Thread: Misfires badly when engine is cold, slight when hot

Perhaps isolate where the miss is - which pot - by removing the plug leads in turn and listening for another cylinder "out" over the baseline miss.

Check out the lead and plug on the suspect pot. Try another plug/lead to see if the plugs gone dead or the lead's fried.

Has the coolant level dropped? Pull the plugs when cold - first thing - then crank the engine and see if anything is expelled from the cylinder - you're looking for coolant. Do a compression check on all cylinders and the you'll get a feel for whether it's mechanical or electrical.

HTH

Pete

assuming its something cheap...

leads and fouled plugs.

It doesn't appear to be just one cylinder, it feels like 3 or 4 for a second or two, then momentarily it will be ok, and then it'll happen again. I'm leaning towards the ign module or rotor button, as it falters less when the engine is warm.

Chris

Originally Posted by eb220

The truck was serviced by a reputable garage a couple of days before I bought it, two months ago.
112,000 km's on th clock.

Could be a multitude of things .... with Blknight.aus pointing out the obvious .....

The Ignition module is not high on my suspect list .... But if the garage is reputable .... take it back and save a wod of $$ in experimenting on changing parts


BUT .... you could lift the bonnet of your ride at night / darkness .... start up the motor, and look for spark leads arking out .....

Oh .... and let us know what "brand" rotor button, has been installed .......

Mike

eb220, if you're leaning that way, do it. My response was based on the other simple and obvious things having been already tried.

Cheers

Pete

I had an issue like this, complete loss of power it felt like rather than just missing. Turned out it was a non-genuine rotor button as hinted by mike. I since found out that you should always use the genuine Lucas Rotor cap and button or you may face some horrible mis-firing after only a few thousand k's which is exactly what happened to me.

New rotor button and it was sweet. That and good quality leads should be used (this is next for me as a preventative measure)

I had a similar issue recently. Caused by a new Bosch rotor button. Fixed problem with a Lucas rotor button. I certainly learnt my lesson there.

so has anyone worked out lucus's 11 herbs and secrets yet when it comes to ignition components. as far as i was aware lucus electrics are sub standard so why cant world class manufacturers make a non genuine componant that works with these systems..