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Prev Professional Automotive Repair Technical Discussions for September 5, 2007
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Open Help Requests for GM
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1969 Buick electra 225 430CID torque specs VIN: 4B4399H122
i am in the process of rebuilding the motor on this antique. mitckell nor all data admit that anything this old exists therefore I am in need of torque specs for the crank, rods, mains, heads and intake. i also need the torque sequence for the same items...tha...
1992 Buick Roadmaster Limited 5.7L Hesitation, Surge VIN: 1G4BT5372N
Customer complaint of surge at idle and when driving slow from cold start. ALso found no power all the time. Fuel pressure 13 psi at idle, 16 psi with return line dead headed. No change with power when dead headed. Tested fuel volume and less than 1 pint in 30...
1999 Buick Regal LS 3.8L cooling fans VIN: 2G4WB52K2X
Dear Peer , this buick will run hot when sitting still, the cooling fans are running on low speed.When the AC is on they will cycle to hi speed and everything is wonderful , Ac off the fans run on lo speed only never cycle to hi and the temp gage will graduall...
2002 Buick Century Custom 3.1L Excessive Emissions, MIL Lamp on VIN: 2G4WS52J52
I have this 2002 buick century that is running rich long term trim is -25% The O2 sensor and injectors have been replaced The other sensors such as TPS MAP and MAF seem to be operating within normal parameters anyone have any suggestions Help would be greatly ... Trouble codes: P0172
1994 Cadillac Seville SLS 4.6L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G6KS52Y5R
Hi all, the car came to shop a couple months ago with engine stalling problem at the time the engine was running rough, I found the Injectors O rings where leaking, this particular engine has the Injector inside the manifold, also the map,iat and fuel pressure... Trouble codes: P0032 (open manifold absolute pressure map sensor), P0036 (egr valve pintle position out of range), P0071 (interm map sensor), P0095 (engine stall detected)
2000 Cadillac DeVille 4.6L Traction Control VIN: 1G6KD54Y9Y
Car came in with complaint of Traction control light comes on & stays on until next key cycle. Found code 1295 Brake switch circuit open . When testing with scanner all tests ok . Road tests Ok for me. Recommended brake switch replacement (lower -Due to poor...
2002 Cadillac DeVille 4.6L power window motor VIN: 1G6KD54Y32
hello everyone have a interesting one here. the left rear power window is inop, checked the motor it is fine, i can jump it and it goes up and down. so i thought the switch was bad so i swaped it with the R/R made no diference, so then i thought that maybe th...
1994 Chevrolet C3500 6.5L MIL Lamp on VIN: 1GBJC34F8R
1994 Chevrolet Corvette 5.7L No Start, Stall, codes VIN: 1G1YY22P3R
Now has no start, but upon initial scan had code 51 Eprom error but started and ran fine, so i cleared codes and car ran for about 15 minutes and then died. Now it has no rpm from the ecm, among other readings but computer would scan. Went looking for used or ... Trouble codes: 51 (eprom fault)
1996 Chevrolet Cavalier 2.2L self test VIN: 1G1JC5243T
I thank you in advance for any input. -When driving over 30kph this vehicle will continually cycle the abs system as long as the pedal is pushed slightly -It makes the same clicking sound that is heard just after starting the vehicle when the system performs i...
1997 Chevrolet Tahoe LS 5.7L brake booster VIN: 1GNEK13RXV
original problem: hard pedal- booster leaking vac., also master cyl. leaking at resivior. after replacing the booster 3 times and master 2 times there is squeak that appeared after first replacement that is pretty loud. i have bleed, and lubed all i can get to...
1998 Chevrolet Blazer 4.3L intermittent no start VIN: 1GKDT13W6V
Hey guys dont know where to start with this one customer complains of intermittent no start but every time it is broght to the shop starts fine, checked PCM, Checked Grounds,Checked starter just dont know where else to go any help greatly appeciated
1998 Chevrolet Malibu 3.1L cooling fan VIN: 1G1ND52MXW
After having engine replaced, cooling fan does not operate. Replaced cts with a new one, and then a known good one. Scan tool values for cts are with in a few degrees of temp gun reading on cts. In scan tool you can command the cooling fans on both high and lo...
