Hi, I've got a 1992 106 with 1.0 litre engine and the bosch monopoint fuel-injection system.
It starts off fine, no problems and goes like a charm till I stop. If I then wait, say, 15 minutes, and try to start it up again warm, the car will start fine but stall just as I depress the accelerator, i.e just off the idle stop. If I press down hard enough, though, i can get past this point on the pedal and it will actually rev.! :-)
The only problem then comes when I drive away, as it keeps hitting this "stalling spot" whenever I press the accelerator after changing gears, and so I end up with a mad, hopping kangoroo. However it all seems to clear itself up a few minutes into the journey.
The garage say this is a known fault with the Bosch throttle body installed, but that a new, revised-design one is going to cost £800!!!! I don't want to pay this much, but then again I still don't want to ditch the car just yet, so can anyone think of an alternative solution to the problem (or a new cause) rather than buying a new throttle body? I've already had the damn thing tuned, but to no avail.
thanks for your help.
sincerely
M Farrow
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I'd suggest you try for a good used throttle body (e.g.through Findapart.co.uk) or attempt an internal clean of the resistor tracks on the throttle variable resistor.To do this first mark the installed position of the potentiometer then remove the tamperproof screws (special bit needed).You can then clean up with a mild solvent.I agree the cost of the new part is absurd and I suppose there's fitting and VAT as well!
David Davies (Tune-Up Raglan)
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Hi
Sorry to bring up an old thread, but the stalling thing is getting worse. It still only happens after it's been stopped awhile, but it keeps doing it and needs a lot of left boot to keep it going sometimes! It also stalls sometimes when hot and idling, though I think this is related to the throttle problem as the throttle uses the potentiometer to keep the idle speed correct.
Does anyone know of a place where the throttle body may be reconditioned for a reasonable price?
Cheers
Mike Farrow
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Have a look at Saxo surging on same page. Ref to removing 5amp fuse (just in front of battery)
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Thanks for that Carl2, It hasn't had any components replaced any time, so I doubt it's a simple reset problem.
I've had half a brainwave. Is it possible to transplant a carburettor onto this engine? Would this foul the emissions and running of the ignition system? I imagine the cat would have to be removed.
Cheers
Mike Farrow
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Pre '93 on a "K" doesn't legally need the cat.
If you fitted a carb the cat would soon be killed. Your insurerers might not be too amused.
As an aside, if your throttle body is the Bosch one I'm thinking of - there are two potentiometers(!) one is effective for the first 20 odd degreees, there is a bit of overlap, and the second one does the balance of the 90 or so degrees. It's trying to simulate a twin choke carb...
There is an internal microswitch for "throttle closed" which tends to go high resistance, and there is a fudge to "wet" the contacts, and restore some life in the thing using a bulb as a load.
Let us know if it is a Bosch unit and I'll look up the contacts and procedure later.
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Thanks for that John, it is indeed a Bosch system, Monopoint MA3.0.
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OK.
Bosch single point.
The connector for the stepper motor and "shut throttle switch" and wiring to rejuvenate the contacts looks like this:
tinyurl.com/3npul
The Anglicised version of the Italian original text goes something like this:
With key in run position verify connection between pin 3 and engine earth is present:
with pedal accelerator in position of rest the voltage have to be 0,3 - 0,5 volt
with pedal accelerator pressed the voltage should go to 12 volt ( some are 5 volt)
If the minimum voltage is not stable it is possible to clean the switch contacts by using a 21watt bulb wired as in the diagram.
By operating the switch with this load the contacts are cleaned.
Also check that the butterfly position is correct, allowing the switch to close when the stepper motor is at its minimum position. ? ensure the throttle cable is not too tight.
When the stepper motor is in its minimum position there should be a gap of 2 tenths of a millimetre between the butterfly pivot and the stepper lever.
If you have really good Italian translation look here:
tinyurl.com/4oh8h
There is information about the potentiometers too.
Hope this helps.
Regards
John H
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I was thinking about the possibility of a sensor failing within its set point. Although it does seem to look like a potentiometer problem in your case ( and possibly mine). Have been in a state of depression since I read your account of the price of this item. My escort potentiometer cost £27 and took me 5mins to fit so I was not really expecting pay anything like this price. I was thinking of contacting www.bba-reman.com for a price if I do need one and can not get one from a breakers.Good luck
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Meant to add that my fuse pulling idea has proved to be a non starter but I now wonder about above sensor possibility.
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The stepper is just a simple 3bolt replacement . Is there a clean up for the potentiometer?
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Hi
Thanks for all the info chaps. Just learnt that a garage tried cleaning up the potentiometer a couple of years ago, but it didn't make much difference.
The only thing to do now is to get the throttle body remanufactured. Have one price so far from BBA for £195 + VAT. Though not a bad price, does anyone know of any other remanufacturers whose price will be competitive?
Also, may replace the head gasket as it's got oil in the water. Any tips for doing this. I've been reading another thread which recommended heaving the head skimmed. Do you think this is worth doing? If so, any good machining shops in the Coventry area?
Sorry for all the questions!
Mike Farrow
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Fmarrow: Have you posted this on the BBA forum I do not think it is a throttle body problem. Regards Peter
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Hi Peter
Thanks for your suggestion, have done as you said and posted on BBA. You say you don't think it's the throttle body, any idea what it could be?
Just for clarity, the head gasket problem has started recently, after the initial stalling problem begun!
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Well if the head gasket is away then I would fix that first then re address the throttle problem. If the read is marked or warped and it goes away then it will give you time to clean the body and thoroughly test the Pot and switch. How much oil is appearing in the water and you you have any enulsion in the Oil filler cap. ?? Regards Peter
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Hi
Well the latest twist to the tail is that it won't be having any money spent on it at the moment because it's just needed a new cat. costing over £150!
But I'll keep this thread in mind for when the time comes.
Cheers
Mike Farrow
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