GM Automotive Technicians Technical Discussion and Fixes for Dec 14, 2006

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Riviera 3.8L Poor Idle Quality, Stall, Misfire VIN: 1G4GD2211S vehicle appears to be running extremely lean. we have replaced the fuel pump twice as mitchell calls for 41-48 psi. first was remfg pump. second new from dealer (oe) no change in pressures, still around 30 psi. there is no fuel leaking at regulator. when propa...	View
	1996 Buick Roadmaster Collector's Edition 5.7L Level Control VIN: 1G4BT52P7T We are working on a 96 Roadmaster Automatic Level Control system (air shocks). The customer is concerned because he hears the system run when in his garage during the night. We have repaired the high pressure leak, and the system does not run that we can tell ...	View
	1999 Buick Park Avenue 3.8L trunk VIN: 1G4CW52K4X this vehicle when sitting for at least ten minutes will pop the trunk when opening any door. i have disconected the interior switch with no change. any else have similiar problem? thanx in advance. mike	View
	1999 Buick Regal LS 3.8L e brake VIN: 2H4WB52K4X THANKS FOR TAKING THE TIME TO READ THIS REQUEST CAR CAME IN TO MY SHOP AFTER FAILING SAFTEY INSPECTION E-BRAKE WILL NOT HOLD I REPLACED THE E-BRAKE SHOES THEY LOOK LIKE A HORSE SHOE NOW I HAVE FOUND THAT I NEED TO REPLACE AN ADJUSTER OR A CABLE ON THE Right RE...	View
	2002 Buick LeSabre Custom 3.8L column VIN: 1G4HP54K32 This vehicle exhibits an intermittent noise in the column, a light squeaking when turning. I replaced the clockspring and the customer said it seemed to help (I really don't think it did). While listening to the column with a stethoscope the noise seemed to be...	View
	2002 Buick Regal LS 3.8L Hesitation, Surge, Stall, Misfire, MIL Lamp on, HARD START VIN: 2G4WB55K62 this regal runs like your pulling a truck behind you when going down the road, at idle it wont run unless you have your foot on the gas and it starts hard mean while the whole time its running its bucking and skipping.snap on scanner shows that every cylinder ... Trouble codes: P0131 (o2 signal low b1 s1), P0300 (random misfire), P0403 (egr solenoid signal out of range), P0404, P0405 (egr sensor a signal short/low)	View
	2000 Cadillac Seville SLS 4.6L Stall VIN: 1GSKS54Y9Y the customer says the car has stalled 4 times in the last 10 days. we installed a used engine in the car about 9000 miles ago. the car has ran fine until now. all of the codes i listed are in the fail since clear not history files. ther aren't any current code... Trouble codes: P0101, P0125, P0335, P0338, P0741, P1599	View
	2003 Cadillac CTS 3.2L Stability Control VIN: 1GGDM57N73 Car came in with complaint of "Stability Control Activated" on information screen. At same time cust notices that a slight braking action and pulling to the left when this message occurs. It did occur on test drive just as customer stated. I retrieved a histor...	View
	1996 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS19W2T Towed in, cranks fine but no start. Fuel pump sounds noisy. New customer, no service records. As mentioned, fuel pressure is only 20 PSI, should be 35-40 according to information provided by Mitchell. A noid light reveals no injector pulse either. CPS has volt...	View
	2001 Chevrolet Astro LS 4.3L No Start VIN: 1GNEL19WS1 Hello, This astro was towed in as a no start. I could hear the fuel pump cyle and run. Pulled the dog house and checked for spark. Has good strong spark. Checked fuel pressure and I only have 14psi. I can release the pressure thru the pressure gauge while pump...	View
	2002 Chevrolet Silverado 1500 HD LS 6.0L abs VIN: 1GCGC13U62 Thank you for reading this long post. We have this truck that while stopping, the abs in momentarily activated. Using the Tech 2 we can see the wheel speeds all almost exactly the same. In play back, the rear iso valve command and rear iso valve feedback chang...	View
	2003 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCCS19X83 vehicle came in with the check engine linght on check for codes ecm display two code 171 bank 1 lean condition 174 bank 2 lean condition i check all the vacuum hoses on the engine no hoses were broken or unplug also check canister hose for fuel nothing, check ... Trouble codes: 171 (bank 1 lean condition), 174 (bank 2 lean conditionfue)	View
