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Prev Professional Automotive Repair Technical Discussions for October 5, 2006
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Open Help Requests for GM
Help Request Answers
1993 Cadillac Seville 4.9L Rear sway bar VIN: 1G6KS52BXP
Rear sway bar is hitting on bottom of left rear shock when car bounces, normal position has 1/4" away. Wearing shock out & shocks are expensive & hard to find
1994 Cadillac Seville SLS 4.6L trunk motor VIN: 1G6KS52YXR
automatic trunk closer motor is not working. iwill have this car in tomorrow dealer said there is several relays for \\this to work and might not be a bad motor.quit working after they hauled bike in trunk. i would like to know where i should start my search w...
1997 Cadillac DeVille 4.6L compressor VIN: 1G6KD52Y1V
OK Fellow Techs here is my problem.This Cadillac came into shop with concern that the compessor cyles off to soon and no cooling.We checked the refrigerant and it is full.We checked for codes and found a code for a shorted high pressure temp switch we discharg...
1988 Chevrolet Celebrity 2.8L Surge, no power VIN: 2G1AW81W2J
car wont go over 20 MPH -- but will spin the tires from standstill - Problem is I got wrapped up into doing a scan -- all garbage and all screwy ( RPM 600 KOEO , MAT = 158 etc) so I "jumped" and replaced the ECM which had no improvement. Confirmed with a Mas...
1990 Chevrolet G10 Sportvan 4.3L Hesitation VIN: 1GNDG15ZXL
this van is driving us crazy. under accell if falls flat on its face. we tried dropping the exhaust at the manifold thinking the cat was plugged but that was not it. when problem occurs, if we spray choke spray down the tbi unit the van picks right up. we saw ...
1995 Chevrolet Astro CL 4.3L Excessive Emissions, Surge VIN: 1GNDM19W8S
Vehicle was parked for about a year. Drained fuel, added premium fuel and inj. cleaner. Changed oil and filter.Failed Etest badly [3 1/2 times allowable hc at idle and almost 6 times allowable co] Runs very rich cold not too bad warmed up. Watching ign advance...
1996 Chevrolet Blazer 4.3L shifting all gears
Hi Friends, This truck came to me from a local trans shop who rebuilt the transmission. Using a scan tool the trans operates fine, without the scan tool it jerks, shifts hard and drives like a pile of you know what. I've Checked and rechecked the common patter...
1997 Chevrolet C1500 4.3L Poor Idle Quality, Hesitation VIN: 1GCEC14W7V
Please Help !!! when the truck can in, the Mil was not on. Scaned found no code's. tps on data found no voltage at closed throttle, wot 0.6 .Mil still not on. took out tps and found no spring tention, replaced tps and found no voltage, wot there is 0.6 volt st... Trouble codes: P0122, P0046, P1122, P1406
1997 Chevrolet Astro 4.3L steering box VIN: 1GNDM19W8V
suspect the control valve in the gear, would like some help before going on with r@r of gear. thanks joe.
1998 Chevrolet Cavalier 2.2L clutch VIN: 1G1JC1242W
car came in on the hook and wouldnt move forward or reverse.goes into gear no problem.fluid was full in master cyl.we opened slave bleeder and shot out as if pedal was pushed in.after pressure was released car drives fine.clutch pedal feels a bit soft but does...
1998 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDX03E4W
This van just came to me with a rough idle & the MIL on. I did a scan and it came up po306 misfire on #6 so I thought it would be an easy fix like a tune up. I changed the plugs & wires and still have the misfire on # 6. I am getting spark and when I pulled th... Trouble codes: P0306
2002 Chevrolet Avalanche 1500 5.3L MIL Lamp on VIN: 1G134TD342
anyone seen this set up with ecm providing ground and not enough continuity to pull solenoid shut? I am leaning towards a bad solenoid , but during my tests I put 12v and ground to connections and solenoid works fine. bad driver? or will a weak solenoid refu... Trouble codes: P0440
2003 Chevrolet Express 3500 6.0L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCHG35U23
Vehicle came in with skip. Never tuned up in 90,000 miles. Performed complete tune up. After long day of driving, vehicle started skipping again and stalling. Got code P0200. Checked for injector pulse,OK. Also have skip on cylinder 1 and 8. Did balance test,O... Trouble codes: P0200 (Fuel Injector Control Circuit)
2004 Chevrolet Silverado 3500 8.1L Transfer Case VIN: 1GCJK33G14
Customer has leaking transfer case (np 263 hp/nvg 263 np1)Removed and resealed did not leak for a couple of weeks. It began to leak again.There is no gasket just rtv. Has anyone encountered this or have a fix. Thanks in advance.
1996 Geo Tracker 1.6L Excessive Emissions, No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2CNBE1360T
Thank you in advance for any help. This Geo has me stumped. Fuel pressure is higher than Mitchell specs, wich is 30-37 psi. I have 44psi regulated and 50 or higher unregulated. Vehicle will hardley run past 5 miles per hr. Vehicle is running rich. Replace fuel... Trouble codes: P0300
2000 GMC Jimmy Diamond Edition 4.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKDT13WXY
Hello all,I am posting this truck again. I was closing the original and the cust. called.Same condition and codes.It took 2wks and 300mi to act up. I am including the original post& up date. Also, when acting up, B1S1 O2 is at 890mv on DVOM while scan data say... Trouble codes: P0171 (B1S1 lean), P0300 (multi missfire)
2001 GMC Yukon XL 1500 SLT 5.3L No Start VIN: 3GKFK16T11
The vehicle was towed in. Crank but no start. No way to really test the continuity at the pump itself, we did not hear the usual "buzzing" noise that the GM pump makes. This vehicle does not really allow us to lower the tank enough to have the enough space for...
