Mick1988
W.A. Cruise Moderator
- Joined
- Apr 6, 2008
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- Perth, Western Australia
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I have a 1997 VT SS with the L67 supercharged V6 engine. This car has been driving me crazy with a starting issue that I just can't find. I'm going to post in order everything that I have done to the car to eliminate the problem and I'd really appreciate input that could help me find this issue.
1. Car always ran rough when first started on a cold morning (as you would expect with a vacuum leak or slightly blocked injectors).
2. Moved it twice in my driveway and it ran really rough (as though it was running on 5 cylinders)
3. Went to start it again and it repeatedly turned over, occasionally firing but not actually starting and running.
4. Checked operation of immobilizer and confirmed with my Tech 2 that immobilizer is being turned off correctly. (plus immobilizer cuts out the cranking).
5. Changed the battery to one with full charge. Car still turned over and fired every five to ten seconds but didn't actually start or run.
6. Hooked up my Tech 2. No current faults but had a CAM angle sensor in history.
7. Changed the CAM sensor with one off a known running car. Tried the sensor off the SS on the other car with no problem.
8. Swapped MAF sensors between the SS and a known running car, no change.
9. Unclipped top fuel hose and turned the ignition on. Fuel pressure seemed fine (fuel shot to the radiator support, same as the other car).
10. Tried starting the car with throttle open 100% to eliminate idle air control valve
11. Fitted a brand new crank angle sensor. No change
12. Tried a DFI module and coil packs off a know running car. No change.
13. Tried holding leads close to headers to check for spark. 4 hard spark, 2 shocked me. Changed those leads and the coil packs and this still happened so assumed it wasn't an issue.
14. Tried crank angle sensor off a known running car to eliminate the new one I bought being faulty.
15. Tried 6 injectors off a known running car. No change. Didn't change fuel rail though as the top bolt was rounded.
16. Inspected vacuum system. Found 2 hoses missing near supercharger coupling (these had been missing since I bought it though which is probably why it ran like **** on cold mornings). Changed everything over from running car which made no difference.
17. Changed all relays (including headlights, power windows, heated windows etc) from a known running car.
So can anybody please help me? I'm at my wits end with this car I'm about to literally wreck it the only thing stopping me is that it's a factory L67 SS and still in rego. Only thing I can still think of is changing the fuel tank to eliminate bad fuel (I fueled up not too long before it died) but I really don't think that would cause it not to run at all. Is the leads shocking me when I hold them against the headers something that indicates a fault?
I will note that I HAVENT changed the plugs and leads (apart from the two leads that I was getting shocked by) however these were changed about 15,000km ago with good quality parts.
Input would be really appreciated.
Thanks
Mick
1. Car always ran rough when first started on a cold morning (as you would expect with a vacuum leak or slightly blocked injectors).
2. Moved it twice in my driveway and it ran really rough (as though it was running on 5 cylinders)
3. Went to start it again and it repeatedly turned over, occasionally firing but not actually starting and running.
4. Checked operation of immobilizer and confirmed with my Tech 2 that immobilizer is being turned off correctly. (plus immobilizer cuts out the cranking).
5. Changed the battery to one with full charge. Car still turned over and fired every five to ten seconds but didn't actually start or run.
6. Hooked up my Tech 2. No current faults but had a CAM angle sensor in history.
7. Changed the CAM sensor with one off a known running car. Tried the sensor off the SS on the other car with no problem.
8. Swapped MAF sensors between the SS and a known running car, no change.
9. Unclipped top fuel hose and turned the ignition on. Fuel pressure seemed fine (fuel shot to the radiator support, same as the other car).
10. Tried starting the car with throttle open 100% to eliminate idle air control valve
11. Fitted a brand new crank angle sensor. No change
12. Tried a DFI module and coil packs off a know running car. No change.
13. Tried holding leads close to headers to check for spark. 4 hard spark, 2 shocked me. Changed those leads and the coil packs and this still happened so assumed it wasn't an issue.
14. Tried crank angle sensor off a known running car to eliminate the new one I bought being faulty.
15. Tried 6 injectors off a known running car. No change. Didn't change fuel rail though as the top bolt was rounded.
16. Inspected vacuum system. Found 2 hoses missing near supercharger coupling (these had been missing since I bought it though which is probably why it ran like **** on cold mornings). Changed everything over from running car which made no difference.
17. Changed all relays (including headlights, power windows, heated windows etc) from a known running car.
So can anybody please help me? I'm at my wits end with this car I'm about to literally wreck it the only thing stopping me is that it's a factory L67 SS and still in rego. Only thing I can still think of is changing the fuel tank to eliminate bad fuel (I fueled up not too long before it died) but I really don't think that would cause it not to run at all. Is the leads shocking me when I hold them against the headers something that indicates a fault?
I will note that I HAVENT changed the plugs and leads (apart from the two leads that I was getting shocked by) however these were changed about 15,000km ago with good quality parts.
Input would be really appreciated.
Thanks
Mick
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