[Diy_efi] Re: Volvo EFI problem

[The AirHawk]

Sounds like a small air leak at the throttle body or air-bypass. The leak is enough to cause the 
engine to "surge" up and down, as the idle control tries to cope furiously with it. Don't know about 
Volvos, but this is a common problem on 1st and 2nd - generation Mitsu Eclipses. On those cars, it's 
usually a $.09 O-ring. I've heard of guys being charged hundreds by the Dealer to diagnose this 
problem, and *still* the Dealer couldn't figure it out.

-Scott


> My Volvo 760 GLE with a Motronics EFI system has developed a problem, coincidentally right after a 
> service  at a repair facility, The vehicle is switchable between petrol and LPG. while idling with 
> no load it will suddenly drop in revs and then pick up again. It will continue to do this on an 
> irregular basis but is okay while being driven.
>
> Any thoughts please. I won't take it back or I will be paying for them to guess a repair.
>
> Thanks
> Don