R

Rich1968

New Member

• Oct 8, 2014

• #1

Hi chaps

Don't know if anyone can help, my 4.0 Defender was runnin sweet as a nut before I messed with it! I changed the valley gasket and now idles like a dog, with a slight splutter when touching the throttle.
Have changed the stepper and pretty sure there are no air leaks.

At least it looks nice now with painted rockers and inlet.

It's a Gems EFI V8

Any ideas?

Cheers

Rich

 

classic kev

Well-Known Member

• Oct 9, 2014

• #2

I know very little about Gems but would suggest look at air flow meter and throttle potentiometer (if it has one?). The only other thought I have is ignition timing/advance. I'm sure somebody more familiar with Gems will be along to give a more reasoned bit of advice.

 

cooltide

sheep fancier

• Oct 9, 2014

• #3

Not up on gems either but

It could have been drawing unmetered air before the work
It could be drawing unmetered air after the work
You could have plugged something in the wrong place injector / sensor

Have you set base idle?

 

dove

Active Member

• Oct 10, 2014

• #4

Inlet gasket leaking?

 

zen

Well-Known Member

Events Planner

• Oct 11, 2014

• #5

i go for above..if it was sweet before..too weak now..

you could check plug colour and hopefully this would point at dodgy cylinder =which inlet gasket part you fecked..
if all plugs same then prehaps would be looking alse where..(as unlikely you got a leak on all 8) as stated previously ie maf not plugged in etc..

 

R

Rich1968

New Member

• Oct 29, 2014

• #6

You are right chaps!

When you have the gear, easy to diagnose. Took it to my local old school 4x4 centre. Vacuum gauge showed it was low ie had a leak. Stethascope nearly blew the blokes ears of when he found the leak.

Inlet manifold.

So is my incompetence or a crap gasket? Will have another go with genuine bits.

Rich

 

R

Rich1968

New Member

• Nov 9, 2014

• #7

Turned out to be a duff gasket - stripped it down to find part of the valley gasket around inlet 5 not to be there. Looks like rubber was there initially but no metal in between.

Replaced with genuine bits and all good.

Rich