GM Automotive Technicians Technical Discussion and Fixes for Feb 24, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1984 Cadillac Fleetwood Brougham 4.1L Excessive Emissions, MIL Lamp on VIN: 1G6AW6987E Car came in for service engine light on. Found code 45. car is running rich at idle & cruise. O2 readind is staying at about 930mv. the lowest it has gone is around 700mv. All sensor readings including MAP, MAT, Coolant Temp, TPS all seem good. Tried A good us... Trouble codes: 45 (system rich)	View
	1990 Cadillac Seville 4.5L no heat VIN: 1G6KS5338L ok - I'm sure I'm overlooking something but I have no coolant getting to the heater core. The heater core is new / the thermostat is new - the waterpump is ok - when we disconnect the inlet hose to the heater core while the engine is running there is no fluid ...	View
	1994 Cadillac Seville SLS 4.6L Poor Idle Quality, Stall, Hard start VIN: 1G6KS2YXRU This car came to us with the complaint of hard start first thing in morning when it first cranks it will almost start. Second atttempt sometimes it will start and run rough for a few seconds and die sometimes it will clear out and run. I know this is an old Ca...	View
	1996 Cadillac DeVille 4.6L tcc VIN: 1G6KD52YXT car has a p0471 code for tcc slip speed error. we did a trans flush but code returned. after flush master tech shows slip speed at +120 plus. mitchell says it should be -10 to -64 . passed code on two drive trips,but code returned. after longer drive home. th...	View
	1975 Chevrolet Camaro 5.7L column bearings VIN: 1S87HSN523 3-4 weeks it comes back with the top bearing plastic cage broken & the ball bearings scattered. I have been using later model bearings (mid 80's) because I had several in stock, but they seem to fit every bit as good as the original one that came out. Maybe th...	View
	1995 Chevrolet Lumina 3.1L head Hi ladies and gents, Got a 95 lumina here with a blown head gasket, My question is, do you see alot of head cracking on this engine? The engine wasn't driven very far after the problem was noticed. The gauge was driven up to hot and shut off. After the episod...	View
	1997 Chevrolet K1500 Cheyenne 5.7L Dump valve VIN: 2GCEK19R0V Truck came in with low pedal. Front brakes look good and we adjusted rear brakes. We pressure bled system and still low pedal. We found pin coming out of dump valve on side of ABS unit. What I want to know is if I change the combination valve which has the dum...	View
	1998 Chevrolet K1500 Cheyenne 5.7L Park Lamps VIN: RBT11W0256 This truck came in with complaint of not being able to shut off the parking lights. I got in the vehicle and could smell a burning electrical smell with no smoke. I removed the headlamp switch and the park light remained on (dash lights included). I have check...	View
	1999 Chevrolet Silverado 1500 4.8L Hesitation, low power VIN: 2GCEC19L9X This pickup came in with low power when off idle, on stall test (hold in the brake and floor it ) RPM reaches 600 and has no pulling capability engine only has 10% load. on the road when WOT there is low power until it reaches 1000 rpm and anything over this i...	View
	2000 Chevrolet Blazer LS 4.3L Unknown VIN: 1GKDT13W6Y As always , this is a weird one.This blazer seems to take fits of not wanting to downshift when coming to a stop .At least that is what it feels like.The tach will bounce between 2000 and 1000 RPM and sort of lug along until it goes past 40 kph or so then it s...	View
	2001 Chevrolet Suburban 2500 8.1L No Start, Stall VIN: 3GNK26G11G My main question is does anyone out there have a scope pattern of the crankshaft sensor on one of these engines? The problem is the engine will die without any warning and start right back up. It set a crank sensor code and I have a scope hooked to it trying t... Trouble codes: P0335 (Crankshaft Position Sensor Circuit)	View
	2003 Chevrolet Suburban 1500 LS 5.3L Red brake light VIN: 2GNEC16Z63 Hello all, need a little help on this one. This truck was brought in from a local body shop after repairs for front collision damage for front end alignment and ABS light on. ABS light was due to right front wheel speed sensor open circuit, found one wire cut ...	View
	2001 GMC Safari SL 4.3L master VIN: 1GKDM19X32 Thanks for help in advance. This car came in with a falling pedal. Felt like a master bypassing. I replaced the master, with the same results. Thinking I had a defective master, I replaced again. Did the exact same thing. I've bled at least half a gallon and s...	View
	2002 GMC Yukon SLE 5.3L 4wd VIN: 1GKEK13Z92 Hi Techs, This Yukon came into the shop with the 4WD engaged in 4low.It would not come out of 4low. We were advised(by the dealership)to disconnect the battery and hopefully reset the TCCM. We did that and it worked for a few kilometers. At start-up all of th...	View
	2000 Pontiac Grand Am GT 3.4L valve train VIN: 1G2NW52E6Y Hello have this grandam which sounds like loose valve adjustment, at idle sounds ok bring up rpm to around 1200- 1400 rpm sounds like it is coming apart. Seems to only be rear head. Checked oil pressure, ok, 40psi good man. vac 20 in. and steady. Have pulled r...	View
