9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPoor cranking?
Leading reported evidence
Replace battery last january and have had no issues
Performed · outcome unconfirmed
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Performed · outcome unconfirmed · Original poster
I replaced the battery last January and have had no issues with starting, the car starts first time, 99% of the time.
Leading evidence: 'Replace battery last january and have had no issues' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean contact' (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
Make sure the starter earth lead is tight and making clean contact and that the battery earth is clean and tight.
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Suggestion · Original poster
My C4S suffers from poor cranking when starting, worse if the engine is warm (the oil scavenger in use).
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Suggestion
3.6Ltr crs have the variocam plus which uses a peg to hold the rotor in the late timing position when the engine is stopped.
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9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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My C4S suffers from poor cranking when starting, worse if the engine is warm (the oil scavenger in use). I replaced the battery last January and have had no issues with starting, the car starts first time, 99% of the time.
Any suggestions? Starter motor?
Damian
Migration info. Legacy thread was 105624
Damian,
If the car starts first time, 99% of the time, what do you mean by poor cranking? Is it the investigation into why it doesn't start the 1% of the time? Or have I completely lost the plot... :wink:
Migration info. Legacy thread was 105639
Make sure the starter earth lead is tight and making clean contact and that the battery earth is clean and tight.
Migration info. Legacy thread was 105640
I had what Stevo suggests, needed a new earth strap even though mine looked good. Remember resistance increases with temperature (said in a Yoda voice) Hmmm.
Migration info. Legacy thread was 105662
postamble();
Hi, I have a 2002 MY C4S and very occassionally have the same starting from hot it seems to hesitate and crank slower than usual - but it also always starts so haven't worried to much about it.
More of a worry was the fact on those hot start occassions when it fires up it sometimes sounds like a bag of old nails for a couple of seconds - have posted before about this and everyone assurred me it was normal.
Doing some reading up this evening though I noticed/read a couple of things in the Porsche 911 story by Paul Frere.
1. FYI the 996 doesn't have a oil scavenger pump as the oil tank is located under the crankcase seperated from it by inclined slats allowing crankcase oil to return to the oil tank avoiding the need for the scavenger pump.
2. 3.6Ltr crs have the variocam plus which uses a peg to hold the rotor in the late timing position when the engine is stopped. This avoids a brutal contact of the vanes with the stator walls for the short time required for the oil pressure to build up when the engine is started - I wonder if this is the bag of old nails I am hearing on warm start up - I.E. I wonder if my 'peg' isn't locating correctly ???
Cheers
Migration info. Legacy thread was 105687
Sundeep, it's my car, it's never left sitting unused for a period of time!
Vlad, interesting reply. I don't remember seeing 'bag of old nails' in the options list, but it looks like we've both managed to spec that option. Now how do we get an OPC to investigate this?
Migration info. Legacy thread was 105746
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