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Prev Professional Automotive Repair Technical Discussions for March 9, 2006
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L Stall, hard start VIN: 3G4AH54N0L
Hello . Vehicle was towed in complaint was could not accellerate. I started vehicle & it idled ok but when you go to put it in gear it dies right out .At times the idle seems normal other times it seems a little rough. At times when it dies it is also hard to ... Trouble codes: 42 (history code EST Circuit)
1997 Cadillac Eldorado 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL12Y1V
Hello Everyone I have this Eldorado with the Northstar 4.6.problem is MIL lamp on dtc#P0340 lack of cam signal to pcm.we have replaced the cam sensor and the ignition module the code sets imediately on start up.checked signal going into ign.module from cam se... Trouble codes: P0340
1973 Chevrolet elcamino 5.7L heater core
I'm in the middle of removal of the heater core, looks like the dash may have to come out to get the heater box off, checked a 1973 repair manual in my personal collection, and it had no removal info. THANKS IN ADVANCE FOR ALL REPLIES!
1992 Chevrolet Lumina 3.1L Stall VIN: 2G1WL54TXN
customer complains of vehicle stalling intermittently, but always restarts, found ckp cracked and replaced it, thought that would solve problem, but customer was back a couple of weeks later with same problem. customer states once vehicle stalls the first time...
1992 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, High Idle VIN: 1GTDC14Z0N
Idle is high, 1000 RPM in nuetral, when put into gear the RPM climes to about 1500 which is about the max the iac will allow, when put into neautral the RPM climbs to about 1800 and very slowly comes down. I do not have a clue what is causing this, no TSBs des... Trouble codes: 44 (Lean Exhaust)
1996 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W7T
Blazer came in with a SES light flashing and a complaint of a rough idle. Engine misses on #3 at idle. When power braking the miss goes away. Miss counter goes to zero. Both running and cranking compression is good. Have replaced #3 injector and plug. Wire is ... Trouble codes: P0300 (Random Misfire)
1997 Chevrolet Lumina 3.1L starter VIN: 2G1WL52M7V
Need help bad!! It was brought from another shop which already replaced the starter and the ignition theft lock. The problem is the car won't crank with the ignition switch. Have checked all the fuses and wiring. Getting no power down to the purple starting wi...
1998 Chevrolet Venture 3.4L push rods VIN: 1GNDX03E7W
Got stupid, took off rocker arms and did not notice long and short push rods. Need to know which is short exhaust or intake. Thanks Mike
2000 Chevrolet Impala LS 3.8L No Start VIN: 2G1WH55K4Y
car was dropped off for rough running when started. next morning would not start. will crank & sometimes start but stall like injectors shutting down, or just backfire in intake. disconnected fuel pump and hooked up bg injection cleaner with gas in it, same pr... Trouble codes: P0300
2000 Chevrolet Silverado 1500 4.3L No Start, Engine Flooding VIN: 1GCEC14W1Y
Vehicle towed in as a no start. Customer stated he was driving and started to lose power; he then pulled over and vehicle stalled. When he tried to restart vehicle it wouldn't crank over. Pushed into shop and verified no start. It almost sounded like engine wa... Trouble codes: 0300 (random cylinder misfire)
2002 Chevrolet Express 3500 5.7L Turn Signals VIN: 1GBHG31R62
I have a Chevy Van with a service body on it. When it first came in I noticed that when you used the right hand turn signal both turn indicators would light up in the dash and blink fast. Replacing the right Turn signal socket fixed the "both indicator" proble...
2004 Chevrolet Impala LS 3.8L speedometer\tach VIN: 2G1WH55K64
HI again folks-we have an Impala in which the speedometer gets stuck at certain spots-ie 110mph.tach also erratic and sometimes inop.scanner shows good speed signal.can sometimes get speed to zero mph by cycling key 5 times or so.then works ok for a time-then ...
1999 GMC Sonoma SL 4.3L abs VIN: 1GTC514X1X
Hey Guys, We have read the tsb,s We have replaced the rotors with the abs rings ,wheel bearings and sensors from the dealer and are still getting low speed activation of the abs especially when turning. I have read all of the archives on similar problems and n...
2000 GMC Jimmy SLE 4.3L 4x4 VIN: 1GKDT13WY2
customer has brought in vehicle for intermittent 4x4 engagement on its own.says they had parked vehicle,and on restart,4x4 was on,and could not disengage.once at the shop,we could not duplicate this condition,and everything seems to be functioning properly.veh...
1992 Oldsmobile 88 Royale LS 3.8L oil pressure VIN: 1G3HY53L1N
this car came in with an external coolant and oil leak at the lower intake. removed intake and motor was clean for the mileage. no signs of internal leaks. my mechanic did use cookies to clean surfaces. reassembled car and road tested:no problems. 3-4 days lat...
