E30 Zone

as above tryed injector also the electric rail which sends spark to injectors. plug leads also rotary arm what else could there be its getting compreshion

We need to know what type of engine you have there mate.

But as a guess, if it has fuel, spark and compression then im thinking that you have either a M10 or M20 and the N°4 exhaust rocker could have snapped. you need the rocker cover off to check for this.


To check for fuel, remove the plug after turning the engine over, it should be a bit wet with fuel at the tip.
To check for a spark, with the plug out put it back into it's lead and hold it on a good earth with insulated pliers and turn the engine over.

Never just pull a plug lead on a running engine, I used to do this as it was what i was tought but it can fry the ecu if the spark back-tracks through the wiring

its a m20 it has fuel and spark i have checked all this how do you check the exhaust rocker

By takeing the rocker cover off and having a look?

If it is snapped then do not run the engine again untill its repaired because if the bit thats come loose gets under the cam then the cam will punch it through the head, not pretty or cheap once that happens

is it the shape of a tear drop is on the cam and you can adjust them using feeler gauges

just to add visual aid, here's a good pic of both inlet & exhaust rockers

thanks barry my car they seam ok none are broke

Try swapping the plug to another cylinder, if the problem moves with the plug then that's the problem, It's very rare for leads to break but dizzy caps do crack.


It's a puzzler, it has fuel, compression and spark but won't fire and the valves are working as they should.

Have you tested the compression with a gauge? how did N°4 compare to the others?

can you turn it over by hand & see that all appears well - springs operational etc..? use a 22mm (i think) socket on the crank..

It's a puzzler, it has fuel, compression and spark but won't fire and the valves are working as they should.

made me think actually, a good-sparking, plug&lead when out of the head may not reveal a problem ark when in the head.

So yes a swap around should test..

we swoped them around it made her off a few more cyliners. Do you know the fireing order for one of these cars, the dissy cap is lik new. We have not had a compreshion tester on the car yet, but we took the spark out a one and out a four put out fingers over hole and she had equil presure obivously, we took lead from coil pack off. Could the spark sensior have anythin to do with it

the head i have on the car it had broke a con rod and we did have to do alotof work in adjustin at the inlet rocker is was rear right round could my valve be bent

It could be if the piston has given it a whack, you need to test the compression with a gauge rather than your finger, the only other way to see is to take the head off which I would not do unless I had to.

Compression testers are not that expensive and when you test it you are looking for a differance of no more than 15psi between the highest and lowest readings.

kk goin for one now

firing order is ........ 1,5,3,6,2,4