ZX TD Engine Cutting Out

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Chlorate
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ZX TD Engine Cutting Out

Post by Chlorate »

Recently my engine has been doing something rather odd.
That is: when I'm going down a steep hill, slowing down. Then if I declutch, the engine stalls.
It is only momentarily, because lifting off the clutch bump starts it again.
But it's pretty odd. Can anyone think of anything that could cause that?

Since it only happens when I'm slowing down on steep hills I'm wondering if it's because all the fuel in the tank rushes to one end and the pump just gulps air.

Cheers guys.
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citronut
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Post by citronut »

not sure on you fault but

Chlorate
"because lifting off the clutch bump starts it again"

this is not good practice in a diesel as you can shater the clutch plate

regards malcolm
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Post by citroenxm »

Could be a faulty damper on the injection pump not damping the throttle enough, or the idle is in correctly set..

Being a TD, I assumue a Bosch Pump, on the back of trhe pump nearer the head there should be an Orange Damper (Or it could be a gas strut on the front,) Pull the throttle lever to the righ as though you are putting you foot on the acceleration, then let go, as it returns as it hits the damper it should slowly return to rest - like a door closure system...

Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
Peter.N.
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Post by Peter.N. »

...or could be that your fuel filter needs changing.
Chlorate
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Post by Chlorate »

Uhh Malcolm...why would that shatter the clutch plate?
I can't really see why the clutch would be under any more stress than, say, hill starting...

Ohhh...so that's what that damper is for :oops:

I changed my fuel filter the other month after doing the HG job.
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citronut
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Post by citronut »

Chlorate wrote
"I can't really see why the clutch would be under any more stress than, say, hill starting..."

do you snatch the clutch pedel up when you hill start then,

there is an aufull lot of snatch on the clutch plate if/when bump startting a diesel,

i had to fit a new clutch to a customers diesel BX years ago, after he had been bump startting it for weeks because the glow plugs needed changing,

when i removed it it was completely shatterd,


regards malcolm
Peter.N.
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Post by Peter.N. »

There is an anti stall adjustment on the pump, I can't remember exactly how it works but its to do with the relationship between the two levers on the pump, the main throttle and the cold start , you should be able to adjust the rate it which the engine slows when the throttle is closed - I have just found it in Mr Haynes book, it depends which pump you have but gives info for both. you will find an adjustment called 'anti stall'

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Post by Chlorate »

Yeah, I think I've seen it. Little screw thing at the back that sets the stop for the accelerator arm.
Unrelated, but I think my cold start bit may be knackered also.
Ah well.
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Post by Stunned Monkey »

Big difference between bumping it from cold at slow speed, and simply bringing the clutch back up when travelling at 30+ mph with a hot engine - then it's only the same as downshifting, in fact that's pretty much when it happens (I was with Alex in his car when it did it yesterday going down the long hill into Eastbourne)
Last edited by Stunned Monkey on 03 Dec 2009, 15:09, edited 1 time in total.
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2008 Peugeot 207 Sw 1.6 16v hdi. 217k and rising
2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
x 70

Post by citroenxm »

What years' the ZX?? Pre keypad immobiliser or has she got an immobilser keypad to start the car??

Ive a VERY GOOD low milage injection pump off a car WITH Keypad immobiler - its done about 90k... no good to me as my DERV is a NON Keypad car..

Pumps rather easy to change, theres NO NEED to take the cam belt off either..


Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
Chlorate
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Post by Chlorate »

It's a '94 but without a keypad.
I wondered how they immobilised diesels actually. I'm guessing there are some different electronics operating the stop solenoid?
Citroen Xantia Exclusive HDi

previously:
Citroen ZX Volcane - RIP
Peugeot 106 XN... stolen and destroyed by Kent Police :evil:
Peter.N.
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Location: Charmouth,Dorset
My Cars: Currently:

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C5 X7 VTR + Hdi Estate 2008 Red

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 1199

Post by Peter.N. »

I think the stop solonoid is just connected to the live ignition circuit - it is on my XMs
citroenxm
Posts: 8061
Joined: 30 Dec 2004, 23:10
Location: Somewhere in North Wales, Anglesey
My Cars: M reg Xm S2 2.1td Auto Exclusive. 269k and rising
L reg XM S1 V6 12v Manual SEi
L 94 XM 2.1 TD auto total resto

2008 Peugeot 207 Sw 1.6 16v hdi. 217k and rising
2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
x 70

Post by citroenxm »

Almost Peter,

With a keypad immobiliser, there was an ECU also added and the code in the keypad tells the ecu to open the stop solinoid, but also the advance timing and cold start are also electronically controlled by the ECU.

Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
RichardW
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Post by RichardW »

Not quote Paul. The immobiliser function is (can be - not sure about later ones) independent from the ECU - my 97 had a mechanical pump and key pad. Basically they put the stop solenoid under some armour plating (see Mike T's blog about dismantling the pump) and then built in some electronics. The electronics talk to the key pad and if the two agree on the code, it puts power on the stop solenoid. The odd thing is that if the keypad is not connected the electronics never get the message that the ignition has been turned off, and allow the solenoid to powered up and down at will :lol:

I don't even want to think about how the immob works on an HDi.... hope it never goes wrong :twisted:
Richard W
citroenxm
Posts: 8061
Joined: 30 Dec 2004, 23:10
Location: Somewhere in North Wales, Anglesey
My Cars: M reg Xm S2 2.1td Auto Exclusive. 269k and rising
L reg XM S1 V6 12v Manual SEi
L 94 XM 2.1 TD auto total resto

2008 Peugeot 207 Sw 1.6 16v hdi. 217k and rising
2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
x 70

Post by citroenxm »

Fair enough Richard, it was a off the head own description...

As for HDi inition, the Transponder pickup is simply attached to the side of a standard ignition switch, behind the steering cowlings, which then goes to the "Central" computer, behind the passenger air bag, which then goes out to the engine bay via a route behind the DRIVERS wing and into the ECU.. which when it sees the correct trasponder key opens the ECU..

This means, you NEED to have: The Key as the chip is in the KEY NOT the plip, the central computer, the Chip Pickup off the ignition barrel, easyilly removed, AND the ECU to be a matched pair!! Much more complicated, which is what is putting me off the HDi XM project a bit... but, we shall still see..

Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
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