Vt problems

BALCOCUSTOMS

MEMBER
1996 HOLDEN COMMODORE
6 CYL
2WD
AUTOMATIC
212,000 MILES

Hey there. Have a vt commodore that is running real ruff at idle but seems fine as soon as I start driving. It has over heated once but have put seal up in and tested head s and all good. Has been running rough for a long time now. Are plugs and leads a good thing to try. Also there is no vaccum leaks.

Thursday, June 9th, 2011 AT 8:32 AM

2 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

If what you say about the leads, plugs and vacuum is correct, look at a faulty coil pack, check fuel pressure and run a scan to see if there are any unresolved fault codes, start here.

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Thursday, June 9th, 2011 AT 10:35 PM

GEOFFTAYLOR

MEMBER
1 POST

Had a similar problem with my VN Lexcen 3.6 V6,
Rough Idle, and apparently mediocre performance.
- Replaced plugs
- Replaced Leads
- Replaced crank angle sensor
- Did A/B swap of coils with known good one
- Replaced fuel filter

Solution was to replace the injectors - set cost me $145 off the Internet. Result was quiet idle, better performance all round. It felt like a new car.
The ultimate cause of the problem was that my daughter had run the fuel tank dry and the fuel system had picked up all manner of crud from the dregs in the tank. The fuel filter had failed and the original injectors were almost totally clogged. It was cost effective to replace the injectors rather than have them prefessionally serviced.

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Thursday, November 15th, 2012 AT 1:15 PM