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YOUR RESEARCHLong crank before starting - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Use just about every day
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Performed · outcome unconfirmed
A scope is second only to a topflight diagnostics scan tool in shop usefulness; we have a four channel that gets used just about every day for a myriad of test.
Long crank before starting - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Use just about every day' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check cps wave form' (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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Suggestion
I would still check the CPS wave form..............
Long crank before starting - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check on fuel pressure
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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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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Long crank before starting - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use just about every day
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
A scope is second only to a topflight diagnostics scan tool in shop usefulness; we have a four channel that gets used just about every day for a myriad of test.
Long crank before starting - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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This car always started right after the key is turned. Now it takes a while when cold. It turns over quick just takes a while to start. Giving it some throttle helps.
Did a check on fuel pressure. Still had over 40 # after a week of not using and 50 when running. I considered a CPS but is seems that is more of a warm start issue. No codes.
Any ideas?
@JFP: That's interesting. Up to now, I have assumed that the display of a speed (in Durametric) correlates directly with a functioning sensor system. If the data characteristics also need to be taken into account, I will have to invest in an oscilloscope.
A scope is second only to a topflight diagnostics scan tool in shop usefulness; we have a four channel that gets used just about every day for a myriad of test. Without a scope, you can only see if a CPS does or does not have a signal; the scope tells you if that signal is a quality and consistent signal when compared to a known good version.
That’s a great point, JFP!
What do failures typically look like? The ECU is processing a frequency signal, but I’d assume there is some minimum voltage that the sensor needs to generate in order for the signal to be viable.
Do you typically see low output voltages in failures, or is the waveform missing pulses, or is it “yes, all of the above and then some”?
Thanks,
The CPS generates a uniform pulsing waveform for each of the shutter teeth on the rear of the flywheel, with a single blank spot for a missing tooth for the DME to see TDC.
We had a car come into the shop with a complaint of multiple codes and poor running. After scanning the car for codes, we hooked up the scope to the CPS and found several distorted waveforms as well as multiple missing ones. We pulled out the CPS and put a borescope camera in its place and then rotated the engine by hand to find both bent and missing shutter teeth on the flywheel. Turns out the owner had a clutch replacement done by a buddy, who apparently dropped the flywheel while reinstalling it.
Point is that the scope data told us exactly where to look that no scan tool could ever do.
It's things like this that make one detest German cars.
Is this to affect the rich mixture on startup to compensate for the 986's lack of a cold fast idle? By that I mean you have to manually rev the engine on startup if you need to do this, because there is no fast idle valve nor does the computer compensate for this, cable or drive-by-wire throttle model.