1998 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W3W
customer complains of ses light on. pulled codes for o2s heater circuit. replaced o2s twice. also o2 heater circuit fuse blows.have tested all wiring and found no problems at time of testing. grounds are good. assume short, but unable to locate. any ideas or s... Trouble codes: P0135, P0147, P0155, P1153 (insuffcient switching of o2s)
1998 Oldsmobile Silhouette Premiere 3.4L will not go over 2500 rpm's VIN: 1GHDX03E5W
engine will not go over 2500 rpm's
1999 Pontiac Firebird 3.8L No Start VIN: 2G2FS22K4X
I have a strange one here, customer was driving and car stalled like it was chugging for fuel and would not restart. I checked fuel pressure and it was at 45psi. Checked for spark with my scope and we did have spark, but then the rear coil caught fire and we r...
1996 Saturn SL2 1.9L Door Locks VIN: 1G8ZK5270T
I am having problems with my interior locks and lights. I have checked the fuses and none appear to be blown. Also the service engine light and the check engine light are on. I have hooked a computer up but I am not getting a reading to the data link to check ...
2003 Saturn Vue 2.2L mil VIN: 5GZCZ43D93
I never seen this before. The costomer came in with "service engine soon" light on. I put it on the scaner (Snap-on Brick) I got no codes. I went to history, No codes, I went to transmision,-No codes, next ABS-no codes then SRS-no codes. At this point I figure...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Seville STS 4.6L tcs activation VIN: 1G6KY5292V
thank you to all who took the time to reply, after spending time comparing sensor amplitude outputs on our lab scope with all wheel speed sensors on screen ,as many recommended,we found a slight increase in our new sensor (left front)output but not enough to m...
1998 Cadillac Catera 3.0L speedometer VIN: W06VR52R2W
Hi : Thanks for all the repies. Customer driving with the radio power supply disconnected and the speedometer never quit working. Yesterday we hook up the power wire back to the radio,removed the radio and inspected the wirings again,make sure no wires are t...
1981 Chevrolet Camaro Berlinetta 3.8L No Start VIN: 1G1AS87K4B
Thanks all for responding.There are lots of great replies and a couple that nailed it.The problem was the new choke spring was way too tight and didn't allow the choke plate to open while cranking,flooding it out.I removed the retainer with the locating tab an...
1990 Chevrolet Camaro RS 3.1L Excessive Emissions VIN: 1G1FP23T3L
problem ended up being injectors. replaced other 4 along with the 2 I already replaced, still reads a little on the rich side, but my emissions look good.
1997 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13RXV
As suspected and as many said, the O2 sensor did fix the problem. Two things that confused us on this: The O2 sensor had a very good wave pattern, the only problem is that it was oscillating at the .05 volt range instead of the .5 volt. The other confusing fac...
1998 Chevrolet Astro 4.3L radio and door lock VIN: 1GNEL19W7W
Thanks to all who replied.I decided to probe the speaker wires with key off and there we found the problem.The rear speaker wires had voltage on them.The culprit turned out to be a very green connector C300 which is in the drivers kick panel.There is also a do...
1998 Chevrolet Venture 3.4L head lights
I did check the diodes and did find one of them very questionable so we replaced the alternator and battery after doing so we noticed that all of the electrical components were working a little better Thanks to all who helped out Dean [...]
2001 Chevrolet Silverado 2500 6.0L No Start, Stall VIN: 1GCHC29U11
Thanks For The Help. Most Said Replace IGN Switch, I Rechecked Grounds At The Tank Frame Area, The Grounds At The Left Front Cab Mount Frame Area And The Grounds At The Rear Of The Right Head. All OK. It Would Not Act Up For Me. I Call A Friend At The Local Ch...
2000 Geo Metro 1.0L Excessive Emissions, MIL Lamp on VIN: 2C1MR2269Y
Thanks for all your help. To conclude this I will have to admit that I hate o2 sensors that fit all. After further investigation the sensor I installed was wired wrong the signal and ground wires were reversed. Worked well when wired correctly. Trouble codes: 134 (b1 s1 inactive 02).
1997 GMC Jimmy SL 4.3L transfer case VIN: 1GKDT13W4V
THANKS EVER SO MUCH you guys are all great. This one is finally fixed. Special thanks to Ed and Peter who responded after my update with their previous experiences. I went to work this morning and before going to Tim Hortons I did as Ed and Peter suggested, un...
1999 Pontiac Montana 3.4L Surge, MIL Lamp on, no tachometer VIN: 1GMDX03E3X
The fix turned out to be the cam sensor. I decided to disconnect the cam and crank power wires at the PCM to see if that would make a difference. I then had power at the cam sensor, but not the crank, so I figured hey, it's more than I've found so far. So I ho... Trouble codes: P0327, P0336 (Crank Sensor A 18x/24x Out Of Range).
2000 Saturn LS1 2.2L W/Wipers VIN: 1G8JU52F2Y
thanks to all for info. I took all load off wiper motor and watched cycle in Delay Mode, the motor would pause once in each direction (up then down)not complete a Delay Cycle. I figured a park switch in motor might be at fault, (replies I recieved). Installed ...
2002 Saturn L200 2.2L odometer incorrect VIN: 1G8JU54F72
I want to thank everyone for your help as we have now fixed the vehicle. I had to go back to the customer shop and disassemble the vehicle to find they had a technician working on the vehicle who couldn't tell the difference between a BCM and a PCM. They had b...
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