Low rpm idle

[bigrig77]

Hi all, does anyone have a thought to what might cause a low idle rpm, its a 03 zd30 auto and it idles at only 400 rpm , also when you select a gear on flat ground it won't idle forward or back , drives well no other issues, could this be related to timing? Any thoughts? Cheers.

[Rumcajs]

That shouldn't be related to timing. What happens when you use high/warm up idle switch? Do the engine revs increase or not?

Cheers

[bigrig77]

Yeah will give that a go tomorrow. Cheers.

[cairnsGU]

I would be getting injector pump checked out. I have a similar issue were it will idle low for a second before correcting itself or a quick stab of throttle on the odd occasion