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YOUR RESEARCHP1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace oil
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
What I did before was changing all 4 lambda sensors, smoke tested the plenum (no leaks) and changed the oil.
P1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace oil' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check seating etc' (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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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
I replaced the pedal sensor with a working one for test purposes, but that didn’t sort out the problem.
P1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace poti against each other
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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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.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
And as described, I changed the poti against each other which did nothing.
P1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Smoke-test plenum (no leaks)
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
What I did before was changing all 4 lambda sensors, smoke tested the plenum (no leaks) and changed the oil.
P1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check seating etc
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
0
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1
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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.
Discussions that contain suggestions
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.
P1219 and P1578, Potentiometer Accelerator - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Out of the blue, I’ve got these two faults. I replaced the pedal sensor with a working one for test purposes, but that didn’t sort out the problem. The car is very difficult to start (feels like no cold start function), then runs at just over 1.000 rpm without responding to the accelerator.
What can I do, any tests you recommend? Might it be an electronic problem? How to diagnose that?
What I did before was changing all 4 lambda sensors, smoke tested the plenum (no leaks) and changed the oil. This should have no impact at all to the faults. No more faults are stored.
Car is a 2001 "S" 986
Check the connector at the throttle body as well as the ECU. When you turn the key on it should cycle the TB. I had an issue with mine and I don't know what fixed it exactly as I checked everything I could, but after unplugging and re-plugging the ECU it started working again.
Thanks for the suggestions, I did that 5min ago, I unplugged all plugs at the ECU and the one on the throttle. After reconnecting, checking the seating etc. I connectet the battery and found the same odd failure with durametric again. The flap of the throttle was cycled 1x after ignition on and that's it. Don't know if that is normal. The 2.7 starts calibrating after ~30s and keeps this whistling sound. The behaviour of the 3.2 is different. I do not know if that is normal!
I then started the car which ran at 1.200 1/min with the second try. No possibilities to impact anything with the pedal.
I don't know where to start now, really dissapointed. I think it's time for a PIWIS
I think all of the TB's are the same, it should cycle at ignition, and then if you leave it alone (don't touch anything) it should cycle completely again. And if it's not whistling, it's not working. I have used 986, 996 and 997 TB's and they all behave this way in normal operation. You might have a bad TB? I never got to the point of really troubleshooting as it just 'started working' for me.
These values ar from a working Boxster 2000 2.7L
And these values from that "S" that's not running...
Is it possible that the poti + TB fail at the same time when the car was not moved? And as described, I changed the poti against each other which did nothing. It is even not possible to clear these faults!
Recommendations what I should do next?
There are a bunch of values there which make no sense at all, so I am leaning toward an ECU issue.
Both the pedal and the TB have potentiometers. Disconnect them and measure the actual resistances. I’m guessing that the values for the S wiill fall inline with those for the Base.
What do do at that point is unclear to me, TBH.
I still need to report back on the result here. It turns out the DME was faulty; there were faults in the lambda sensor circuit, which, fortunately, could be repaired. With completely new sensors, the car is now running as it should.
That was limited, it was not too costly to repair the DME an all the rest was DIY. So I learned a lot with this issue. What I do not understand is how the DME could have been damaged. This is the biggest questionmark.
This is a source reference. Confirm exact model applicability in the original material.
