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Prev Professional Automotive Repair Technical Discussions for December 10, 2008
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Limited 3.8L radio and temp selector VIN: 1G4HR52L8R
The radio will switch stations at will and also when changing heater temp settings. The heat temp settings will change on their own and blower fan will turn on when set to off. this car does NOT have any controls on the steering wheel only on dash and radio. T...
2001 Cadillac Catera 3.0L Poor Idle Quality VIN: W06VR54R41
Hello to all, Need some help on this Catera. Vehicle came in po171 po174 po302 po303 po305. and a high idle problem vehicle had high idle prior to misfire replaced plugs and coil packs misfire gone still idles around 1100-1200 checked fuel pressure @ 30 PSI KO... Trouble codes: P0171, P0174
2006 Cadillac SRX 3.6L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GYEE63706
this vehicle was in a front end collision - came from body shop - cam sensor and actuator readings ok at cold start up - as it reachs operating temp misfire and mil - checked wiring ok - using tech 2 with candi module for diag - any help would be appreciated Trouble codes: P0021, P0300, P0348
1991 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19K0M
Hey guys, have a weird one here. This pickup is a well maintained old girl, engine replaced within 100,000km. Misfire is present at idle, idle is around 1000rpm, a little high. Cylinders six and seven(near back of engine on opposite sides of engine)misfire at ...
1994 Chevrolet K1500 5.7L No Start VIN: 2GCEK19K3R
Afternoon, All. I have a k1500 Chev 5.7L in the shop that will not start when it is cold (below 35 degrees), has good spark, and the injectors are spraying gas.There are no codes, history or present. Tried to prime with gas, still no start.Once it warms up,(af...
1997 Chevrolet S10 LS 4.3L hard start VIN: 1GCDT19X7V
Customer complains of hard to start when cold. Other mechanic could not duplicate complaint but found plugs fouled, a bad O2 sensor and cleaned the fuel system. Truck came back with same complaint. Unable to duplicate his compalint. Since it was a cold start p...
1998 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 1GNCT18W4W
i have a 98 blazer with cel light on custemr complant was it runs ruff i tested for the injectors and found that # 2 and 5 did not afect the way it ran so i replaced the injector sistem with the new and inproved ones from deler did not help replaced cap after ... Trouble codes: P0300
2002 Chevrolet Impala 3.4L Misfire VIN: 2G1WF55E12
This car came in for random misfiring so i gave it full tune up including coils and module.The vehicle comes back and they say it is still doing the same thing.So i test drive it to duplicate problem.Customer says it only does it at low speeds,so I shift it do...
2005 Chevrolet Cavalier 2.2L all lights on dash VIN: 1G1JC12F85
Customer came in with the complaint of all the dash lights flickering on and off and the gauges sweep just like when you first start the vehicle. pulled all the trouble codes and cleared them all. Test drove vehicle for 3 days with no problem and started this ... Trouble codes: U1064 (pcm loss of comm with bcm), U1088 (bcm loss of comm with sir), U1088 (bcm loss of comm with sir), U1000 (radio loss of comm with sir), U1016 (sir loss of comm with bcm/pcm/vcm)
2005 Chevrolet Trailblazer LS 4.2L ebcm VIN: 1GNDT13525
driver was stuck in deep snow checked all wiring to sensors and ebcm
1985 GMC S15 High Sierra 2.8L Poor Idle Quality, TIMMING ADVANCE VIN: 1GTCT14B2F
Truck came in for oil leak from intake manifold gasket (back of engine) R&R intake manifold gaskets, cleaned egr ports, new o ring seal to distributor, reset timming to 8 deg. and this thing starts and runs with a bad shake at idle 780 to 800 rpm, on accelerat...
1998 Oldsmobile Intrigue GL 3.8L abs VIN: 1G3WS52K5W
Hello all, I have this 98 Intrigue that is giving me fits. Cust came with CEL,ABS, and Traction control lights coming on when put into gear. Initial testing found Alt output low.Battery tested ok so replaced Alt. Road tested vehicle problem gone. 1 week later ...
