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Prev Professional Automotive Repair Technical Discussions for September 8, 2010
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Open Help Requests for GM
Help Request Answers
1994 Cadillac Seville STS 4.6L Poor Idle Quality, Surge VIN: 1G6KY5296P
surges at idle , even with isc disconnected. found vacuum leak at intake top cover, replaced map while i was there. customer replaced tps and isc before bringing to me. had numrous could at first but only p023 returns.tested grounds and power to sensors . all ... Trouble codes: P0023
1990 Chevrolet P30 7.4L No Start, Stall VIN: 1GBKP37N6L
this 33foot motor home came in and will stall in about 15- 20 miles seems to be blowing #7 fuse ecm. only has a 10amp fuse, but installed 20amp still the same thing, put a 15 amp breaker in and doesnt stall but sputters when warm,almost like is going to stall ... Trouble codes: 43 (esc module)
1999 Chevrolet Cavalier Z24 2.4L Misfire VIN: 1G1JF12T5X
Have replaced all ignition components, timing chain, crank shaft sensor, have rechecked timing, and to no avail all 4 cylinders are missing. No vacume leaks found, fuel pressure at 42 psi, compression at 200-220 all cylinders. Injectors ohm good. Vehicle runs ... Trouble codes: P0300
2000 Chevrolet Silverado 1500 LT 5.3L Extended crank time VIN: 2GCEK19T3Y
No codes. Mode 6 shows inefficient catalyst bank 1 and 2. New crank sensor was installed and performed crank relearn procedure. Data does show no rpm response while cranking when problem occurs. Problem is intermittent. Weather and temperature seem to have no ...
2003 Chevrolet Silverado 1500 5.3L Front Axle Actuator and ABS Module VIN: 1GTEK291X3
This customer started his truck on Sunday and said the cluster lit up like a christmas tree. I narrow it down to the amber abs, red brake light, and "service 4wd" indicator in the cluster. After doing some testing, I realize that the ABS module and front axle ...
1996 GMC C1500 Sierra SL 5.0L Poor Idle Quality, Misfire VIN: 1GTEC14M1T
the truck came to me running severely rough and the oil was mixed with coolant (was a couple inches over full on dipstick.passed compression test. replaced head gaskets and intake gaskets.properly adjusted lifter preload.followed proceedure for distributor ins... Trouble codes: P1345
1996 GMC K1500 Sierra SLT 5.7L Differential VIN: 2GTEK19R9T
this truck omly does this in 4 wheel hi,(4 lo and 2 hi are unaffected) when the wheels are turned to hard left or hard right it feels like the brakes are applied as soon as you straighten the wheels it releases. has anybody seen this before? any help on this w...
2001 GMC Sierra 1500 SL 4.3L abs VIN: 1GTEL14W61
Hi every one. I would like some in put before I get into this one. The abs light is on alaways and the abs pump motor will not shut off unless you take out the fuse or unplug the wires on the abs punp it self. My tech 2 gives a code of c265 of ebcm motor relay...
1998 Oldsmobile Aurora 4.0L System Overheating VIN: 1G3GR62C8W
This car can indle all day long and not overheat it only overheats while driving on highway after 25 miles
2000 Saturn LW2 3.0L Excessive Emissions, Stall, MIL Lamp on VIN: 1G8JW82R9Y
Car came in with stalling problem and above codes were detected with scan tool. Upstream o2 sensors stay at 900mv at all times, even if i create a vacuum leak. Downstream sensors voltage normal but wont go into closed loop. Now wondering if the computer may be... Trouble codes: P0172, P0175, P0101, P0136, P0156
2002 Saturn Vue 3.0L Heated Seat VIN: 5GZCZ63404
Above mentioned vehicle arrived at our shop with the customer complaining of the drivers seat heater not getting hot. Confirmed complaint, no heat within drivers seat. After testing the the usual suspects, (switches, ground, power, etc,) and conferring with th...
2004 Saturn Vue 2.2L long crank VIN: 5GZCZ23D64
please help i have this saturn vue it seems that after it sits for anwhere from like 20 mins after a test drive it will have a starting problem not always though when you go to start it will spin over normal and then it willsound like it tries to fire out of t...
