this one - turned out to be a one in a million type of deal - traced crank sensor wiring back into the loom to a poor connection at a butt connector! Why was there a butt connector . . .I will never know....
1999 Buick Riviera 3.8L charging, srs, abs, acc VIN: 1G4GD2212X
I replaced the battery for try + checked voltage drop through all power and ground circuits between alt and battery. No help. After much time spent, I found 2 fractured wires inside the engine harness at the big harness connector that hangs on the firewall beh...
1978 Cadillac Seville 5.7L No Start, Cuts out, Stall
well we have this car back right now. thanks to all who responded. most said to check coolant and air temp sensor that we had checked a few time already and replaced the air temp previously. we did decide to take them out and check them again. this time we act...
1997 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC124XV
Thanks to James and Bill from Illinois The PCM is behind rht front fender well tire had rubbed a hole through it it had salt,dirt and water all over the plug.Cleaned it up and put it back together runs great. thanks to all who responed. Trouble codes: P1601 (serial communication malfunction).
1999 Chevrolet Blazer 4.3L Mechanical VIN: 1GNDT13W1X
thanks for all your help we had the heads redone,updated the fuel injection and egr and truck runs perfect. |I think that it was over revved and maybe the old original injection leaned it out, injection and intake were very carboned up.found out it stuck the ...
2000 Chevrolet Express 3500 6.5L No Start VIN: 1GCHG39F9Y
oopppps!!! this will not be easy to write. i assumed the fuel gauge was working,big mistake van was out of fuel gauge stuck on half full. i think there was enough fuel to give a proper pressure reading but was worried about flow so installed a new lift pump, n...
2001 Chevrolet Malibu 3.1L theft system?? VIN: 1G1NC52JX1
thanks to everyone who shared the knowledge of the problem with the ignition switch. fixed and gone. thank you very much.
1996 Oldsmobile Aurora 4.0L power seats, mirrors, a/c, instument panel VIN: 1G3GR62C1T
Thanks for the replies-- As it turns out, this was a big lesson in not taking anyone's word for it. I came in on this project as damage control, after being told by the first technician that all fuses in both fuse blocks were good (a usually excellent technic...
1994 Pontiac Bonneville SSE 3.8L Hesitation, Surge VIN: 1G2HZ5213R
sorry for the delay guys, this car is owned by a retierd gentleman does not get driven daily. The problem was me, iover looked 2 plugs with carbon tracking on them, (back side of engine). seems like every once in a while i need a reminder to just start over an...
2001 Pontiac Grand Prix SE 3.8L No Start, Cuts out
Thanks to everyone for there support it seemed to be a problem in the security passkey after many attempts of relearning key procedure the battery died then after a good charge it started but the security light flashes constantly...advised customer to take to ...
2002 Pontiac Montana 3.4L power sliding door VIN: 1GMDU03E42
Good Morning thanks to all who replied the fix was two fold,we did notice that the door locks did not operate when shifted in and out of park,traced circuit and found corroded lt green wire at trans range sensor.After repairing wire the automatic sliding door ...
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