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Danny Buonsanto

1999 Boxster 2.5L - Trouble codes for mis-fire - Emission Relevant???

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Today I got these codes when scanning the check engine warning.  Does anyone has had this happen like this and what you think it could be.  Obviosly the chances of all 6 cylinders misfiring at once is pretty slim to none.  Perhaps its bad coils and plugs that is throwing the ignition sequence off? Any thoughts or insights?

 

My car is a 1999 Boxster base manual transmission 2.5L Thanks!


P1313 Misfire, Cylinder 1, Emission Relevant

P1314 Misfire, Cylinder 2, Emission Relevant

P1315 Misfire, Cylinder 3, Emission Relevant

P1316 Misfire, Cylinder 4, Emission Relevant

P1318 Misfire, Cylinder 6, Emission Relevant

P1319 Misfire, Emission Relevant
 

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4 minutes ago, Danny Buonsanto said:

Today I got these codes when scanning the check engine warning.  Does anyone has had this happen like this and what you think it could be.  Obviosly the chances of all 6 cylinders misfiring at once is pretty slim to none.  Perhaps its bad coils and plugs that is throwing the ignition sequence off? Any thoughts or insights?

 

My car is a 1999 Boxster base manual transmission 2.5L Thanks!


P1313 Misfire, Cylinder 1, Emission Relevant

P1314 Misfire, Cylinder 2, Emission Relevant

P1315 Misfire, Cylinder 3, Emission Relevant

P1316 Misfire, Cylinder 4, Emission Relevant

P1318 Misfire, Cylinder 6, Emission Relevant

P1319 Misfire, Emission Relevant
 

Welcome to RennTech :welcomeani:

 

Could be a lean misfire, I'd pull a plug or two, looking to see of they are overly white, sign of lean condition.

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Oh thanks I plan on changing the plugs and coils anyway...how could I fix a lean mixture condition?  My HC level was a bit high on the Dyno @ 15 MPH test.  At 25 MPH, it was within limits...trying to pass CA smog check.  

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1 minute ago, Danny Buonsanto said:

Oh thanks I plan on changing the plugs and coils anyway...how could I fix a lean mixture condition?  My HC level was a bit high on the Dyno @ 15 MPH test.  At 25 MPH, it was within limits...trying to pass CA smog check.  

 

Lean misfires are air leak related (excess air getting into the intake system).

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6 minutes ago, Danny Buonsanto said:

Ah so a hose must be cracked then somewhere?

 

 

Could be, but you need to confirm the lean misfire theory first by looking at the plugs.

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