1999 911 C2 - Acceleration hesitation

[GTrex911]

Hey Everyone,

Looking for a couple opinions here.

I recently Preped my 1999 911 C2 for sale with a 60k service. I changed the belt, plugs, coils, fluids and battery. About 200 miles after I changed the coils and plugs, I noticed a hesitation in my acceleration. This occurs especially when the car is cool (temp outside has been upper 40's to low 60's). I push the accelerator and get a small hesitation followed by a burst of power... kind of feels like a flat spot, I guess. There is no problem idling, and this is not constant, just during acceleration which leaves me to believe that it is not a problem with a mis fire or anything with the plugs. I used the right plugs and coils, per Porsche's TSB.

No check engine lights are on.

I recently cleaned the throttle body flap with STP and used the fuel injection cleaner... about 150 miles before the service... no luck.

Any ideas?

Thanks!

Edited March 7, 2008 by GTrex911

[1999Porsche911]

Hey Everyone,

Looking for a couple opinions here.

I recently Preped my 1999 911 C2 for sale with a 60k service. I changed the belt, plugs, coils, fluids and battery. About 200 miles after I changed the coils and plugs, I noticed a hesitation in my acceleration. This occurs especially when the car is cool (temp outside has been upper 40's to low 60's). I push the accelerator and get a small hesitation followed by a burst of power... kind of feels like a flat spot, I guess. There is no problem idling, and this is not constant, just during acceleration which leaves me to believe that it is not a problem with a mis fire or anything with the plugs. I used the right plugs and coils, per Porsche's TSB.

No check engine lights are on.

I recently cleaned the throttle body flap with STP and used the fuel injection cleaner... about 150 miles before the service... no luck.

Any ideas?

Thanks!

Clean the MAF and Idle Control Valve. Check for small vacuum leaks. If you have a scanner, check the reading of the throttle position sensor at WOT. If not 100%, remove throttle cable from throttlebody and twist it 1 - 2 turns and reconnect,. Check again.

Edited March 7, 2008 by 1999Porsche911