300d 5 cyl 1988 in hymer s660 help!
 

Hi

I bought this motorhome last year and it ran beautifully all year

Since waking it up after the winter it is not so good

Initially it would misfire when cold and be back to normal once warm

Tracked it down to air in fuel line

Replaced all return lines on injectors, new filters thought that was it

No it still is mifiring and seems to emit whiter smoke when spluttering

It starts on the button and heater plugs and relay are ok

Any help greatly appreciated as to where to go next

73k miles on clock

Thanks

ps Seem to have sorted all fuel line problems but can see air in return line from injector pump to fuel cannister when revving engine. Is this normal?

Thanks for the reply

Already tested glow plugs - all fine

am leaving in to garage for full check on fuel lines as I need to get it sorted fast for holidays

Will let you know how I get on

Seamus

300d update
 

I left in my old Hymer to my local mechanic who is an ex mercedes trained mechanic and I am glad I did.

It turns out I had sorted all air issues but I had not realised there was another fuel filter in canister at engine.This he said was quite dirty so He started there and on next cold start up still had misfire. He then went on to injectors and found no 5 not firing. He pulled all the injectors an on test found no 5 ok but no 3 not up to scratch. He then came to the conlusion that the tappets were getting tight so adjusted them with no 5 being tightest leading to exhaust valve staying open. i am getting her back today and unless valve seating on 5 is damaged I should have a much smoother and more powerful engine back. Some things are better left to the experts! Dont know what cost is yet but whatever I hope it runs well !!

300 update
 

Got her back and running like new

Quieter, more power
and hopefully easier on juice

:D