Date: Sat, 15 Jul 2006 23:03:11 +0100 From: "Moray Cuthill" <moray.cuthillnospamme.uk> Subject: Re: Could this be the mass air sensor?
"Tim.." <the.farm.hates.spamnospamternet.com> wrote in message news:o5KdnctmkuJVZiXZRVnyiAnospamom... > > "DervMan" <thedervmannospaml.com> wrote in message > news:44b8c59c$0$5229$db0fefd9nospam.zen.co.uk... >> I'm still new to this GM / Saab TiD engine, but yesterday I was feeling >> changes in engine behaviour (output) under acceleration. Some times I > have >> plenty of acceleration, sometimes I have next to no acceleration :) and >> it >> was varying. This morning it was find... >> >> It feels just like a petrol turbocharged donk when the ECU shuts down the >> boost pressure because it was getting too high... >> >> I'm thinking an intermittent problem with the mass air sensor, a DTi >> thing >> on UK Vauxhalls and given the TiD's origins, sounds plausable. Is there >> anything else it might be? A collapsed hose somewhere? Crud in the air >> filter? >> > > Unplug the AMM and go for a drive. If its now smooth, albeit down on > power, > but consistent, then yes the issue is 95% with the AMM. I just had a thought about that technique. On the GM engine, it should cause the engine to go into limp home mode, so it'll be very flat and only rev to about 2500rpm (and on a Saab, it'll cause the engine management light to stay on for 6 ignition cycles, IIRC)