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Prev Professional Automotive Repair Technical Discussions for September 1, 2006
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Help Request Answers
1997 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K3V
We have swapped injectors, coils, plugs and wires. Running compression shows around 80 psi on good cylinders, only 50 psi on affected cylinders. I'm leaning towards a cooked engine, but others remain unconvinced. Any ideas would be appreciated. Trouble codes: P0300 (Random Misfire), P0304 (Cyl 4 Misfire Severe)
1993 Cadillac Seville 4.9L rear end VIN: 1G6KS52B7P
Hitting potholes on road, rear end feels like it moves over, Ive installed suncore industries coil over shocks in rear, replaced independent suspension bushings to frame to no avail Im thinking replacing the upper bushings that hold the suspension to body next...
1994 Cadillac Seville SLS 4.6L Excessive Emissions VIN: 1G132A12Q3
Hello techs, This vehicle stinks real bad especailly during warm up. I have no access to Gas Analyzer. Plug in my Soulus, o2 readings around .900v when cold til warm up. Then switches real fast .200-.800 (havent seen anything this fast). Also spark advance -20...
1996 Cadillac DeVille 4.6L engine VIN: 1G6KD52Y5T
hello i have a leaky caddi seems to be crank case carrier..i have pulled one already for head gasket repairs..is this somthing to shy away from and run? and if not,is it cut and dry pull appart and put back together with new gaskets and seals or are there hidd...
1999 Cadillac Seville SLS 4.6L magna steer VIN: 1GBKY5498X
STEERING SERVICE LIGHT PROBLEM: I cleaned and flushed power steering fluid light came back replaced rack and pinion service light comes back replaced ABS computer still get a P1241 magna steer malfunction according to data screen. checked electricity continui...
1982 Chevrolet K10 Custom 5.7L Steering/Suspension VIN: IGTEK14HXC
Hi All, I have an early model Chevy 4x4 1/2 ton that has a large lift kit (10"+/-)Straight front axle and 39.5" Mickey Tompson tires. My customer came in with a concern that the front end is going to come out from under the truck. After a test drive I confirme...
1991 Chevrolet G20 Chevy Van 5.7L No Start VIN: 1GBEG25K9M
Hi Techs, I have a 1991 G20 Conversion Van with a 5.7L with a no start condition. She was towed in from another shop who just can't fiquire her out. So, I have it now. Bottom line is: 1- Check Engine Light Inoperative. 2- No Injector Pulse. Engine has good spa...
1997 Chevrolet Camaro 5.7L Starter VIN: P8V2141862
This camaro has an intermittent no start condition. The starter has been replaced twice before (AC Delco). Its a couple of years old but the car only has about 3000 miles since replaced. Sometimes turning the ignition switch to crank does nothing. A quick turn...
1999 Chevrolet Tahoe LS 5.7L Excessive Emissions, Poor Idle Quality VIN: 1GNEK13R9X
this tahoe runs perfect cold for 8-10 minutes then loads up to the point it looks like a diesel out the exhaust, no codes , the injector pulse width get longer and longer, at start it is at 2.6-3.0 when it loads up it up to 6.0, tps stays at .51v, coolant read...
1999 Chevrolet Blazer 4.3L blend door VIN: 1GNDT13W9X
Thanks for taking the time to read this, I have this 99 Blazer with a blend door that is stuck on hot. Everything else works, the vacuum motors and the blower motor. I only have a snap-on scanner and cannot pull any codes from the hvac system. I am almost cert...
1999 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG39R9X
truck came in with an engine missfire both at idle and under load. Secondary ignition was worn out so we did a maintenance tune up on the truck including cap, rotor, plugs, wires and filters. After tune we still had idle miss and fuel trim was high on right ba... Trouble codes: P0300 (Random Missifire)
2000 Chevrolet Silverado 1500 4.3L Starting VIN: 2GCEC19W6Y
The customer tells me that about once a month this truck will not start. The truck has to be jumped and once it is running the gauges jump around for a few minutes. It is then OK for another month to six weeks. I cannot comunicate with the PCM but I think I ha...
2000 Chevrolet Impala 3.4L Starting VIN: 2G1WF55E6Y
This Impala has an intermittent no crank but at times everything works fine. The starter is not receiving a signal when the car acts up. I tested the 3 fuses that seem to be related to the control side of the starting system, the BCM/PCM/CLSTR, BCM, and STOP f...
