986 S problem at idle, engine won't rev and shakes, battery disconnected

[Heiko]

Man that could be a whack of different things.... I'm thinking MAF, Vacuum leak or possibly a bad ignition coil. Disconnecting the battery doesn't normally hurt anything at all and if the PD said "shame on you for having disconnected the battery" he was probably just being a smart ass lol. The throttle body calibration should be done after the battery was disconnected but the car should run fine without doing it and even if you don't do it, after driving a while it will calibrate itself (just takes longer).
I would pull the connectors to each coil one at a time to see what happens. If you pull one and it doesn't have any effect then you either have a bad coil or a bad plug.
I've seen these things fail and cause issues and not set any CEL. Bizarre but it is what it is... It probably had nothing to do with your bulb change, it was most likely just a coincidence.
A failed coil will usually cause shaking to what you described....
I hope you find the gremlin - good luck.
Heiko

[Ghostrider 310]

At that mileage I would replace the plugs if I was going all the way in to check each coil pack, they are fairly inexpensive and it eliminates one more point of failure. If you have access to a code reader plug it in and post the codes, that might help zero in on it too. Port is under dash driver's side near the fuse panel. Just out of curiosity why the insurance company gps? Do they track your speed in Italy or something to validate whether they want to insure you?

[Gorthaur]

Originally Posted by Ghostrider 310

At that mileage I would replace the plugs if I was going all the way in to check each coil pack, they are fairly inexpensive and it eliminates one more point of failure. If you have access to a code reader plug it in and post the codes, that might help zero in on it too. Port is under dash driver's side near the fuse panel. Just out of curiosity why the insurance company gps? Do they track your speed in Italy or something to validate whether they want to insure you?

Hi and thanks for your reply!

The sparkplugs were replaced @60.000 km in April 2007.

Last time the guy attached the reader he didn't find any errors.

Thanks to the GPS I can save a lot of money on insurance; since my 986 S isn't a DD (less than 4000km/yr) the GPS allows me to pay just for the kilometers yearly covered. The drawback is they track your trips and your max speed.

[Gorthaur]

Originally Posted by Heiko

Man that could be a whack of different things.... I'm thinking MAF, Vacuum leak or possibly a bad ignition coil.

CUT

I hope you find the gremlin - good luck.
Heiko

Thank you Heiko, the biggest problem is the car is at -1 level and the power output is not enough to take her out, not to mention I wouldn't be able to reach the indy without getting killed in the process by other cars, it's a 20 km trip...

I'm getting really disappointed...