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Registered User
Join Date: Jun 2014
Posts: 8
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1999 Boxster Rough Idle / stalls ( see video)
I just bought the car which was sitting in the garage for over a year maybe more 121k miles. The problem:
It starts hard and drops RPM / stalls also doesnt rev more then 3k need to keep the pedal pressed to run. CEL is on see video ( sorry its upside down) The previous owner claims to have changed spark plugs ignition coils air oil separator cleaned fuel injectors new battery I ran a diagnostics using Porsche scanner it says 1) Camshaft position sensor 2 2) Mass air flow sensor 3) Misfire on Cylinder 4,5,6 where do I start? COILS / SPARK PLUGS? thanks |
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06-12-2014, 09:22 AM
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Registered User
Join Date: Jun 2014
Posts: 8
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p1397 Fault code 113 camshaft
p0102 code 115 mass air flow p0300 code 75 miss fire p0306 code 68 cylinder 6 p0304 code 66 cylinder 4 p0305 code 67 cylinder 5 |
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06-12-2014, 01:01 PM
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Registered
Join Date: Nov 2009
Posts: 181
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If it isn't some kind of catastrophic issue I would start out with a smoke test and look for vacuum leaks.
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06-12-2014, 05:39 PM
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Registered User
Join Date: Jun 2014
Posts: 8
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is there a DIY for smoke test
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06-12-2014, 06:42 PM
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Registered
Join Date: Nov 2009
Posts: 181
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I was suggesting a smoke test because I tend to think you have a leak someplace.
Without a smoke machine you can try and visually look for leaks. Based on the way yours is running either you have a really big leak or something else really wrong. One time I took a plastic slurpee cup and cut it so I could duct tape my shop vac hose to it and then I connected it to the intake where the MAF would connect. I then could listen for leaks. You could also have a camshaft sensor problem too. I am by far not a 986 expert though. Most of my car repairing exp is on BMW. |
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06-13-2014, 12:44 PM
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Registered User
Join Date: Jun 2014
Posts: 8
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Anyone on this read - it stalls / misfires alot
p1307 Fault code 113 camshaft p0102 code 115 mass air flow p0300 code 75 miss fire p0306 code 68 cylinder 6 p0304 code 66 cylinder 4 p0305 code 67 cylinder 5 |
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06-20-2014, 09:32 PM
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Registered User
Join Date: May 2012
Posts: 23
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Vacuum leak or possible failing crank position sensor.
After I changed my CPS I had misfire codes like crazy and once I ran it for a bit they cleared once the computer saw where the crank was at. |
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06-21-2014, 08:38 PM
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Registered User
Join Date: Jun 2014
Posts: 8
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OK I changed the Camshaft with a after market camshaft of ebay - it looked different i still tried it out - it started a little better then before but still camshaft error code
when I unplugged the Camshaft sensor altogether it wouldnt even start also the swish / screeching sound is the pulley I ordered the OEM camshaft to make 100% sure. Now, lets say the new sensor is OK and i still get the Camshaft error code same bank what would that mean? and I dont have a Vacuum leak thanks |
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06-21-2014, 08:44 PM
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Join Date: Nov 2009
Posts: 181
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If you don't have a vac leak, you need to do a compression test on each cylinder as your next step.
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06-22-2014, 04:18 AM
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Registered User
Join Date: Jun 2014
Posts: 8
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so regardless of the misfire I still do a compression test? if the compression comes out bad that side is messed up right?
Whats the reading for a cold engine compression. |
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06-22-2014, 10:02 AM
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Join Date: Nov 2009
Posts: 181
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I had an engine that had a bad intake valve seat which resulted in 0 PSI on one cyl.
This also messed up the vacuum too since the thing was pushing air back to the intake. Like you I was chasing all sorts of problems, but once I ran the compression test and found the dead cyl I finally found the problem. Run your test and see what you come up with. You want to see at least 150 psi (don't quote me on that number. I am guessing based on other engines) |
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06-22-2014, 12:09 PM
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