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Prev Professional Automotive Repair Technical Discussions for September 22, 2004
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2000 Buick LeSabre Custom 3.8L p730 VIN: 1G4HP54K6Y
Code P730 sets frequently when driving normally from stop up to highway speeds using drive or OD. Prior to this condition it had codes P730, P1811,PO742. We replaced the pressure control solenoid and valve body. Now just have P730. Gear ratios seem near the lo...
1991 Cadillac DeVille 4.9L Poor Idle Quality, Surge, Misfire VIN: 1G6CD53B9M
weird one here, 4.9 cad dev with erratic idle quality intermitent,surges up and down runs rough,then smoothes out for 5 min or so then acts up again.cked fuel pressure and volume was winin specs, ck egr operation was ok,watching scanner when happening timing i...
1996 Cadillac DeVille 4.6L Instrument Cluster VIN: 1G6KD52Y7T
Vehicle was brought in with the dash display not working unless you turned on the headlight switch. Tried a replacement headlight switch assembly and that did not fix the problem, so before I go after the cluster itself, I thought I would see if anyone else ha...
2000 Cadillac Catera 3.0L abs VIN: W06VR54R5Y
Hey folks. This Catera has the ABS light and the Traction Control light both on, as well as the SES light. I listed the codes. The Snap-On Modis we have will not talk to the trans controller or the EBTCM. Checked all the fuses and they are okay. Checked VSS at...
1966 Chevrolet CORVETTE 327CID headlamps VIN: 194676S119
rec'd from body shop with many lighting problems and of course repairing bad and missing ground connections brought most everything back to life. the only problem now is the indicator lamp on dashboard for headlamp malfunction. all other lights operate correct...
1989 Chevrolet G20 Beauville 5.7L brakes VIN: 2GCEG25H1K
this van came in pulling to the right under braking. front brakes wore out caliper leaking on the left. repair brakes with all new parts van drives good. two days,[...] later van comes back pulling to the left under braking. recheck work all looks good. rep...
1996 Chevrolet C1500 5.7L Misfire, MIL Lamp on VIN: 1GCEC14R8T
please help me on this one guys vehicle came in with po300 code multiple misfires, watching master tech it misfired at idle on #2,#3,and #8 and you can feel the vehicle misfiring. replaced tune up parts and fuel injector system. checked vacuum on engine checki... Trouble codes: P0300
1997 Chevrolet K3500 5.7L front wheel pull VIN: 1GBJK34R1V
Hey Techs , This Truck is eating me alive!!! Truck is part of a fleet but only has one driver. It has a brake pull to the left, cold is only slightly , the more it goes the more it pulls till it will almost make a left turn ,as soon as you release the brake ...
1999 Chevrolet Lumina 3.1L engine VIN: 2G1WL52M4X
Customer brought car in with what sounded like lifter noise. I removed the valve covers and all rocker arms were tight. I started engine and could not feel any rocker arms that were loose with the engine running. Have these engines had a histoy of rod bearing ...
2000 Chevrolet Cavalier LS 2.2L Hesitation, Stall, MIL Lamp on VIN: 1G1JF5244Y
vehicle brought in for hesitation,stall & mil on.customer also mentioned dash cluster will completely illuminate at times when driving. found loose ground at battery tray and repaired.scanned computer, multiple codes found;p1780,p530,p122,p452.fuel pressure at... Trouble codes: P0122 (tps circuit low), P0452, P0530, P1275
2001 Chevrolet Malibu 3.1L prolonger cranking VIN: 1G1ND52J51
This car has a intermitant prolonged crank period,it seem to happen after sitting for no less then one hour.I have left a fuel pressure gage on it and fuel pressure is ok and spark is ok also,the car starts after about 30 sec. of cranking
1991 GMC Safari SLE 4.3L idle climbs in gear VIN: 1GKDM19B3M
engine idle speed increases when engaged in gear - no codes or mil [ forward or reverse ]we tested for vac.leaks - none , grounds, inspected connections,tested iac and replaced ecm , charging system ,idle still climbs to a point you can't press the brake hard ...
1993 GMC Yukon 5.7L back up lights VIN: 1GKEK18K7P
came in 2day, the back-up lights will not go out. checked sockets for short, checked harness under dash, replaced backup switch on the column,pulled the fuses then pulled my poor gray hair. and ideas?ps,bifocals are a bitch under a dash
2000 GMC Safari SL 4.3L Cuts out, Stall VIN: 1GTDM19WXY
Hi everyone! I'm posting this for another shop who has been burned by this van long enough! I got a call today that they had replaced the bcm (after van had been struck by lightning) and needed to have it programmed. I have a Tech 2 and TIS 2000 so I thought n... Trouble codes: P0102
1988 Oldsmobile Cutlass Ciera Brougham 2.5L Hesitation VIN: 2G3AM51R2J
Brought in with complaint of multiple stalls after starting/ followed by backfire-then high rough idle. Quick peek under hood revealed vac. hose to booster off. (I assume this happened when backfire occured-hasn't happened again) Customer stated that they have... Trouble codes: 45 (lean o2)
1999 Oldsmobile Intrigue GX 3.5L scan data VIN: 1G3WH52H5X
We have an odd one here. this car came in for a slipping tranny, we replaced with a reman. the customer came back the next day complaining of it "hunting for overdrive". I drove to verify, and did. with the scanner on the car, the data will stop, and a no comm... Trouble codes: P1602 (serial data failed between pcm and etc module)
1999 Oldsmobile Intrigue GL 3.8L Mechanical VIN: 1G3WS52H5X
I,ve got this 99 intrigue that has a cold start problem.When started cold it runs very poorly, will not accept any gas and smokes badly. The only code present is #410 secondary air injection system malfunction. Is there something I should be leaning towards wi...
1991 Pontiac Grand Am LE 2.5L Misfire VIN: 1G2NE54UXM
I have another Grand Am.. Customer came in with complaint of a misfire from car. He stated it had been a while since he had a tune up. I road tested the car and felt the misfire when the accelerator was hit hard and fast. It was hard to get it over 30 miles a...
1992 Pontiac Sunbird SE 3.1L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy
idles beter but not perfect with o2 sensor unplugged. with os sensor pluged in iac drops to 0 and engine speed increases and than sets a code 35 also sets a code 44 if left idling for a few minutes computer has also been replaced but not by us the car was at a... Trouble codes: 35 (unable to control idle), 44 (lean exhaust)
1995 Pontiac Bonneville SE 3.8L battery gauge VIN: 1G2HX52K3S
This Bonneville is quite odd. From time to time the headlights will dim and the battery gauge will drop to about 12v unprovoked just driving along. BUT When you start the car there is a delay from the time the car starts until the battery gauge gets to 14v. AN...
1996 Pontiac Grand Am SE 2.4L instrument cluster VIN: 1G2NE12T7M
car came in with starts then dies concern. after running through diagnosis I found that there was no voltage to the passlock circuit on lock cylinder from instrument cluster. disassembled cluster to find burnt circuit board. replaced instrument cluster with us...
2000 Pontiac Bonneville SE 3.8L column VIN: 1G2HX52K2Y
Hi people, feel a little silly but don't have enough of a breakdown. Want to lube the steering shaft on this Bonneville with the GM lube kit. I don't have access to dealer info on which way to pull this column and where to seperate(except for the instruction s...
1997 Saturn SL1 1.9L No Rev or 2nd VIN: 1G8ZH5281V
Have this Saturn MP6 Auto just hardly moves in Rev sets code P0732 for no 2nd gear if put in manual 2nd it will start out in 3rd in manual 3rd or 4th will start out in 1st and skip to 3rd when makes its first shift. It will hardly pull off in reverse. I have t...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR54K6Y
Recieved 3 replys one stating the abs computor may be the culprit. After driving the vehicle could not get the proble to return. Called vetronix rep and he suggested relearnling the key in the pass key. Didi relearn and problem has not returned. So far so good... Trouble codes: C1298 (PCM loss of communications), U1016 (class 2 Loss Of communication), U1255 (class 2 Loss Of communication), P1602 (PCM loss of communications), P1626 (Security malfunction).
1991 Cadillac DeVille 4.9L No Start VIN: 1G6CD53B7M
hey y'all.well, most said to check the pellet and the 2 white wires. well i did and the ohms were the after i saw the 5 volt fuel enable at computer i decided to go with a used ecm. well, the car starts and runs woooohoooo!!!enough to make a person go ...
1997 Cadillac Seville STS 4.6L abs VIN: 1G6KY5292V
this one went out the door without a fix. thanks ray from ontario for your your testing information i disconnected the wheel speed sensors at the ebtcm and ohmed each sensor individually while pulling on the wires in different places, no problem found there, i...
1998 Cadillac Catera 3.0L tcm VIN: W06VR52R5W
Hello Fellow Technicians, This car has not had a recurrence of the trans going into default third gear since it first arrived. I drove the car over the weekend and no problems arose. As for the O2 sensor code, the sensor was removed and found to be covered w...
2002 Cadillac Escalade 6.0L front and rear diff VIN: 1GYEK63N02
big thanks to colby07. the test you sent was the ticket. after performing the viscous coupling test, the transfer case was replaced resulting in a fix. big thanks to everyone who helped.
1993 Chevrolet Caprice Classic LS 5.0L temp sender VIN: 1G1BN53E7P
Hi guys thanks for all your help.I ended up removeing the rad.and sending it for flow test and came back we bypassed heater befor replaceing it.with the heater bypass temp stayed still.just under 1/2.we drove it around for 2 days to make sure the gauge...
1995 Chevrolet K2500 6.5L Excessive Emissions VIN: 1GCGK29F0S
Sorry no news about this one. It is a construction truck (the boss) and has had no time to return with it. Thanks to the three replies. I will repost at a later date. He did add that it is starting to jerk going down the road. I guess we'll see what developes....
1995 Chevrolet S10 LS 4.3L Fuel Gauge VIN: 1GCCS19Z5S
Hey All: I want to thank everyone for their input for my problem. I installed another dash cluster and the gauge is working as it should now. Some suggested that it might be loose tank baffles but all you really had to do was rock the truck a little ...
1997 Chevrolet C2500 Cheyenne 5.7L speed sensor signal VIN: 1GCFC29R2V
only got 3 replies- 2 were for older non-vcm systems with speed buffer behind glovebox- other said to test sensor on trans & test it's wiring which we already did- will update if we get any further on this diagnosis- thanks!!!
1999 Chevrolet Astro 4.3L abs VIN: 1GNEL19W0X
Hi there and thanks for the good responce, I have not had vehicle return as of yet(but the client will be back in and I will be able to add fix), we had checked the rear sensors on the van, I had a good responce on checking the integrity with weight of vehicle...
1996 Geo Tracker 1.6L Misfire VIN: 2CNBE1360T
We would like to thank everyone that replied to our post for help. It was suggested that perhaps the timing was off due to a sheared crank keyway or the distributor shaft being bent. the timing belt was checked for proper fit and the timing itself was right on... Trouble codes: P0340, P0300.
1998 Other GM VT 3.8L Starting
Well I am calling this a fix customer got a new key from dealer and so far it has not been a problem,so fingers crossed it's a fix,many thanks to all those who replied.
1986 Pontiac Firebird Trans Am 5.0L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2FW87F8G
Thanks for all the help, ended up being MAF. Tapped on sensor and numbers went crazy. Install new sensor and it ran fine. Trouble codes: 42 (Electronic spark timing).
1990 Pontiac Firebird 3.1L starts and stalls VIN: 1G2FS23T7L
After replaceing the timing chain that had about 20 deg. of play in it the car would run but VERY badly. We decided to try a new ecm and that made alot of differance but still had a major miss in it. after cking all the injectors with a noid light we found tha...
2000 Pontiac Bonneville SE 3.8L 1-2 shift VIN: 1GACRT1234
Customer left with options of epc solenoid and or valve body. Since he's been gone, transmission has given no problem. Here is what I left out: before returning car to customer I rechecked trans fluid level. It was high. I must of not checked level when it was...
2001 Pontiac Grand Am GT 3.4L unknown VIN: 1G2NW52E31
Thanks to everyone who replied. I thought at first that it could of been a hub bearing noise, but after further inspection and the help I got, it is the tires. GM service bulletin #02-03-10-003-issued june 02 addresses the problem with the goodyear tires and...
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