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YOUR RESEARCHrough idle and cel codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Check cyl.# 2, 4,& 6
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Suggestion
I believe the code numbers indicate which cylinder is misfiring so check cyl.# 2, 4,& 6 for oily spark plugs
rough idle and cel codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check cyl.# 2, 4,& 6' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check cyl.# 2, 4,& 6' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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rough idle and cel codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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I recently replaced the heater control valve and OAS while i was in there. The car ran fine for about a week. now throwing 300, 302, 304, 306 misfire codes. can anyone give me an idea what to look for. cannot find any vacuum hoses loose.
2003 Boxster S
Cherck
ALL
the AOS connections ensuring they're snug.
ALL
connections... not just the ones you can see. There's a snap-in tube on the AOS that snakes into the hidden world... and, when you're disconnecting it from the AOS... it could become loosened or dislodged on the other end (hidden world).
My money is on the AOS connections, not that I have any money.
Misfire is usually caused by ignition related parts, Ignition coil, spark plug oil fouled from failed AOS ?? I believe the code numbers indicate which cylinder is misfiring so check cyl.# 2, 4,& 6 for oily spark plugs
I agree mostly
But misfire on 2,4,&6 are all on the same bank.
So oil intake from the AOS should affect both banks equally.
But the OP just has the misfires on one bank.
I would look for something that would affect that 2,4,6 bank only.
First thing I would do is a very good visual inspection of all the wiring leading to that bank.
Something could have been disturbed by the previous work.
Some connection could be loose.
wiring could have gotten pinched.
Something could be grounding or shorting out.
Something I never see mentioned on this forum is.....
When one has a problem.
Before you even touch anything.
Get a flashlight and do a very intensive visual inspection
Thanks for the correction.
I just assumed that the layout was alternate count from side to side.
Soooo oil from the AOS could be an issue.
But I think I would still start with a good look at the previous work done.
sorry it took so long to update. you nailed it I had cracked the oil dipstick tube. replace it along with some of the vacuum lines nearby and she runs fine. thanks
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