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what about the engine speed sensor ......the little sensor mounted where the g/box mounts the engine ??..........blimey Tiger.....sounds like its knackered mate.......tell yer what...ill do yer a favour & take the williams off yer hands for £50.00 ???.......... (well........its worth a try......you never know...he might fall for it !!)
you binned the ICV!??
but it does sound more like the ICV, since the speedo problem would generally make the engine run rough/stall when coasting. if its at a standstill, the ECU is trying to hold a constant idle and the ICV could be broke or sticky.
IT could also be related to your lambda.
so where does the reading for the speed sensor go then ....i know it goes to the control unit (where the coil is) but surley it must end up at the ECU ???? bit of a crude way to get a speed reading...from the speedo ....esp if yer cable snaps !!!!.......does it take it from where the speedo cable joins the g/box ?
thanks ben.......nearly had a williams for £50 till you joined in !!..........he he he !!
the speedo feed is taken from a hall sender on the cable, the sender is just behind the clocks. Its used to inform the ECU that the car is actually moving and its also used to work out mpg, road speed etc for the trip comp (as fitted).
With the engine running get out leaving it in nuetral and pushing the car the engine should rev up to between 1200 and 1500rpm.
The speedo reading doesnt go anywhere near the ignition module, the only signal that goes to and from there is the feed from the CAS, the power to the unit a spur off to the ECU, a feed to the tacho (signal only) and the HT lead down to the dizzy cap.
Anyway the reason for this feed is that when your tanking along then shove the clutch in the engine revs drop and the engine may stall due to the revs dropping to quickly for the ecu to compensate. You may have noticed it with a dodgy cable press the clutch and the revs drop to 600 rpm or something. bWhat shoul happen is the revs will drop then slow around 1500 rpm and gradually come down.
Easy way to see if its a dodgy ICV is to stop at the lights with it revign away then stick it in 1st with your foot on the brake and bring the revs down to where they should sit/slighty under push the clutch in and if the revs shoot back up then up and down again the icv needs a clean. Also check for air leaks into the inlet tract.
My rover used to do that, sometimes if you left it it would rev all the way up to about 5K!! Never sorted it out- just asumed it was an ECU problem. Flogged it to Renault for a top price with absolutely fcuked suspension, 1 key and no stereo/speakers!
Bought a 1.2 16V which was much faster anyway instead hehe
Mines doing this at the me, once youve ragged the car it idles around 1.5k, as soon as you turn the car off and start it again, its fine until you rag it. Mine went down for a diagnostic check at Renault and it was found to be the speed sensor.
Scott Wood mine does exactly the same. How did you get it sorted and where is it? Is it the thing that hooks onto to the back of speedo cable behind the clocks? If it is there is going to be some fiddly soldering. Does anyone know where it is and how I can sort it?
ok then............you must know where the dip stick is !!!??.....(god i hope so...or this is gonna be a long thread)
well....to the right of the dip stick theres a pipe comming out of the inlet manifold......then to the right of that theres a little round black cylinder with a connection block on the top (cant remember the colour of the connector block...could be yellow/could be green) !!! it has a black rubber shroud over the wires !!! thats yer ICV !!!
let me know if yer still stuck & ill take a pic for yer ....god im nice !!
damianshaker,
I havent got mine fixed yet as i aint had the moeny, i was going to ask on here where abouts it goes when i buy the part. Ill try and find the part no for you tonight.
Scott Wood cheers for the reply. Now I know what it is i can finally get it sorted. Its been doing my head in for months!
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