Random Hard Start

[rb101]

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

[Ahsai]

So it happened when engine was cold and hot? Has the fuel filter been replaced?

[g00sestepper]

I had a similar problem.... Replaced the camshaft sensor (hall sender) and all is well. When I read up about it, apparently if it fails, it can take around 10 seconds to start.

Just a thought.

Cheers

[rb101]

It's has happened both hot and cold. The fuel filter was replaced 40K ago. I'm going to replace the fuel pump relay. It's a cheap part to replace.

[RFM]

I would not simply disregard the advice of "gOOsestepper" if i were you.

[rb101]

Oh, I'm not. Since it's not throwing any codes, I plan on replacing relays. If random hard starts still, persist, I'll swap the cam hall sensors. Cheapest I can find Bosch (W0133-1809340) are about $130 each and Beck Arnley (83-05128616) for $77 each