Zetec Crank Position Sensor

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Nigel Plant

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Jul 1, 2017, 7:51:20 AM7/1/17
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Have rebuilt an engine for my zetec xtreme, but cannot get it started. The Omex ECU is not seeing the CPS signal. Have checked all wiring, sensor and signals. Have put an oscilloscope at the ECU end of the wiring and although getting a signal of sorts it is very noisy. I finally decided to check the flywheel holes line up with the sensor hole and it seems there is about 2 or 3mm offset.

Now the question. The new engine is from an automatic. Flywheel etc from my old engine. Can anyone tell me conclusively if the automatic CPS is in a different position to the manual one. A bit if googling indicates it is, so looks like engine out again. Ouch.

Nigel

Steve Kodź

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Jul 1, 2017, 8:00:14 AM7/1/17
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Could you not use a CPS from the automatic?

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Ian Harrison

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Jul 1, 2017, 8:41:52 AM7/1/17
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I'm pretty sure I've read that they are different on automatics Nigel.

Ian

On 1 July 2017 at 13:00, Steve Kodź <st...@h4-turbo.co.uk> wrote:
Could you not use a CPS from the automatic?

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On 1 July 2017 12:51:29 Nigel Plant <nige...@gmail.com> wrote:

Have rebuilt an engine for my zetec xtreme, but cannot get it started. The Omex ECU is not seeing the CPS signal. Have checked all wiring, sensor and signals. Have put an oscilloscope at the ECU end of the wiring and although getting a signal of sorts it is very noisy. I finally decided to check the flywheel holes line up with the sensor hole and it seems there is about 2 or 3mm offset.

Now the question. The new engine is from an automatic. Flywheel etc from my old engine. Can anyone tell me conclusively if the automatic CPS is in a different position to the manual one. A bit if googling indicates it is, so looks like engine out again. Ouch.

Nigel

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Ian Harrison

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Jul 1, 2017, 8:44:08 AM7/1/17
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THis thread states the CPS is the same, but the housings are different between auto and manual. Using the manual housing should sort it.

Ian


Nigel Plant

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Jul 1, 2017, 10:26:44 AM7/1/17
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Thanks guys. Thats what Id found too, was clinging on to the slim hope it may be wrong abd the engine did not have to come out. Have now looked at housings and are quite different. Oh well guess what Im doing tomorrow. Castle Combe is looking iffy!!

Jim Hearne

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Jul 2, 2017, 4:55:53 AM7/2/17
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Sorry Nigel, the automatic crank sensor mounting is different to the
manual.
The sensor is the same but the aluminium bracket it fits into that then
fits into the hole in block is quite different.
And, of course the bracket is fitted from inside the bellhousing.

http://locostbuilders.co.uk/upload/2tps%20housing.jpg
http://www.kilmartin.it/gallery/picturegallery/crank-trig-hous.jpg

Jim

Susan and Martin Scott

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Jul 2, 2017, 12:35:14 PM7/2/17
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Thinking at a tangent..... would it be possible to machine an adaptor that
can be mounted on the outside, yet still achieve the correct position for
the sensor?
Martin
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Steve Kodź

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Jul 2, 2017, 12:55:54 PM7/2/17
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All the CPS sensors I've seen are plastic cased, so probably not.

Regards,
Steve
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On 2 July 2017 17:35:22 "Susan and Martin Scott"

Nigel Plant

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Jul 3, 2017, 4:49:25 AM7/3/17
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The engines out, housing changed. Need to out flywheel back on and double check then engine in mid week.
Housing photo attached. Not even close!!! Kicking myself!!!


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20170702_164248.jpg

Susan and Martin Scott

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Jul 3, 2017, 6:30:01 AM7/3/17
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Crikey they are heavy - a strange set of scales you have there as well!
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Ian Harrison

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Jul 3, 2017, 6:31:39 AM7/3/17
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That nearly made me spit my coffee out... :-)

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Nigel Plant

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Jul 4, 2017, 2:32:46 AM7/4/17
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Laughing. Hadn't realised my accurate positioning if the housings. Purely unintentional, but funny.
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