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Prev Professional Automotive Repair Technical Discussions for November 28, 2006
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue Ultra 3.8L PCV System VIN: 1G4CU53L7M
Customer has owned vehicle for several years and had no apparent problems with engine. Recently he was at a quickie lube and was told that his dipstick had popped out and caused oil to drip onto manifold. He said he observed the same results subsequently over ...
1996 Cadillac Seville STS 4.6L No Start VIN: 1G6KY529XT
96 CAD seville STS Crank no start pdl flashing,security flashing vehicle may no start. Radio and heater controls are not working. No cummunication with scanner with BCM are ECM. Checked power and ground feeds performed security relearn. I have no key fob for v...
1995 Chevrolet Caprice Classic 5.7L Stall, Misfire, MIL Lamp on VIN: 1G1BL52P4S
this car missfires bad at startup then is fine when gos into close loop Trouble codes: 18 (injecter circuit fault)
1997 Chevrolet Express 1500 5.7L No Start VIN: 1GTFG15RXV
Hi Techs,i need help! this van was towed in with a no start-was overdue for a good tune up-replaced -cap -rotor-sparkplugs and wires-fuel fiter-still no start-found fuel pressure a bit low-replaced pump,still no run,replaced crank sensor,and hall efect,sprayed...
1999 Chevrolet K1500 Suburban 5.7L Blower Motor VIN: 3GNFK16R5X
Customer states that they can hear the blower motor running at high speed, but no air is exiting any of the ducts intermittently. The customer agreed to let us remove the heater box to check for foreign objects inside and to check all actuators. Found all actu...
1999 Chevrolet C2500 Suburban LS 6.5L No Start VIN: 3GNGK26FXX
hi,I need help on the suv.I check all things you check for a no start. I check on iatn about the suv and someone said, that the injection pump module could be the problem. How can you check to see is it bad.The injection pump unit was replace about 6 m ago.I l...
1999 Chevrolet Malibu 3.1L under intake manifold VIN: 1G1ND52M6X
I noticed a small puddle of coolant at the rear of the engine under the intake manifold. I cleaned it up and put 15psi into the coolant reservoir tank and it dropped to 14psi and held for over 30 minutes and I found no leaks. Took car for a 5 mile test drive a...
2000 Chevrolet Silverado 1500 4.8L No Start VIN: 1GCEC19V3Y
hey guys. i've got an on going problem with this one! cust. complains of a hard start after vehicle had been warmed up on a drive adn then shut down for a short 5 min. period. i have confirmed the complaint. when we first diagnosed the vehicle we had lean code...
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND53J72
hi you all techs, this car cameback for crank no started right away from the tow pcm code but i was able retrieve body codes above.two months ago i duplicated the problem it just cranking no start not start and stall like anti theft.because o... Trouble codes: U1016 (loss of ecu communication), U1040 (loss of abs--ebtcm--tcs communication), B2960 (passlock cylinder data incorrect)
2003 Chevrolet Express 2500 4.8L Misfire VIN: 1GCGG2SV63
Good Morning everyone. We need some help on this one. Came in w/ a missfire code and Po351 coil circuit code. Van needed tune up, all looked original. We did the tune and replaced #1 cyl coil just for insurance. Came back w/ both codes again. We test drove and... Trouble codes: P0300, P0351
2000 GMC C3500 Sierra SL 6.5L No Start VIN: 1GDKC34FXY
Driver got out of truck, it would not run again. The Tech II will not comunicate with engine, transmission or body control module, but you can read data on the Passlock. This U1255 is current and in history. Class DTC check modules VID\EVO DTC's yes. Class 2 ... Trouble codes: U1255 (No communication on serial data line)
2002 GMC Sierra 2500 HD SL 6.6L Hard Starting VIN: 1GTHK29162
This truck has a intermitant hard start, seems to be worse as it gets colder out, i have done nothing to it yet, there is NO check engine light, and once it starts it runs fine, i took this truck out of town this past weekend and it started great when i left, ...
2000 Oldsmobile Intrigue GLS 3.5L Starting/theft system VIN: 1G3WX52H1Y
Car came in and stopped running when it got here with instrument panel light flashing and theft deterrent system light on. Checked for codes and it had a code of B2960 at this time. I replaced the lock cylinder assembly which was worn out, you could pull the k...
1994 Pontiac Bonneville SE 3.8L f.pump-windows VIN: 1G2HX52L2R
The car will not run unless you make a temp. ground in wire going to fuel pump,the windows also will not work untill this ground is made,had simalar car along time ago but forgot were this ground junction is located .I think it is in one of the kick panels but...
1995 Pontiac Grand Am SE 3.1L Cooling Systems VIN: 1G2NW55MIS
car was towed back to shop,would not start,checked and found low coolant,dipstick is way overfull and looks like a milkshake,also oil fill cap and pcv are coated with coolant,removed #6 sparkplug,it is wet with antifreeze,also i can look into that cylinder and...
