symptoms of a duff throttle pot
Discussion
Meatball said:
How would i know its playing up? Lots of part throttle shunting? poor throttle response?
Hi Ben,why dont you open up TunerStudio and open up Tools/Calibrate TPS then look at the second box out and slowly squeeze the throttle to see you are getting a nice linear value sweep with no drop outs or glitches perform this both hot and cold as the TPS rheostat can fail during temp fluctuations,how do i know this?....... because I had this very part fail when I was running the CUX system years ago Edited by Meatball on Sunday 1st May 16:04
it was a complete b
h to track down as by the time you popped the bonnet and checked the values it would behave itself(perfect linear value)it only showed on my 3rd attempt off the car and even then I at to wait for the problem to get worse(more track wear)in saying all this it did not cause any shunting just random dropping out of power under constant throttle i.e A roads and Motorways 
it may do it during an 1/2 journey sometimes not for a couple of days 
still woth checking though in case yours as worn lower down the scale,fortunately I purchased a genuine 1 from my local LR agent for about £65 trade they have since gone up considerably,although I think one of the TVR specialist's as them reasonably priced at the moment 
Hi Simon,
I did try the tuner studio route and it does appear to be a smooth sweep, but the pot im using had to be repaired due to the wire snapping as it enters the body....guess the repairs not repaired
The shunt as i called it feels like the engines cutting the fuel, then as i pump the gas to recover it springs back to life.
the fun and games carry on.
BTW ive got a nice 1000rpm idle now
I did try the tuner studio route and it does appear to be a smooth sweep, but the pot im using had to be repaired due to the wire snapping as it enters the body....guess the repairs not repaired
The shunt as i called it feels like the engines cutting the fuel, then as i pump the gas to recover it springs back to life.
the fun and games carry on.
BTW ive got a nice 1000rpm idle now
Hi,
I had a faulty trottle pot, symtems were car cutting to idle with gas pedel down then suddenly cutting back in.
It was found by diagnostic guys fitting there onboard thing! and going for a drive, it would somtimes go miles with no problem then start. Pain in the arse.
Hope this helps.
Cheers
I had a faulty trottle pot, symtems were car cutting to idle with gas pedel down then suddenly cutting back in.
It was found by diagnostic guys fitting there onboard thing! and going for a drive, it would somtimes go miles with no problem then start. Pain in the arse.
Hope this helps.
Cheers
minkybob said:
Hi,
I had a faulty trottle pot, symtems were car cutting to idle with gas pedel down then suddenly cutting back in.
It was found by diagnostic guys fitting there onboard thing! and going for a drive, it would somtimes go miles with no problem then start. Pain in the arse.
Hope this helps.
Cheers
Yep,thats the one I had a faulty trottle pot, symtems were car cutting to idle with gas pedel down then suddenly cutting back in.
It was found by diagnostic guys fitting there onboard thing! and going for a drive, it would somtimes go miles with no problem then start. Pain in the arse.
Hope this helps.
Cheers
Ben have you tried running a Datalog session 
could try running Diagnostics too as it's all there with TunerStudio may take a while to analyse the data I find but always worthwhile better than watching CreaseEnders or Corrie anyway Edited by Simon says on Sunday 1st May 19:28
Meatball said:
Been tinkering in the man cave, the throttle pot wiring is starting to get very brittle....my earlier repair was fine but it had frayed/snapped further down now by the connector under the plenum. Ill give her another run tommorow and see if shes ok.
Thanks for the help chaps
No problem Ben,think your in the right area anyway Thanks for the help chaps
was looking (closer 
)on the tuner studios again and it looks like the pots jumping and loosing resistance if i add pressure very slowly, it seems to jump forward 10% around the first 1/3 of the rev range. Its also dropping back a touch to, so im going to try a new pot...where the cheapest place to get one?
)on the tuner studios again and it looks like the pots jumping and loosing resistance if i add pressure very slowly, it seems to jump forward 10% around the first 1/3 of the rev range. Its also dropping back a touch to, so im going to try a new pot...where the cheapest place to get one?Pupp said:
Emerald used to do some generic ones at a reasonable price but I'm not sure how easily they would mate with the Rover throttle spindle and fastener holes. Post up what you do source as I need one!
Flea bay cheaper than most. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...
To be honest you don't need to get as involved as using a scope to diagnosis for what is nothing more than a rheostat,it's simulating the temp/throttle position where the fault occurs that's the hard bit 
Ben if your not getting a nice linear action in your TS logs then you have found your fault be it poor wire connection worn TPS inner tracks etc
Ben if your not getting a nice linear action in your TS logs then you have found your fault be it poor wire connection worn TPS inner tracks etc Gassing Station | Chimaera | Top of Page | What's New | My Stuff