Hi Guys,

A mate of mine has an 03 MK1 T Manual. (I will have one soon!!!) The issue is that when giving it a bit of a hiding, Meaning hitting the limiter a couple of times it starts to run on 5cyl or less for a couple of minutes and then returns to normal. It doesn't make any odd noises when doing so except a major misfire even at idle after you have brought the car to a stop. As I said, this only goes on for a couple of mins regardless of throttle input. It's a major pain when having a bit of a run against someone at the lights only to have it start misfiring and loosing sh*t loads of power.

Have changed a couple of things including new genuine plugs and a good quality synthetic oil but it still goes it. This only happens when you have come close or hit the limiter a couple of times under full throttle.

Another mate has just bought a MK2 auto and it is doing the exact same thing.

Is there a limp home mode kicking in or something??? I have read somewhere about an anti abuse mode and thought that this might be what is happening. If so how do you disable it???

Any help in this matter would be appreciated.

Hey mate and

If its backfiring it could be running lean or could possibly mean the fuel pump on its way out. If you can, get on on the dyno and check AFR's. Also, what mods have been done to the car?

Hey, thanks. Well it has a generic flash tune from one of those CAPA flash tuners but it had this symptom before it was flashed. We have reset the spark gap to .8mm like the instruction says and the thing feels very strong under all conditions except this missing problem. I would have said it was leaning out or the spark was being blown out under boost but it still misses when you pull over and let it idle but only for a couple of minutes or so and then returns to normal.

It is probably something that dyno might pick up. It is just that there is a second car doing the exact same thing and I thought that it might be something that ford has in its program to stop abuse??

Have the valve springs been replaced at all?

Hey mate welcome, sounds like valve float so the valve springs might be shot!!!!

maybe get your friend to see his prefered mechanic to look over it....

Have you checked all your leads?

Could be an issue with the leads...

smicky our T's dont have leads?

Edited May 29, 200818 yr by PURVIE

you were close... Over Boost Mode.. I had a ba11 which did the same thing.

After a really hard time it drops random cylinder and takes a few mins to

come back to normal. (this is what my tuner told me). It doesnt mean

you car wont handle more boost, just needs a good tune..

you also need to change gears when peak power is made not peek revs.

valve float for sure..high revs, burp,burp,burp,burp,burp..... valve float

Valve Springs definately