20 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCheck Engine Light after Oil Change
Reported or suspected cause
engine misfires
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'engine misfires' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'engine misfires' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check filler tube and all looks good' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Oh, cap felt sort of tight/good but any wiggle is grounds for suspicion and of course any noise of air rushing past/around cap is grounds to at least replace cap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
Ended up changing the ignition coil on one of the cylinders.
Oh, cap felt sort of tight/good but any wiggle is grounds for suspicion and of course any noise of air rushing past/around cap is grounds to at least replace cap.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Hey Guys,
This is the second time where I've had an oil change done and my CEL comes on later that day. The 1st time, the dealer said the cap was loose and asked if I had tinkered with it (???).
It's now Friday night, so I can't go back to the dealer until Monday. I'm assuming it's the same problem. I tried tightening the cap, but it seems tight to me. Is there a trick to securing the cap that I should be aware of?
Thanks!
The oil cap's about the only thing that I could think of. What year is your car? On my 1999, I can clear a code by disconnecting the battery. Or take it to Advance Auto and they can maybe ID and clear for you free.
Just a thought....
Sometimes people pull out the oil filler tube on the 996 to make pouring the oil in easier (it's designed to allow this).
If pulled out too far and it has become detached - or if the filler pipe has developed a leak at the bellows, that could cause your issue, even with the cap on correctly.
Here - unclipped and moved to one side
You can se the bellows where splits can occur, and you should also check where the tube is connected at the base.
I've got a 1999 as well.
Thanks for the pic. I checked the filler tube and all looks good.
I checked the oil cap again and it appears tight. Will the CEL clear itself immediately once things are good? Or does it take time? Or it must be cleared manually?
assuming the problem is resolved, the CEL should clear itself after 6 or 7 drive cycles
Drive over to any of the major national auto parts chains and ask to use their code reader, read, write down, then clear the code
I tried tightening the cap again, but my car still doesn't feel right.
Oil pressure when the car is fully warmed up is hovering around 2-2.5, which is higher than normal.
Also, idle RPM is a little rough and driving in 1st and 2nd gear is a little jerky at times.
Are these symptoms directly related to a loose filler cap?
Getting the OBDII codes read from your car will really help here - is there someone you can borrow an OBDII scanner from?
Or maybe you'd consider buying one for these very occasions - they are a great investment for initial fault diagnosis.
I would buy one if I planned to keep my car. I'm in the process of selling which is why the timing of this CEL really bites.
I guess I'll need to make an appt with the stealership.
Yep - otherwise there is no way of diagnosing the CEL (without getting access to a code reader)
In the US, Autozone stores read the codes for free - any auto stores in BC do that for you?
There could be dozens of things that caused that CEL, and they could be completely unrelated to the recent oil change.
Something as simple as the gas cap not being on correctly!
No Autozone here, but I just tried Lordco. They don't offer the free service, but can sell me an ODBII for $180-300! Ouch.
I'm seeing ODBII's on eBay for a fraction of that.
Ouch!
In the US we have Harbor Freight - but the nearest one to you is over 100 miles South.
http://www.harborfreight.com/cpi/cta...emnumber=94168
$39.99 US
Everyone should invest in a code reader!!! Take all this worry out of a CEL. The first trip you avoid going to the stealer you pay for the code reader.
Finally replaced MAF. DTCs came back.
Finally co-worker noticed (heard -- I'm a bit hard of hearing) air leaking past oil tube filler cap (while engine idling of course). One could then wiggle the cap and hear the air leak sounds change.
Replaced cap. $13. No more DTCs. Oh, cap felt sort of tight/good but any wiggle is grounds for suspicion and of course any noise of air rushing past/around cap is grounds to at least replace cap.
More recently, spotted some moisture on trunk lid over engine fluids area (oh, car is an 02 Boxster). Replaced coolant cap and dried all moisture and no more moisture.
My Boxster has just over 193,000 miles and I've replaced more oil tube filler caps (1) and coolant caps (1) and AOS (2) than engines! Original engine. Original clutch.
Sincerely,
Macster.
My '99 Boxster is on AOS #2 as well, and engine #2 - new coolant and oil caps along the way
Also coolant tank #2 FWIW - 90,000 miles on original clutch (so far!)
Just to bring closure on this one...
Brought the car in the other day. The CEL was due to engine misfires. It was just a coincidence that it happened at the same time as my oil change.
Ended up changing the ignition coil on one of the cylinders.
Thanks to all for the advice.
