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Prev Professional Automotive Repair Technical Discussions for August 23, 2005
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L1R
Hi guys This ones got me.I have a crank but no run car with a code p1629.I have batt voltage at terminals a1 a2 and b2. I have grounds at terminals b5 and b6 of the theft module. With module disconnected I have 5 volts at terminal a3. With the module connected... Trouble codes: P1629
1994 Cadillac Seville STS 4.6L head bolt serts VIN: 1G6KY529XR
upon reinstaling the rear head, one of the time sert repair holes begins to pull out and will not tourque. is there anything that can be done to save this block. all other head bolts tourqued down fine. looking for any help i can get
1994 Cadillac Seville STS 4.6L Stall, MIL Lamp on VIN: 1G6KY529XR
Customers symtoms, engine light on, traction disabled, a/c flicks off and on rapidly, (charge ok) stalls, speedo not working, noticed radio clock display flicker.I noticed the scanner doesn't communicate data. I have checked through aldata and archieves and I ... Trouble codes: 1034, 1052, T073 (current pulse width modulation fault), T072 (serial link fault)
1995 Cadillac Seville STS 4.6L Cuts out, Stall VIN: 1G6KY5294S
Customer complains of vehicle loses power and is going to an idle. Info monitor is saying engine temperature is too high and computer is apparently commanding engine to idle. Customer says it always does it when engine is hot, but not necessarily at full opera... Trouble codes: P0073 (Intermittent ECT sensor signal), P0095 (Engine stall detected)
2000 Cadillac Escalade 5.7L power door locks VIN: 1GYEK63R8Y
Hi Guys Doors will lock from door switches but no unlock. Works okay from keyless remote. Mitchell diagram shows a "door lock inversion module" and supposed to be "behind left side of dash" but I can't seem to find it. Does anyone know where it is? Thanks.
1985 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1770786F
Ok lets get started. This is a friends wifes car. Motor was rebuilt this year. From what I have been told it ran fine for awhile thin started to miss and stall. I get and this is ths list of new parts that were on it, New cap, and rotor. 8 new fuel injectors. ...
1986 Chevrolet S10 2.5L Poor Idle Quality, Misfire VIN: 1GCCT14E5G
This truck runs great when warm. It misses when first started cold and will not go over 50 mph till engie has reached about 180. Wacthing spark and the single injector, they both, at the same time, will skip the pulse at the same time. Integrator will go down ...
1986 Chevrolet Camaro Z28 Iroc-Z 5.0L cooling system VIN: 1G1FP87H2G
see if anyone can help or had similar problems, 1986 z28 5.0 carb., running hot at idle ( 240-250 ) or running at highway speeds, has a brand new jasper longblock, water pump, thermostat, intake, hoses, belts, temp switch for cooling fan, radiator. the cooling...
1991 Chevrolet Lumina Euro 3.1L Noise VIN: 2G1WN54T2M
This car came into our shop with a very noisy fuel pump, buzzing it's little brains out. You could hear the car coming up the street. Pressure, volume and supply voltage were, surprisingly, OK. I did not check voltage drop across the pump, amps draw or scope p...
1997 Chevrolet C2500 Suburban LS 7.4L Misfire, MIL Lamp on VIN: 3GNGC26J3V
Suburban came in with code 305 missfire #5 clyinder about 4weeks ago. The ignition parts on it had never been replaced since it had left the factory. We replaced plugs cap,rotor and ignition wires and fuel filter. The Suburban returned with the same code po305... Trouble codes: 305 (cly. 5 missfire)
1997 Chevrolet S10 2.2L 1-2 Shift Late and rough VIN: 1GCCS144XV
Vehicle came in over 4 months ago with no second gear. Pulled apart and found 2nd and 3rd clutches a little burned and worn down. Customer now decided to have us rebuild it. When I reassembled it, I could not find the two accumulator springs that normally go...
1998 Chevrolet Blazer 4.3L warning lights VIN: 1GNDT13W0W
Ths may get long- I have been working on it awhile. Customer concern of ABS and brake warning lights came on.-Actually they come on after about 2 seconds of brake application- first the ABS light, then the BLW light. If brake pedal stays pressed for 2-3 second...
1999 Chevrolet C1500 Suburban 5.7L starter VIN: 1GNEC16R6X
this vehicle when first sarted in the morning will exibit a "drag" for the first couple of revolutions and then free up and have no problem starting as many times as you wish afterward. it's not until you let it sit for about 3 or 4 minutes that it may or may ...
2002 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J72
We bought and resold this car. After selling check eng. light came on. The code was P0133 downstream 02 sensor. Put the car in the air and see that the converter had been changed. When replaceing the 02 I see that it was damaged like someone had hit it. Thinki...
1999 GMC Sierra 1500 SL 4.8L Anti-Theft VIN: 1GTEK19V5X
This truck was towed in as a no start. Vehicle will start and then immediatly stall. The security light stays on. There is no communication with any computer data. Checked DLC power and grounds fine. Fuel pressure is fine.Fuses ok. I believe the Ign switch and...
2003 Hummer H2 6.0L compressor ? VIN: 5GRGN23U23
Good day to all, Customer concern was a lack of air conditioning cooling ability at idle. I connected gauges and at idle the low side pressure was aprox. 65-70 psi, high side was 350 plus. Upon inspection the condenser was found to be plugged with grass seeds...
1989 Oldsmobile Delta 88 Royale 3.8L Noise VIN: 1G3HN54C3K
Our customer brought this car in for noise in the engine.The noise sounds like you are shaking marbles in a can.This engine is the 3800"c".The noise is real loud in the bell housing area. With a stethoscope with the end off of it and listening while moving the...
