Thread: cranks but will not fire

have you tried removing the fuse for the factory alarm?? my hazards flash when i hit some serious bumps but i shut it down and it restarts fine! Does it only do it when the engine is hot?? Your coil could have an intermittent fault so have you used a known good one for a test mule? just because you can see a spark doesnt mean its a strong one! You say its getting fuel but is it too much fuel? when it finally starts is there black smoke from the exhaust or is it clean? I've seen a lot of posts here about sticky or blocked injectors look throught the archives you may see something similar to your problem

As it's causing you obvious grief I would suggest looking at doing the Bee Utey Bosch module upgrade and going from there. The ignition sytems in our buses are a known weak link and at best marginal. Do the upgrade, check all connections, etc and replace the coil with a MEC717 to go with the BIM024 module. If yours still has the module on the dizzy (like mine had) then that's a recipe for grief. Get it away from there at the very least and remote-mount it near the coil. If the module isn't firing cleanly then the EFI won't be either as thats where it gets it's engine speed signal from. Poor spark + poor fueling = unhappy driver... My two bob's.

Originally Posted by DiscoClax

As it's causing you obvious grief I would suggest looking at doing the Bee Utey Bosch module upgrade and going from there. The ignition sytems in our buses are a known weak link and at best marginal. Do the upgrade, check all connections, etc and replace the coil with a MEC717 to go with the BIM024 module. If yours still has the module on the dizzy (like mine had) then that's a recipe for grief. Get it away from there at the very least and remote-mount it near the coil. If the module isn't firing cleanly then the EFI won't be either as thats where it gets it's engine speed signal from. Poor spark + poor fueling = unhappy driver... My two bob's.

My one Bobs worth........Fully agree x 2 Bob

Thanks for confirming the direction I was heading.
It does it hot or cold.
All fuses checked out OK
Have tried other OK coils but no joy.
(Once changed coils and no joy, put old coil back and after a few more cranks it fired! Go figure!!)
My set up is a coil & ignition mounted together on LH inner guard
Looks like I will replace coil & ignition module even if it is only to further eliminate whatever gremlins are living in my vehicle.
I would really like to sort this issue out as I am starting to think of putting a 4.6 in the future.

Cheers
Thommo