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Prev Professional Automotive Repair Technical Discussions for March 30, 2009
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Open Help Requests for GM
Help Request Answers
1999 Buick Regal LS 3.8L Poor Fuel Economy, MIL Lamp on VIN: 2G4WB52K3X
Vehicle came in with mil light on. Initially it had a code for a mass air flow sensor code. Upon inspection of the sensor data it showed that the sensor was reading 3.88 gm/s at idle which is off from the minimum of 4 gm/s. Sensor was replaced and vehicle was ... Trouble codes: P0171
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1999 Buick Century Custom 3.1L No Start
Im just about to my limit on this car, about 2 weeks ago vehicle came in for driveability concern, poor idle when hot, found clogged pcv and leaking vacuum tubes, one from pcv to intake to purge solenoid and the other from rear valve cover to intake tube. anyw... Trouble codes: 1631 (passlock password incorrect)
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2000 Buick Park Avenue Ultra 3.8L fuel gauge VIN: 1G4CU5216Y
Hi Guys, This vehicle came in with an inop fuel gauge. We tested the wiring to fuel pump. Have current at the purple wire and ground. We thought it must be the fuel pump assembly. We plugged in a new one and there was no difference. Gauge still reading full a...
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2007 Buick LaCrosse CXS 3.6L pressure hose VIN: MJJKMN2307
GM guys or someone with knowledge on quick connect fittings. i have a 2007 buick lacrosse thats out of warranty and came in to the shop with a power steering high pressure hose blown out from the pump. this hose is a so-called quick connect hose that snaps int...
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1991 Cadillac DeVille 4.9L Misfire VIN: 1G6CD53B4M
Vehicle came in with complaint of loss of power and poor mileage. Customer already had plugs, wires, cap and rotor replaced elsewhere. I found that every other cylinder is misfiring. #'s 8,3,5, and 2. Data looks good for a car running this bad. Every other cyl...
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1992 Cadillac DeVille 4.9L Excessive Emissions, Poor Fuel Economy VIN: 1G6CD53B2N
car came in on the hook and customer said it had a fuel leak. after looking at the car it is leaking fuel out of the exhaust pipe connection. I pulled the fuel rail and pressured up the system and no leaking injectors. I did a fuel pressure drop test and ohmed...
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1994 Cadillac Eldorado 4.6L blower motor VIN: 1G6EL12Y7R
i need schooling on this system. i looked on alldata to understand the system. if you notice there are three wires on the fan. a power, a ground, and themiddle wire is a control from the control head in the car. i have 12 volts on the control wire when the fan...
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1995 Cadillac DeVille 4.9L No Start, Stall VIN: 1G6KD52B7S
Voltage drop test ground from battery neg to motor and body with head lamp .003.Added ground to distributor. Only stalled and no start once on me.At that time I never lost voltage to distributor and had no ref or est. Drop test grounds to pcm (4 pins)no drop. ... Trouble codes: P0053
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1999 Cadillac DeVille 4.6L content theft deterent VIN: 1G6KD544XX
Good day people. I have this 1999 Caddy DeVille that intermittedly the CTD (Content Theft Deterent) system goes off. The horn will sound and the lights flash. This can happen a few times in one day or once a month. It has even happenend when the client shut of...
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1988 Chevrolet P30 Step-Van 7.4L master cyl VIN: 1GBKP37W8J
this is a motor home with 4 whell disc brakes.motor home came in with no brakes.replaced front and rear calipers and front hoses.still no pedal.found that wrong master cyl had been put on before.put right master cyl on. now do not no which brake line is for fr...
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1997 Chevrolet Blazer 4.3L fuse#10 VIN: 1GNDTELW34
Im hoping you techs out there ran into this problem before.I checked the fuses and found fuse #10 blown ecm/ign blown.Now I replaced it several times and it keeps blowing.Im just hoping to find a quick fix before I get any deeper into the wiring.Customer reall...
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1998 Chevrolet C1500 Cheyenne 5.0L Misfire, MIL Lamp on VIN: 1GY3T46M2X
Ok Techs..we need some help Its not a customers vehicle...its the boss's vehicle So we might be looking for work soon if we cant get right:) It needed a intake manifold gasket..but somehow we did not properly mark the distributor/rotor when we pulled it. Got t... Trouble codes: P1345 (Crank/Cam sensor), P0301
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2001 Chevrolet Camaro 3.8L Reduced Power VIN: 2G1FP22K81
This car comes from a friend in the business(parts), he has had it to several shops that were closer to him than we are and at best the problem was resolved for short periods of time. I think it just cleared itself for those short periods, have seen it do that... Trouble codes: P1518 (Loss of serial data between PCM and TAC module/Reduced Power Mode)
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2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GNDT13542
This vehicle was brought over last week. It had a P0133 code, PO171, PO030, PO013. This week it came and I decided to check again and these codes were completely gone. Now these are the codes I have now, BO17 passenger front loop open. U1000 class 2 serial com... Trouble codes: B0017, U, 1000 (Class 2 serial comm problem)
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1999 GMC Sierra 1500 SL 5.3L differential VIN: 1GTEK19T2X
I have this 99 Sierra 1500 4x4, the problem is that when the 4 wheel drive is engaged it acts as if the front differential is binding. The tires are a matched set and the front and rear ratios are correct. All cv joints look and feel fine. I have even replaced...
