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Misfire when cold?

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Old May 24, 2011 | 06:25 PM
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freeagent3117's Avatar
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Misfire when cold?

I did a search but couldn't find anything for 09+ turbo. When shes cold, through the exhaust I can hear a small bump sound. Inside the car the RPM's drop about 50 everytime it makes the sound. My once every two seconds when cold motor. It has 45k miles. Plugs already seems odd. 93oct pill and catback. Thanks.
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Old May 24, 2011 | 06:32 PM
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Originally Posted by freeagent3117
I did a search but couldn't find anything for 09+ turbo. When shes cold, through the exhaust I can hear a small bump sound. Inside the car the RPM's drop about 50 everytime it makes the sound. My once every two seconds when cold motor. It has 45k miles. Plugs already seems odd. 93oct pill and catback. Thanks.

Runs rough when stone cold? Mine does exactly the same.

Can't make a useful comment on your "odd" plugs though!

Rich
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Old May 24, 2011 | 07:01 PM
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See next post.

Last edited by Slee256; May 24, 2011 at 07:08 PM.
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Old May 24, 2011 | 07:05 PM
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Originally Posted by richardjh
runs rough when stone cold?
Misfire when cold?-stone_cold_steve_austin11.jpg
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Old May 24, 2011 | 10:08 PM
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Cold timing map, causing the exhaust system to heat "quickly" up so as obtain optimal EGT
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Old May 25, 2011 | 12:30 AM
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Originally Posted by sstevojr
Cold timing map, causing the exhaust system to heat "quickly" up so as obtain optimal EGT
Yea that makes sense. Thanks!

Originally Posted by Slee256
Haha oh no he's in my car!?
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Old May 26, 2011 | 02:00 PM
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mine do the same, misfire when cool
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