6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIntermittent Hard starting
Reported or suspected cause
same story
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that suspect a cause
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Suspected cause
The ignition trigger is another prime suspect when this symptom appears on Bosch units on BMWs, most likely the same story with Porsche...
Leading evidence: 'same story' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'same story' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check with lindsey racing in oklahoma city' (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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Discussions that suspect a cause
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Suspected cause
The ignition trigger is another prime suspect when this symptom appears on Bosch units on BMWs, most likely the same story with Porsche...
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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Suggestion
Otherwise, check with Lindsey Racing in Oklahoma City to see if they have $40 cps cables that are the exact same as used on BMW E30, etc.
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Suggestion
Another hard start issue may result from poor residual pressure in the fuel line, due to faulty internal check valve which fails to maintain internal pressure while you run into the supermarket or go to lunch.
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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Suggestion
Otherwise, check with Lindsey Racing in Oklahoma City to see if they have $40 cps cables that are the exact same as used on BMW E30, etc.
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.
Suggestion
Another hard start issue may result from poor residual pressure in the fuel line, due to faulty internal check valve which fails to maintain internal pressure while you run into the supermarket or go to lunch.
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.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all
I have a 2003 c2 with approx 85k miles
sometimes I am having a hard start issue where the motor cranks over but won�t fire up for several seconds
when this is happening, I notice no bounce of the tach needle
when it starts fine (99% of the time), the tach needle bounces prior to firing up
i also have a 944 and the DME relay is a known issue, to where it�s recommended you keep a spare in your glove box
when the 944 DME is acting up, you have the same symptoms with no tach bounce.
could this be a DME relay issue? Is this also a known thing on 996�s
any help from the brain trust here is appreciated
It's very likely your crank position sensor is on its last leg. It's unlikely the DME relay because the DME needs to supply power to the starter relay.
Ditto the CPS (either crank or camshaft, they're the same part no.) for such symptoms. When these fail (as on other Bosch systems such as on Porsche 951 or BMW E30), it's not the sensor itself, but rather the connector plug which attaches to another cable going to the Motronic. The exterior of the cable plug may look just fine, but the internal plastic bits crack and crumble with age and thermal cycles, so don't hold the three little wires properly, so one day she won't start due to poor continuity/loose bits inside. Wiggle the wires and see if that helps to isolate the problem. If you're careful removing the little metal clip holding the plug together and don't let the bits fall out, you can repair this plug with Crazy Glue. Otherwise, check with Lindsey Racing in Oklahoma City to see if they have $40 cps cables that are the exact same as used on BMW E30, etc. instead of paying the Porsche dealer ~$180 each...
Also spank the Motronic, in case it has a hairline crack which opens and closes with temperature changes. If that works, consider reflowing the solder joints with an $8 soldering pen from Harbor Freight. The ignition trigger is another prime suspect when this symptom appears on Bosch units on BMWs, most likely the same story with Porsche... Such ignition trigger can be replaced at DigiKey or Radio Shack, for about $4 each, get the number stencilled on your unit for comparison.
Another hard start issue may result from poor residual pressure in the fuel line, due to faulty internal check valve which fails to maintain internal pressure while you run into the supermarket or go to lunch. So, since pressure falls off quickly after shutdown, it takes more cranking on restart to build fuel pressure to start the car. A check valve inserted in the return line downstream of the fuel rail fixes this, and saves undue wear on starter and fuel pump.