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1997 Oldsmobile Aurora 4.0L Pass Key Fault VIN: 1G3GR62C7V
Help!! I'm having trouble reasoning out this intermittent Pass Key Problem!! Very intermittently, this car will display "Pass Key Fault" on the drivers display, and NOT turn on the "Security" light!?! On one instance, it would not restart after shutting off. D...
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1997 Pontiac Grand Am SE 3.1L Poor Idle Quality VIN: 1G2NE52M4V
Occasional very rough idle when engine is warmed up and shifted into park, engine will start to idle rough (engine speed will jump up and down between 400-1500 rpm until it is shifted out of Park. This never happens when engine is cold. TB is clean, IAC clean,...
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2000 Pontiac Grand Am SE 3.4L antitheft VIN: 1G2NF52E5Y
i have this pont diving me nuts. custumer says car will not start but when it gets to shop car always starts. have returning codes b2960 and u1000 loss of class 2 comm. car back in shop today and stars right up. have had meter on pass wires but does not act up...
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Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Park Avenue 3.8L starter VIN: 1G4CW5316N
Thanks all for the information-i did have my reference voltage and key resistance in all postions at the module-finally located a module online{gmpartsdirect.com} plugged in and all was right again. thanks again randy
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2001 Buick Century Limited 3.1L Hesitation, Misfire VIN: 2G4WY55J01
Thanks to all 26 that replied to my help message. It's been 4 days and the car is still running fine. Some different responses, but the cause of the hesitation / miss was a partially plugged converter. (I haven't run into a plugged converter in a while, so ... Trouble codes: P0405 (EGR sensor low), P0463 (Fuel level sensor circuit high / open), P1189 (Oil pressure switch circuit), P0300 (Random Miss).
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2002 Cadillac DeVille DHS 4.6L tcc siloniod VIN: 1G6KE57Y12
Thanks to all who replieded to my tech help request. The tsb 04-07-30-034 was the info i needed. Seals were definitely bad. Went ahead and also replaced tourque converter and input speed sensor also known for going bad.Also seals not available individually any...
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1995 Chevrolet Camaro Z28 5.7L wipers VIN: 2Q1FP22P9S
Hey, Thanks for the Help!!! I was initially suspicious of the ground, but it had no connection to the brake light circuits, so I dismissed that idea. But your OVERWHELMING suspicion made me rethink my wayward path, and I looked at the grounds. No excessive vol...
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1996 Chevrolet C2500 Cheyenne 6.5L Hesitation, Poor Fuel Economy, MIL Lamp on VIN: 2GCFC29S4T
Well after weeks of this thing sitting around the customer has decided to sell the truck as is without fixing a thing.Not real sure what hes thinking but he dosent want to put a new injection pump on the truck.Which is whats wrong with it after doing the testi... Trouble codes: P1216, P1217, P1214.
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2001 Chevrolet Silverado 1500 4.3L Surge, Cuts out, Stall VIN: 2GCEC19WX1
Many replies to check fuel pump wiring and distributor for wear but had already done this. A couple of replies suggested to check ignition coil and while I was there I found the white/black wire to the coil barely holding on. This wire comes from the ignition ...
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2002 Chevrolet Camaro 3.8L MIL Lamp on VIN: 2G1FP22K92
Thanks to everybody who responded. I had replaced upper plenum gasket. Accidently the upper plenum gasket was damaged by previes repairs. Trouble codes: P0171, P0174 (Systen too lean bank2).
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2003 Chevrolet Silverado 3500 6.6L MIL Lamp on, VIN: 1GCJK33143
Come to find out. This vehicle was bought used from a dealership in which the vehicle had a chip installed at the dealer. He moved out of town and after a few months truck started to smoke. New dealer wont warranty the suspect fuel injectors because it has ... Trouble codes: P0234.
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2004 Chevrolet Silverado 1500 5.3L 2-3 shift VIN: 2GCEK19T74
Thank you very much for responding, Apparently the code P0741b was debris in the 3 4 solenoid because I removed the solenoid and cleaned it out and the code did not reappear after reassembly. Although, the transmission continued to slip, I dissembled the tran...
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1995 GMC C6000 Topkick C6H042 6.0L Poor Idle Quality, Cuts out, Poor Fuel Economy VIN: 1GDJ6H1P9S
after talking with customer i found that truck had rolled and the cab and some of the wiring harnesses were replaced and after that the comp would die every 6-8 weeks thanks a lot to Todd [...] for allowing me to use his manuals after an exhausting wi...
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1998 GMC C3500 Sierra SL 7.4L Excessive Emissions, MIL Lamp on VIN: 1GDKC34J8W
sorry about the length of time but i found that it had a bad pcm finally replaced it after testing everything all works perfect now Trouble codes: P0131 (p0133-), P0133 (p0137-), P0137 (p0151-), P0151 (p0157-), P0157 (p0175-), P0175.
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2003 GMC C4500 Topkick C4C042 6.6L Mechanical VIN: 1GDE4E11X3
Turns out after talking to a GM tech that had a similar problem and he had replaced a lot of parts. His last part he replaced was the sending unit in the front tank. I took the unit off and used a hose in the tank, primed the system and let sit over night with...
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