1998 Chevrolet C1500 Cheyenne 5.7L Stall, MIL Lamp on VIN: 2GCEC19RXW
the truck will not start unless you spray the throtle with starting fluid. it will stay running but when you shut it off it will not restart unless you spray the throtle. Trouble codes: P1345 (ckp/cmp correlation)
2000 Chevrolet S10 4.3L Excessive Emissions, MIL Lamp on VIN: 1GCDT14W9Y
thnaks in advance for any hep we get, we have a 2000 chevy s-10 4.3 that came in with a check engine light on, we initialy scanned and had p0172 and p0175 bank 1+2 rich, we checked fuel pressure and it was 60psi, good. while monitoring the scanner we noticed t... Trouble codes: P0172 (fuel system bank 1 too rich), P0175 (fuel system bank 2 too rich)
2001 Chevrolet Lumina 3.1L HVAC Mode doors VIN: 2G1WL52J31
Gentlemen, I have a 2001 Chevy Lumina with inop mode doors. The blower fan as well as the temp controls work fine. The air will only come out the floor and defrost vents. It has a Vacuum/Electric Solenoid located behind the glove box door. I have checked groun...
2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on, OTHER SERVICE LMPS VIN: 1GNDT13573
When the heater fan is turned on the 4wd service lamp, ABS lamp, Brake warning lamps come on and the U1041 code sets when fan is turned on. When this happens, the fan does not come on and the communication with the scanner is cut off. When the fan is turned of... Trouble codes: U1000 (Class 2 serial Comm. Problem), U1041 (Loss of EBCM/EBTCM Communications/with fan sw. on), C0379 (Front Axle Circuit Malfunction), B0790 (Transfer Case Neut. Indicator Circuit)
2004 Chevrolet C6500 Kodiak C6C042 7.2L Cuts out, MIL Lamp on VIN: 1GBJ6C1CO4
I NEED HELD FROM ANY BIG TRUCK OR CATERPILLAR TECH.Well this truck belongs to me,just bought this truck about 2 months ago.I first noticed that one day while on a pull that the truck started to buck and jerk and when I would accelerate it would only run about ...
2004 Chevrolet Trailblazer LS 4.2L Hesitation VIN: 1GNDS13S74
hello and thanks ahead of time for your time. we have this trailblazr that has a hesitation when take off. it acts like it is starving for fuel. it is a dbw trk and my concern is that the dbw moduel is failing. i do not know much about these units sense they a...
2005 Chevrolet Silverado 3500 LS 6.6L rotors VIN: 1GBJK34235
After replacement of parts the rear brakes and rotors worn prematurely within 3k miles. Found that the rear brakes are getting to a temp of 350-400 deg within a 20 mile test drive.Front brakes are at 150 deg. Was told that in some cases the rear brake hoses ca...
1993 GMC K3500 Sierra SLE 6.5L overdrive VIN: 1GTHK33F2P
Thanks in advance, This simple job has eat my lunch, After the engine replacement at another shop the customer complained of high RPM's while driving, I found that the TPS had not been transferred from the original unit. I Install a new one and Still no 4th ge...
1997 GMC K1500 Sierra SL 6.5L No Start VIN: 1GTEK19S8V
Don't know much about diesels. Customer drove vehicle on a 1600 mile trip with no problems. Two days home and it stopped as if the key was turned off.We have no fuel coming out of the injection pump. The PDM is aftermarket from SSDiesel. It was sent back to th...
1997 GMC Yukon SLE 5.7L wheels VIN: 1GKEK13RXV
vehicle on tight turns(parking lot speed) tires skip/drag across the pavment almost like engaged in 4wd,but not.customer has owned vehicle scince new and untill last week neverhad this occur.i have checked front end and found no loose parts(idler arm is even t...
