Idling speed too high then drops if accelerator blipped.

martin calva · Jun 24th, 2024, 22:13

Hello,

Mydiesel 2.4 TIC 1984 940 estate is running fine, as it always has (some suspension vibration problems excepted). After I have been driving, if I bring the car to a halt the engine revs stay at about 1200 - 1300 rpm. If I then blip the accelerator, most times the revs drop to a more normal idling speed - about 800 rpm.

What should I check to correct this? It feels as if some throttle part is staying too far open and is not being correctly returned by a spring. (Just guessing and saying what it feels like to me.)

Any suggestions will be gratefully received.

Martin

Baffler · Jun 29th, 2024, 19:34

I can't remember the set up on these, Martin, but, if I'm not mistaken, these have a throttle cable so I would be checking to see it's moving easily without restriction, perhaps try get some ground graphite into the inner cable while you have it detached, and also check everything is moving freely where the cable is attached. I recommend ground graphite as it doesn't attract dust like an oil based lubricant.

Jun 24th, 2024, 22:13	#1
martin calva Senior Member Last Online: Jun 27th, 2024 23:15 Join Date: Apr 2015 Location: Falaise	Idling speed too high then drops if accelerator blipped. Hello, Mydiesel 2.4 TIC 1984 940 estate is running fine, as it always has (some suspension vibration problems excepted). After I have been driving, if I bring the car to a halt the engine revs stay at about 1200 - 1300 rpm. If I then blip the accelerator, most times the revs drop to a more normal idling speed - about 800 rpm. What should I check to correct this? It feels as if some throttle part is staying too far open and is not being correctly returned by a spring. (Just guessing and saying what it *feels* like to me.) Any suggestions will be gratefully received. Martin

Jun 29th, 2024, 19:34	#2
Baffler Premier Member Last Online: Yesterday 15:03 Join Date: Dec 2002 Location: Co. Limerick, Ireland	I can't remember the set up on these, Martin, but, if I'm not mistaken, these have a throttle cable so I would be checking to see it's moving easily without restriction, perhaps try get some ground graphite into the inner cable while you have it detached, and also check everything is moving freely where the cable is attached. I recommend ground graphite as it doesn't attract dust like an oil based lubricant. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

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