1997 Pontiac Grand Prix GT 3.8L Steering wheel VIN: 1G2WP52K7V
I got this GP with steering wheel not coming off. I need to get it off, but for some reason this aluminium steering wheel housing and steel ring has come a part a little bit. So, I took the Air bag stuff off and a nut off. Using Snap on steering wheel puller f...
2000 Pontiac Bonneville SE 3.8L locks, windows,mirrors VIN: 1G2HX54K8Y
I'm testing the simple bus interface from the driver door moudule to the other doors. I'm trying to decide if I have just one or two problems. First I have battery voltage on the tan and white communication wire which tells me I have current bleeding over and ...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR5431H
Again, my apoligies for a premature post by a eager technichian that was not even directly involved. The reason for the "no start" for was that the exhaust was 100% plugged up. The reason for the catalytic converter meltdown will be resolved before the vehi...
1992 Buick LeSabre Custom 3.8L Brake Lines VIN: 1GHR5314NH
Thanks Guys, got lucky on this one. Got another 92 Lasabre in to look at. Ports on this unit weren't marked, took some cleaning to look at. The problem vehicle as rusty as they were did have the Valves on it yet, the other only rear lines were done, valves l...
1994 Chevrolet C3500 7.4L Excessive Emissions, Cuts out VIN: 1GBJK34NOR
Thank you to all that responded in an effort to help us locate this prom. A special thanks goes out to Boulderbros Module Repair for providing us with an OE part number for this prom. Our local GM dealer was able to obtain the prom using this OE part number....
1996 Chevrolet Tahoe LS 5.7L waterpump VIN: 1GNEK13R4T
Turns out some of you guys were right. It was infact a blown headgasket. 5000 miles and the right head blew the gasket. Thanks for all the help.
1997 Chevrolet K1500 Suburban 5.7L starter VIN: 1GKFK10554
I replaced dist cap & rotor,did not work but then again my starter may have been broke allready,I remember p/s hose leaking and i removed crank sensor and saw it was saturated w/ fluid,R&R hose Cleaned sensor and ring [& Starter of course] and low and behold...
2000 Chevrolet K3500 6.5L engine VIN: 1GBJK34FXY
replaced the fuel selonoid and problems seems to be fixed. thanks for all the suggestions.
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S82
The vehicle is fixed looks like the main problem was the cam sensor,I changed it reset the fuel trims and all seem to work fine.Thanks to all who replied. Trouble codes: P0171 (system lean bank 1), P0172 (system rich bank 1), P0340 (cam sensor sygnal problem).
2006 Chevrolet Impala LS 3.9L heater VIN: 2G1WS55146
Thanks for all of the replies. I took the heater hose pipe loose and filled it with coolant, and ran the engine at 1500 rpm's or so and it bled the rest of the air out of the system. Now I have hot heat at idle. I did the same procedure on the other 2 cars we ...
2007 Chevrolet Silverado 3500 Classic LS 6.6L cruise control VIN: 1GBHKK3464
Please forgive me for making this post so late. Where I work, we have been smoked with other work that I have not had a chance to grab this truck and try to make the high idle appear. There were 3 techs that had an answer to my situation. Andrew from Utah i...
1993 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV22P8P
all good thoughts rechecked everythjng replaced ecm and now have spark Trouble codes: 41 (optispark ignition system open or shorted).
2003 Pontiac Grand Prix SE 3.1L ign lock cyl ctrl actuator VIN: 1G2WK52J83
Thanks to all of you who suggested we go back to the shifter - which was virtually everyone who offered help. We found the PPL/WHT wire (pin D3 - Circuit# 1630) broken right at the connector giving us the open circuit. We slodered in a new .66 cent terminal ...
2006 Pontiac Grand Prix 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 2G2WP55206
Thank you for all the help I found a bad wire in the harness between connector c101 and the throtle body. Trouble codes: P1125, P2138.
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