Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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enen
ian jenkins

(3 posts)

Registered:
08/19/2013 05:45PM

Main British Car:
1998 Rover 4.0
Posted by: enen
Date: August 19, 2013 05:48PM

I have the older 14cux rover EFI system in another car but i am not familliar with this later version

It idles are 2500rpm when cold. RPM doesn't drop till its warmed up.
Is this normal for this EFI system??
Thank you


NCtim
Tim Shumbera
Western North Carolina
(239 posts)

Registered:
01/19/2012 04:35PM

Main British Car:
Re: 1998 Rover 4.0
Posted by: NCtim
Date: August 21, 2013 04:16PM

If you're asking about the GEMS EFI, that's sort of what mine does. Mine (4.0L) idles at 1000 rpm until warm and then drops to 700-800 rpm. I think 2500 is too high.

Tim


enen
ian jenkins

(3 posts)

Registered:
08/19/2013 05:45PM

Main British Car:
Re: 1998 Rover 4.0
Posted by: enen
Date: August 22, 2013 09:43AM

It has no distributor so i guess its a GEMS?
When started it idles at 2000, drops to 1000 then rises to 2600rpm in under 2 minutes.

It idles normally when warm
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ihscouts
Doug Gorshe
Traverse City MI
(2 posts)

Registered:
08/23/2013 10:57PM

Main British Car:
1997 Land Rover Discovery LR 4.0

Re: 1998 Rover 4.0
Posted by: ihscouts
Date: August 23, 2013 11:14PM

It's a GEMS (General Engine Management System) which was a joint venture between Lucas and Sagem.

The IAC (Idle Air Control) is a stepper motor (solenoid) that controls your idle speed. When the motor idles high it's usually a sign that the variables need to be reset by either a dealer or independent shop. Independent is the way to go, much less expensive.

Yours is idling way too high. Tim's is spot on.

Another problem with high idle is if the variables can't be reset it's usually corrosion (water) that has effected (corroded) the ECU (Engine Control Unit) contacts or traces.

There are a few excellent Land Rover web sites that have all this information and how to correct it.


enen
ian jenkins

(3 posts)

Registered:
08/19/2013 05:45PM

Main British Car:
Re: 1998 Rover 4.0
Posted by: enen
Date: September 05, 2013 08:42AM

Great, than you


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