Hi All,
Engine rebuilt and all looked well nice tick over could rev to 2500 to circulate oil and water, tappets went nice a quiet after 5 mins.
No pressure build up in top hose nice and cool not like before. So i'll give it a little test drive.
Well she now miss fires just over 1500 revs? I think it may be the leads breaking down as they are old and a miss match of types or spark plugs?
What do you think????

Surprised you didnt change them whilst you had easy access.

New Plugs and leads fitted, starts sweet, tic over sweet, on the road all is well unit it gets warm then miss fire at over 1500 rev's?
No Power at all? Any ideas???

If your plugs and leads weren't that great what about the coil packs them self?

Any codes? Did you clean the fuel injectors?

Check all the connectors you've had off, fuel temp, coolant temp, air intake temp, MAF sensor, etc. I had something similar when I first got mine (with a blown head gasket) and one of the wires to the air intake temperature plug had broken off where it goes into the moulded on plug. I was able to cut the plastic moulding away with a Stanley knife and solder the broken wire to the remains of the bit sticking out of the plug. If it's OK until it warms up, it would suggest a dodgy connection on one of the temp sensors.

Success ? She raw's again. Had chance to check all the plugs that i disturbed and i think it was either the crank sensor or oxygen sensor.
Didn't notice that even when cold she would misfire at 3000 revs then when warm 1500 revs???
So she now runs as she should but i still have a issue with the oil pressure switch flicking on when warm, I've replaced the pump strip and cleaned pump assembly and all in spec, so do i have a week pressure switch or cooling rad is u/s running on 10w60 oil????

Did you drop the sump and have a look at whatever shells were accessible while you were doing top end? I seem to remember you posted that, in addition to the overheating you had a rattle from the bottom end on cold startup as well as oil pressure light flickering when warm. <br>
You could try changing the pressure switch, they're only a few quid, but a pain in the arse to get at. I seem to recall I took the fan off to do mine.

Yes I did Drop sump and cleaned strainer and replaced pump, money ran out and didn't want the shock of big ends gone etc,
so will need to revisit when money allows. but i have no rattles at the moment like before?
I also didn't want to spend anymore money until i'm happy that the over pressure and over heating had gone.
Did a nice steady drive today 60+ miles and she held steady on temp and even when i pulled up at lights no oil pressure light?
none motorway miles returning on the trip as 13.8 mpg