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Author Topic: Misfire  (Read 1384 times)

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greenman

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Misfire
« on: 25 July 2012, 14:26:28 »
Misefire only under hard acceleration then clears
Emission light on
Runs fine on easy acceleration
Any ideas?
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Kevin Wood

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Re: Misfire
« Reply #1 on: 25 July 2012, 15:13:05 »
First things first: Are the plugs OK.

If the emission light is on there will be some codes stored too. Use the paperclip / pedal trick to read them.

Your engine type and size would help diagnosis. ;)
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greenman

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Re: Misfire
« Reply #2 on: 25 July 2012, 15:47:15 »
z22xe 2.2 ,52 plate
Don,t think pedal trick works on this.
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Steve B

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Re: Misfire
« Reply #3 on: 25 July 2012, 16:08:26 »
need a code reader on 2.2
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greenman

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Re: Misfire
« Reply #4 on: 25 July 2012, 16:12:12 »
Checked the plugs
No1 has white deposits on it. The rest look fine?
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Kevin Wood

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Re: Misfire
« Reply #5 on: 25 July 2012, 16:58:59 »
Ahh, true. 2.2 is a tricky one.

Was there any oil or water in the plug wells?

Did the coil pack look OK?

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greenman

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Re: Misfire
« Reply #6 on: 25 July 2012, 17:17:37 »
Plug wells were dry.
Base of the ceramic part of plugs look a bit burnt.
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Kevin Wood

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Re: Misfire
« Reply #7 on: 25 July 2012, 23:17:05 »
Quote from: greenman on 25 July 2012, 17:17:37
Plug wells were dry.
Base of the ceramic part of plugs look a bit burnt.

It could be leaky, I suppose. I'd say if the history of the plugs is unknown, or they have been in there a while (20k+) it would be worth trying a new set.

Would be good to read the codes and see if it's a misfire code and, indeed, cylinder 1.
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greenman

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Re: Misfire
« Reply #8 on: 26 July 2012, 10:26:04 »
Fitted new plugs.Seems fine.
Used twin spark same as previous ones.
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