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Engine running after the ignition off

Started by _lxtoranafan_ , Oct 28 2008 07:42 PM

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14 replies to this topic

#1 _lxtoranafan_

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Posted 28 October 2008 - 07:42 PM

I've got an LX with 202 motor.

Recently I have experienced problems with the engine running (up to approx 30 seconds) after the ignition is turned off.

Does any one have any ideas on what causes this?

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#2 rodomo

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Posted 28 October 2008 - 07:49 PM

Idle speed too high.

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#3 Litre8

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Posted 28 October 2008 - 07:51 PM

Crap fuel, timing too advanced, carbon buildup on piston/chanber are some that come to mind. Is it running on normally or 'dieseling' in reverse direction?

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#4 LX2DR

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Posted 28 October 2008 - 09:24 PM

Pre-ignition, butterfly in carbie isn't shutting completely allowing fuel to be drawn in and ignited by build up glowing crap in combustion chamber.
Mine used to do it, adjusted the carbie properly, hasn't done it since.
The idle solenoid might not be touching the throttle plate but on the other side at the choke plate the screw might be holding the throttle open still.

Also stop it from happening, it can damage the engine,
I got the missus to leave the car in drive while turning it off, the engine was pulled up quickly.
If it's a manual, leave it in gear and lift the clutch pedal as you turn it off to pull the engine up.

Edited by LX2DR, 28 October 2008 - 09:30 PM.

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#5 _gtrtorana_

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Posted 28 October 2008 - 10:04 PM

My engine used to have this problem with the single carb but now I have the tripples on it does not do it unless I have been giving her a hard time. Like LX2DR said, you have to stop the engine doing this as soon as possible. I used to put the car in 4th (manual) turn igntion off and release clutch at the same time.

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#6 Collo

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Posted 29 October 2008 - 05:52 AM

My Hb does this a little if i turn it off as soon as i pull up somewhere.
But if i let it idle for maybe 5 or so secs before switching off it stops normally.

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#7 _torbirdie_

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Posted 29 October 2008 - 06:13 AM

The idle solenoid might not be touching the throttle plate but on the other side at the choke plate the screw might be holding the throttle open still.

As mentioned by lx2dr, the operation of the solenoid needs to be checked, your lx should have this fitted. It is actually known as the anti-dieseling solenoid, though its not incorrect to call it the idle solenoid. It works by allowing the throttle to close well beyond the opening for base idle and basically shut the air supply off for combustion. When the ignition is on the solenoid provides the throttle stop for the idle position. It can be adjusted by screwing out or in the hexed end.

It could be that yours is in need of adjustement, or is stuck in the engaged position(rare), or that for some reason the throttle return spring has weakened and or the throttle wont return to the closed position.

A preliminary check is when you turn the ignition to on, you should feel the throttle pedal move in slightly under your foot. If you feel nothing thats most likely where your problem is.

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#8 rodomo

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Posted 29 October 2008 - 02:03 PM

It works by allowing the throttle to close well beyond the opening for base idle and basically shut the air supply off for combustion.

Not quite right. It allows the throttle to close to the base idle position, 450-500rpm, which is adjusted at the hex screw that contacts the choke high idle cam.

Edited by rodomo, 29 October 2008 - 02:06 PM.

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#9 _SableMet7/73_

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Posted 29 October 2008 - 05:23 PM

Gday all
Mine only runs on when I use 91 which isnt very
often. Only when I'm a bit tight arsed.
Dont have any problem with 95 or 98 in either the
Monaro or the Trana.

Jono

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#10 _lxtoranafan_

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Posted 04 November 2008 - 08:21 PM

I take on board the comments about the carbie and idle solenoid and will need to check these out further, however I would like to discuss the issue of fuel a bit further.

Since the car is a reasonably new acquisition, the times I have filled up have been using regular unleaded petrol.

I now find that the servo I normally go to has replaced it�s regular unleaded pumps with E10 unleaded pumps, so I guess this is a good time to consider my options with regards to the use of premium unleaded petrol.

So please tell me if you are running premium unleaded petrol in your car and if so, what brand / type would you recommend?

Also would using a premium unleaded petrol reduce or eliminate the engine idle after ignition off problem?

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#11 mr5000

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Posted 04 November 2008 - 08:31 PM

i use bp ultimate or mobil 8000

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#12 _torbirdie_

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Posted 05 November 2008 - 05:13 AM

I take on board the comments about the carbie and idle solenoid and will need to check these out further, however I would like to discuss the issue of fuel a bit further.

Since the car is a reasonably new acquisition, the times I have filled up have been using regular unleaded petrol.

I now find that the servo I normally go to has replaced it�s regular unleaded pumps with E10 unleaded pumps, so I guess this is a good time to consider my options with regards to the use of premium unleaded petrol.

So please tell me if you are running premium unleaded petrol in your car and if so, what brand / type would you recommend?

Also would using a premium unleaded petrol reduce or eliminate the engine idle after ignition off problem?

Fuel with a higher octane rating(premium unleaded) is less likely to selfignite.

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#13 LX2DR

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Posted 05 November 2008 - 11:00 PM

Pre-ignition, butterfly in carbie isn't shutting completely allowing fuel to be drawn in and ignited by build up glowing crap in combustion chamber.
Mine used to do it, adjusted the carbie properly, hasn't done it since.
The idle solenoid might not be touching the throttle plate but on the other side at the choke plate the screw might be holding the throttle open still.

Also stop it from happening, it can damage the engine,
I got the missus to leave the car in drive while turning it off, the engine was pulled up quickly.
If it's a manual, leave it in gear and lift the clutch pedal as you turn it off to pull the engine up.

Just remembered :blink:

the other thing that was exacerbating (Midnight and still big words :huh:

) my problem was a huge air leak between the head and manifold at the centre port, little or no pressure on the gasket.

Same symptoms as if a carby problem, anything that lets air into the system.

I dismantled the manifolds, replaced the hotbox gasket (Still get them from Repco, i'll post the gasket number tomorrow) and reset the intake so it was just a touch proud of the exhaust manifold faces.

I used a spare head, set it all up with a thin shim across the exhaust ports then tightened it all up at that, so with this and ^^^ been perfect ever since.

Stops dead, hot or cold & think it starts better too & running only on regular ULP.

Edited by LX2DR, 05 November 2008 - 11:01 PM.