Can some one help.
Took my car to garage about a month ago to have some water hoses done (the fidley ones needing manifold removed to fit). The car had previously started perfectly and idled at 800-900rpm. when i picked it up the car started as though it was missing or as though it was struggling to idle correctly. It would then starighten out fine after 4 seconds and idle at 11oorpm. Some one said it may be the ISCV but i removed this it seemed clean ish and moved freely.It also made no difference if i unplugged the ISCV. Last night i started the car and the revs went through the roof all the way round to 6000rpm. To get me home i unplugged the iscv and this brought the revs down to 2500rpm. It was like cruise control. Rang Ford dealer and they said the car is too old school and their diagnostic kit would not be compatible with this car. Realy stuck and sick of not having people who know what they are talking about. Scarborough has no decent expertise to fall back on. Tried to get to the TPS today but it is a bit of a mission and no body seems to have replacement items in stock. Can anybody help please.

 

Did you check if the water temp sensor under the plenum is connected and in good working order? Does is idle that high also when in normal operating temp or only from cold start?

 

If you removed the intake, my bet would be a leak somewhere around there.

 

I'm struggling to think what pipe would need the manifold removing to fit them, they are all easy to do without removing, the inlet manifold I assume you mean, this isn't water heated, and the pipes are easy to get to from underneath, maybe the garage assumed the inlet man would be heated, most are nowadays.
This would also account for the high rpm, it is almost certainly an air leak, any air that gets in the inlet manifold without going the correct route through the iscv will cause it to idle/run faster, so it's just a case of finding where the air is getting in.
Go over the car and recheck thier work, ie that all hoses/pipes esp are fitted securely.
There is Paul Linfoot at pickering that is a RS cossie breakers, but he also works on other peoples as well, and knows what he is doing, he won't be available unfortunately for a few weeks, due to a family bereavement, but is a good port of call once settled down, he used to be in scarby as well!!
tabetha

 

I posted on your other thread relating to same issue, however this thread tells us that you have had the inlet manifold removed I am guessing it was your Modine cooler hoses you had replaced, these are below the manifold even so you don't have to remove to get to them.

It may be you have an air leak where the manifold has been removed this would cause the rough running thus a high idle.

You don't need to connect diag stuff this just shows easily what is wrong, good fault finding and you can work the problem out. In any case they do have diagnostics but not what they know it as I.E (OBD) it's a simple flash system needing nothing more than a 12V LED or LED and resistor and is quite effective, in any case that won't be a sensor causing this problem.

Martin

 

Paul Linfoot will be able to help as noted - the family bereavment is a very sad situation but I am sure that he will be around again before too long. He posts here as NORTH YORKS RS SPARES

 

Thanks for your help to everyone who has replied.
I went back and sprayed brake cleaner all over the hoses and all around the manifold and it didnt make a difference but surely if there is an air leak then the revs would have risen. I tugged all related hoses and wiggled the temp sensor and all seems fine. Could this be a TPS stuck in full throttle possition? why does the revs drop from 6000 to 2500 when I dissconect the ISCV?

 

The drop shows the iscv is working, but it should also drop to it's natural base idle, unless the muppets have fiddled with this also, it's a brass screw on the underside of the throttle body, this is the air bypass, that allows air into the engine around the closed throttle flap, check the throttle is actually closing fully, leave the iscv disconnected for now.
The thing also is something is telling the iscv to open that much, 6K is a hell of a lot, I can't see it coming to this much with even a -100C reading!!
tabetha

 

As I say in your other thread check the ISCV has not got shorted to earth, this is the only thing I can see causing it to open that much.

The ISCV and the throttle are the only things that can raise engine speed, all the TPS does is tell the ECU the throttle angle it can't actually raise the idle.

Martin

 

Took car to ford today and it turns out it was a plastic pipe clip attactached to the map sensor pipe jamming the throttle slightly open. What a f**king idiot i am. And the other rough idling issue on start up was owing to the pipe going into the map sensor not being air tight. Car is how it was before the whole shinanigans started. Thanks to you all for being so helpfull. You can imagine how embarrased I am!

 

Yeah but happy m8,nice its fixed for the weekend.

 

Just bout wasted spark kit from motor sport developments. Is it as good as they say and what benefit will it actual bring to my car?

 

Happens pal - best thing is that you got it sorted!!!

I had an electrical gremiln last week - loadsa good advice and when I went out in the car again it had sorted itself out... good old cossies

 

You'll love it m8,i wouldn't have a cossie without it.