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Prev Professional Automotive Repair Technical Discussions for July 7, 2005
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Open Help Requests for GM
Help Request Answers
1990 Buick Riviera Luxury 3.8L Surge, Cuts out, Misfire
this car has me stumped. origianlly came in for a dieing problem. found coil pack and module melted together. replaced coil and module and all was good for 3 weeks. car came back for a missfire at 2800 rpm and up worse under load. found cam sensor code and mag...
1998 Cadillac Eldorado ETC 4.6L ABS, Steering VIN: 1G6ET1292W
This caddy will set codes C1282 and C1287 Yaw rate sensorbias circuit and steeringsensor excesive rate analog mismatched.Will also turn on service message about stability control. How ever it doesn't do it very consistantly.our experence when it happens slowin...
1989 Chevrolet Blazer Silverado 5.7L Poor Idle Quality, Stall, Leans out at idle VIN: 1GNEV18K5K
The only way to keep the engine idling is to diconnect the timing advance connector or select backup fuel/spark with the mastertech scanner. The engine is leaning out at about 1500 rpm just before it stalls. The timing maks advance normally when the timing is ...
1990 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T4L
Hi i am posting this for another mechanic who owns the shop around the block. We usually help each other out whenever needed. He got this vehicle towed in with a no start. When checked out there was no fuel injector pulse. First he tried a new crank sensor- no...
1992 Chevrolet Lumina 3.1L Excessive Emissions, No Start, Poor Idle Quality VIN: 2G1WL54T8N
Hello everyone, The initial problem I encountered with this car is it would die coming to a slow stop. It would sometimes not start unless you slightly depressed the gas pedal. I replaced IAC and now it does not die, but sometimes it won't start, especially af...
1994 Chevrolet K2500 Cheyenne 5.7L Stall, Misfire VIN: 1GCGK29K3R
this trucks backfires on accelaration. it has no it for 10 to 15 minutes and system never goes into close loop.when checking serial data w/ scanner,truck runs a whole lot has new wires,plugs,dist. cap,rotor replaced by customer. fuel pres...
1994 Chevrolet Caprice Classic 5.7L MIL Lamp on VIN: 1G1BN52P7R
hello, fellow members i have this caprice (impala ss),it has several problem. 1. fans inoperative/ 2. no communication or check engine lite on/ 3. test drove around the block it has no power. here is the situation, this car belongs to a single mother. i am ...
1996 Chevrolet Express 1500 5.0L No Start, Cuts out, Stall, Misfire VIN: 1GDFG15M4T
vehicle came in with an intermittent stalling problem, that wouldnt start up until you gave it a while. customer brought it in and we never had a problem with it for the first 3 days then we had it running again and we must have sneezed on it because it died. ...
1997 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC5245V
came in running for smog ck .failed for ses on above codes ...lowered pcm and did tap/wiggle test unplugged pcm inspect for corrosion none 3 ground under bat major rust. one disconnected clean and connect ... car never started and RAN again ...anti theft light... Trouble codes: P1601, P0118, P0122
1997 Chevrolet Monte Carlo Z34 3.4L engine VIN: 2G1WX12X1V
This vehicle is back with a oil leak that is hard to locate.We have removed the intake and re-sealed the top plate and have installed new o-ring on oil pump drive.Came back leaking again.Today we dis-asm. upper intake and it is soaked with oil in valley area a...
1998 Chevrolet C1500 Cheyenne 5.7L No Start
Have replaced 2 pumps and now three relays. Connector at pump is not burnt or corroded. Does not blow any fuses. Amp draw between 6.5 and 8.6. Cannot find any shorted wires and ground is good at pump. Just keeps burning out relays. Thanks for any help.
1998 Chevrolet Express 3500 LS 5.7L AC System VIN: 1GAHG39R0W
Replaced the compressor manifold hose. 24 hours later not cooling well-lost about 2 cans of 134. We have dye & have sniffed the system with our Yokogawa detector & can not find any leaks. It does have a rear cooling system- factory system, it looks like. Are t...
