Hesitation and throttle position sensor probs

[xain]

Hi all, I've been having a slight problem with my 5.0 when it's just started. It almost dies if you *just* take it off idle, then picks up. It makes pulling out of a parking space tricky. A bit of investigation revealed that the throttle sensor actually goes up in resistance a bit before it drops smoothly as you move it off closed throttle. I fiddled round with it until the measurements looked better, but it didn't change the engine problems. Anyone else had similar problems? It's almost unnoticable after a short warm up, but it will occasionally die when you pull slowly away with very little throttle. I've checked the resistance of the HT leads, all around 10K and the distro cap is clean. Any suggestions? Cheers

[GreenV8S]

quote:Hi all, I've been having a slight problem with my 5.0 when it's just started. It almost dies if you *just* take it off idle, then picks up. It makes pulling out of a parking space tricky. A bit of investigation revealed that the throttle sensor actually goes up in resistance a bit before it drops smoothly as you move it off closed throttle. I fiddled round with it until the measurements looked better, but it didn't change the engine problems. Anyone else had similar problems? It's almost unnoticable after a short warm up, but it will occasionally die when you pull slowly away with very little throttle. I've checked the resistance of the HT leads, all around 10K and the distro cap is clean. Any suggestions? Cheers

Yes, you need a new throttle pot (£70 plus labour to fit and calibrate it). Cheers, Peter Humphries (and a green V8S)

[xain]

You *are* joking, right? 70 quid for a flipping variable resistor? That's about 35 pence from Maplin. Man for that money I'm cracking the thing open and fixing it by hand! Is it any wonder people complain about running costs on TVRs with this kind of mark-up? I think a bit of Liquid Gold WD40 wouldn't go amiss here...

[GreenV8S]

quote:You *are* joking, right? 70 quid for a flipping variable resistor? That's about 35 pence from Maplin. Man for that money I'm cracking the thing open and fixing it by hand! Is it any wonder people complain about running costs on TVRs with this kind of mark-up? I think a bit of Liquid Gold WD40 wouldn't go amiss here...

That maplin resistor will last about ten minutes in there! The environment is very harsh, with heat, vibration, water, oil, dirt and so on as well as continual motion (not like a volume control where you set it and leave it). Earlier ones had silver plated connectors, overkill you might think but these suffered from corrosion problems and were replaced with gold ones which last better. Try a DIY one by all means, but I suspect you will find that £70 is money well spent. Cheers, Peter Humphries (and a green V8S)