Thread: Alternator brush replacement

Personally I think you are looking too hard and finding links that aren't there.

Any Disco before the Disco2 in 99 didn't have ECU control over the ignition. The ECU was fuel only and the ignition was just normal electronic ignition.

Do you just have the old style mixer for LPG? If so then it won't be connected to your ECU at all. Shutting off the injectors or the ECU is probably done with a relay.

I have a problem with mine (94 Disco) where it runs rough on petrol if I switch from LPG to petrol on the go. I have to switch the engine off and wait for the ECU to reset and then restart. The crap running coincides with a MAF fault so I assume the two are related.

I've read on here that the engine will have ignition trouble if you use a non standard alternator too but I've not had any experience with that.

If yours runs fine on LPG and rough on petrol then I would have thought it was a fuel or AFM thing. Have you checked fuel pressure?
Maybe also fuel temp sensor or one of the other sensors that petrol uses but not LPG.
Does it rev hard in the lower gears? Since you said it was slow to get up to speed I would guess it doesn't which would bring me back to fuel pressure.

Originally Posted by Landie93

Hi Guys


but I still get resistance when my foot is down flat, I get to about +/- 90km/h quite smoothly (not eagerly though) but then the coughs and splutters start and it i'd be lucky to get 110km/h

funny thing is when switching across to gas the Disco runs like a champ - I don't know what it's top end is yet, the last time I floored it I have run out of road and had to slack off after getting close to 140km/h - on one of those back roads in the sticks.

anyone out there with some answers??

don't know about running a disco on gas, however your disco should do 107MPH top speed, whatever that is in kph, on petrol [premium - these things don't like crap.]
suffice to say about 180 kph [someone will correct me]
it should accellerate from rest to top speed without any crap - mine does!
although i havn't had it to absolute top yet as there aren't roads to do it on [not that there were when i got 175]

having problems posting a reply - tried twice and got bombed out twice

fuel pressure is fine and sits at 2.8bar constant over a wait of 5 minutes

MAF setting was changed from a reading of 1.4 volts down to 0.7 volts to leen the mixture when I was getting raw fuel smells from the exhaust - I have not re-set this or taken it lower - will tweek this after changing out my fan/alternator belt this weekend

Your MAF should be between 1.0v and 1.5v at idle.

I'd set it back in that range. If it is any lower than 1.0v then it must be masking some other problem.

Originally Posted by Utemad

Personally I think you are looking too hard and finding links that aren't there.

Any Disco before the Disco2 in 99 didn't have ECU control over the ignition. The ECU was fuel only and the ignition was just normal electronic ignition.

Do you just have the old style mixer for LPG? If so then it won't be connected to your ECU at all. Shutting off the injectors or the ECU is probably done with a relay.

I have a problem with mine (94 Disco) where it runs rough on petrol if I switch from LPG to petrol on the go. I have to switch the engine off and wait for the ECU to reset and then restart. The crap running coincides with a MAF fault so I assume the two are related.

I've read on here that the engine will have ignition trouble if you use a non standard alternator too but I've not had any experience with that.

If yours runs fine on LPG and rough on petrol then I would have thought it was a fuel or AFM thing. Have you checked fuel pressure?
Maybe also fuel temp sensor or one of the other sensors that petrol uses but not LPG.
Does it rev hard in the lower gears? Since you said it was slow to get up to speed I would guess it doesn't which would bring me back to fuel pressure.

I replaced the standard alternator with a Nissan el cheapo one in my 94 Disco V8 with no probs at all. Quoted $1,650 for a genuine one from the dealer and replaced it for $165 inc fitting from an auto mechanic. Based purely on my experience I doubt the veracity of a non genuine alternator causing probs.

Regards


Martin

Hi again

Changed out the fan, alternater and Power steering belts this past weekend -now I have the problem of not hearing the engine when it's runninng, not a single squeek.... happy as Larry

I also changed the MAF back up a notch to 1.0volt at idle, all runs well and starts well but still does'nt want to let loose when under load (flooring it to allow it to drop down a gear or when needed) As said before the Landy respondes well when on gas but it just seems reluctant to respond on fuel - we took the Landy up the Mountain on Saturday and had to change it to gas to get it up there at a decent speed

The gas mixer is a relay type - the system is about 10 years old, my cylinder cirt was just renewed. other than the gas never seeming to last I am happy with the gas side of things.

This problems got me, it looks as if I am going to have to send it into the shop to put it on the computor, just don't have the tools to fiddle with the logics myself... Don't you just hate being out smarted by the smallest of things.

If it only does it on petrol, then I'd be looking at replacing the fuel filter as it sounds like a starvation problem.