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Prev Professional Automotive Repair Technical Discussions for July 3, 2009
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L 1/2 shift VIN: 1G4AG55M4T
Vehicle has a hard shift after 1/2 shift. TCC applies early in second gear. I have tested for the codes, has P0742, P1812 and P1870(Transmission over temp condition and Transmission component slipping).** The transmission was replaced back in February of this ...
1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL1299P
Hey guys, Customer came in with a high idle problem all the time. Scanned for codes. DTC P030 - Idle speed control RPM out of range. Engine idles at approx. 1,500RPM all the time. Checked for binding cables, throttle etc, and found plunger on ISC motor fully e... Trouble codes: P0030
1995 Cadillac Eldorado 4.6L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G6EL12Y5S
Here is one I already wish I'd never seen...pre-OBDII Caddy with drive problems...yuck! According to the customer, the car sat for sometime, in a garage, until the current owner inherited it. No knowledge of why it was parked. Since the current owner got it, i... Trouble codes: 56 (transaxle input speed sensor), 52 (pcm historical), 109 (pcm historical)
1997 Cadillac Seville SLS 4.6L compressor VIN: 1G6KS52YXU
Covered all basics for caddys. made repairs to bad componets above.disconnected battery. If you ground pin 27 on ecm(green w/white to relay)compressor comes on. pressures are good,no acm codes,no body 27 is relay ground.Thought ecm was problem,but sa...
1998 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCS13W2W
replaced leaking fuel pressure regulator for hard to start problem and fixed that . next day set system too lean codes . cleared pcm of codes and unhooked battery for 5 min. to see if computor just need to adapt to repair. no help. tried mass air flow no help.... Trouble codes: P0171, P0174
1999 Chevrolet K1500 Suburban 5.7L Poor Idle Quality, Misfire VIN: 1GNEK13R13
have a problem mil p0300.i checked misfire data ,cyl#4 a lot of multiple misfires.have a misfire on cyl#4 and runs rough at idle,above 1,500 rpm runs smooth and no cyl#4 misfire detected on scan tool.i had replaced the intake gasket,injector#4,cap,rotor,wires,... Trouble codes: P0300
2005 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13T55
Have this 05 tahoe from body shop. will not start cranks over fine. They drove it into bays then did body work now will not run. truck hit left frt corner. I have a U1000 code always current in IPC, BCM, SIR, ABS, ONstar, ACM. All other modules no codes. I rep... Trouble codes: U1000
2007 Chevrolet Equinox LT 3.4L tpms VIN: 2CNDL63F67
Hello GM techs. We put new tires on this vehicle. Being careful not hit the sensors. Even took tires off 1 at a time. Now tire pressure light is on. Display shows R.F. 1 lb., L.R. 2 lbs, & R.R. 19 lbs. We performed relearn with key fob & pressure drop procedur...
2002 GMC Sierra 2500 HD SL 6.6L Poor Idle Quality, MIL Lamp on, lack of power climb VIN: 1GTHK23182
The customer's complaint on this truck is a rough, rolling idle and black smoke along with a lack of power when climbing a grade and of course the MIL is on. I checked the actual versus desired FRP regulator and they mirror each other for the most part. The fr... Trouble codes: P0089 (Fuel pressure regulator performance), P0101 (MAF sensor performance), P0404 (EGR open position performance), P0540 (Intake air heater feedback circuit), P1093 (Fuel rail pressure low during power enrichment)
1999 Oldsmobile Alero GL 2.4L Hesitation, Stall VIN: 1G3NL52TXX
Please help. This car stalls intermittently when coming to a stop. I looked at it last week, could not duplicate problem. There ate no codes, datastream looks OK. Air filter OK. Alt charges fine. A/C cond fan operation OK.I cleaned the throttle bore and IAC. T...
2000 Pontiac Bonneville SSEi 3.8L 3-4 shift VIN: 1G2HZ5410Y
tranny techs please help,this veh is my buddy owns a trans shop and assisted/told me what to do on the rebuild. 4t65e replaced clutches,torque converter,valvebody with rebuilt one and 4th gear cookie cutter.problem is we have no 4th gear.the comput...
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B02
Hi all and Happy 4th July. Have this Saturn Vue, with check engine light on and also reduced power light on. Clear all codes and within seconds P0638 resets. Short drive and P0700 nd P2119 and P02101 appear. As long as reduce power light stay off, this car is ... Trouble codes: P0638 (tac command performance), P2119 (throttle closed position performance), P0700 (transmissioncontrlo system fault), P2101 (tac error)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac DeVille 4.6L Alternator
Thanks to all who replied. Especially Juan,John,and Shaharazad who guided me to the right area. Once the alternator that matched up to the oem number was installed, the car still would not charge. Before the radiator was installed, I re-tightened the 2 pin co...
1999 Cadillac Seville STS 4.6L almost all electrical VIN: 1G6KY5495X
hi. thanks to everyone for their help. it was the used cluster that kept it from starting. now i can fine tune this monster. again, thanks to all...andrew
1995 Chevrolet Lumina LS 3.1L Battery VIN: 2G1WN52M8S
First off I would like to thank Lester, Michael, James, Rodney, Mark, Matt, Cecil, Bill, Dave, Steven, Rick, Richard, and Larry for taking the time to give me a hand. Well here is what I found out. First my Fluke meter was leading me astray, there must be an i...
1998 Chevrolet Malibu LS 3.1L compressor VIN: 1G1NE52M8W
well this one is fixed. hate when i start barking up the wrong tree. Turns out the schematic on alldata does not show that a/c fuse also runs auto headlights, so i was thinking that we had a short. just had a bad clutch coil replaced coil and all is ok. thanks...
1999 Chevrolet Tahoe LS 5.7L Soft Pedal VIN: 1GNEK13R3X
Thanks to all that helped, too many to respond via email. IATN is a valuable resource I'm glad I found it, but you have to know how to separate the doggie do from the icecream. There was something stuck in the ABS, as some members told me.Even though I bled it...
2000 Chevrolet Prizm 1.8L Hesitation, Cuts out, Stall VIN: 1Y1SK5487Y
The MAF was extremely dirty with a black coating. The vehicle stopped stalling and hesitating once it was cleaned, BUT the check engine light came back on a week later with the PO300 random mix-fire. Since the problem is very intermittent once per week I and... Trouble codes: P0300.
2007 Chevrolet Silverado 2500 HD Classic WT 6.0L wipers VIN: 1GCHK29U37
thank you for the help the fuse blew so little average once a week so I put in a used wiper motor on spec been gone since posting hasn't blown again customer happy
2003 GMC Sierra 1500 4.8L gauges VIN: 1GTEC14V43
Thanks guys but i never got a chance to try the battery cables. customer took it to the dealer and they found the instrument panel bad and ordered one. hes getting covered under warrenty . im picking up the labor part. Next time ill take my time charging up ...
1992 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH549XN
Found that the coolant temp sender and engine coolant temp sensor were wired together in series.Also found exhaust to be restricted. Thanks for the help everybody. Trouble codes: 26 (quad driver problem), 53 (info flag esc exceed max valvue).
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