1992 Oldsmobile 88 Royale 3.8L Excessive Emissions, Cuts out, Stall VIN: 1G3HN53L3N
This Olds is just a little troublesome for me. It keeps running rich and stalling its self after about 3-5 minutes from cold start. I checked fuel pressure, injector resistance, pulled the o2 sensor to open up the exaust. So far everything looks good. No codes...
1991 Pontiac Bonneville SE 3.8L interior door lights VIN: 1G24X53L5N
Have this 91 Pontiac boneville with a battery draw. We replaced the power window motor due to being inop. Before we put the door panel on I cked the function of door lock latch, seems to work fine and door lights come on and off with the delay. But somtimes th...
1997 Pontiac Grand Prix GTP 3.8L Poor Idle Quality, MIL Lamp on, extreme high idle VIN: 1G2WP5219V
please help someone. I have this 97 pontiac grand prix with a 3.8 supercharged. The history of the problem is about a year ago the car was in here for a high idle problem and code p0507. at the time I diagnosed the problem coming to the conclusion that the int... Trouble codes: P0507
1997 Pontiac Trans Sport 3.4L No Start VIN: 1GMDX03E3V
no injector pulse, no spark. checked all crank cam signals; replaced ignition module, still no start. customer brought van in last week because of a no start problem, but it ran fine for us. they then towed it back in and we have been unable to start it since.
2000 Pontiac Grand Am GT 3.4L No Start, Cuts out, Stall VIN: 1G2NV12EXY
Hi guys, this car is not giving us much to go on. The customer states that the vehicle will die while driving down the road. Customer said If you let it sit it will restart. The problem occures very intermittent. It has good fuel pressure in its range, spark i...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L cylinder VIN: 1G4HP52K8W
you guys are on it! the cure was the intake manifold,a reply from robert in iowa was the advice i took,with the throttle body removed i applied pressure to the cooling system,with two thumbs over exposed passeges you could watch the coolant leaking out of the ...
2002 Buick Rendezvous CX 3.4L abs system VIN: 3G5DB003E2
thanks for the help found lf wheel sensor had low amplitude out of the sensor.would not go over 1.5 volts ac on my meter.
2002 Cadillac Escalade 6.0L turn signals VIN: 1GYEK63N32
I sorry to say we couldn't get to the bottom of this one.The used car lot that owned the truck took it to the local GM dealer-I called yesterday and was told that they could not repair either???-I now find out that the truck is still under factory warranty and...
1991 Chevrolet Corsica LT 3.1L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 1G1LT54T6L
hello thanks for your help it was useful but was still stunt couldnt find answers.then stop and look on my scanner and seen o2 not switching found grounded. when i started it was working fine.so thank you for the your help. sincerely juan
1993 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Idle Quality, Surge, MIL Lamp on VIN: 1GNDT13W8P
You guys were right on the money on this one. The fuel presure regulator was leaking. Replaced the injector assembly. Cleared codes and test drove. Runs great. Thanks you guys. Trouble codes: 45 (rich exhaust).
1994 Chevrolet Corsica 3.1L unknown VIN: 1GILD55M6R
I wish I had something useful to share: we have not fixed the problem and are not likely to do so, soon anyway. When the customer found out it may be a costly problem to pursue, he declined further eval. I received a number of great thoughts, some we hadn't th...
1998 Chevrolet Astro 4.3L Hesitation, Stall VIN: 1GNDM19W4W
Most replies pointed at the pump. I agree O.E. is the only way to go. Vehicle came in with new aftermarket pump, that the customer had bought. So here we are,Pump #3=O.E.Delco, same pressure 55psi at idle. Same problem. Out of 26 replies, 3 mentioned the EGR a... Trouble codes: P0171 (lean snsr 1 bnk 1), P0174 (lean snsr 1 bnk 2), P0507 (iac system - rpm too high).
1999 Chevrolet Express 3500 5.7L horn VIN: 1GCHG35R2X
Repaired van by providing new ground across steering u joint used 6 inch of 16 guauge wire stripped both ends back and attached by two small hose clamps / works well no interference problems . Thanks For everyones post -Dan [...]
2000 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEK19TOY
I finally got the truck in. We put a fuel pressure regulator on, even though we saw nothing wrong with the old one. It fixed the problem and the customer is happy. Lost our ass on this one. Thanks to everyone who said to replace the pressure regulator.
2005 Chevrolet Silverado 1500 4.8L Hesitation, Misfire VIN: 2GCEC19V75
Hello fellow techs, Thankyou for all the replies; suggestions ranged from bad gas to ignition breakdown to intake leaks. Also, it was suggested that the owner should just ditch the truck and purchase another popular asian brand vehicle.As this truck has unde...
2005 Hummer H2 6.0L no compressor engagement VIN: 5GRGN23U25
The problem I was having was no ground from the PCM to energize the a/c clutch relay. System had 2 pressure sensors. The low pressure sensor had no voltage that came from a/c control head. Sent back to dealer under warranty
1998 Oldsmobile Aurora 4.0L Lighting VIN: 1G3GR62C2W
I took out the new light control module, installed a new wire end from an old turn signal switch through the male plug to the module. I made a tighter mechanical connection at the new spliced wire to circuit board connection, then slid the plug over my spliced...
1984 Pontiac Firebird Trans Am 5.0L Surge, Cuts out, Stall, Misfire VIN: 1G2AW87H1E
This vehicle is fixed. It was the distributor. I received several replies telling me to look for a magnitized shaft and sure enough. Care has ran fine for more than a week. Thank to all that responded
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