	2004 Chevrolet Express 2500 LS 6.0L hydro boost VIN: 1GAGG25U74 Customer complaint, "brake pedal sticks, and we have to lift up on brake pedal to release brakes." The concern might occur once or twice in a two week period. We were not able to verify complaint. The first time the vehicle was the customer requested "try some...	View
	2005 Chevrolet Equinox LT 3.4L cvjoint VIN: 2CNDL73F65 see repair history	View
	2003 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, MIL Lamp on VIN: 3GKFK16Z23 This car came in with lean codes for both banks and a MAF sensor code. The sensor was clearly bad and was replaced.The MAF sensor code does not return, however the lean codes do. The car is running very lean. The long term fuel trim is at 25%. The fuel pressur...	View
	2001 Oldsmobile Bravada 4.3L ebcm relay VIN: 1GHDT13W11 Hello, this 01 Bravada is back in for an intermittent DTC C0265, EBCM relay ckt. Last time in (just as this time) the light was not on and did not come on during the test drive and the code is in "history" only. I found some info concerning grounds so I cleane...	View
	2001 Oldsmobile Aurora 4.0L MIL Lamp on hello all, This car came from the body shop today with the check engine light on.The car was hit hard on the right front.The car runs fine.I have cleared the codes and syncronized the crank sensors.the misfire come back instantly on cyls 2,3,5,and 8.They are ... Trouble codes: P0300 (random misfire)	View
	1985 Pontiac Firebird 2.8L Hesitation, Surge, Cuts out, Stall VIN: 1G2FS87S2F basically people , i have a erratic cutout at all speeds , loads, sometimes a one time cough, and other times multiple coughs. no codes, cannot pickup any sudden errors on scanner . did notice that there is no reading on spark advance replaced the est connect...	View
	1996 Pontiac Firebird Formula 5.7L Cuts out, Stall, DIES HOT VIN: 2G2FV22P3T Dies hot, no rpm reading on scanner, no spark, good square wave from crank sensor to pcm (ckt573), no ignition control signal (ckt 423) between pcm and ignition module. Examined distributor harness and connections- all satisfactory. Power at dist. ign. feed ck...	View
	1994 Saturn SL1 1.9L power steering pump VIN: 1G82ZH559X Hi everyone. I am looking for some advice. 94 Saturn Came in with a slight leak from front of power steering pump. I got a reman unit & installed. It was real noisey. Called & got another. Pump is nice & quiet but Very hard to steer. Ordered a pump from dealer...	View
	2003 Saturn Vue 2.2L ratio cntrl mtr circuit B1 VIN: 5GZCZ33D33 vehicle came in with P1885 ran the test from alldata. it said replace TCM problem still exsists. since vehicle was in an accident and hit in that area we replaced the valve body. which is part of the ratio cntrl motor. also while driving vehicle it felt like e...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52L5S Thanks for all the good tips. The battery side-terminals looked ok from the outside but when removed were very corroded. Someone replaced the battery but never cleaned the terminals. We cleaned the cables and replaced the terminals and have not had the stallin...	15
	1996 Buick Regal Custom 3.8L tape player VIN: 2G4WB52K6T All the replies concerning the error code 10 were correct, the tape drive is bound. Unfortunately, repairing this as many indicated is too costly when used are available for a reasonable amount. I did remove the upper and lower covers to see if the tape was ac...	7
	1995 Chevrolet S10 2.2L Poor Idle Quality James & Jerry hit the nail on the head !!! I checked the green & white wire on the Ignition module for 5 volts and had nothing. I replaced the module ( with new AC/Delco ) and the 5 volts are now there and it runs great !!! A BIG THANKS TO ALL WHO REPLIED !!! Trouble codes: 41 (1 x signal error).	6
	1996 Chevrolet Cavalier Z24 2.4L Misfire, MIL Lamp on VIN: 1G1JF12T5T Well, loads of info from everyone here and I, and the other shop, thanks you. After advising them to replace the distribution cap with a factory unit I actually had to stop by their place of business and have a for look myself. They insisted that they had repl... Trouble codes: P0300 (Random Misfire).	14
