Motor shut down
This is a discussion on Motor shut down within the General Help forums, part of the LSx Technical Help Section category; My son just acquired a voluntary repo '97 SS. When buying a car out of a repo lot before it ...
02-19-2008, 10:35 AM #1
Motor shut down
My son just acquired a voluntary repo '97 SS. When buying a car out of a repo lot before it goes to the auction block you only have the opportunity to listen to it run and cannot take it for a test drive. It had a slight misfire so we figured it was in need of a tune up and thorough look over. At the price (4k)you can't be too picky. Anyway, It was low on fuel when we picked it up so we filled it up and drove it home. Later that evening he went for a ride and the vehicle shut down about the time it was shifting into 2nd. It started right back up and and ran decent the rest of the night. Next morning he heads off to work about 3 miles away with no problems. He leaves for lunch and gets about 1.5 miles form work and it dies again. It will not crank. We have it hauled to a friend that works at a repair shop. He looks at it first thing Monday morning and it cranks right up. The fuel pressure is at 42 psig and steady. It had an oil leak from the oil pressure sensor and also a pin was found bent on the sensor. Change the sensor and fix the leak. Checked the codes and there were multiple codes of which I'm not sure of what is current or not. When the car was first cranked up after sitting at the repo lot it smoked black for 30-45 seconds and cleared up so we're thinking this itself could have created some of the multiple codes. One code showed a misfire on cyl. 1, we check the wire (good), change the plug (OK) and checked the compression (good). Still slight miss, change the injector with a spare we had and it helps but does not correct entirely. We cleared the codes and decided to drive it some and see what happens and if any further codes are displayed. We considered and issue with the Opti-Spark but I had a '94 Z that had a Opti issue and the codes specifically pointed it to the Opti.
Today it shut down again about the time it was shifting into 2nd. Since the fuel pump appears to be OK due to the steady pressure we decided to replace the fuel pump relay just in case the relay was going south.
Any suggestions for what to check next?
Sorry so long, just wanted to include the details to better diagnose.
Thanks in advance for any help!
02-19-2008, 10:50 AM #2
- Join Date
- Jul 2005
- Jacksonville, FL
Since the codes were cleared I'd drive it some more and read it again.
02-19-2008, 04:40 PM #3
I would still suspect the opti. Those things are notorious for going out.
02-19-2008, 05:02 PM #4
Well, tonight it sat in the garage for awhile and when he went to crank it up, it won't crank. I'll try changing out the ignition module and get my mechanic buddy to come by while it has the problem. Hard to problem when it's working like it should.
02-19-2008, 05:05 PM #5
if it's not cranking now would be a good time to pull a plug wire and verify that it's not getting spark.
02-19-2008, 05:59 PM #6
First of all, how many miles are on the car?
I would certainly check the plug wires and check the coil harness. LT1 engine compartments get real hot and aalot of the plastics and rubber break down and loosen up.
Clear the codes completely and see what pops up.
02-20-2008, 06:24 AM #7
I have a set of GM service manuals on the way hopefully that will help.
02-20-2008, 06:58 AM #8
- Join Date
- Nov 1999
- over here...
D  V D
- 1999 trans am
sounds like the optispark got some coolant in it...
02-20-2008, 08:03 AM #9
- Join Date
- Sep 2005
- hopewell jct, ny
black 01 red 73
- 01 z28 and 73 z28
make sure you have the right keys (if the key has a chip in it, or should) i had a 98 blazer that i got from a dealer with the wrong set of keys(no chip at all) and didnt even know it had a factory security system on it and the effing thing would just not start . it left me stranded at least 5 times . it would run for a second and just die. not sure about a 97 ss as far as a factory security system
02-20-2008, 03:26 PM #10
02-20-2008, 03:29 PM #11
02-20-2008, 04:30 PM #12
whats a motor
02-20-2008, 04:32 PM #13
02-20-2008, 04:57 PM #14
Ignition module has been suggested as the culprit more than anything else. There is a TSB on the EGR valve for cars in the VIN range as this one. It says it can corrode internally and cause stalling and cranks but fail to start.
Codes are 100 MAF, 300 Miss fire, 400 EGR
Last edited by 2kflhr; 02-20-2008 at 05:05 PM.
02-20-2008, 07:11 PM #15
u should give it a good induction service to maybe help the misfires. clean the throttle, put some injector cleaner in the tank, and seafoam the top end of the engine. sometimes that gets rid of random misfires.
02-21-2008, 04:09 AM #16
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