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Prev Professional Automotive Repair Technical Discussions for March 12, 2009
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Open Help Requests for GM
Help Request Answers
2004 Buick Rendezvous CX 3.4L Starting VIN: 3G5DA03E54
Vehicle towed in. Engine stalled,No crank.Starter motor(not solonoid)clicks. Removed starter, benched tested ok.Checked loaded voltage at starter positive post,battery voltage minus .5 volt. No voltage/voltage flucuates on solonoid wire when turning ignition t...
2006 Buick LaCrosse CX 3.8L release cable VIN: 2G4WC58206
greetings - this LaCrosse "cx" needs a new hood release cable. guess what? i can't open the hood to get at the latch. looks like i may have to punch a hole in the grille to get at the workings. the grille is $300.00. does anyone know a way to get at the latch ...
1990 Cadillac Eldorado 4.5L Poor Idle Quality VIN: 1G6EL1339L
To all; I have this cherry 1990 eldorado in the shop. The customer had dicovered that one of the egr tubes that stand up in the bores under the trottle body in the bootom of the intake is loose. Not loose enough to pull out,and I don't think it leaks. has anyo...
1977 Chevrolet Corvette 5.7L relay VIN: 1Z37X7S447
hello all and thanks for helping. we have isolated the 150ma draw with key off to a relay under center console. we cannot find the function of the relay in any of our schematics. all options seem to function okay with relay out. the relay has 4 pins, 5 wires, ...
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L Poor Idle Quality, Surge VIN: 1G1YY2183J
Hey all, have a tuned port 5.7 corvette. Has a rough idle after closed loop kicks in. Doesnt run too bad in open loop but not smooth. Will run good in back up spark and fuel mode. Block learn and integrator indicates a rich condition. Plugs are turning black. ...
1996 Chevrolet Caprice Classic 4.3L Misfire VIN: 1G1BL52WXT
Need some help. customer came in with misfire. checked the scanner and had every cylinder missing. The water pump was leaking horribly bad. the plugs and wires were original. along with the cap and rotor. I replaced the water pump and did a full tune up plug,w... Trouble codes: P0300
1998 Chevrolet P35 5.7L No Start, Poor Idle Quality, Surge, Cuts out VIN: 1G347BRR4P
hey guys, this should be an easy one but has me stumped. customer is a beach vender drives vehicle about 2 miles a day. came in complaining of surging idle and stalling. checked fuel pressure when the vehicle would surge pressure would fluctuate between 40 an...
1999 Chevrolet Silverado 1500 5.3L Cooling Systems VIN: 1GCFK19T8X
Thanks in advance for your help. I mistakenly thought this one was going to be simple. This commercial customer came in and stated this truck overheats and they replaced the water pump, fan clutch, and less recently the radiator. The radiator came in hemmoragi...
1999 Chevrolet Blazer 4.3L gauges, lights VIN: 1GNDT13W3X
This Blazer has intermittent gauge & lamp malfunctions, when the problem is occurring no communication is possible with any modules. Oil pressure, tach, & volt gauges still work, temp & fuel gauges inoperative, (batt, low fuel, security, ABS, & SES) lamps are ...
2000 Chevrolet Tahoe 5.7L lower control arm VIN: 1GNEK13R7Y
Car came in with pulling problems and customer compained of right front tire hitting on full left turns . Found very loose gear box & pitman arm ( nothing obvious with tire hitting problem ) but can hear tire rubbing on full left turn and can see where tire wa...
2002 Chevrolet Malibu 3.1L Gauges VIN: 1G1ND52J42
Help! Above vehicle is from friends used car inventory. The junction box 10 amp fuse for BCM power blows killing gauges and BCM controlled outputs- but only when he's trying to sell the car. The one that goes is fuse 37 in underhood junction box. He installed ...
2002 Chevrolet Prizm 1.8L No Start VIN: IY1SK5280R
Vehicle came into shop after second coil replacement as a no start condition. We are able to start the vehicle for 1 second then it loses the injector pulse. We will replace the coil under warranty again but need to find out why they are burning out and get th... Trouble codes: P1300
2002 Chevrolet Impala LS 3.8L engine VIN: 2G1WH55K72
Car does not start right away, sometime you need to crank for several seconds before it starts. Checked codes with Modius scanner, codes P0128 & P0502. Replaced VSS and connector, coolant temp shows T-stat operation is good.
