Focus MK1 1.8 petrol Zetec

[Southie]

I know this is a Nova forum but you guys know your stuff so just picking your brains.

I'm currently having issues with my wife's focus, it's an on off problem with the temperature gauge and erratic idle.

Basically every so often the temperature gauge reads at the bottom or even a quarter when idling, once warmed up it will rise but then all of a sudden it will drop back to the minimum... Then the revs will increase to about 1.5k to 2k on tick over.
If I then turn the ignition off and back on the gauge goes back to halfway and will be okay again.

I've checked for split pipes and cannot see anything obvious, so I was maybe thinking its the thermostat or icv.

Btw I'm no mechanic so these are only guess work, so any help from you guys would be appreciated.

Thanks
David

[Andy]

cts did one on a friends,not so long back #myvote

[Andy]

that was proven on a picoscope byw not just a karpark kev bodge up effort

[Southie]

Where's the cts on these engines Andy?

[Southie]

Also how much are they, and could I do this myself without photoshop lol

[Andy]

top of the head/rocker cover,like a spark plug hole.About £15 iirc.Just need a deep socket,we used an impact 1/2inch job

[Southie]

Not sure where you mean mate, I'll upload engine bay pics of the car so you can point me in the right direction ;)

[Southie]

http://i345.photobucket.com/albums/p379/SOUTHIE01/null-7.jpg

http://i345.photobucket.com/albums/p379/SOUTHIE01/null-6.jpg

http://i345.photobucket.com/albums/p379/SOUTHIE01/null-4.jpg

http://i345.photobucket.com/albums/p379/SOUTHIE01/null-3.jpg

[Andy]

I see,different style to what we did..il have a search online see if I can find where its located

[Southie]

Did the car you worked on do this now and again but not all the time then Andy?

[Andy]

yeah,cut out at junctions and then raced on idle etc

[Andy]

I cant seem to find a pic dave

[Asa-James]

http://i345.photobucket.com/albums/p379/SOUTHIE01/null-7.jpg



any plugs around the underside of the black housing on the side of the block? check that for leaks while you are there, they distort over time, have changed a fair few of them. struggling to remember where the cts is tho. i second that vote btw

edit - whip the cam cover off, possibly between plug holes...

[Andy]

its definitely between plug holes,glad you said that asa,least im not losing it lol

[Southie]

Cheers Asa, is it a straightforward part to swap then and will I need another rocker gasket?

Do the ford guys call them a cts as I can't find info on it apart from someone mentioning a cts at the back of the block under the alternator... The other place is next to the coilpack but I don't have one there as its blank.

Also I hate working on cars but also hate having to get my head around a Ford layout.

Andy, you are mad but thanks for helping ;)

[Southie]

I've been informed that I've got the engine with the sensor under the alternator, these have a cylinder head sensor, I'll have to take it to a garage for a look over I think.