Thread: V8i Idling Issue

Eddie, Have you checked the quality of the fuel in the tank? If it is unreg, could it have sat around for ages?

JC

In most case you will just need to clean out the Throddle Body with carby clean, They seem to build up S#it and they idel very rough almost stalling at lights Etc. Just take off the hose between your Air flow meter and inlet, hold your throdle open with one hand and spray with the other, Put a rag under the pipe so that the Dirty fluid runs into it. You will be amazed at what comes out of there !

Then put it back togeather making sure you have no air leaks between you air box and inlet and start her up, will run rough for a few seconds and then shoudl run smooth once again !

It may be somthing else? but its worth a try, Somone may also be able to advise a better way to do the above ?

Cheers

Jeremy

Originally Posted by eddie_V8i

hi guys, im new to this forum, became a member a couple of hours ago, im looking to buy a December 1994 Landrover Discovery V8i, its cheap, unregistered, however it does come with log books.

There seems to be an idling issue.

it starts no problem, however, the idle is very erratic, and it has no "guts" - even at idle. Its almost as if it is running on 5-6 cylinders or something. I've done a compression test, all within 10kpa of eachother, there doesnt seem to be a vacuum leak, and the firing order is correct, and each spark plug and lead works fine. The engine isnt making any knocking noises, and when you do the (screwdriver against the rocker cover and against the ear trick) it all sounds normal. The oil isnt emulsified (its not grey/milky). The fuel pump does seem to work alright.

Would it be safe to say that perhaps the diaphram on the fuel reg has buggered out and thats why it is running erratically? My understanding is that the fuel pump delivers the pressure, so when i start it lets me, however because it cant buld up enough pressure, the injectors are starving or running lean.

Im new to Landrovers, and EFI's (my daily is a stock carby fed 1982 XE ESP)

Any possible advice will be greatly appreciated

Cheers
Eddie!~

well the rego only ran out a week before christmas, so its not too long for fuel to go 'stale' as such, if i take the afm off and spray 'carby cleaner' would that fix it? and if it does, could it wreck the O2 sensor?

Originally Posted by eddie_V8i

well the rego only ran out a week before christmas, so its not too long for fuel to go 'stale' as such, if i take the afm off and spray 'carby cleaner' would that fix it? and if it does, could it wreck the O2 sensor?

No O2 sensors in S1 Disco's, you can retrofit them though.

Can be MAF/Stepper motor/temp sensors, probably in that order !

Matt.

I had a very similar problem a few weeks ago on my 93 Disco V8.My idle started to play up on petrol and gas.Checked and changed everything and it turned out to be the stepper motor.I took it off which took about 5 min and cleaned it out with WD-40.(its all i had) There was a lot of dirt and gunk which came out of it but after that my idle was perfect.Better then ever

sorry but what is a stepper motor and where would i find it?

its ok i found a pic of a stepper motor when i googled it:


but im wondering, can this cause a rough idle and can it cause the engine to not want to even rev up? (ie past 1500-2000 rpm?)

Trying doing a search in the forum, this topic has been covered alot.

Matt.