seanoVR 0 Posted July 30, 2004 I m have a niggling problem with my car which only happens on motorways when i'm driving above 80mph. If i go up to about 95 and then slowly lift off, the car "jolts" almost like something is cutting out?? The engine is not cutting out but something definitely is as it is not smooth. It kind of buckles and this feels a bit dangerous when i've got someone up my arse as it is almost as if the car is braking but not in a controlled way that you would expect from simple easing off. Has anyone got any ideas on this as i would like to get it right. Thanks in advance Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted July 30, 2004 Plug it into VAG-COM if you can, but suspect the MAF. Look for fuel trim errors. Trouble with the MAFs is when they go, the ECU doesn't care. All it's interested in is if it's connected, not what the output signal is. So although it could be plugged in and look fine, the ECU could be ignoring it and then an overly rich fuel trim for idle and a weak one for high rpm will have be 'learned in' to the ECU. Try resetting the ECU and see if it improves matters. Quote Share this post Link to post Share on other sites
seanoVR 0 Posted July 30, 2004 Cheers Kev. How do i go about resetting the ECU?? Is it a simple procedure? I'm sure i've read about it somewhere involving disconnecting the battery and something else.... Thanks very much Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted July 30, 2004 Yeah you disconnect the battery for 15 minutes. Reconnect it, let it idle for 5 mins and then take it for a drive, which include bursts of full throttle acceleration. I don't know what the *actual* buffer clearing time is, but most people go with 15 minutes. My battery is off as we speak as I've been getting similar symptoms for the past fortnight. No urge, rough idle, stalling and running hot. All symptoms of the sodding MAF. I can usually tell when the MAF has gone because the engine feels heavily retarded and the exhaust note changes. Feels like someone has crammed a pair of socks up the exhaust and it can't breathe properly! Quote Share this post Link to post Share on other sites
seanoVR 0 Posted July 30, 2004 Cheers Kev. Have done as you said and taken it for a spin down the dual carriageway. Seems fine, although with the problem being intermittent, i will need to get it on a long distance motorway journey and see how it behaves!! Fingers crossed. Cheers Quote Share this post Link to post Share on other sites
