Do your RPM's ever spike on the odd start up? The Cure is here! - Page 8 - 6SpeedOnline

speed21 · 2011-03-08 11:05:30

Another Workaround?? Here is my latest ...... As noted I have been having a few annoying and possibly related issues, namely the engine cranks dead every second or third engine start, revs flaring, and rev range 1-6 events being logged at engine start/ignition (and no I don't miss downshifts). What I found is that the clutch pedal switch (or ECU?) was doing something a bit strange. It "appears" to work fine, however the "ground" pin on the starter relay was not being grounded consistently. The starter relay ground (for the coil) goes to the clutch switch (or possibly ECU?), and when the engine fails to start, the ground pin goes open circuit, even with the clutch depressed. So, as a workaround I have earthed the "ground" pin on the starter relay, bypassing the nanny state requirement to depress the clutch to start the car. After a couple of days testing, the car cranks on every start and hasn't gone dead - so far so good. I haven't noticed any engine rev flare at start. Will see if the "rev range" events stop as well. Time will tell. So what has been done to date: 1. Porsche set the crank angle sensor (didn't fix the rev range issue, or anything really). 2. Check cabling to starter etc - all good. no corrosion. 3. grounded starter relay Legal Notice: Do not do this mod if you don't know how to start a car with the gearbox in neutral (or pressing the clutch). I accept no legal or other responsibility if you drive over a cliff of multi-storey carpark when starting in gear. hilarious What are you using to read your random over-revs? If it's a Durametric I wouldn't be overly concerned - for whatever reason the Durametric does report bogus low single digit increments in the rev counter. I'd have more confidence if your readings are from a PIWIIS.