2003 Chevrolet Silverado 2500 HD 6.6L 3/4 shift VIN: 1GCHK29183
if you clear code p0776 than test drive trans will work fine untill pcm commands 4th gear,will neutral out than shift back to third and stay there untill code reset. pulled pan and found no metal or clutch material,fluid burned slightly i suppose from 3rd gear...
2004 Chevrolet Suburban 1500 LS 5.3L rear windows inop. VIN: 1GNFK16T24
Both rear windows inoperative and the cancel switch is not on "he he". Power and ground is fine to both rear switches. This system runs through body control module and "down" "up" inputs can be seen when pressing master switch but no recognized when pressing r...
2004 Chevrolet Silverado 2500 HD 6.0L No hydroboost assist VIN: 1GCHK23G84
OK guys this is one of those deals and i feel rather stupid by such a simple problem but here it goes. This truck came in with a power steering pump noise and the complaint of while setting with the brake applied the power steering was only good for about one ...
2004 Chevrolet Silverado 2500 HD 6.6L 2-1 downshift VIN: 1GCHK232X4
This is my own truck. The trans shifts and works great with no other problems. Except when you are coming to a stop it feels like it waits till you are almost stopped and then it shifts down to 1st. When it shifts down it does so abrubtly and it almost feels l...
2006 Chevrolet Colorado LT 3.5L abs VIN: 1GCDT13656
Truck came in with ABS light on. Pulled codes came back with coo35 L/F speed sensor. Teast drove with scan tool. L/F speed sensor dropping out. R/F and rear equal. Replaced L/F speed sensor, no change. Went threw GM diagnostic for c0035 and everthing good. No ...
2007 Chevrolet Silverado 1500 LT 5.3L rollover sensor VIN: 1GCEK13M17
Help Guys I have this 2007 Silverado 1500 the customer bought wrecked (no warrenty ) with air bag module blown We installed a new SRM cleared codes & it came up with a internal error in rollover sensor. So I got a new ROS from GM and installed it (pinged it) a...
2002 GMC Sierra 2500 HD SL 6.6L push rods VIN: 1GTHK23152
To the Duramax techs out there. This is the first DMax that we have done any major work on. It came in with the typical smoking with rough idle, which indicates bad injectors. We ordered a set of 8 from out GM dealer and replaced them. The job went well overal...
2007 GMC Envoy SLE 4.2L stabilitrac VIN: 1GKET16S86
I have a code c0455 front steering position sensor circuit malfunction. The service stabilitrac light comes and goes, there is no reason to it. Other than replacing that sensor is there any issues that are known about this code or anything I should know before...
1998 Oldsmobile Intrigue GL 3.8L MIL Lamp on VIN: 1G3WS52K3W
THANKS IN ADVANCE I was blessed with this return work from another shop They had replaced lower intake gasket and upper intake manifild due to coolant leak Found lower intake bolts not properly torqued. removed upper and lower intake and replaced gaskets The v... Trouble codes: P0171 (system lean bank 1)
1994 Pontiac Grand Prix SE 3.1L Stall, MIL Lamp on VIN: 1G2WJ52MOR
Thank you for your help. This car came in running rough some of the time,and good others. Vhicle is also stalling out of the blue. First found ot of spec. on the map then replace. This seems to have cleared up the rough running, but still is stalling out with ... Trouble codes: 86 (Analog/Digital ECM error)
2006 Saturn Ion-3 2.2L Misfire, MIL Lamp on VIN: 1G8AW15F46
This Ecotech engine sets a PO300 random misfire code.I can watch misfire data and see misfire counts on #4 cylinder.Customer's only complaint was MIL light on.They did not notice misfire.You can feel slight miss at idle.There are no misfires at any RPM's above... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L No Start
Thank you for all the ideas. Michael from California had the right idea of a bad connector. I kept checking coolant temp readings and finally found it reading -38 celcius. Repaired poor connector and vehicle has been fine for two weeks. Poor conection at temp...
