Misfire

Tiny
KEVD79
  • MEMBER
  • 2003 VAUXHALL ZAFIRA
  • 12,000 MILES
Have misfire in cylinder 2 changed spark plugs misfire still in 2 but number 4 was oily and full of gunk why would it be like that? Changed spark plugs 3 times had 3 coil packs on and changed injectors car runs about 10 minute then goes into limp mode turn car of few minutes back in and works ok again then 10 minutes or less it starts running lumpy and misfiring had 6 diagnostics done all come up same problem misfire number 2 any help will be gratefully appreciated.
Sunday, May 26th, 2013 AT 6:34 AM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check compression on engine if 20% variance there is aproblem with that cylinder. Also check fuel pressure. We have no info for that car
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Sunday, May 26th, 2013 AT 8:29 AM
Tiny
KEVD79
  • MEMBER
  • 4 POSTS
Checked compression and was ok how do I check fuel pressure?
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Sunday, May 26th, 2013 AT 8:34 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You need a gauge for it and possibly an adapter to connect to your fuel system near fuel rail
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Sunday, May 26th, 2013 AT 9:23 AM
Tiny
KEVD79
  • MEMBER
  • 4 POSTS
Fuel pressure ok it's running rich at the minute just done pedal test codes are 0300 and 0400
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Sunday, May 26th, 2013 AT 10:14 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
We don't have acode 400 so this may be aturbo car and means something s amis with that. With aan 0300 code have mechanic look at it because it can be several things and not easily tracked down. As I said in first response we have no info on this car as it's not in u.S. So the answer I gave was ageneric one to lead you in a good direction. And Fuel pressure h as to bechecked with a gauge not "it's good" because it sprays in the air from fuel rail. If they are low it can cause the p0300 code. But we have no specs on what its' supposed to be as it's not in u.S.
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Sunday, May 26th, 2013 AT 10:54 AM
Tiny
KEVD79
  • MEMBER
  • 4 POSTS
Had diagnostics done comes back misfire all the time have you any suggestions where I would be best asking this question please
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Sunday, May 26th, 2013 AT 10:58 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It has to be put on a pro type scanner so it can try to see which one misfires more than others. Then the scanner needs to check crank sensor and other things, not just a generic scanner. You need somenon competent enough that knows the ins and outs of a prop type scanner to do this. That is the ONLY way you'll find the problem. It can be a multitude of things causing it.
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Sunday, May 26th, 2013 AT 11:05 AM

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