1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G2JB1246V
As i stated #1-#2 injectors were leaking with a customer complaint of gas smell. Replaced #1-#2 injectors with new ones. Engine automatically developed misfire on #3-#4 Cyc. After a Hmmm. Swapped #1-#2 To #3-#4 Vise-Versa. Engine Miss went to #1-#2. Got two ne... Trouble codes: P0172
2000 Pontiac Firebird 3.8L anti-theft system VIN: 2G2FS22K8Y
I need some info on the vats system on this car. The car has an after market remote starter on it, so I don't know if that has anything to do with the problem. This morning, the customer attempted to start her car with the remote starter, it didn't crank so sh...
2000 Pontiac Grand Prix GT 3.8L Ign.lock cyl/shifter VIN: 1G2WP52K5Y
This vehicle originally was brought to my shop with the complaint that intermittently the key couldn't come out of the ign.lock cyl. because it wouldn't turn all the way to the "lock" position. When this happens I can't shift the car from park. At first I thou...
2004 Pontiac Sunfire SE 2.2L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 1G2JB12F64
Good afternoon friends, I need some assistance with this Ecotech motor. Customer complaint was misfire and MIL. Upon connection of my Tech2 scan tool, I pulled the P0300. I was concerned about the low mileage, so I looked for TSBs. I found the one about the up... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet P30 5.7L 2/3 shift limp mode VIN: 1GBHP32K5S
thanks much to all who replied, most said igniton switch which we did try, to no avail,, after doing extensive research found problem to be internal leak in trans , after so many shifts the computer would see taking too long to shift to high gear and would put...
1995 Chevrolet Blazer 4.3L No Start
its been about 3 weeks now and the blazer has not returned. i called a guy who was a gm service manager and he told me to try a factory ignition i did and that has done it. i have tried 2 different types...a duralast and a borg warner. i noticed that...
1996 Chevrolet Blazer 4.3L heater core VIN: 1GNDT13W8T
Well, good news, I think, (gave car back on Saturday & so far so good). Measured .374V in coolant during cranking. Per one suggestion we added a ground strap from the starter mounting bolt to the frame, this dropped cranking volts to .14V! Replaced heater & ra...
2002 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNFK13Z92
thank you for all the replies, took advise from wayne in florida and replaced the vent valve and bracket with updated part #s [...] respectively. as the problem was so intermittant i waited to be sure this was the fix. Trouble codes: P0449.
2004 Chevrolet Tahoe LS 5.3L running rich VIN: 1GNEK13Z64
well thanks to all that sent me replies i found the fix for this vehicle after a fuel pressure retest i found fuel pressure to be excessive high so i removed the fuel pressure regulator and found it to be restricted with fine dirt so i dropped tank and cleaned... Trouble codes: P0172 (system to rich bank 1), P0175 (system to rich bank 2).
1993 GMC Jimmy SLE 4.3L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy VIN: 1GDCT18Z0P
Replacing the ECM resolve this excessively rich air/fuel mixture condition. After the ECM replacement, I measured the frequency between each injection pulse at 720rpm. It turned out to be at 12Hz. This means that for every 1 revolution of the crankshaft, there...
1995 GMC Jimmy SL 4.3L No Start VIN: 1GKCT18W0S
This truck is still not fixed. Part of the problem is the truck is very intermittant. Replies were useful, but things that have already been checked. Checked TPS for clear flood mode, checked for VTD problem (not even equipped), Powers and grounds to PCM, PCM ...
1989 Oldsmobile Cutlass Calais 2.5L Poor Idle Quality, HARD START VIN: 11G3NL54U7
thanks again everybody for your help .ikeep thinking i wasnt getting enough volume out of the fuel pump decide to replace and and boom the baffle in the gas tank was broke it was moving arond i guess and causing funky stuff to happen car has been with owner fo...
1998 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3H52KXW4
thanks for all your help i did find a melted wire at ground bus were mark from PA said to look thanks for all your replies so far so good hasent come back yet..
1989 Other GM P-30 454CID Unknown VIN: 1GBJP37W5K
Customer took Motorhome For Thanksgiving weekend trip and never heard the noise, as he probably doesn't push it as hard as we did to hear the noise. Anyway he has declined further diagnosis untill he hears more noise from Veh. Replies were very helpfull and ...
1996 Pontiac Sunfire GT 2.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G2JD12T6T
Thanks to all who replied, I'm with the majority and believe that there is also an exhaust restriction, but after the vehicle was repaired the customer chose to take the vehicle and has not returned yet for the back pressure test. The problem turned out to b...
1996 Pontiac Bonneville SE 3.8L Stall VIN: 2G3WE4748T
well this is a new one for me. i guess before i got the car it sat for a while. after pulling my hair out i just started looking around. and to my suprise i found the wierdest thing a mouse or somthing had chewed threw wiring at the right rear corner under hoo...
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