2003 Chevrolet C4500 Kodiak C4C042 6.6L Misfire VIN: 1GBC4E1163
Hey all you Duramx gurus, I need some help here. We have this c4500 service truck that was dumping fuel in the oil. It has warranty up to 100,000 miles, so we sent it to the closest medium duty truck dealer in our area. They replaced all 8 injecters. When we p...
1988 GMC C1500 Sierra SLE 5.7L Cuts out, Stall VIN: 1GTDC14K5J
This is a truck that has passed around the shop and now it is my turn. Truck idles great and accels great going down the road but when you are coming to a stop or truck speed is around 15 mph it cuts off. When it dies you can crank it right back up. twicwe it ... Trouble codes: 43 (est spark problem)
1994 Pontiac Bonneville SE 3.8L abs VIN: 1G2HX52LXR
This Bonneville has both, ABS and Traction control lights on continuously. All fuses check out. There is no ignition power to the control module. From my schematics, this should be powered from the main relay. The main relay has live power and ignition power b...
2001 Pontiac Grand Prix GT 3.8L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G2WP52K61
Vehicle originally came in for transmission complaint. Reflashed computer, which fixed the original complaint, but now we have a new problem. After sitting for at least 4 hours, the car will hesitate and surge slightly when taking off from the first stop sign ... Trouble codes: P0440

Fixes & Summaries for GM
Fix/Summary Answers
1991 Cadillac DeVille 4.9L Cooling Systems VIN: 1G6CD53B8M
Thank you all for responding. BUT I am upset at the fact that most of the 15 replies were not even focused on my real problem. I stated pretty clearly that I had oil in my cooling system NOT water in my oil. Special thatnks to Scott who responded with personal...
1994 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6KD52B2R
FINALLY!! the problem was a leaking intake manifold gasket. we had to use our smoke machine to find the leak. It was causing a lean missfire that caused our high hc & co readings. Thanks to all that replied, we would still be pulling our hair out if not for IA...
1994 Chevrolet Lumina Z34 3.4L MIL Lamp on VIN: 2G1WP14X2R
First, thanks to the folks that replied to this post. The problem was what I suspected but couldn't confirm with any great level of confidence. The reply concerning the TCC circuit on this car prompted me to test drive again while noting transmission/transaxle... Trouble codes: P1640 (Quad Driver Fault intermittent), P0740 (TCC Error history).
1997 Chevrolet K2500 Suburban LS 7.4L hard start VIN: 3GNGK26J2V
Most of the replies pointed toward the pressure regulator. Although we put a piece of clear hose on the regulator and saw no fuel, we changed it anyway. Seems to be the fix--no complaints from the customer. Thanks again to all who responded.
1997 Chevrolet S10 4.3L Hesitation, Surge VIN: 1GCDT14X7V
Hey guys thanks for the help, sorry I didn't have time to reply earlier. The truck is fixed,I broke the 1-2 solenoid re installing the pan. Thought it was jacked up enough but I caught it just right bent and broke it. I've done hundreds of these... just a rook...
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13W21
this was an easy fix but information is keept by dealership. a .10 shim must be install in front of crank sensor for clearance after this your will be able to perform crank relearn. also note that my tach was also crazy needdle will jump high during normal acc... Trouble codes: P0101, P0335 (crank pos sensor circuit), P0341 (cam pos sensor circuit).
2003 Chevrolet Express 3500 LS 6.0L a/c lines VIN: 1GAHG39U03
Hello everyone, This van is repaired and out the door. I appreciate all the responses on this one. I chose to replace rather than repair this line due to the fact it was leaking in two places where the lines go through the rubber clamps. The a/c line set c...
2004 GMC Sierra 1500 SLE 5.3L brake pedal VIN: 2GTEK19T14
The pedal feel was greatly improved by removing the shim on pad backing plates. Shims were visibly raised or 'springy'
1996 Oldsmobile Cutlass Supreme SL 3.1L cooling system VIN: 1G3WH52M4T
Thanks everyone for your help on this one. I had many replies like checking for cracked heads, bad head gaskets, coolant fan integrity, plugged rad, and so on. Turns out my greatest fear had come true- the engine had simply overheated and cracked a head. A goo...
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