Hi team,
First post here...be gentle....
So have had my 924S (160bhp) 1988 for a month now.
Sorted out quite a few minor quirks but this one eludes me.
Symptoms: Car starts and idles well. It will cruise at 70mph at 3100rpm...however, it is very slow in getting there and has limited performance. The revs in all gears seem to max out at around 4000rpm and it will not rev freely to the redline at all, standing or moving. It feels like it has hit a rev limiter.
I have checked, as per Clarks and Haynes: TPS, Dizzy cap, rotor and leads, Vac leaks, Changed fuel filter and the lines immediatly before and after, changed sparks plugs and filter, new oil and filter, Fuel pressure test, Fuel flow test, Tested fuel flow pump, DME relays, DME computer, checked Belts (aligned BS pulley properly), AFM, Ignition coil, Engine compression test, cleaned as many earth points as I can on the car...so you can see quite exhaustive.
I have read that the reference sensors could be something to do with it. I have tested as per Clarks, but not with an Oscilloscope and they come out on spec. I have different opinions in how to test them in situ...some say turn key to on (no crank) and the tacho should jump and others say crank engine and tacho should jump. Which one?
I have already signed up to Pelican Parts (USA) and Porsche924 (UK) forums and now here!
So I am putting this out to a wider audience in the hope that this is not a unique problem and someone has been there before!
Open to all suggestions!
Thanks,
M