2006 GMC Sierra 3500 SL 6.6L shifting
thanks inadvance for any help you can give me. this is my boss' truck & i rebuilt it so i'm married to it. everything worked fine for first 7,000 miles,but now is throwing codes p05629 (cruise ciruit low,i think),p0827 tap up & down shift circuit low,& u1041 n... Trouble codes: 0562 (cruise control), 0827 (tap up down switch), U1041
2000 Oldsmobile Bravada 4.3L transfer case VIN: 1GHDT13W1Y
this awd bravada came in a couple of months ago w/customer complaining about the shudder while making a sharp turn under 5mph. we performed tsb #99-04-21-005d which called for the blue transfer case fluid #[...] to be used as a flush & then refilled w/using...
1999 Pontiac Grand Am GT 3.4L No Power VIN: 1G2NW12EXX
Hey guys and girls, after I got so much good info from you on my last post I decided to ask for help again. Like I said before I am a Volvo tech and I don't see to many GM cars. I have this Grand Am GT that came in barely running. After my last bout with a GM ...
2001 Pontiac Grand Am SE 2.4L engine VIN: 1G2NF12T31
When I was putting the lifters back in I noticed I had bent a valve. So I removed the head and sent it to the machine shop. The next day the machine shop was closed and they were gone on vacation. So to try and get the car back to the costomer sooner we got a ...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Custom 3.1L Excessive Emissions, MIL Lamp on VIN: 2G4WS52J52
pcm replacement brought long term trim back to reality thanks to everyone for all the help Trouble codes: P0172.
2005 Cadillac SRX 3.6L Cabin Air Filter VIN: 1GYEE63715
Have not changed the filter as of yet. There are some clips that appear to be coming out with the filter and I am not sure if that is correct.
1988 Chevrolet K2500 Cheyenne 5.7L guages VIN: 26CFK24K1J
Thanks to everyone who replied my grounds turned out to be good. I ended up replacing the cluster with a used unit and is working correctly. Thanks for all the help. Ted
1996 Chevrolet Blazer 4.3L air bag VIN: 1GNDT13WXT
Thank You for all the information, I tested the arming sensor and found it to be bad, Thanks again
1998 Chevrolet S10 2.2L engine VIN: IGCCS1447W
some of you guys thought that fuel psi was low but it had checked out ok specs were 41 to 47 koeo,tested at 43, but i could not find a spec for volumn, after pulling the plugs and testing the compression which were at 150 per cylinder,so the only thing that i ...
1999 Chevrolet Silverado 1500 5.3L Hesitation VIN: 2GCEK19T8X
Thanks for all the replies from everyone. The truck is fixed now. We cleaned the MAF sensor and all is well. According to the customer this was supposed to have been done from previous repair facility but apparently wasnt.
1992 Geo Metro 1.0L Poor Fuel Economy, spark knock VIN: 2C1MR6462N
Thanks to all who replied and confirmed several of the things that I had tried. Also confirmed that the Japanese takeout engine was probably carboned up so a decarbonization fixed the problem
1993 Geo Storm 2+2 1.6L Starting VIN: J81RF2369P
Thanks for all the help. We had already done all the obvious that most were suggesting with no change in the draw. The vehicle had a reman alt put on it bout a month ago so on a whim we put a starter on it. It had no affect on the draw, but the car started eve...
1992 Pontiac Grand Am SE 2.3L MIL Lamp on VIN: 1G2NE5439N
Thanks to all who replied. Special thanks to Victor who suggested voltage spikes on the ground wires. Used lab scope and found .25 volt spikes. Spliced in additional ground and used a knock sensor with a 4000 ohm resistance. Trouble codes: 43 (ESC Knock Sensor).
2002 Pontiac Firebird Formula 5.7L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 2G2FV22GX2
The o2 sensor code was fixed by replacing the left front o2 sensor. It looked new but was internaly bad. Now to continue to the idle miss. Next as suggested to retested for vacuum leaks. None found. Then checked PCV valve and found it a dirty and the hose in p... Trouble codes: P0106 (Map or baro out of range), P0134 (Oxygen sensor Bank 1 Sensor 1 slow operation).
2004 Pontiac Grand Prix GT2 3.8L Steering VIN: 2G2WS52204
sorry for the delay in closeing this on this car left for about three weeks then finally returned it ended up being the ignition switch replacement to fix the problem
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