Thread: Getting seriously banana now....

It is possible the plugs have sooted up since the rebuild if the MAF was faulty. Have you had them out & inspected them?

Are they the correct heat range plugs for your car?

Has anyone stuck a probe up the zorst to check for overfuelling?
Have you a genuine Dizzy cap & rotor arm fitted?

After market ones seem to be notorious for "missing" problems.

plugs, leads, dizzy, coil, and the amp. In that order as previously mentioned.

Cats dont cause bad running unless they are clogged up and then that tends to cause loss of top end power that gets progressively worse.

from the list of also rans...

sticking valves
dirty injectors
sluggish fuel pump
clogged fuel filter (should get worse as time progresses)
bad earths
intermittent vacuum leak
dirty fuel
plugging air filter
bad electrical connection to an injector

of course some of those are more or less applicable depending on exactly how its doing what its not supposed to do.

Thanks for the post 4bee.

It is possible the plugs have sooted up since the rebuild if the MAF was faulty. Have you had them out & inspected them?

No I haven't. The motor was only rebuilt approx 4 months or so ago. Would the plugs have got the bad in an practically new motor that quick?

Are they the correct heat range plugs for your car?

Have no idea, how would I know by inspection? Though expect with DA being a LR specialist centre, I doubt they would have put the wrong ones in....

Has anyone stuck a probe up the zorst to check for overfuelling?

Really not sure on the exhaust probe thing, think diagnosis is just going by the code readers.

Have you a genuine Dizzy cap & rotor arm fitted?

Not a clue on the dizzy or rotor either, but again, I would have thought they should know?

Cheers,

..:: KIEREN ::..
2000 Disco II Auto V8
AussieAubs Disco Page

Originally Posted by Blknight.aus

Cats dont cause bad running unless they are clogged up and then that tends to cause loss of top end power that gets progressively worse.

Thanks for the input Dave.
Whilst the guys at the exhaust shop said there were no audible rattlings in the CAT, the "line of sight" through them wasn't clear and they did show signs of beginning of failure/breakdown. Once it pulls through that initial pulling away stuttering, the rest of the rev range/powerband seems fine at the mo.

I suppose plugs and leads are my next step, once I can find out if they were actually replaced at the rebuild.

Question though Dave, wouldn't alot of those problems you listed show up on the code reader? From what I've been told, there were no errors....

Cheers,

..:: KIEREN ::..
2000 Disco II Auto V8
AussieAubs Disco Page

You know, what you describe is a typical failure mode of the Throttle Position Sensor,(TPS).
They are like a volume control ie a variable resistor and they wear most just off idle.
Seems to be about the only thing not covered.
Regards Philip A

I had a problem like that once and it cost me a small fortune and a lot of frustration. It also taught me a BIG lesson.

The leads that we use today are carbon and designed to live for about 12 months!!

You may be lucky and see them live longer but generally 12 months is about when they start to play up.

Obviously it's hard not being there but I'd like to bet your leads are dodgy! It certainly sounds like they re the culprit!

Start it up at night time and see if you can see any sparks flying around the Distributor Cap or anywhere that they are near the engine. Either way, they are one of the cheapest places to start!

Oxy sensor's could be stuffed this was an issue with my old 98 falcon which had the same problem stuffed cat put new one on ran better but had the same issue put new oxy sensor in all fixed.

Hi Kieren
Look this is a really dumb question from an oiler-driver who knows jack about the V8's (except 10 years ago I had to do my valley cover 3 times ), but...

Are they fly by wire too? And if they are could it be some issue/confusion with the early part of the throttle input-response causing the ECM to mess up?

BTW - what time were you at workshop today? I was there about 10:30-ish...

Cheers
Mike