Missfire after hard acceleration followed by rapid deceleration

[Junior1]

2003 TT stock, Tiptronic- After a hard acceleration (.5 or above) followed by rapid deceleration (hard breaking) the car will missfire/cut out to the point of almost dying, after a short period of this it (10-20 seconds) will resume normal operation. No codes are being thrown, I had my service guy address this 5 months ago by replacing the Fuel Pump, it seemed to fix it initially but only for a short period of time becuase now it is happening again, not quite as much as before but still happening. Any suggestions would be welcome, I need to bring it back in to the guy who fixed it the first time as the fuel pump and work is warranted for a year but thought I would see if anyone has any suggestions prior to this.

Thanks

[Loren]

2003 TT stock, Tiptronic- After a hard acceleration (.5 or above) followed by rapid deceleration (hard breaking) the car will missfire/cut out to the point of almost dying, after a short period of this it (10-20 seconds) will resume normal operation. No codes are being thrown, I had my service guy address this 5 months ago by replacing the Fuel Pump, it seemed to fix it initially but only for a short period of time becuase now it is happening again, not quite as much as before but still happening. Any suggestions would be welcome, I need to bring it back in to the guy who fixed it the first time as the fuel pump and work is warranted for a year but thought I would see if anyone has any suggestions prior to this.

Thanks

If you have misfires then you have fault codes even if they are pending. What tool is being used to read the fault code(s).

What is the car's history for spark plugs and coils? How many miles?

[Junior1]

2003 TT stock, Tiptronic- After a hard acceleration (.5 or above) followed by rapid deceleration (hard breaking) the car will missfire/cut out to the point of almost dying, after a short period of this it (10-20 seconds) will resume normal operation. No codes are being thrown, I had my service guy address this 5 months ago by replacing the Fuel Pump, it seemed to fix it initially but only for a short period of time becuase now it is happening again, not quite as much as before but still happening. Any suggestions would be welcome, I need to bring it back in to the guy who fixed it the first time as the fuel pump and work is warranted for a year but thought I would see if anyone has any suggestions prior to this.

Thanks

If you have misfires then you have fault codes even if they are pending. What tool is being used to read the fault code(s).

What is the car's history for spark plugs and coils? How many miles?

38k miles, car had full 30k service done. Not sure what tool was being used, will need to check with my service guy, he is a certified Porsche mechanic.

[Loren]

Most common issues are wrong spark plugs, bad coils, and loose intercooler hoses.

[fdorn]

2003 TT stock, Tiptronic- After a hard acceleration (.5 or above) followed by rapid deceleration (hard breaking) the car will missfire/cut out to the point of almost dying, after a short period of this it (10-20 seconds) will resume normal operation. No codes are being thrown, I had my service guy address this 5 months ago by replacing the Fuel Pump, it seemed to fix it initially but only for a short period of time becuase now it is happening again, not quite as much as before but still happening. Any suggestions would be welcome, I need to bring it back in to the guy who fixed it the first time as the fuel pump and work is warranted for a year but thought I would see if anyone has any suggestions prior to this.

Thanks

I have an 01 TT with 55,000 miles on it. About 2 months ago, under heavy acceleration (.5 or above), the car would misfire. The whole car would shutter like hell and the the power would cut off. The first time it happened my ABS/PSM and engine light went on. After 20 seconds the all went off but the dash was still saying 'go to the nearest service...'. It was a misfire on cylinder 1. When I drove it normally it was fine.

Dealer (Napleton Porsche Chicago) replaced the plugs and the car absolutly drives like a different car. Under heavy acceleration I see .9 boost (which I can't remember ever seeing). It absolutly SCREEMS. It made all the difference in the world.

Edited March 11, 2009 by fdorn