	1996 Chevrolet C1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEC19M7T Sorry guys, no exciting fix for this truck. I replaced the module with a 2nd new delco unit as suggested and the code and mil are now gone. However I took the time to check A/C voltage output and scope the pattern. The A/C voltage was within the same range, bu... Trouble codes: P1351 (ic circuit high voltage).	3
	1997 Chevrolet Astro 4.3L drl VIN: 1GNEL19W6Y well-fixed---found diode behind b pillar/behind driver's seat/behind seat belt retractor. It's in a very large heat sink. what I discovered is that this diode is more of a voltage regulator. the lights work at 11 volts. changed the diode but still had a flicke...	3
	1998 Chevrolet Venture 3.4L Unknown VIN: 1GNDX03EWD well the customer decided not to go any further with this repair the noise is not bad enough at thie point. i had alot of good responses but none seem to pan out. the exhaust pipe and converter seemed to be ok i ck'ed the purge solinoid bracket on the bake sid...	9
	1998 Chevrolet Lumina 3.1L Cuts out, Misfire VIN: 2G1WL52M6W Tried a new PCM, no change. New coils and ignition module, no change. Tried a new 7X crank sensor, the one in the block, and that did the trick.	5
	1999 Chevrolet Silverado 1500 5.3L cooling/engine VIN: 2GCEK19T7X Well, I put the cylinder heads back on, after getting them back from the machine shop, which they confirmed were ok. (still kind of doubtful about too). Put the heads back on, pressure tested the system with drain plug out and saw nothing of a leak. So far so ...	15
	1999 Chevrolet Malibu 3.1L under intake manifold VIN: 1G1ND52M6X Sorry about the delay, this one is fixed. The lower intake maifold gasket was blown out at the rear of the engine. I used the updated gaskets from GM with the steel tabs to keep from overtorquing. I also installed a new 'O' ring in the distributor hole althoug...	60
	2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND53J72 hi all tech, thank you all for the responds,unfortunately I have to close this without a fix. the owner took the car when he learn that it's running and will bring it back when it happen again. the majority of the replies said BCM and passlock cylinder.I will ... Trouble codes: U1016 (loss of ecu communication), U1040 (loss of abs--ebtcm--tcs communication), B2960 (passlock cylinder data incorrect).	11
	2002 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GND18W82K ck circuit 9 and 49 for continuity, ok,ck for loose or poor connection, ck for frequency with lab scope thur wire, none, replace knock sensor Trouble codes: P0327.	5
	2002 Chevrolet Trailblazer LS 4.2L compressor VIN: 1GNDT13S32 I checked the pcm ground, then I sent the truck out to another shop that has a Tech 2 to ck for HVAC module codes and to reflash the pcm with the latest updates.They also cleaned the throttle body and the truck is fixed. The strange part for me was when the ...	12
	1998 GMC C1500 Sierra SL 4.3L Cooling Systems VIN: 1GTEC14W6W Well we're still not sure of the cause but after flushing the cooling system with Tide detergent (a trick picked up from diesel class) and refilling the system with red coolant we now have good heat and flow. Hopefully it lasts. Thanks Houskas	15
	1999 Oldsmobile Alero GL 2.4L Poor Idle Quality, Stall, Misfire VIN: 1G3NL52T1X first of all thank you to all who responded to this request for help. after many tests... replaced map,cam sensors.tps and the spark plug tower which was cracked causing a misfire the problem did not improve. took off the timing chain cover and the chain guide... Trouble codes: P0300.	11
	1993 Pontiac Grand Am SE 3.3L ebgine oil VIN: 1G2NE15M9S Technically not fixed, but the fix is apparent(sp). These intake gaskets that normally leak externally on the 3.1 will also leak internal and cause oil consumption. Other thoughts were that the 3.1 will use oil at 75,000 miles. We will do an intake reseal AND ...	12
	2000 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB1245Y Thanks for all the help. I assumed since the machine shop did the head it was done right. After many responces about valves, I leak tested the head and found valves not seating. There was a mistake made on the valves. It is apart and being remachined , right t... Trouble codes: P0300.	11

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