Trying to find a miss in 96 Discovery 3.9

Had a similar problem with my 2001 Disco.
Turned out to be a coil pack. "they never go wrong" yeah right. Only one in Oz and had to ship it from Sydney to Kalgoorlie...

Check all your plugs - you'll get a black carbonisation on just 4 of them if it's a coil pack, mine was missing on 2 with the other 2 just showing some black staining by the time we found the problem. Platinum tipped buggers too, $$$. To be sure, check the numbers against the firing diagram in your manual - it tells you which plugs go with which coil pack.

Coil pack was about $400 I think, plus pulling apart and re-assembly. Then the new pack stressed the old leads which probably hadn't felt that much juice for a while, and they neede replacing too.....

Yes, to new plugs. Coil pack??? Did not relise it had one as it has a Electronic dizzy and coil. Have not got a manual, will have to purchase the AULRO manual CD.

Quote:

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Originally Posted by SpeedWayRover

Coil pack??? Did not relise it had one as it has a Electronic dizzy and coil.

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Don't worry, you don't have a coil pack:cool: .
Later cars did away with the distributor & ran coil packs.

Ok, updates, After getting all injectors checked and still having the problem I decided to play around with the adjustment in the airflow metre. It did not seem to make any difference so I ended up putting it back to where it started. I then went for a 30 minute trip and beleive it or not the problem has nearly ceased. now this brings me to the conclusion, that just maybe the airflow sensor was all gooed up or something and with the moving I did with the adjustment, it just might have helped it get working again? Is the airflow sensor able to be pulled apart and cleaned? Could a dodgy airflow metre cause the problems I have been having? PLEASE HELP!!! I Am Desperate!!!:o

It can be, carefully.
Remove the screws on the inlet, I think, & gently seperate the 2.
You will see the bypass canal in which the hot wires are situated. I cleaned mine with Metho, although there was no obvious crap on them.

Wasn't aware there was an adjustment, & I don't think I'd go there anyway.

Hmm, wont she be in the passenger's seat ?

oK, The miss is back yet again and I have run out of time as I am going down to Victoria this weekend, sooooo, I need to find a good mechanic in Western Sydney that will be able to find and fix the problem while I am down Vic, before I come back to Syd in a week or so to drive the Lovely "fixed" Discovery back to Vic. Any help would be very much appreciated, thanks.

I doubt that the problem is the airflow meter. If it goes bad the ECU will revert to "limp home" mode and you will get increased fuel consumption but it should run well.
I would still look at plugs, leads, injectors, injector leads.
What about the temp sensor. If you have a multimeter check that the resistance across the two terminals is 300-400 OHMS while the engine is at operating temp.
Regard s Philip A..

Good point. I looked at mine this morning before I read this reply & suspect the spade terminals were loose-ish & dirty.
Not surprising really, the way it's tucked in behind the alternator & air stream.:(

Anyway have cleaned them up & reset them.

Are those readings for the Lucas 3TT ECT or doesn't it matter?


Not sure yet, but It appears as though it may (?) be running a little better. I have not had it up to normal optng. temp yet & I will then also check the resistance.

'Placebo Effect' in action maybe? Fingers crossed.:eek:

Have been for a run to the big smoke today & worked the engine hard-ish coming home.

Checked the resistance across the ECT with the engine quite hot & that read 0 ohms. ie. Open circuited.

Remove the leads & no difference in the running of the engine. ????


Odd thing is now I can adjust the Base Idle speed over a range where-as before I couldn't much without it going ga-ga.

Temp. gauge seems to be now reading higher than normal for this time of the year. ie. midway.

So, what came first? The chicken or the egg? While in town, the engine seemed more responsive.


Now, to check the ECT when it's cold.

Stuffed, maybe? Thoughts please.:confused: