GM Automotive Technicians Technical Discussion and Fixes for Sep 20, 2006

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	Help Request	Answers
	1989 Buick Electra Park Avenue Ultra 3.8L 1-2 shift VIN: 1G4CU54C6K Got this 4T60E that I rebuilt a year ago..ran fine for 15,000 miles until customer said it began leaking oil out the left axle seal. Customer replaced seal, still leaked. He had it brought to me. I found that it is not shifting out of 1st gear...just 1 and R. ...	View
	2002 Buick Rendezvous CX 3.4L SDM module VIN: 3G5DA03E02 vehicle came in with no AC clutch activation, scan all modules and found BCM comm. fault and no AC apply when demanded, (AC pressures OK)tried to ground AC request at HVAC control, BCM would not turn on compressor. replaced BCM reprogrammed with tech2 AC works...	View
	1967 Cadillac eldorado 429CID head bolts need help finding head bolts for this old caddy. believe them to be 13/32 with a 16 thread pitch. can not locate them anywhere. also have torque of 115 ft. lbs. is this correct? any help would be greatly appreciated. thanks.	View
	1991 Cadillac Seville 4.9L transmission VIN: 1G6KS53B0M thank you in advance for any help with this vehicle. the customer state that when vehicle is at a stop or on initial accell the car will have a bad miss almost like somthing is shuting off and the car will then be in nuetral and the engine will just rev after ...	View
	1991 Chevrolet K1500 Cheyenne 5.7L heater VIN: 2GCEK19K9M Posting this for a co-worker. Here is HIS email to me: "My truck is making a gurgling sound coming out of the heater box when at running temperature. It gurgles as I slow down at stops and the intensity slows with engine RPM as though it is rushing through a...	View
	1993 Chevrolet Lumina 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2G1WL54T1P Check engine light stays on continously. There are several other misc. codes not listed. Most of the history codes are different than the current codes. Cannot clear any of the codes. Most data parameters are fixed with the sensors plugged up or unplugged. TPS... Trouble codes: 43 (esc problem), 53 (voltage high), 23 (iat low), 25 (iat high), 21, 22 (tps low high), 86 (internal ecm problem a/d error)	View
	1994 Chevrolet Lumina APV 3.1L No Start VIN: 1GNDU06DXR This problem is not constant, only occurs after hot soak, starts and stalls a few times before it keeps running. Starts better with foot on accel slightly.Runs well, most of the time it starts well not. Very hard to get it doing it and pinpoint the problem. th...	View
	1995 Chevrolet Blazer 4.3L Poor Idle Quality VIN: 1GNDT13W8S VEHICLE STARTS FINE COLD, AFTER HOT SOAK OR IF SITTING OUTSIDE WHEN TEMP IS ABOVE 60. Vehicle cranks a while then when it starts idle is rough and missfires for a few seconds. No codes has the following new parts cap,rotor,wires,crank sensor,tps sensor,replace...	View
	1995 Chevrolet Camaro 3.4L Poor Idle Quality, Hesitation, Misfire VIN: 2G1FP22S8S Hey GM techs. I have this Camaro that has a dead hole on #2 Cyl. Coil and wire are firing. Compression is good. For some reason the computer is shutting down the #2 injector driver. The injector ohms to 12.9 ohms. I haven't tested the other injectors, but it o...	View
	1996 Chevrolet S10 LS 4.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCCS14X6T been to 2 different shops and here we are. when first started engine is somewhat smooth for about 10 seconds and then it picks up a multiple cylinder missfire. under a load it becomes real bad on cylinders 3,4,and 6.the only code showing up is po300. all tune ... Trouble codes: P0300	View
	1998 Chevrolet Express 2500 5.7L starting system VIN: 1GCFG29RXW customer brought vehicle back with intermittent no start,cheked everything previously done by me, no problems found.after putting lots of time into this problem, found out that by moving wires on top of ignition housing van would start fine.so, we replaced ign...	View
	1999 Chevrolet Silverado 2500 6.0L no 4x4 VIN: 1GCGK2911Z customer complait is 4x4 doesn't engage. hooked up tech ii, no codes, push button works properly, all positions seems to function ok. vehicle bucks back and forth when turning on cement only in 4x4 as if axles are engaging, but when customer hooks to water wag...	View
	2000 Chevrolet Blazer LS 4.3L abs VIN: 1GNDT13W0Y Customer brought the Blazer in complaining that the ABS light comes on intermittently plus when you do a hard brake the brakes get choppy with vibration and sometime after this the pedal will go to the floor and barely stop the vehicle. She took the vehicle to...	View
	2000 Chevrolet Malibu LS 3.1L Misfire VIN: 1G1NE52J7Y customer came in with complaint that the car was missing and that the a/c had been repaired at the chevy dealer. when i drove the car with the a/c off the car ran fine with no missing or unusual condition. when i turned on the a/c now the car has a miss that i...	View
	2004 Chevrolet Suburban 2500 LS 6.0L recirculation door actuator VIN: 3GNGK26U34 Customer complaint not cold enough. Checked pressures, noticed low side would not go below 50 psi (hi side 250) Electric rad fans on hi speed with good flow thru condenser. Scanned HVAC & got B0229 recirc door actuator feedback circuit out of range. Verified r...	View
	2005 Chevrolet Silverado 2500 HD 6.6L Radio VIN: 1GCHK23235 I am have a customer's vehicle and have checked all the usual wiring connections. This client has gone to local Chevy dealer and they could not figure out a solution so it is back in my shop. The problem started when the customer romoved radio from dash to che...	View
	1995 GMC K2500 Sierra SL 6.5L No Communication VIN: 2GTFK29S9S Help! This truck will not communicate with my Scanner. I am useing the Snapon Modis. It will talk with the ABS, Airbag, and trans, it just will not give me any codes or data. I have installed a new PCM from GM, swapped over the PROM, but no luck. Jumping A & B...	View
	1995 Oldsmobile 88 Royale 3.8L Poor Idle Quality VIN: 1G3HN52K7S This vehicle is running rough and surging at an idle. This all started after the vehicle came in with a no start. The engine had been overheated due to the upper intake manifold had been damaged by the stove pipe causing coolant to leak into the engine and in ...	View
	2000 Oldsmobile Bravada 4.3L 1-2 Shift VIN: 1GHDT13W2Y This vehicle belongs to one of my oldest customers so I am attempting to do whatever it takes to get this taken care of. The complaint is intermittentaly after the vehicle gets warm (operating temp) it will have an extremely harsh shift from 1st to 2nd. This d...	View
	2001 Oldsmobile Aurora 3.5L engine VIN: 1G3GR62H71 Transmission was overhauled by transmission shop for shifting problems. Vehicle has a vibration at around 1500 rpm +/- 200 rpm. Customer claims that the vibration was not present before the transmission problems. The vibration feels similar to a misfire. The b...	View
	1989 Pontiac Bonneville SE 3.8L Cuts out, Stall I got a new one on me. 1989 Bonneville 3800 VIN C, vehicle came in on hook, customer states car stalled and would not restart for about 5 mins. He didn't trust it so he had it towed. I of course drove the it, hot soaked it and could not duplicate the symtom. W...	View
	1993 Pontiac Grand Prix LE 3.1L MIL Lamp on VIN: 1G2WH54T2P I have a MIL light on with many codes and strange data. The codes come back instantly when I try to clear them. I have 10-16 codes at a time. Some stay some disappear on their own. EST code,TPS code, System voltage high,System voltage low, MAP code, ECM error ...	View
	1997 Pontiac Grand Am SE 3.1L Theft VIN: 1G2NE52M4V Theft problem pull code P1629. Check powers and grounds for ignition switch 12 volts -ok. Check yellow reference wire out of instrument cluster 4.9 volts - ok. Ignition lock cylinder has been replaced twice. ( GM cylinder )Is there a better way to check instru...	View
	2000 Pontiac Grand Prix SE 3.1L radio VIN: 1G2WK52J6Y Not a radio guy so I need help. The digital clock and the radio station now playing will not light up.	View
	1996 Saturn SL 1.9L Misfire, MIL Lamp on VIN: 1G8ZF5281T Seemed pretty straight forward, have seen numerous misfire codes on dohc 1.9's but this is the first sohc. customer let car sit for 3 years! Wants to bring it back to life. Found bosch platinium plugs, replaced with ngk. Replaced wires as well (delco). I have ... Trouble codes: P0300	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Century Custom 3.1L neutrals at stop VIN: 2G4WS52M5X hello all and thanx for the help. we tried a few things and did some tests and found we what we figured was a leak. either a oring or seal. after reading all the tachhelp decided the best bet was to replace with a rebuilt unit. it went out the door and has bee...	9
	1986 Cadillac DeVille Touring 4.1L Stall, RUNS FOR 2 SECONDS VIN: 1G6CD6984G Customer declined further testing. I realised after posting, this car didn't have theft deterrent. I saw a set of keys with the pellet that made me consider this. Anyway, I strongly feel the computer is the issue. Trouble codes: 53 (missing ignition signal).	4
	1999 Cadillac Escalade 5.7L kEYLESS VIN: 1GYEK13R1X Finally fixed this thing. Tried one more BCM, and after install acted like the others, but after a few attempts it did go into reprogram mode. Programmed both transmitters and all works as it should. I'm not convinced I had two bad brand new BCM's before this ...	8
	1999 Cadillac Escalade 5.7L starting VIN: 1GYEK13R1X Thanks to everyone who replied to this request. The vehicle is not fixed yet, but it is because the customer has not authorized the repair. There are multiple problems with the steering column that if all were repaired, it exceeds the price of replacing the co...	12
	2002 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS54Y02 Ok, techs,this isn't a fix but I will tell you what transpired. According to Identifix, the KOEO fuel pressure is 41-47 and KOER pressure should be 3-10 lbs less. Most all replies agreed that there was probably a restriction in the return line. I reinstalled t... Trouble codes: P0172, P0175.	10
	1986 Chevrolet Corvette 5.7L power light motor VIN: 1G1YY0785G Thanks for the help. After opening up the motor I found that the wiring had worn through and had shorted the power to close the light. I repaired the wiring and the motor now works proper. With the stripped gears it is still slipping at times so I've ordered n...	7
	1988 Chevrolet Corvette 35th Anniversary Edition 5.7L temp gage VIN: 1G1YY2183J Thanks to all who replied. Most everyone said it was somewhat normal. We did replace the radiator cap(thanks to Butch for reminding us of the basics)as it was only holding 13 psi. That seemed to delay the temp time considerably and it maxed out at 128 deg. We ...	17
	1991 Chevrolet Astro CL 4.3L Stall VIN: 1GNDM19Z0M As I stated in my request for help, when I disconnected the timing connector the van idled fine. Many of the members who responded thought it was a distributor problem, and were correct. We removed the distributor from our 1991 S-10 service truck and installed...	29
	1994 Chevrolet S10 2.2L Excessive Emissions VIN: 1GCCS1447R thanks every one to give me all the info,egr did kill the engine when it was pulled up, o2 was working fine, the problem was with pin in ecm lose and not sending the signal to egr solenoid to apply vacuum to open the egr valve.	9
	1997 Chevrolet Express 1500 5.7L steering pump VIN: 1GBEB25K2M Well thanks for all of the responces.We found after extensive checks that the o-ring on the new EVO sensor was on the top groove and when we installed it onto the lower groove, where it should've been, the power steering pump worked like a champ. Thanks again ...	9
	1998 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 0574323589 thanks for all the suggestions that led to the fix of the astro van idle problem. evidently the problem was the gap between the crank sensor and the reluctor ring on the crankshaft. we had installed an aftermarket timing cover. replaced that with a oem cover a... Trouble codes: P0131.	12
	2000 Chevrolet Silverado 1500 5.3L Pedal, Master cylinder VIN: 2GCEK19T1Y Finally have this one on the road again with the ability o stop in a reasonable distance. After having a GM dealer bleed with a Tech2 and still having the same exact problem, we took everything mechanical apart. All working except the valve that the abs module...	13
	2001 Oldsmobile Alero GX 2.4L security VIN: 1G3NK12T91 Thanx for all the replies, at first , there was no r code. After replacing battery, the customer took the car . She called yesterday to say the car hasnt acted up yet, but the security light came on for one ignition cycle, she says, but did not come back on. I...	11
	1997 Pontiac Bonneville SE 3.8L Hesitation, Surge, Misfire VIN: 1FTEF14N5K hey guys thanks, she hasnt brought car back so anymore test will have to worry about later on.thanks agian Trouble codes: P0300.	11
	2003 Pontiac Grand Prix GT 3.8L abs light and track light on VIN: 1G2WP52K33 this vehicle had a problem talking with my mastertech.(i have never run into this befor ?)i also found ONE BAD conntion at the fuse box. that was adding power to the engine rpm wire to the ebcm. fixed all of that and the mastertech still wouldn't talk to it. i...	4
	2004 Pontiac Sunfire SE 2.2L no compression VIN: 1G2JB12FX4 thanks all for your help I was not able to talk the coustomer into a complet tear down. The car was just not worth fixing. It was going to cost more than the car was worth to make the repairs. However it was the timing chain. I am sure that it was due to the...	20

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