Esprit S4 Idling speed

[wipper]

I've recently bought a 1995 Esprit S4 and have had a few problems so far, including the head gasket and lamba sensor failing (to name a few!!). My latest is the car idling speed. It usually idles at between 1500 and 2000 rpm (only occasionally at 1000 or so). As I'm new to the car I need help!! Any advise greatly appreciated!

[az88turbo]

Hi,

It should idle higher when cold or the A/C is on and around 950-1000 when fully warmed up. If it is idling too high when fully warmed up; check that the throttle jacking unit is working correclty and not sticking. The unit is located at the place on the inlet manifold (where the throttle cable goes in). When the car is cold it should push the arm outwards, letting it fully down when your car gets to around 70c. If this appears to be working correctly; check the connetions to your IAC (Idle Air Control) motor located to the left (front of the car) on the inlet manifold.

Hope this helps,

Mark - 88 Turbo

[wipper]

Cheers Mark. I'll give it a try tomorrow at first light!

[Skerd]

If you turn the car off and turn it right back on again, is the idle normal?

[wipper]

Sometimes it corrects itself, but not always. I've tried the other things but everything mechanical seems ok I think, so maybe it's the ECU or something. The car seems to have a mind of its own and have good and bad days!! (I reckon it's female!?!)

[Skerd]

I had this same problem and it took forever to diagnose. Turned out it was the fuel pressure valve. It simultaneously fixed the car taking about four tries to start when cold. Does yours start the first try when cold?

[wipper]

Yep the car starts first time no problem. Been out in it today and has been OK for the most part, but seems to play up randomly.

[PatHeald]

I experienced similar problems on my carbed '87 HC Turbo.

I pulled the wires off the throttle jack solenoid and have never looked back...

Pat.

[wipper]

The cars still really new to me so where's the throttle jack solenoid??

[andecorp]

throttle position switch? Very common for them to do this. I had one I had to replace. Hook up FreeScan and you will know instantly. Then it's a two minute job to replace it.

[jconsta6]

Hi,

I had the excat same problem on my S4.

I removed the EBPV and then plugged the vaccum from it. I get confused now, but I'm sure you need to also plug the vaccum to the throttle jacking as well.

Yes, that was it - there is a red and black vaccum pipe which goes to the throttle jacking capsule.... I think...if I remember correctly.


I did mine about 2 years ago, and I remember it making sense at the time.... but I don;t have the car anymore.

Mine always started first time, and the problem went away completely after removing the EPBV and throttle jacking vaccum.

Cheers,

JC