I drove three GT's, one auto two manuals.
They all did it at the exact same rpm and had the exact same noise (loudness, quality, and length of time to go away).
All had varying degrees of mileage; from 57 miles to 707 miles.
I rode with the "shop foreman" in all three and he thinks it is an inconsequential engine noise.
I gave him all of the background on my car, and what i think the problem is (detonation).
His exact words were: The piston design is such that when cold, it is not exactly perfectly round... and they designed them that way to prevent piston slap DOWN THE ROAD. If the engine was built with pistons that were really tight (no noise on start up or any other time)then on the initial dry or cold start-up scoring and wearing of the cylinder walls is increased due to the motion of the crankshaft combined with the skirt design. This seems to be a compromise; no noise at start-up but a little noise at tip in. Also, tightly fitted pistons can contribute to strange and mysterious overheating poroblems due to increased friction.
I mention my theory about there being an error in the calibration for open loop causing detonation and he kinda winced and made faces and said it is entirely possible and it does sound pretty close to detonation. But he then added tha Ford goes over the ECM programs continuosly (like everyday) looking for problems. Thats why you can get two cars from the same model year that have different computer programs.
He also added that the noise seems to go away before open loop turns to closed loop which points away from an ECU problem. The piston or pistons he said are heating up faster than the time it takes to go into closed loop.
However, or whatever the case may be, a field engineer will be visiting this particular dealership on friday and the service manager and the foreman (as well as I) are gonna spring this on him and see what he thinks. Could be interesting....
Bottomline: DO NOT TAKE YOUR CAR TO THE DEALER AND RISK GETTING THE HELL SCRATCHED OUT OF IT--FOR NOTHING.
I'm keeping the car and getting the extended warranty (free of charge).
In case anyone is not familiar with my story, I had this engine noise and the first dealer i went to decided to put a motor in it. They fugged up the exterior of the car, and the new engine makes the same noise as the first.
I'll see what the field engineer says and post that, but i'm keeping the car regardless...
Good luck with yours...
They all did it at the exact same rpm and had the exact same noise (loudness, quality, and length of time to go away).
All had varying degrees of mileage; from 57 miles to 707 miles.
I rode with the "shop foreman" in all three and he thinks it is an inconsequential engine noise.
I gave him all of the background on my car, and what i think the problem is (detonation).
His exact words were: The piston design is such that when cold, it is not exactly perfectly round... and they designed them that way to prevent piston slap DOWN THE ROAD. If the engine was built with pistons that were really tight (no noise on start up or any other time)then on the initial dry or cold start-up scoring and wearing of the cylinder walls is increased due to the motion of the crankshaft combined with the skirt design. This seems to be a compromise; no noise at start-up but a little noise at tip in. Also, tightly fitted pistons can contribute to strange and mysterious overheating poroblems due to increased friction.
I mention my theory about there being an error in the calibration for open loop causing detonation and he kinda winced and made faces and said it is entirely possible and it does sound pretty close to detonation. But he then added tha Ford goes over the ECM programs continuosly (like everyday) looking for problems. Thats why you can get two cars from the same model year that have different computer programs.
He also added that the noise seems to go away before open loop turns to closed loop which points away from an ECU problem. The piston or pistons he said are heating up faster than the time it takes to go into closed loop.
However, or whatever the case may be, a field engineer will be visiting this particular dealership on friday and the service manager and the foreman (as well as I) are gonna spring this on him and see what he thinks. Could be interesting....
Bottomline: DO NOT TAKE YOUR CAR TO THE DEALER AND RISK GETTING THE HELL SCRATCHED OUT OF IT--FOR NOTHING.
I'm keeping the car and getting the extended warranty (free of charge).
In case anyone is not familiar with my story, I had this engine noise and the first dealer i went to decided to put a motor in it. They fugged up the exterior of the car, and the new engine makes the same noise as the first.
I'll see what the field engineer says and post that, but i'm keeping the car regardless...
Good luck with yours...