New 90 3.5 efi owner,idle question?

Hi all,

Rob here from west Wales, I've just purchased an 89 truckcab that has been retro fitted with what I think is a RR 3.5 efi.....

Runs very well except on starting from cold the she takes quite a while for the idle to drop to a normal level (no revcounter fitted yet) I'm thinking she's up at approx 1500/1700 then drops to approx 800/900 but takes a long time to do this!!

Any pointers on what the problem may be?

Thanks,
Rob.

PS unsure until I look again in daylight if its a hotwire or flapper efi...

Try disconnecting the cold start injector. That's the fuel injector stuck to the side of the plenum.

That will be the cold start injector that only works when the temperture is below something like -20c so never works in the uk.

Hi,
Removed the air filter last night and tried again from cold,hey presto started perfectly and revs dropped within a couple of seconds.....
Filter was totally choked....
Would this have caused the problem?
Thanks
Rob

Rob8271 said:

Filter was totally choked....
Would this have caused the problem?

Click to expand...

Lack of or irregular servicing?

Probably but as I've only just purchased it you maybe right!