Vauxhall Astra over reving
Variant: 1.6 club
Model Year: 2001
Categories:
Running Rough, Starting & Power Loss
Hi, My Astra has developed a fault with over reving, when i start the car it idles at 1000rpm as normal, then after drivng for a bit the car idles at 1500rpm, when i depress the clutch the rpm shoots up to over 2000 rpm, only when i put the car in gear and raise clutch pedal halfway does the idle return to 1000rpm before jumping back to 1500rpm when clutch pedal released, any ideas
Posted: Nov 29, 2012 (12 years ago)
I have just fixed our Ford KA, which exhibited the same fault after just a minutes driving. The water temperature sensor for the ECU was partially disconnected.
Assuming that the engine is running correctly with no misfire or irratic idle, my suggestion is to check the connections to this sensor. Also check any multi-block connectors in the engine bay for corrosion/poor connection.
Once the above is ruled out, the next things to try are the idle control valve and the throttle position sensor. These can be removed, cleaned and tested, but you'll need a whole day to do it as these are normally fiddly things to remove.
In summary: suspect electrical connection first, then faulty sensor or idle control valve, then throttle position sensor.
Buy yourself a bluetooth ODB reader (approx £5-£10 eBay), so that you can check the ECU fault data and perform live data monitoring - makes diagnosis so much easier!
Assuming that the engine is running correctly with no misfire or irratic idle, my suggestion is to check the connections to this sensor. Also check any multi-block connectors in the engine bay for corrosion/poor connection.
Once the above is ruled out, the next things to try are the idle control valve and the throttle position sensor. These can be removed, cleaned and tested, but you'll need a whole day to do it as these are normally fiddly things to remove.
In summary: suspect electrical connection first, then faulty sensor or idle control valve, then throttle position sensor.
Buy yourself a bluetooth ODB reader (approx £5-£10 eBay), so that you can check the ECU fault data and perform live data monitoring - makes diagnosis so much easier!
Posted Dec 14, 2014 (10 years ago)
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