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Vz Misfire!

christo

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Hi there, I have a 99 VZ V6, 105k, which is misfiring intermittently. It is smooth after startup for about 30 seconds then misfires and idles rough, if I drive for a bit the problem is still there but goes away from time to time when idling. (but never completely!) No error codes or messages at all. Has anyone got any ideas? Would greatly appreciate it. I'm off to check hoses. Thanks!
 

PaulSV6

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99 VZ??

When where the spark plugs last changed? Could also be a bad batch of fuel you've picked up, run some Wynns injector cleaner through it if thats the case.
 

Sean880

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If you have a faulty plug lead or leads you will also experience a miss problem.
 

calay

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i had that with my calais not too long ago - a couple of weeks after i changed the plugs, and a day after holden serviced it...sus much???

i couldn't work out if it was the fuel or coil packs but after loosning and re-seating all the coilpacks it was fine... it was very weird and annoying tho
 

christo

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sorry i meant 06 VZ! Thanks for the help, will go round the plugs & leads next.
 

PaulSV6

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If you have a faulty plug lead or leads you will also experience a miss problem.

VZ's dont have Leads, they have electronic coil packs. In place of the older leads & distributor cap.
 

bigdaddycool

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It's probably a vaccume leak or your spark plugs, check your intake manifold bolts are tight enough.

I had this once when changing my sparkies...
 

baracuda

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i got the same prob and diagnostics showed something wrong with injector circuit on cylinder 6 ? still dodgy fuel i dunno?
 

christo

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Thanks for the replies, just changed all the spark plugs and no difference. Perfect idling for about 30 seconds when cold, then rough idling & acceleration most of the time. Will keep testing thanks......
 

PaulSV6

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Have u tried process of elimination. Unplug each injector one at a time & see which one makes the difference or no difference
 
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