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Prev Professional Automotive Repair Technical Discussions for May 11, 2004
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Open Help Requests for GM
Help Request Answers
1984 Buick Regal T-Type 3.8L fuel pump VIN: 1G4AK4797E
tryed unpluging fuel pump relay unpluged still blows fuse
1998 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WFS214W
vehicle came in for a no start. checked for spark and fuel. there was no fuel. checked it over and diagnosed fuel pump failure. came back a week later with engine light on and code 442. checked over and found fuel pump speed resistor rotted out. replaced. clea... Trouble codes: 442 (evap. small leak detected)
1968 Chevrolet corvette 350CID windshield wipers VIN: 194678S424
we have not been able to find diagnostic procedure for testing this system, it has cowling that covers wiper armsand has to lift out of way for wipers to operate, the wiring diagrams show all the circuits but do not describe the function, can anyone tell me th...
1990 Chevrolet Cavalier 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GH1JC84T6
Hello to all I'll start with a litle hist. on car. this car has had some problems with the cooling fan operation it will come on any time hot or cold. he has been complaining about stalling & rough running. the customer stripped 1 spark plug hole, we pulled he... Trouble codes: 33 (map voltage high)
1994 Chevrolet K3500 6.5L Runaway throttle VIN: 1GDKC34F1R
Hello, and thanks for the time to take a look at this request.. Have a request here of GM Diesels techs.. We are an All Ford Shop and are limited in our GM Diesel experience, although we have 3 of these rigs in our fleet.. Not for long though!! Here's what we...
1995 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT19W6S
customer came in for routine exhaust repair (cat back) on 12/03/2003. aprox. two days later customer returned with rattle. found broken catalyist in converter. replaced with aftermarket universal conv.customer returned in janurary with check engine light on. r... Trouble codes: P0138 (bank 1 sensor h02s)
2000 Chevrolet Express 2500 5.7L Brakes VIN: 1GCGG25R2Y
Driver states that brake pedal feel is normal, but brakes will not stop vehicle. This occurs very infrequently, once every several months. When the problem occurs, there is no braking action at all. If driver releases pedal and reapplies, brakes are normal. Ve...
2000 Chevrolet C3500 6.5L HVAC Dash Control Module VIN: 1GBJL34F6Y
HVAC control module , has failed 4 times,We have traced it to the logic module in control head quits working,not allowing a/c clutch to work.Recirc and a/c switch l.e.d. lights begin to blink when system is failing. Module will only fail with engine running,w...
2000 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W1Y
Vehicle came in as a no start, intermittant spark. ...we changed out the cap and rotor, checked the rotor plate for loosness and repaired an open in the pink wire to the coil. We now have constant spark that will light off an HEI spark tester at the coil and p...
1997 GMC K3500 Sierra SL 6.5L 4th gear VIN: 1GTHK33FXV
hello all..this truck will jump out of 4th at different speeds..as long as your foot is on the throttle pedal the truck is fine..if you let off or change grades etc. the truck jumps out of gear..when this happens the speedometer jumps all over the place and th...
1998 GMC Jimmy Envoy 4.3L Drivetrain VIN: 1GKDT13W7W
When putting this vehicle into 4WD All the wheels seem to lock up as if the brakes or ABS were on. On a lift the 4WD system works perfectly but soon as you go for a test drive the wheels seem to squeel and intermittantly lock up as if the ABS is being appied, ...
1996 Pontiac Bonneville SSE 3.8L engine VIN: 1G2HZ5218T
This is my Wife's car. It developed a severe engine miss. I found two rusted spark plug wires at coil terminals and installed a new set. The miss did not go away. A closer inspection revealed an exhaust valve protruding through the exhaust manifold on #6 cylin...
2001 Pontiac Aztek 3.4L Cooling fans VIN: 3G7DA03E41
Thanks everyone for your time. This Aztek will overheat at idle. Cooling fans operate when commanded from MT2500 on high and low speeds. Scan data shows correct coolant temp (verified by pyrometer) but PCM never commands fan(s) on. Data shows fans are off ...
2000 Saturn LS2 3.0L mil VIN: 1G8JW52RXY
hi again guys, this one really is being a pain in the you know what. I removed the trans to replace a leaking rear main seal, put it back together and forgot to plug in the conector on the trans. well I started it up and the MIL was on, i found my error and at...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Roadmaster 5.7L Poor Idle Quality, Misfire VIN: 1G4BT52POS
Well, the car's fixed. Most of you guys ended up saying it's probably the distributor, other things to check included cam/crank sensor signals(high/low resolution), PCV hose leaking, EGR stuck open, improperly routed/burnt wires, coil tower corrosion, MAF wire...
1992 Chevrolet C2500 Cheyenne 5.7L fuel gauge VIN: 1GCGC24KIN
Coustomer declined any further repair at this time on the truck, thanks for all the replies, checked all wires, had gas tank replaced, internal baffle was broke but did not solve the problem, replaced with good working gauge same problem.
1995 Pontiac Bonneville SE 3.8L Hesitation VIN: 1G2HX52KXS
Although I received no replies to this help request, I'm happy to say it is fixed. A new PCM fixed this one. I monitored the AC voltage at the servo position sensor tan wire. Closed throttle reading KOEO was .77 volts and WOT was 1.6 volts this told me the ser... Trouble codes: P1568 (cruise servo position), P1599 (cruise power management).
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