help!! 3.2 driving me MAD!

[electricracer]

i have had this problem for a while and its driving me mad,
since we bought the car its had a judder at 2500 revs it seems that the engine is trying to jump out the car feels like it has a bad misfire, it only happens at 2500 on steady or light load throttle, really annoying but it can be easily driven round. but thats not the main fault but it may be linked, the main problem is that it dosent always start, when cold fires straight up no problem, when hot starts up no problem but when its been hot and left to cool (heatsoak?) it will not start at all just spins over, eventually when cools it starts fine, once running runs ok (apart from judder).
have replaced coil, dizzy cap, rotor, plugs were done with a top end rebuild (no difference) just had the dme computer tested and an ignition circuit fault repaired and maf tested, new dme relay and replaced speed sensor (not done refrence sensor or head temp yet ) just found today when wont start theres no spark.
is there any more checks i can do to pin down the faults, (im certain they are linked) all the sensor resistances check out when cold

 

[chas3.2]

Sounds like the TDC refrence sensor when they fail you have no spark.

 

[electricracer]

do you mean the flywheel reference sensor? the tdc sensor dosent actually do anything does it?
and would that cause a judder?

 

[chas3.2]

ORIGINAL: electricracer

do you mean the flywheel reference sensor? the tdc sensor dosent actually do anything does it?
and would that cause a judder?

The TDC sensor at the top of engine is for test purpose only and dose nothing to the running of the engine.

You have two sensors mounted on the L/H/R crankcase the top one is the Reference TDC sensor. Makes the spark.
The bottom one is the Speed sensor keep the engine running once started.

The 2500 rpm fault is some thing elss could be air flow meter.

Or the mixture is to week??? test when running at 2500 rpm

 

[chas3.2]

Phil

Always good to get your opinion but the 3.0 SC is very different from a 3.2 and thanks for biging me up.

Best Regards
Charles

 

[Bertroex]

DME box under the passengers chair got soaking wet?

Bert

 

[chas3.2]

is that what was wrong with it ????

 

[electricracer]

ok i had the top end rebuilt by hartech the fault was there before and after the rebuild, so i assume that in stripping the engine they checked all the inlet set up, the air flow meter and dme ecu were sent away for testing the air flow was ok and the dme ecu was tested and found to have a fault when hot with the ignition circuit,this was repaired and i thought this would fix it but no and this is where i am now.
i have changed the speed sensor for a new bosch replacement (no difference) but have yet to change the reference sensor, think this will be my next job. would the cht sensor have any effect on the running?