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Professional Automotive Repair Technical Discussions for December 27, 2007 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1978 Cadillac Seville 5.7L No Start, Cuts out, Stall hello! this wonderful caddy has come in for a hard/no start cold. most of the time you can start it and it will idle for about 2 second then die. if you start it and start pumping the throttle it will run but very badly, it pops back through the intake like it... |
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| 1996 Chevrolet Blazer 4.3L Transmission shift VIN: 1GNDT13W7T Scanner reads that the truck is going 15,000+ MPH. The speedometer always reads correct. But the scan tool (OTC Genisys,3.0) reads differant. When setting still the scanner is at 0, as soon as you start to move it's at 800 MPH, and by the time you hit 60 it's ... |
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| 1998 Chevrolet K1500 Suburban LS 6.5L engine VIN: 3GNFK16R6W heyb guys got this suburban came in with miss and using water found head gskt blown advised customer at present mileage head gskt was arisk he did not want to go for engine put two reman heads on vehicle 3000 miles later spins arod brg tell customer only optio... |
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| 2000 Chevrolet C2500 5.7L posi I am attempting to tear apart the rear diff for a pinion bearing type noise. I found some type of posi-traction unit with rotating weights and clutches; how do I get the axles out? |
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| 2000 Chevrolet Silverado 1500 5.3L No Start, Stall VIN: 1GCEK10T4Y Plese do not respond as this is a fix to help others as I couldn't find the help earlier. Vehicle towed in for no start. Truck would start at times, start and stall other times. Scan PCM, code P1626 with no codes in any other modules showing up with Solus Pro... Trouble codes: P1626 (Theft deterrent fuel enable signal lost Do not mistake for P1629) |
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| 2002 Chevrolet Trailblazer LS 4.2L t/case ECU VIN: 1GDNT13S62 When we first started looking into problem we were not able to get data at all. We followed mitchells diagnostic no code testing and found good powers and grounds and also scoped the data from body controler to transfer case ecu and found data stream coming fr... |
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| 2002 Chevrolet Silverado 1500 HD LS 6.0L MIL Lamp on VIN: 1GCGK13U02 GOOD MORNING ALL. I"M GETTING A FLASHING SES LIGHT ATFREEWAY SPEEDS. P0 300 CODE SET. MISFIRE COUNTERS SHOW CYLINDER NO#5,8 HIGH COUNTS #6 ONCE IN A WHILE. THE CHECK ENGINE LIGHT DOESN'T EVER STAY ON. AT IN TOWN DRIVING UP 55mph LIGHT NEVER COMES ON. ENGINE SE... Trouble codes: P00, 300 (random misfire) |
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| 2003 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on, Lean Condition VIN: 1GNFK16Z63 After replacing uel pump and filter, vehicle came back with same codes. LTFT is 11% bank1 and LTFT is 13% bank2. Checked for vacuum and is good (18hg") Truck has no misfire. No TSB's and Did the whole troubleshooting tree according to Mitchell. Everything Chec... Trouble codes: P0171 (Always Lean Condition Bank 1), P0174 (Always Lean Condition Bak 2) |
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| 2005 Chevrolet Aveo LS 1.6L no start VIN: KL1TD52645 tow to me,, boyfriend installed battery, reversed pole.. has no spark,, noid, or fuel pump.. powers to ecm ok,, grounds to ecm ok... HAS NO SES LIGHT WITH KOEO,, but has dim SES light while cranking.. replaced ecm.. no change... dose not have theft deturent mo... |
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| 2007 Chevrolet Express 3500 6.6L cleaning VIN: 1GCHG39697 Where can I get information to give my customer about what to expect when the cat begins it's self clean process. The owners manual doesn't mention it, the in cab placard is very vague and Mitchell has nothing to say. Can the cycle be aborted and resumed etc. |
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| 2000 GMC Jimmy SLE 4.3L pcv valve VIN: W9Y2256446 Vehicle has received routine service from my shop. It has developed a "chattering" noise that was found to be coming from PCV valve. This was replaced by aftermarket valve. The "chattering" improved, but is still present. The noise is similar to a rattle. Any ... |
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| 2000 GMC C6500 7.4L MIL Lamp on VIN: 1GDJ7H1D5Y I have installed a GM reman engine in this truck, and it starts and runs great, but after a short drive it runs terrible at the next stop sign, then comes out of it and runs great again. my snapon scanner is not equipped for heavy trucks, but is reading a code... Trouble codes: P0336 (ckp sensor out of range) |
