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'79 928 Euro 5 Speed
 
Rupesy's Avatar
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 348
Garage
'00 boxster base - cam deviation issue

A few weeks ago, I was leaving work and came to the first stop light and the car started to have a rough idle and lower than normal rpms, but accelerated just fine. Decided just to get home (stalled a few times). Ran the durametric on the car and found a P0300, P0304, P0305, P0306 and one other I cant remember but had to do with the variocam. I also checked cam deviation and bank 2 was running somewhere around +22, other side about a -8. After much research, I decided it was time to pull the cam cover and see what was going on. I did all this engine in car. What I found was a variocam chain guide on the top completely gone. The bottom one severely worn. The timing chain and marks all seemed in order so no jumped teeth. I figured the missing guide was the problem so I proceeded to put on new guides, reset the timing and put all back together. I did that and ended up with the same rough idle at start up. I went back in with durametric and now the cam deviation is +19. I used the durametric to cycle the solenoid on bank one and it definitely made the engine rpm change. I tried it on the bank 2 but didn;t seem to alter the engine. I'm about to tear it all back down again as I am thinking it is either the solenoid or actuator (or both) that is also the problem in addition to the failed guide. Is there anything else I should check before I tear it down? Can a cam sensor also cause this issue?
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'79 Porsche 928, '00 Porsche Boxster,
'86 Porsche 944, '04 BMW Z4
'77 Fiat Spider 124,'07 Chevy Suburban LTZ
'83 Jeep CJ7, '06 Harley Sportster
Old 07-15-2019, 06:35 AM
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Join Date: Jan 2004
Location: Northern Virginia
Posts: 3,044
Just curious how many miles are on your engine.

A friend of mine had his chain guides fail recently (about 100,000 miles).
I had a variocam actuator fail on my car (2.7L boxster). It only had about 42K miles so I didn't worry about the chain guides then. I don't think a cam sensor would be the cause of your issue.

I wonder if these guides are becoming a new "maintenance" item now that more and more cars are higher mile examples or ia combo of both miles and age (and old brittle plastic)
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1970 914-6
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1978 911SC, 1976 914 2.0, 1970 914 w/2056
Old 07-23-2019, 04:19 AM
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Join Date: Jul 2019
Location: Silver Spring, MD
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Large cam deviation values are also a symptom of a failing IMS bearing. Have you checked your oil filter or oil sump recently for shiny bits o' metal?
Old 07-28-2019, 06:12 AM
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