2007 Saturn Aura XR 3.6L No Start VIN: 1G8ZV57717
This car came in as a no start. The customer stated that it ran rough for a few days but would start. It sat in his yard overnight and now will not start. He had tried starting it until it killed the battery and i had to replace it so i have no codes to go on ...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue Ultra 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4CU5219S
After checking relays and solenoids and found none where out of specs. I installed new ecm all problems cure speedo works Idle back to normal. So for now the Buick is running great. thanks for all the responses. just about everyone seem to no exactly what was ... Trouble codes: 1640 (1650 -), 1650 (1670 -), 1670.
2005 Cadillac CTS 2.8L MIL Lamp on VIN: 1G6DM56T85
Thanks to all who offered help. There were three issues with this car. #1 the fuel tank pressure sensor was bad. #2 pin 25 at the pcm or the plug itself is bad. It is not bent or broken but the pcm cannot ground this circiut on pin 25 for one of two reasons ... Trouble codes: P0450, P0453.
1985 Chevrolet Camaro Z28 Iroc-Z 5.0L Excessive Emissions, Poor Idle Quality VIN: 1G1FP87FXF
Well first of all i want to thank everyone who took the time to read my problem a lot of people thought that coolent temp. but that wont make injecter pulse go from 2 mil to 13 mil at idle. What i did do was ajusted the valves and found that they were all to ... Trouble codes: 43.
1992 Chevrolet Camaro RS 5.0L Excessive Emissions VIN: 1G1FP23E4N
After reinstalling the stock ECM and PROM, the EGR solenoid once again worked and brought the EGR system back to life decreasing the NOX failure. The other inputs along with the rolling IAT signal were also brought into normal ranges. We also found the ignitio...
1999 Chevrolet Tahoe LS 5.7L steering (stiff spot) VIN: 1GNEK13R6X
Thank you very much for all of the input!! I replaced the high side power steering hose and the problem is GONE!
2002 Chevrolet Cavalier LS 2.2L Hydraulics VIN: 1G1JC52422
Thanks for all the help everyone. I took the transmission back down and removed the pressure plate and clutch disc. the pressure plate was a bit weak but not too serious. The disc on the other hand had blue spots from the heat and all 4 springs were broken....
2003 Chevrolet Avalanche 1500 5.3L transfer case VIN: 3GNEK13T43
Hey guys! It is fixed. Thanks for all the great ideas, especially the ones about grounds. That got us looking from a different angle. As usual it ended up being something simple. There was a bad connection at the range switch. Sorry if I waited too long to re...
2004 GMC Envoy XUV SLT 4.2L battery VIN: 1GKES12S64
Traced draw at radio through communication splice pack.With key on engine off would still have communication on bus line elimanated BCM and rear splice pack found draw caused by instument cluster. Replaced cluster and cured draw.Thank you to all who responded....
2004 GMC Envoy XL SLT 4.2L Front wheel drive VIN: 1GKET16S14
The problem was two fold. First, the intermediat shaft bearing housing is not available as a unit. The individual parts are available from the dealer (at a great price). Secondly, I talked to the customer(who was driving car at the time) and got the real st...
1995 Oldsmobile Silhouette 3.8L stumbles on start VIN: 1GHDU06L95
Hello again, The customer picked up the van and will return it in a week or two. I recieved some good info on the timing control and i believe its going to take a computer. I had a few replies about coolant leaking into a cylinder there is no coolant loss and ...
1998 Oldsmobile Intrigue GL 3.8L coolant in oil VIN: 1Q3WH52K8W
removed heads and sent to head shop for checking .they found one head with .007 warpage. reistalled heads and hope it is ok.
1993 Pontiac Bonneville SSE 3.8L ect. VIN: 1G2HZ52LXP
Its fixed! Thank you all for you ideas and help. I started by checking the runout of the front hub bearings and they were good. I put the customer installed brake rotors on the hubs and re-checked. I found that one of the rotors had a runout of .012 and th...
2001 Saturn SL 1.9L gauges VIN: 1G8ZH54861
Sorry guys and thanks for all your help again but I have to close this without a fix. Customer stated that that she only drives it a few miles at a time and could I just make the cooling fan run all the time, (it was also inop when the cluster failed). so I pu...
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F92
I had a friend who works at a junk yard cut a convertor off a saturn that came in .We cut old one off and put new one on and he has about 100 miles on it so far and no lite. We i have learned my lesson by puting after market ones on. Trouble codes: P0420.
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