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| 2003 GMC Yukon Denali 6.0L MIL Lamp on VIN: N/A After replacing the O2 sensors the cust. said the MIL lamp come on and then goes off when they drove it on the highway. Last time it come into the shop the MIL lamp was on and the code was reading P0171. I have checked for evac leaks leading to the intake. Trouble codes: P0171, P0174 |
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| 1999 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G2WJ52M3X Take off and it runs fine. Slow down and come to a stop and it won't take off, acts like it is missing real bad yet everything stays good on the scope and pressure gauge. Has erratic Idle at this time. Shut it off leave it set for a minute or so and it is fine... Trouble codes: P1106 (MAP sensor ckt. intermittenly high) |
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| 2002 Saturn L100 2.2L Misfire, MIL Lamp on VIN: 1G8J554F62 it's dad cars, ans have misfire on 2 cylindre,check spark plus ok,change spark plug #2 wih #1 ans misfire stay on cylinder #2,check for corosion in boot dans module pins ok put electrical tape on boots #2 ans misfire stay on drive i did a balance test ok.i hav... Trouble codes: P0302 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2000 Cadillac DeVille 4.6L dash display VIN: 1G6KD54Y7Y Well the customer picked up the car and has not returned. Had many replies to replace the IPC asymbly or exchange it for one from GM. Also had a suggestion that the dimmer switch might be bad, but the customer has not returned. I need to get the car to act up ... |
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| 1986 Chevrolet K5 Blazer Custom 5.7L No MIL Lamp VIN: 1G8EK18LXG Thanks for the replies. I replaced the Check Engine lamp with a 194 bulb and the lamp driver module again. I now have a working Check Engine light and communication to the ECM!!! |
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| 1996 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19W6T WOW , talk about getting help!!! Thanks to all that replied. I checked all the things that people asked me to check , and yes there is slack in the timing chain, the fuel pressure is great. The fix was the distributor!!! There was ALOT of play in the shalf. T... Trouble codes: P0300. |
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| 1997 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W4V hi thanks for all the great advise and help it was the spider injector replaced with new all is well.thanks for all the help. jim |
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| 2004 Chevrolet Silverado 1500 5.3L module VIN: 1GCEK19T24 ERIC FROM MICH NAILED IT! TCCM WAS REPLACED AND WHEN WE WENT TO TRY IT, NO COMMUNICATION! WHEN WE FLASHED THE MOD IT HAD 4 UPDATES, WE LEFT THE NEW PART IN. BUT AFTER THE SMOKE CLEARED WE WEREN'T SURE IF THE MOD NEEDS TO BE REPLACED! FLASHING THESE THINGS NEED... |
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| 2004 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEC13T64 thank you again for the help. the valves are not adjustable. I removed the cylinder head and poured water into the intake. the valve started leaking. removed the valves, the seats were not machined. had a valve job done again on both heads. reinstalled heads.... Trouble codes: P0300 (random cylinder missfire detected). |
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| 2005 Chevrolet Silverado 2500 HD 6.6L reverse VIN: 1GCHK23255 Thanks for all of your time and help. A big thanks Terry, He was right on. What I did was replaced the PRND switch, cause all said I was a problem on these trucks, but that did not fix the problem. As Terry said to check powers at the TCM connector, at th... |
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| 1998 GMC Sonoma SLE 4.3L transfer case VIN: 1GTDT19X7W Code # 2 did set again, but our power & ground were good. The transfer case would not go into 4 whl high, just 2 whl to 4 whl low & not always into low. We replaced the transfer case motor with another new one from GM & all problems went away. This was sugges... |
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| 2004 Oldsmobile Bravada 4.2L lack of acc light VIN: 1GHDT13S04 Well i have to call this one fixed as of right now...the customer has had this back for almost two weeks and the problem has not re-occured. we replaced the APPS again and tightened all connections at the plug in. This was so intermittant we could never catch ... Trouble codes: P2138 (1-2 corolation). |
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| 2003 Pontiac Grand Am GT 3.4L abs code c1226 VIN: 1G2NW12E03 This car was fixed. The problem was a WHITE BOX hub/sensor assys that obviously during replacement were fraying the thin core wire at the base where it went into the assy. itself. Finally isolated it after replacing the harness end. Installed a Timken bearing ... |
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