1999 Chevrolet Cavalier LS 2.4L 1-2 shift VIN: 1G1JF52T6X
This 4T40E trans has harsh 1-2 shift when hot. The shift sometimes feels like a double bump or shudder. All othe shifts feel fine. When activating the pressure control solenoid with the scan tool the pressure is slightly low on the minimum pressure portion of ...
1999 Chevrolet Silverado 1500 4.8L ebcm VIN: 1GCEC14VXX
1999 Chev C1500 Codes = CO265,CO245,CO251,CO246,CO242,CO252 ABS light intermitent,clean and checked for rust at wheel sensors (none found)checked power and ground at ebcm (ok).ABS light comes on intermitently at low speeds under 20 mph and scan tool shows no ...
1999 Chevrolet Blazer 4.3L Hesitation, Surge, Cuts out
OK Techs, Here we go. This was brought to us for lack of power. Test drove to verify. NO Power. This thing starts and idles GREAT! You take it out on the road, it acts like the exhaust is partially plugged. No Codes. Every reading on the scan tool is perfect t...
2001 Chevrolet Suburban 1500 LS 5.3L Poor Idle Quality, Stall VIN: 1GNEC16T31
idles ok with a/c off when a/c is turned on idle drops and surges. computor sometimes shows a/c request most of the time not. can control idle air control with scanner.
1999 GMC Sonoma SL 4.3L Surge, Poor Fuel Economy VIN: 1GTCT14W1X
OK I need some help on this truck,the motor was replaced in this truck because of the man ran it hot until it cut off on him ( has been carry around water to put in because of the water pump leaking and I guess he forgot to add some before this trip)it came fr... Trouble codes: P0410
2003 GMC Sierra 2500 HD SLE 6.6L mil codes VIN: 1GTHK29113
no complaints from client, only mil on
1997 Oldsmobile Bravada 4.3L code po740 VIN: 1GHDT13W9V
Vehile sets a code PO740. Checked fuses and found #24 fuse blown. Replaced fuse and also replaced TCC solenoid and harness. We checked the tcc valve for binding = none. Also checked resistance of TCC pulse width solenoid with a new one and both are identical. ...
1990 Pontiac Grand Prix Mclaren 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out VIN: 1G5WP14VXL
hi!, boy is this car a pain in the @#@#@ss! The problem I seem to be having is related to the fuel injection on this car. Doing noid test, results in a dim blinking noid. I can drip feed car fuel and it will rev up okay, but on it's own it will not rev or run ...
1996 Pontiac Grand Prix SE 3.1L window motor VIN: 1G2WJ52M3T
Customer brought vehicle in with inoperative window. Motor tested bad. Replaced driver window motor. Window would go up but not down. Sent motor out as defect and replace with new motor, same result. What I don't understand is when the motor is not hook up the...
1998 Pontiac Grand Am SE 2.4L instrument cluster VIN: 1G2NE52T1W
Car came in with ABS, coolant, air bag, theft and oil light all on, tachometer not working, temp guage not working. Panel lights, speedometer and fuel gauge working. Not sure if related, but ETS light does not come on when depressed and defroster light not wor...
1996 Saturn SL2 1.9L Belt tensioner VIN: 1G8ZK5273T
Hey all got this saturn in with a rattle from the belt tensioner. I know it is the tensioner because I can push on the center bolt of the tensioner while it is vibrating and the vibration and noise goes away. The noise is only present with the transmission in ...
2001 Saturn L200 2.2L Accessories VIN: 1G8JU52F21
I have diagnosed a faulty BCM. My question is can I reprogram the the new BCM with my Tech 2? I am unable to select Saturn under the prorgramming menu. I can get Saturn data, etc, but no programming options. Alldata calls for the Saturn Service Stall Procedure...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L Engine VIN: 1G4HP52K2V
Got the salavge motor in and got it to fire up and run. Ended up having to transfer the oil filter adapter, the exhaust manifolds,also had to transfer over the throttle body unit(vacuum line setup on throttle bodies are different). Also transfered over the old...
