Engine dying

[Ben Nichols 1979]

Hi all

slight mechanical issue. Car running perfectly but when I depress the clutch the revs die away almost immediately and the engine stops. Fires up straight away again though.

If I move the clip on the throttle cable (to increase the idle) it's fine but needs to then idle at circa 1500rpm or higher.

anyone got any ideas?

Cheers

[fresh]

Everything fixed and secure.. lose lead

[16v_paddy]

Sounds like it could be the idle control valve at fault to me

[Ben Nichols 1979]

Thanks Paddy. To elaborate........

1. Tick over is fine when not in gear - I have had to move the adjuster clip on the cable as far forward as it will go though!
2. Driving along all is good as long as the gear change is quick
3. Depress the clutch and the engine dies.
4. Try to get reverse and it dies (gear change takes too long)
5. Coast up to a junction or roundabout and change down and the engine dies.
6. I've looked at the adjustment screw on the stop for the butterfly and the original paint is still intact so sure that hasn't moved.

I tend to agree with you. Is it an expensive/hard job to fix? Are the control valves readily available?

Cheers

Ben

[16v_paddy]

They're common to be gunked up with crap making them sticky so it's worth taking it off & thoroughly cleaning it with brake cleaner and working the flap inside it back & forth then soaking it in wd40

It's not a guaranteed fix but worth a try plus it's pretty much free

[Ben Nichols 1979]

They're common to be gunked up with crap making them sticky so it's worth taking it off & thoroughly cleaning it with brake cleaner and working the flap inside it back & forth then soaking it in wd40

It's not a guaranteed fix but worth a try plus it's pretty much free

Thanks Paddy. Is there a guide to doing it on here? It would make life easier as I am a mechanical spaz!!

[gozziee]

Sorry to butt in but mine idles at 1500ish sometimes, could ths be the same valve ?

[Ben Nichols 1979]

So, I had the idle control valve cleaned and that fixed it for a while. Now it seems the throttle is sticking and goes up to c 4,000rpm when I depress the clutch - when I put it in gear it behaves and idles at 900 ish. When driving in gear it keeps trying to lurch forward and accelerate.

I have replaced the tps so thats all good (with a genuine part)

what else can it be? Its undriveable at the moment

Thanks

[white16valver]

Are you saying that sitting idling in neutral (at 900rpm?) and then depressing the clutch causes it to shoot up to 4000rpm, but if you slot the gearlever into a gear (still with the clutch down) it drops to 900rpm?

Or that when trundling along at low speed in, say, 4th gear, it will happily do so at 900rpm?

[Ben Nichols 1979]

Are you saying that sitting idling in neutral (at 900rpm?) and then depressing the clutch causes it to shoot up to 4000rpm, but if you slot the gearlever into a gear (still with the clutch down) it drops to 900rpm?

Or that when trundling along at low speed in, say, 4th gear, it will happily do so at 900rpm?

so. When I fire it up it will sometimes idle correctly at about 900rpm but sometimes start straight at 4,000 rpm. If I blip the throttle it MAY drop to 900rpm but may stick at 4,000. When driving along and try to change gear it will sometime shoot up to 4,000 when I depress the clutch but when I put it in gear it will go back to normal rpm for that speed in that gear. When I accelerate in gear it's ok. When I get off the accelerator it feels jerky as though it's trying to accelerate. Then, when I depress the clutch to change down the revs will flare and then settle when I select a gear and whole thing starts again.

I tried playing with the throttle in the engine bay to stop it over revving but it doesn't make a difference.

Does that make sense (it doesn't to me but that's what it does)

the tps has been replaced. Idle control valve cleaned. The only other thing is the cable. Or maybe something more sinister .......

any help greatly appreciated as i say its undrivable at the moment.

Thanks

[16v_paddy]

I still think idle control valve is at fault as the only thing that can make the engine rev up like that is something staying open enough to let the air in to do that which can only be the throttle butterfilies or the butterfly inside the IACV

[Ben Nichols 1979]

Great, thanks Paddy. I've been looking around for a new one but can't find one. Any idea where I can get one? Is it also worth changing the cable?

Cheers

[Ayli Carper]

Several used ones on Ebay, it's shared with various 80s Porsches, copies available such as

https://www.ebay.co.uk/itm/JW-Leerlaufregler-Leerlaufregelventil-Leerlaufsteller-fur-BMW-Ref-Nr-0280140524/272857543597?hash=item3f8793b3ad:g:D~YAAOSwK89ZxIK y

or http://www.ebay.co.uk/itm/Porsche-Renault-Volvo-Idle-Air-Control-Valve-LOWE-automobil-repl-9306061600/263028238218?epid=1044827525&hash=item3d3db4678a:g:VhgAAOSwCU1Y0MVK

Which matches the original Bosch part number ARTICLE №: 0 280 140 501

[Ben Nichols 1979]

Excellent. Thanks. Is it easy to fit or a garage job?

[Ben Nichols 1979]

Looks like it's quite simple. More asking about access and the amount of dismantling required to get to it. Cheers.

[Ayli Carper]

I'm afraid I don't know. I looked into this when mine had idling problems but it turned out to be the throttle position sensor. There are some new old stock Bosch ones in the states for over two hundred quid!

[16v_paddy]

It's 2 screws on a bracket to undo, pull off the rubber pipes, unplug & it's all off

[16v_paddy]

http://williamsclio.co.uk/forum/attachment.php?attachmentid=8689&stc=1

[16v_paddy]

https://www.ebay.co.uk/itm/Idle-Control-Valve-Air-Supply-Idle-Control-Idle-Speed-Actuator-280140501/302444668076?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649