hi all have a rough idling running problem
startup seems fine, then as soon as i pull away revs struggle at 500 and then find myself having to switch off and on again then revs run at 2000
anything to clean or reset have checked the wheel speed sensor ok and cleaned the throttle bodies
thanks
+1 Same probs here sometimes.
What ecu are you running? If its the factory one have you tried doing a manual recalibration of the TPS?
no how you do that?
See below - its a copy n paste job that i found a few years ago but it worked for me initially.
To recalibrate the TPS: -
With the engine off, insert the key and turn the ignition to position 2 (On) without starting the engine.
For MEMS-equipped cars, quickly but steadily press and release the accelerator pedal 5 times for TPS calibration, using all of the throttle travel as practicable.
It is better to do this from the engine bay, using the cam on the throttle body, as this ensures you get 0-100% operation of the throttle, and correct calibration, If your throttle cable or mech does not give 100% throttle, calibration will be out. And potentially you will be wasting your time. This will trigger the ECU into the closed-throttle reference learn algorithm, which has it looking for the lowest measured static throttle position (the closed position). The throttle position calibration is a fixed definition from this point.
Turn the ignition off, remove the key and wait for the ECU to power down (about 30-40s).
Start car as normal.
If that doesn’t work I’d look at changing the TPS sensor itself.
I think i’m on my 3rd now since i’ve had the car (5yrs) i’ve kinda looked at it as a consumable item every other year
i pmd you
yeah, nowt wrong with throwing a new sensor one. As has been said they aren’t the most long lasting thing in the world
My TPS was knackered when I put the MoTeC on and could datalog it, it had a dead-spot in the middle.
Strangely mine had the opposite problem on the old Lotus 190 ECU. Once it was warm, it would idle normally… as soon as you rolled forward at more than 5km/h the idle revs would shoot up to about 2500RPM and wouldn’t come down again until you were stopped. It made creeping along in motorway traffic impossible… you’d ease the clutch out and as soon as you were rolling it would catapult you forward and you’d have to basically hold the car back on the brake until you could next bring it to a stop… most annoying!
I never did get to the bottom of it, since I pulled the car off the road about 3 weeks after that started happening and the car next started 2.5 years later with a whole new ECU and loom… been fine since!
I got this problem again
I just replaced the iacv as it was a fault code on the reader
so now I guess I gotta reset the tps or change it
but do I have to change it if appeared to be working ok with the old iacv on
is it just a reset have done the above ie 5 times reset and still having troubles