1984 Cadillac Eldorado 4.1L Poor Idle Quality, Sluggish, won't rev VIN: 1G6AL5783E
I got this one fixed today. It turned out to be a bad injector driver in the ECM, one injector was firing properly and the other only a fraction of what it should have been. I found this with a timing light watching the injectors, a noid light and resistance t...
1994 Cadillac DeVille Concours 4.6L Surge VIN: 1G6KF52Y4R
car had oil soaked transmission harness thanks for trying to help me out car now runs very good now Trouble codes: P0047, P0080, P0107, P0137.
1996 Cadillac DeVille 4.6L 4th gear
Sorry it took so long to fix this car. I just wanted to make sure all was correct before putting back in. Performed complete overhaul with convertor. Also all Sonnax updates and new electrical components. All is well. Thanks for the replies.
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L Surge, Misfire VIN: 2G1FP22PXP
Its not fixed yet. I got a little off track because the snap-on scanner said the injector on time was 5ms at hot idle. When I checked the actual on time with the labscope it was half that much. Rechecked with another shops modis it said the same. I do believe ...
1995 Chevrolet Lumina APV 3.1L Fuel pump VIN: 1GNDU6ORT1
hello i would like to thank everyone that took the time to help me out with this one. the problem if fiannly fixed. When the other tech repalced the p/s oil cooler lines that run at the front of the sub frame , i guess he had to move the wiring loom and there ...
1998 Chevrolet Lumina 3.1L A/c fan speeds VIN: 2G1WL52M2W
Thanks to all who replied, I as well assumed a ground of some sort was causing this very strange operation of the speedo - Lo and behold, the culprit was the vehicle's blower motor itself. Installed the 'upgraded' version [same bolt pattern, different look] an...
2004 Chevrolet Express 3500 6.0L Steering VIN: 1GCHG39U14
After rotors where resurfaced shimmie was still in steering wheel while braking.Checked run out on front rotors.Right rotor had .030 run out.Replaced front rotors shimmie is gone.
1990 GMC Top Kick 366CID Excessive Emissions, Poor Idle Quality, Cuts out VIN: 1GDL7H1P6L
Sometimes we get headded in the wrong direction. Had to slow down and and look at individual symptoms. Started with the rough idle. Lets check E.G.R.. No difference with vacuum applied. Remove and it's stuck wide open. Repaced EGR and reset timing. BINGO!!! It...
1993 GMC Safari SLE 4.3L Poor Idle Quality VIN: 1GKDM19W8P
sorry it took so long but I did figure it out with your help it was the two main fuel delivery lines under the upper plenum, thanks again.
1993 Oldsmobile 88 Royale LS 3.8L Misfire VIN: 1G3HY53LXP
Good job group with all the helpful tips. Turns out the problem with this car was a bad injector #2. I replaced the wires and found the bad injector afterwares. But I still had a misfire...reason...two defective wires and or plugs (one plug was leaking at the ...
1997 Oldsmobile Aurora 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G3GR62C1V
Much thanks to all those who took time out to reply;Roger,Bob, Doug &Wadkart.The fix was a blown intake gasket on underside of manifold on runners 5 & 7.It's great to have fellow techs out there that when tunnel vision creeps in they can shine their light in t... Trouble codes: 300 (multiple misfire), 305 (307 -), 307.
1998 Oldsmobile Intrigue GL 3.8L electic windows VIN: 1G3WS52K2W
sorry about the long delay. had to order the part and then had to contact the customer. its was 2 things. the master switch was part of the problem. the other part of the problem for the other window was a short. there is a short under the rear seat it also af...
1995 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE15M0S
thanks for all the help,he declined the work to pull the pan to check the crank.what little we could see looking through a mirror through the crank position hole appeared to be a part of the crank missing. thanks to Alfred [...],I ... Trouble codes: 82 (no 3x signal error).
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