Hi Guys,
I know this is one of those things that varies from case to case but I wondered if anything strikes a bell with one of you.
My R50 cooper has been misfiring for a bit now when cold and running initially through gears 1 and 2, hesitating on accelaration - before disappearing. Sometimes it takes a few moments to start, but always manages to. Usually occurs after a significant period of time passes, 8-9 hours after switching the engine off, never after just a couple of hours. Idle is a little rough too but I have got a vibration on the bonnet which could be a contributing factor. I will look at sorting that out. Anyway...
I went through the process of replacing the usual suspects, it didn't misfire at first so I switched the battery (needed doing anyway) and then when the misfires started I also did the plugs, ht leads, coil pack, put some redex through the system etc. My levels are also fine. I had Minisport in Padiham do a compression test which showed up clear and gave me a lot of relief. The plugs have been white, showing it's running lean. Bizarrely, it disappeared after they took the plugs out, coil pack and leads off I had no symptoms again... Symptoms started up again however...
Recent other work (past few months) that has been done is a new crank sensor O-ring, a service (oil, filters), new exhaust.
I've tried running a diagnostic on it but no faults have been stored, maybe nothing is showing outside of "healthy" values. I don't know what I'm looking for as regards to live data though. It's never had an EML..
I did have a realisation the other day however, I had two slow starts and misfires when I was low on fuel (1/4 tank perhaps). In addition, on a fairly full tank this morning when I was rushing I backed out of my girlfriend's drive way and into first quickly causing a significant hesitation on acceleration, there would have been a lot of motion in the fuel system with that. With all this into consideration, might it indicate a fuel pump? That might explain the lean condition of the plugs and why symptoms "disappear" soon after start? Although it is bizarre that these things don't appear in the diagnostics?
What'd you reckon?
Cheers,
Ted
I know this is one of those things that varies from case to case but I wondered if anything strikes a bell with one of you.
My R50 cooper has been misfiring for a bit now when cold and running initially through gears 1 and 2, hesitating on accelaration - before disappearing. Sometimes it takes a few moments to start, but always manages to. Usually occurs after a significant period of time passes, 8-9 hours after switching the engine off, never after just a couple of hours. Idle is a little rough too but I have got a vibration on the bonnet which could be a contributing factor. I will look at sorting that out. Anyway...
I went through the process of replacing the usual suspects, it didn't misfire at first so I switched the battery (needed doing anyway) and then when the misfires started I also did the plugs, ht leads, coil pack, put some redex through the system etc. My levels are also fine. I had Minisport in Padiham do a compression test which showed up clear and gave me a lot of relief. The plugs have been white, showing it's running lean. Bizarrely, it disappeared after they took the plugs out, coil pack and leads off I had no symptoms again... Symptoms started up again however...
Recent other work (past few months) that has been done is a new crank sensor O-ring, a service (oil, filters), new exhaust.
I've tried running a diagnostic on it but no faults have been stored, maybe nothing is showing outside of "healthy" values. I don't know what I'm looking for as regards to live data though. It's never had an EML..
I did have a realisation the other day however, I had two slow starts and misfires when I was low on fuel (1/4 tank perhaps). In addition, on a fairly full tank this morning when I was rushing I backed out of my girlfriend's drive way and into first quickly causing a significant hesitation on acceleration, there would have been a lot of motion in the fuel system with that. With all this into consideration, might it indicate a fuel pump? That might explain the lean condition of the plugs and why symptoms "disappear" soon after start? Although it is bizarre that these things don't appear in the diagnostics?
What'd you reckon?
Cheers,
Ted