2004 Hummer H2 6.0L rear a/c VIN: 5GRGN23U04
Need some help with this one guys. First need to know how much freon one of these streched limos should hold. Here is the problem...custoner concern (e.g. complaint) is no cold air in rear of limo.Front air seems to cool well. There is one compressor, two cond...
1988 Oldsmobile 98 Regency Brougham 3.8L engine rocks on mounts when shifted to reverse VIN: 1G3CW51C8J
This Olds started as broken motor mounts. I know its old but it is a real cream puff. After replacing the front broken motor mounts the customer stated that it had a vibration that was not previously there. We checked and found that there was indeed a vibratio...
1996 Oldsmobile Cutlass Supreme SL 3.1L MIL Lamp on VIN: 1G3WH52M3T
this olds has a mil light with code p0401:insufficient egr flow. there are no diveability complaints. i first removed egr valve and noted typical carbon build-up on egr valve pintle and passages. clean passages and valve. reset computer, after 3 mile drive the... Trouble codes: P0401 (insufficient egr flow)
1991 Pontiac Sunbird LE 2.0L No Start VIN: 1G2JB54K3M
If I touch the distributor rotor shaft with screw driver with ignition key on the coil sparks, when you attempt to start you get one spark and then nothing, replaced ignition module as per diagnostic steps to no avail.
1996 Pontiac Firebird 3.8L Misfire, Poor Fuel Economy VIN: 10TU67O568
she oringally ran out of gas filled ran a few days then engine light came ,brought to me change fuel filter .tryed to clear code comes right back on it still misfires not anough to stall but can feel it doesnt have the power it had before,injector pulse is 3.7... Trouble codes: P300
1996 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire VIN: 1G2NE52T3T
Hi, Techs, thanks in advance...As you can see by the repair history i've been trying anything and everything. This car runs great as long as the RPM is above 1400 approx. At idle it shakes and has obvious misfire issues. On the highway it runs great no hesitat...
1997 Pontiac Sunfire SE 2.4L Ignition switch VIN: 1G2JB5248V
Hi Folks! Got a 97 Sunfire with an ignition switch/shift interlock problem.The key will not turn to lock,but can be pulled out,leaving the warning lights glowing-not the heater or radio,just the warning lights.This of course would drain the battery in no time....

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick Century 3.1L low air pressure light VIN: XXGWXXXJX3
Thank you to all that replied. I am some what embarrassed that I could not figure this out with out help. Several of you suggested that I reset the TPM. The owners manual was not in the car. The owner had it put away at home. Anyway I found out the procedure f...
1967 Cadillac eldorado 429CID head bolts
thanks to all who replied to this post. i got alot of replies on these bolts, we tried arp but i would still have been waiting on the bolts. long story short the manager ended up getting a set of used bolts from somewhere for us to install. special thanks to s...
1994 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1G6KD52B1R
Thanks for all the great replies.I checked the injectors first,I thought that was a pretty good suggestion.I also had already checked the fuel pressure and forgot to mention it in my post.Well a few of you led me to the fix.I removed the ground wires next to t...
1976 Chevrolet K20 Cheyenne 5.7L Misfire VIN: CKL246Z151
Thanks for all your inputs. The majority of you hit it on the head with the suggestion of the valve spring. I removed the valve cover, I noticed that the #3 exhaust valve was weaker than the rest. I removed that valve spring and found it broken. We later found...
1989 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: 2GCEC14K7K
Very quick responses, two in about 1/2 hour. One with the same symptons, injectors firing while engie off [ecm issue fixed it]. I did check the grounds at the housing stud and the connectors at the ecm right off the bat. All said most likely cause would have t... Trouble codes: 42 (ets timing code.).
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L pressure switch in master cylinder VIN: 1G1YY23P2P
six out of the seven replies hit it on the head. WE HAVE A BAD MASTER CYLINDER !!! but david from texas supplied useful information about the theory and operation of the switch and how it operates in the master cylinder. there is a shaft that the sensor needle...
1999 Chevrolet Silverado 2500 6.0L no 4x4 VIN: 1GCGK2911Z
thanks to everyone, fix was the clutches in transfer case were burned up, even though it was new a year ago.
1998 GMC Jimmy Envoy 4.3L Compressor VIN: 1GKDT13W9W
We recieved several good replies on this one, bad connections at the compressor or a/c pressure sensors out of range. Faulty power feed to the control head. Pat & Eric supplied the info that ultimately fixed it. The ambient air temp sensor (mounted beside the ...
2000 GMC Jimmy Diamond Edition 4.3L Excessive Emissions, Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GKDT13WXY
Had to open new help request on this truck today. New plugs and O2 had truck going fine for 2wks 300mi. NNow I have it back and it runs fine for me. Have added more info on new request. Thanks for all the replies. Most thought vac leak, not it. I am leaning to... Trouble codes: P0171 (B1S1 lean), P0300 (multi missfire).
2003 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX54K83
Thanks to all that replied, After leak testing one more time I decided that the problem was intermittant and replaced both the purge valve and pressure sensor with no further reoccurrance so far. Trouble codes: P0440.
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