Misfire
#31
You might try the Durametric software & cable... www.durametric.com
Bad caps & rotors are common. It would run better with new ones, but billowing smoke is likely something else. Borrowing a MAF for a test is a great idea.
It could possibly be a bad oxy sensor... your car has just one, correct?
But rather than changing parts, we'd rather have the fault codes so we can get a better idea of what is going on in that poor ECU.
Bad caps & rotors are common. It would run better with new ones, but billowing smoke is likely something else. Borrowing a MAF for a test is a great idea.
It could possibly be a bad oxy sensor... your car has just one, correct?
But rather than changing parts, we'd rather have the fault codes so we can get a better idea of what is going on in that poor ECU.
#32
I am by now convinced the smoke (white a snow) is indeed raw fuel-air mixture that is exited from the ports unburnt. It consquently starts to evaporate in the hot exhaust, causing the occasional 'bang' from the pipe, and generally making big clouds and stinking of gasoline.
I hope the P-dealer has the parts on stock, and I will fit them tonight. I'll keep you posted.
If that doesn't do the trick, I'll buy a diagnostic too. If it does, I'll buy the tool anyway.
Peter R.
I hope the P-dealer has the parts on stock, and I will fit them tonight. I'll keep you posted.
If that doesn't do the trick, I'll buy a diagnostic too. If it does, I'll buy the tool anyway.
Peter R.
#34
Yeah, probably. The thing is I can't find anyone to part with the MAF.
I could just get the two, and bugger it. But let's see how the dizzy's pan out. The P-dealer was a rotor short this morning, but he'll have it delivered this afternoon so I can try the stuff tonight. Incidentally, I tried to pull off a rotot and it seemed like someone had glued it on. Hope I don't rip the dizzy shaft right out.
Peter R.
I could just get the two, and bugger it. But let's see how the dizzy's pan out. The P-dealer was a rotor short this morning, but he'll have it delivered this afternoon so I can try the stuff tonight. Incidentally, I tried to pull off a rotot and it seemed like someone had glued it on. Hope I don't rip the dizzy shaft right out.
Peter R.
#36
There's holes burnt in where the copper used to be. Copper's gone completely, just holes (up to 1 mm in diameter) left. Looks like a small version of the moon in there. And black soot everywhere. It's not pretty.
Peter R.
Peter R.
#39
Originally Posted by Peter R.
There's holes burnt in where the copper used to be. Copper's gone completely, just holes (up to 1 mm in diameter) left. Looks like a small version of the moon in there. And black soot everywhere. It's not pretty.
Peter R.
Peter R.
#42
The dist. caps are far worse than the thought that prompted my first post - such severe erosion of the contacts as reported almost suggests that the engine is trying to fire 'out of time' ... ie., triggered to fire when the rotor is too far away from the cap contact .... which causes a too large gap ... which arcs the contacts to death.
The crankshaft position sensor is the reference for the DME trigger ... no?
The crankshaft position sensor is the reference for the DME trigger ... no?
#44
It started after 6-7 weeks being parked outside in crappy weather because I was parked in a daft wheelchair, by which time the battery had died !
I've never heard of a crankshaft position sensor being off. Being broken, yes. The ECU has no idea where the crankshaft is so it simply won't start.
Peter R.
I've never heard of a crankshaft position sensor being off. Being broken, yes. The ECU has no idea where the crankshaft is so it simply won't start.
Peter R.
#45
What happened next? Did you quick-start the car from another battery or a big charger? I wonder if something got damaged in the electronics...?
I had a crank position sensor go bad on me, on another vehicle, not a Porsche. The symptom was, first the car would stall out once or twice at low speed, then one morning a few weeks later, I drove it somewhere for breakfast, and when I was done, it wouldn't start. It sort of started one last time as we put it on a flatbed tow truck. So I agree with your answer 100% on that.
I had a crank position sensor go bad on me, on another vehicle, not a Porsche. The symptom was, first the car would stall out once or twice at low speed, then one morning a few weeks later, I drove it somewhere for breakfast, and when I was done, it wouldn't start. It sort of started one last time as we put it on a flatbed tow truck. So I agree with your answer 100% on that.