Fiesta 1.3 engine query.

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Fri 5 Nov 2004 00:34
Fiesta 1.3 engine query. - Steveo4869
Hi all.
Just a quick question. I know this has been covered on many previous threads (which I can't seem to find) but I am going to fix an idle problem on the missus 1996 Fiesta 1.3LX (Endura-E Engine) tomorrow. The problem is the revs will not decrease when slowing and/or putting your foot on cluth/brake and seem to increase.

I am thinking it is the idle control valve at fault and have cleaned it but to no change in the fault. My real question is could there be anything else at fault before I shell out £70 on a new valve?

And also could it be a switch of some sort on the clutch because I am intrigued to know how the engine (A perfect Working engine) knows to cut the revs to idle when you press the clutch pedal? Any advise very much appriciated. Oh and ok it wasn't such a quick question sorry!

Steveo
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Fri 5 Nov 2004 00:44
Fiesta 1.3 engine query. - Dynamic Dave
Re, the revving:

Try Andrew's suggestion of pulling the ECU fuse....

www.honestjohn.co.uk/forum/post/index.htm?v=e&t=21...4


You're right, the clutch does have a switch on it....

www.honestjohn.co.uk/forum/post/index.htm?v=e&t=15...7

Also, this thread *might* help....

www.honestjohn.co.uk/forum/post/index.htm?t=15179

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Fri 5 Nov 2004 10:21
Fiesta 1.3 engine query. - Steveo4869
Many Thanks DD. Very helpful. Thanks again
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Tue 9 Nov 2004 00:22
Fiesta 1.3 engine query. - Steveo4869
Just a quick update on this problem. After many hours on Saturday trying to fix the problem with no success, I gave in and took the car to a local garage to sort out.

It ended up being a wire on the Throttle Position Sensor which had previously broken and someone (before I owned the car) repaired the wire by using a screw type terminal/choc block to make the connection.

So after a simple piece of soldering (which I could have done had I known) by the garage and £54 (A tad steep I feel) later it solved the problem.
The mechanic said the choc block was sending a high resistence current back to the ECU thus causing the high revving. Not sure what he meant by this could anyone explain (if they know) in more detail please.

Many Thanks

Steveo
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Tue 9 Nov 2004 11:14
Fiesta 1.3 engine query. - Carse
Steve,

The TPS (throttle position sensor) is in fact a variable resistor, the position of the throttle relates to a resistance fed back to the ECU. The ECU reads that resistance as the position of the throttle pedal and therefore injects fuel and allows air through the MAF in relation to what the ECU thinks the driver is demanding.

Therefore if the TPS was high resistance, the ECU believes the driver has his foot down and therefore acts accordingly.

Hope this helps

C.
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Tue 9 Nov 2004 13:35
Fiesta 1.3 engine query. - Steveo4869
Many Thanks Ca***.

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Tue 9 Nov 2004 13:38
Fiesta 1.3 engine query. - Ford Dagenham
ca***.

C*A*R*S*E

The filter thinks steve is swearing.
--
(iam not a mechanic)

Martin Winters
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