1997 Cadillac Catera 3.0L Unknown VIN: W06VR52R0V
1998 Cadillac Seville STS 4.6L head gasket VIN: 1G6KY5497W
Thanks for all the replys, thank god I was informed about headbolt tread kits, I revised the headgasket estimate to customer and he decided not to fix car. good for me, was not looking foward to this job, Thanks Again
1991 Chevrolet R3500 Silverado 7.4L lock up VIN: 1GCHR33N3M
thanks to all that replied back, particularly those who said check that distributor out. the bushing was worn out causing a erratic timing signal to the pcm, there for the pcm was turning the lock up solenoid on and off. would of never found the problem caus...
1994 Chevrolet C3500 6.5L engine VIN: 1GBKC54F6R
hey thanks for all of the help it was the pdm and thanks for the tips on the cable.
1999 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDXO3E9X
Thank god this van is fixed, Thanks to Larry, James, Timothy and Alex each gave good info. Alex was very close, I learned i need to test each code pulled. Both circuits were getting batt voltage, but once i plugged in the cam sensor, i would lose batt voltage ... Trouble codes: P0336, P0341.
2002 Chevrolet Trailblazer LS 4.2L no communication VIN: 1GNDT13S62
Thank you so much for the replies. David and Deke nailed it. I had looked at the tail gate wiring early on and did not see any damage but after receiving the replies I looked again but more extensivly. I did a voltage drop on the ground circuit when running an... Trouble codes: U1000, U1016, U1088, U1301, U1305, U1064.
2004 Chevrolet S10 LS 4.3L Cuts out, Stall, Misfire VIN: 1GCDT13X64
Well the replies indicating to chk the alt. wave form made sense to me, I did chk it under load and no load and all checked out just fine. The next day the customer came in and told me he traded the truck in. I don't have any more to offer. i would have liked ... Trouble codes: P0335 (Crank sensor Circuit), P0341 (Cam Sensor Circuit).
2005 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEK13T45
Hello Fellow Tech.'s Well this one is fixed. I would like to thank each and everyone who responded so quickley. To Curtis from Texas and to Jon from Oklahoma, I did Check the fuel pressure regulator and it was good thank you both very much for responding. Ki...
2005 Chevrolet Trailblazer EXT LS 4.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDS13S75
Thanks for all the replies to this problem. Thanks Johnathan for the bulletin on the intake valves. This turned out to be the problem. The customer is going to see if chevrolet will help him with this problem. I did find a bulletin on Colorados with the 2.8 ... Trouble codes: P0300 (random cylinder misfire), P0014.
1997 Oldsmobile Silhouette 3.4L Door locks and Dome lights VIN: 1GHDXO6E4V
I replaced the BCM and so far the problem has been fixed. I drove it around myself for 3 days and no problem. Thank you for your help.
1997 Pontiac Grand Prix GT 3.8L No Start VIN: 1G2WP12K8V
This one is fixed. First off I just want to thank EVERYONE who took the time to read my problem! So the first thing I had tried was the 3x ppl/wht wire to trigger the injector with a noid light hooked up, no change. So I went with my gut feeling and reinsta...
2000 Pontiac Grand Am SE 3.4L Misfire VIN: 1G2NG12E8Y
Thanks to Tim from Wisconsin. Who would have thought that I could have 2 Sensors (Standard Motor Products) that were BAD right out of the box? I installed an ACDelco sensor and all is well. This one drove me NUTS. What I think I had initially were 2 separa... Trouble codes: P0336, P0300.
2002 Pontiac Grand Am SE1 2.2L No Start VIN: 1G2NF52F12
thanks to all who replied, you tips were very usefull. crank sensor had checked out ok, also performed pass key reset to no avail. the pink wire at the ignition control module never lost signal, the catch is it was only at 6.8v with the key on, as was the fuel...
2003 Saturn Vue 3.0L internal engine VIN: 5GZCZ63B63
Customer was offered options of teardown and oil system inspection and repair, used and new short blocks. Vehicle remains in our lot (neighbor and long time customer) until decision and or funds become evident. I will post any results when it comes to fruitio...
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