	2002 Saturn SC2 1.9L moonroof VIN: 1G8ZY14712 Hey all you Saturn Techs! Got this 02 SC2 in and the factory power moonroof doesn't work. It tries to work and it moves just a little bit and siezes up. Dropped the moonroof (what a job!) removed the motor and the cables. The problem seems to lie with the trac...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick LeSabre Limited 3.8L abs light on VIN: 1G4HR53L3N Thank you for all the help,we reviewed all the replies and added in our pinpoint testing,we then doubled back to check all circuitsthat Duane had suggested for code 45.we advised cust that we would need to first replace a defective pmvassy as it was shorted ou...	9
	1994 Buick Park Avenue 3.8L tcc VIN: 1G4CW52L4R It's fixed.. We replaced the two solenoids and PCM as several suggested. It did not help. After talking to the customer and doing some more research I found out that the trans the customer had installed had a 2.84 ratio and the old trans was a 3.06 ratio. I ta...	11
	1975 Chevrolet C30 Cheyenne 7.4L valve train VIN: CKY145F426 After hearing about all the possibilities, I came to the fork in the road. Tore it back down and found that I had slightly bent push rods and more worn lifters(cupped). Best that I can Tell is rockers must have been zero lashed upon first crank. Sorry for all ...	27
	1986 Chevrolet S10 2.5L No Start VIN: 1GCBS14E8G thanks to the replys on this vehicle, 21 in all, after checking most the stuff that was recommended. we went back as if the customer had never touched the vehicle , which was one of the replies. we found that the new coil,even though it produced spark to the c...	21
	1990 Chevrolet Corvette 5.7L No Start, Cuts out, Stall VIN: 1G1YY2385L Thanks to all that replied; I know your time is valuable. No fix with this mess. Broken, mis-routed & improper wiring are just a few of the sins. No serial data exchange between the CCM & the ECM appears to be the reason for the injector shut down. Why? I won'... Trouble codes: 43 (Electronic Spatk Control).	12
	1998 Chevrolet Express 3500 5.7L distributor gear VIN: 1GCHG39R2W i replaced the dist. gear but dont know why it wore.thanks for the help.	7
	2000 Chevrolet Astro 4.3L fuel gauge,abs lamp,oil gauge,mil,check gauges , VIN: 1GKMD19W1Y well i finally had this safari van act up the power feed out of the ign switch the culprit . thank's to all who replyed one of ya hit it on the head , it was hard to get vehicle to produce the complaint . again , thx mick [...]	6
	2000 Chevrolet Blazer LS 4.3L Passlock VIN: 1GNCT18WOY Received a few replies on this Passlock problem. I had to replace the ignition switch and lock cylinder at the Chevrolet dealer. They programmed the required software into the new units and the problem seems to have been resolved. Thanks for all your help. Bob	9
	2001 Chevrolet Silverado 2500 6.0L Rear seal VIN: 1GCHC23U71 Thank everyone for all the replies. We borrowed the tools from local dealer, worked like a champ. We also replaced rear cover and intalled new bolts. (Revised cover with shorter bolts)	9
	2000 GMC Savana 3500 6.5L Cuts out, Stall VIN: 1GBJG31F4Y most people said a injection pump or a electronic pump driver,we installed remote mounted electronic pump driver,they daid it was for pickups,but we made a bracket to mount to the van,works good thanks for the help	14
	2002 GMC Yukon Denali 6.0L pump VIN: 1GKFK66U52 After going over all the information received the replies pointed toward the 4x4 being enguaged and/or faulty. When I got the oppertunity to investigate I found that the transfer case fluid was burned Dexron-III. I serviced the fluid with GM Autotrack-II fluid...	28
	1994 Oldsmobile Cutlass Ciera 3.1L Misfire VIN: 1G3AJ85MXS vehicle was finished 2/23/05. Thanks to all responding members. Problem turned out to be cam position sensor. Do not ask me why only in Park/Neutral!!! Theory is perhaps sloppy timing chain? There were NO trouble codes! Vehicle finally ran poorly enough to all...	11
	1994 Oldsmobile Cutlass Supreme S 3.4L timing belt VIN: 1G3WH55X8R thank guys i have order the tools for the job and with your input i should be o.k thank again and wish me luck.if you need any help with a mazda or jaguar call on me .thank again j.b. [...]	9
	1997 Pontiac Bonneville SE 3.8L Mechanical VIN: 1GHX52K7T4 most of you were right replaced plugs, engine came to life and ran just fine.i had removed plugs 2-3 times before but no luck.new plugs was the ticket. thanks again paul.	25
	1999 Pontiac Grand Am SE 2.4L Service Vehicle Soon VIN: 1G2NE52T1X Thanks for all the responses. This BCM is not programable and has to be replaced when you get a configuration code. Installed new BCM and no more code. Trouble codes: B1001 (Option Configuration Error).	4
	2000 Pontiac Grand Am GT 3.4L Misfire, MIL Lamp on VIN: 1G2NV52E1Y Thanks very much to everyone who responded. As it turned out,the injectors on the #3and #4 cylinders were leaking after turning off the vehicle.Leaking enough to cause the misfire condition. I cant believe weve never seen this happen after doing so many intake... Trouble codes: P0300.	18
	2000 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5277Y The SL2 ses light still has not come on. Thank you all that responded. When it does return I was told to pay close atention to the fuel tank preasure sensor, posible updated harness for the FTP sensor. Trouble codes: P0442.	5

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