Thread: Engine miss when hot

If it will miss for you at idle try taking the connector from the top of each injector 1 by 1. If you take one off and the miss gets worse reconnect it and keep dosconnecting the others. Eventually you will take one of the connectors off and the miss will not change. If you can find which

This will help you to identify exactly (hopefully) which cylinder has the missfire and you can continue your diagnosis from there.

PS. I am not sure how hard the injector connectors are to get to on a V8 Rover as I have not seen one in a very long time.

Hope this helps

Dave

Sounds possibly like a dying ignition amp, very common. Repair/replacement/upgrade of ignition amp required. My upgrade here:

Lucas ignition amplifier replacement by Bosch 024

still no luck, have replaced ign mod, plugs, plug leads, coil, and still runs real bad on petrol, will not run on LPG, cap and rotor only year old and look good, any thoughts
Cheers Chris

I was going to suggest the ignition mod, but as that's not the problem i would give andrew a call at Les richmond in melb. Tell them what you have tried and they may be able to help over the phone. Otherwise, take it to them and your landy will soon be happy as can be

Originally Posted by cmart2007

cap and rotor only year old and look good, any thoughts

I'm zeroing in on ... which rotor did you buy? .... (and the cap while we are at it) ....

Well its time to do a wet and dry compression check isnt it !! just to make sure it isnt valve/headgasket/lifter/cam /pushrod/rocker arm related . If it indeed is just the one cylinder , then pulling the plugs might tell you want you need to know , You changed the plugs, did you notice anything with the old plugs ?

I have checked compressions fuel flow, i started it about midday, really hot here! started and ran like a clock, held revs at 2500rpm and watched temp gauge climb to normal ,3 min max as soon as it hit normal engine almost stopped missed badly, now this could only mean spark line, has anyone had problems with hall affecks in the dizzy?

Originally Posted by cmart2007

I have checked compressions fuel flow, i started it about midday, really hot here! started and ran like a clock, held revs at 2500rpm and watched temp gauge climb to normal ,3 min max as soon as it hit normal engine almost stopped missed badly, now this could only mean spark line, has anyone had problems with hall affecks in the dizzy?

Dissy pick-up on a '98 D1 is magnetic and is not usually prone to heat damage. It either works or it doesn't. The ignition amp may behave this way. The coil may sometimes be worse when hot. But my money is on loose or dirty connectors around the coil and amp. Pull off EVERY connector that carries current, squash gently with pliers, push back on. It should take some force to connect.

Next possibility is damage to the anti-theft system. (spider?) You could hot-wire the positive side of the ignition coil, or use a relay and take power from the battery, operate the coil +12V with a new wire from the ignition switch.

Best of luck. Remember electric current passes through clean metal-to metal connections. Oil, paint, dirt and rust are very poor conductors.