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        General >> Problems >> Idle, 2.9 Ultima Saloon
        
(Message started by: haitch on Jul 3^rd, 2008, 7:33pm)

Title: Idle, 2.9 Ultima Saloon
Post by haitch on Jul 3^rd, 2008, 7:33pm

Still have problems,Replaced the IACV with one from a fellow member,this was worse no idle at all just 0.
Cleaned and replaced my old one and disconnected the battery to reset defaults,This was much better even after a long run,Problem is while engine is under load all seems okay untill moving to P or N then idle surges up and down, 800 1000 .Also I seem to have bad fuel milage average 17.8 Motorway trip never over 70mph.
Also to crown it all i,ve lost my cruise control,push the buttons nothing happens,
Not having much luck,
Thanks >:(

Title: Re: Idle
Post by Simmo on Jul 3^rd, 2008, 9:07pm

Re the cruise control. Before doing anything else check that in 'playing' with the IACV you haven't disturbed the cable from the actual throttle mechanism. It has an element of slack in it and it can just get dislodged from the actuating arm.

Title: Re: Idle
Post by Jonnycab on Jul 4^th, 2008, 4:16am

17.8 mpg on a run :o.....what engine do you have ?....that's bad even for a cossie :(

Sounds like you really do need to get a scan before you go any further as something is deffinately wrong somewhere :(

If the mpg is really that high then it's obviously running way too rich......first thoughts are check the plugs. If they are black with soot then it will confirm the rich mixture. Is the air filter totally clogged up causing restricted air flow ?

Title: Re: Idle, 2.9 Ultima Saloon
Post by haitch on Jul 4^th, 2008, 9:11am

Thanks for the info.In my ignorance what is this scan and where will I get it done(Been overseas for 20yrs am out of touch) >:(

Title: Re: Idle, 2.9 Ultima Saloon
Post by Simmo on Jul 4^th, 2008, 4:43pm

First of all is the car a 2.9 24v Cosworth or is it a 2.9 12v ?. This is important because the 12v has a different diagnostic system. The 'scan' refers to connecting up a laptop computer to the diagnostic socket and reading off the data. There is some info HERE (http://www.fordscorpio.co.uk/obdfaq.htm) which may help. Also click on the links on the left of the page for more detail. You may be lucky and find a member who has the kit nearby who would run a scan for you. :)

Title: Re: Idle, 2.9 Ultima Saloon
Post by haitch on Jul 4^th, 2008, 6:22pm

Its a 2.9 12v,went to the Bluelink to confusing
Thanks

Title: Re: Idle, 2.9 Ultima Saloon
Post by Simmo on Jul 4^th, 2008, 9:47pm

As it is the 2.9 12v the fault codes can be read with a 'Star reader' which is detailed Here (http://www.fordscorpio.co.uk/star.htm).

Title: Re: Idle, 2.9 Ultima Saloon
Post by gozz on Jul 4^th, 2008, 11:23pm

haitch.
As jonnycab says,the quickest way to find the problem is a scan,if you have a decent diagnostic man nearby he should be able to get you a reading,although the 12v has the unusual combination of EEC IV electronic control unit with a 16 pin socket(of which only 4 pins are used) in the roof of the little storage box near your right knee (RHD).The most common failures on the 12v are the manifold actual pressur sensor (or it's vacuum supply) a black plastic unit mounted on the N/S inner wing panel,the exhaust oxygen sensors(2) mounted in both front pipes,or the throttle potentiometer at the front of the engine below the idle air bypass valve,on the end of the throttle butterfly shaft.Theworst problem of all is the engine wiring loom,though deteroration of that usually causes intermittent total engine failure due to loss of signal to the ECU.
Keep tryin GOZZ