15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRandom hard starting?
Reported or suspected cause
fuel pump
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
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0
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Reported cause
Which reminds me of one other starting problem with the Boxster, but the starting problem, failure to start, only appeared after the engine died and I had already half guessed the cause was a bad fuel pump.
Leading evidence: 'fuel pump' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'fuel pump' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check fuel lines' (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
If the OP is going to open up the fuel tank for a fuel pump R&R he can check the fuel lines for any cracks/splits or other problem signs.
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Suggestion · Original poster
I'll change next weekend and check the fuel pressure.
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fuel pump
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.
Reported cause
Which reminds me of one other starting problem with the Boxster, but the starting problem, failure to start, only appeared after the engine died and I had already half guessed the cause was a bad fuel pump.
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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T035758Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
All,
About three weeks ago, I arrived home and then needed to move my car in the driveway(5 minutes). The engine turned over as normal, but didn't instantly start up as usual. After about 4 long start attempts, I held the throttle to the floor and it started after a longer then usual cranking. I move the car, shut down and it started like normal. I decided that the crank sensor must be failing and getting a heat soak. I replaced the sensor (car has 150K miles). No issues for two weeks, then yesterday afternoon after work, it happened again. Normal cranking speed, but it didn't actually start up until I held the throttle to the floor. Then it happened again this morning. I have no error codes on the ECU. I can't find anything in the forums. Has anyone had a problem like this?
Thanks
Rick
99 996C4
While both of my Porsche cars have exhibited starting issues, all have been purely battery related.
Either the engine cranked a little slower than usual or the engine simply didn't crank at all and the other symptoms pointed to a low battery.
Since you report normal cranking speed I'm going to offer the WAG there's a fuel supply problem.
Which reminds me of one other starting problem with the Boxster, but the starting problem, failure to start, only appeared after the engine died and I had already half guessed the cause was a bad fuel pump.
Which leads me to: 150K miles... Could be fuel pump. Longer shot: how's the fuel filter?
Oh, a '99 eh? Even a longer shot: Idle air valve could come in for some suspicion too but I would think if so the idle would be a bit goofy at other times.
Sorry, I can't point you to a smoking gun.
It's a C4, e-throttle, so no Idle Air valve. I replaced the filter 40K ago. I'm thinking it's fuel related too. I have a feeling its the fuel pump slowly dying. I'm going to replace the fuel pump and DME relays. The car is starting to get a lot of mileage (replaced both lower front control arms 2 weeks ago, 2nd water pump 2 months ago).
Saw something on the 996 turbo forum about fuel line in tank deteriorating iirc. Wonder if it's the same setup?
2003 Carrera 4S Speed Yellow / 1955 356 Continental 1500 Rust Red
I believe the C4 has the same fuel system, at least in the fuel tank, as the Turbo.
The symptoms do not to me suggest a problem in this area, but it doesn't hurt to eliminate the possibility given the opportunity.
If the OP is going to open up the fuel tank for a fuel pump R&R he can check the fuel lines for any cracks/splits or other problem signs.
Before I replaced the fuel pump, a new fuel pump relay is not expensive and would eliminate the fuel pump relay. If the behavior still occurred it would tend to elevate the fuel pump higher on the list of possible causes.
Relays made no changes. I did replace the Fuel Pressure Sensor for Fuel Tank 996-606-205-00. It's located under the battery tray. It's still kind of early, but replacing that sensor has made my idle much more stable once warmed up. Hopefully this will fix my hard start issues.
