Dave 2000
Not all Land Rovers are useless!
HDJ80 1994 Diesel Turbo Manual 182,000 miles (verified) full service history.
https://forum.ih8mud.com/80-series-tech/365673-my-lc-80-thread.html
I have had my 80 for about three weeks now and it is just perfect........until today! I was doing a three point turn on a road that was sloping and with a lot of camber, as I reversed and the back of the car dipped into the camber I noticed the revs dropped at idle from the normal rock steady 600 RPM down to about 400? So I pulled forward and as the car came to a stop on the other side of the road i.e. now pointing downwards the revs picked up to about 700 RPM.
Now the car has done this before but there were other factors involved making me dismiss it for example when turning and the power steering is loaded or the engine is cold ect but today the car/weather is warm.
Soooo now I am in diagnosis mode.
Car level idle perfect at 600
Car pointing uphill idle 400 and even lower depending on how steep the hill is.
Car pointing downhill and I have 700 rpm
Allow car to idle and let it roll downhill backwards and apply the brakes quite hard and the engine will cut out regardless of using foot brake or handbrake.
Drive along at a steady pace any speed you like put into neutral as the car starts to loose speed the revs rise very slightly and if I brake then the revs climb up even further.
I reversed down a very steep driveway and the engine was barely running at idle but rev it as much as you like and no problem. I switched it off and on the restart it struggled to catch, but it would rev real easy.
This is not a tacho fault i.e. the engine note is changing and of course the car is shuddering due to the low revs ect.
So I'm thinking fuel starvation, now my fuel gauge does not work but I know there is loads in the tank, the low fuel light is not on but I put another 20 litres in anyway and no change. TBH if you took the pick up pipe out of the tank the engine would run perfect for a minute or two until the fuel was depleted but this problem happens instantly the cars attitude in relation to being out of level. The fuel filter in the tank is clean, the fuel filter in the engine bay was changed 2000 miles ago and fuel injector cleaner was used when this was changed, the air filter is clean. If there was water in the filter which I have seen before in other cars this would not cause the engine to falter the instant the car was not level right?
I parked the car with the rear downhill and allowed it to idle at about 400 and went around the pipes around the pump and filter and no change whatsoever, I even crimped the fuel pipe between the filer and pump and it took about 30 or 40 seconds before the engine note changed as the pump was being starved, i released the crimp and the engine picked up straight away back to the 400 rpm's.
The car pulls like the proverbial train for testing purposes only I took it up to well, let's just say I MAY have exceeded the 120KPH or about 75MPH limit here but trust me the car was pulling hard and there are no issues when getting to this speed with the foot hard down.
And of all days today I had to pick up a load of paving slabs for a friend so the car was loaded up and the back was dipping down and sure enough the idle was just under the 600, pulled away and the car drove as though the weight was not there just perfect.
The car is still driving perfect this evening and of course if you are slowing down you do not notice the slight increase in revs unless your looking for it. It is not related to the brake lights loading the alternator, it is not related to the vacuum pump as it happens if I use the handbrake.
Is there a 'sump' inside the diesel pump that could have enough rubbish in to alter the idle when the car is tipped? The reason I ask is because the steeper the angle that the rear of the car is down the lower the revs and vice verse, and yet when level I can easily exceed national speed limits and it gets there without hanging around?
If you 'blip' the throttle at idle the engine responds straightaway, the throttle cable has enough slack in it to allow for the engine moving on it's mounts ect.
Tommorow I am going to connect a clean container of fuel direct to the pump and see if that makes any difference
I have been a mechanic for many years but mainly petrol with a fair bit of diesel stuff mixed in but I have not seen this before so any help would be appreciated and anything else I can try tommorow?
regards
Dave
https://forum.ih8mud.com/80-series-tech/365673-my-lc-80-thread.html
I have had my 80 for about three weeks now and it is just perfect........until today! I was doing a three point turn on a road that was sloping and with a lot of camber, as I reversed and the back of the car dipped into the camber I noticed the revs dropped at idle from the normal rock steady 600 RPM down to about 400? So I pulled forward and as the car came to a stop on the other side of the road i.e. now pointing downwards the revs picked up to about 700 RPM.
Now the car has done this before but there were other factors involved making me dismiss it for example when turning and the power steering is loaded or the engine is cold ect but today the car/weather is warm.
Soooo now I am in diagnosis mode.
Car level idle perfect at 600
Car pointing uphill idle 400 and even lower depending on how steep the hill is.
Car pointing downhill and I have 700 rpm
Allow car to idle and let it roll downhill backwards and apply the brakes quite hard and the engine will cut out regardless of using foot brake or handbrake.
Drive along at a steady pace any speed you like put into neutral as the car starts to loose speed the revs rise very slightly and if I brake then the revs climb up even further.
I reversed down a very steep driveway and the engine was barely running at idle but rev it as much as you like and no problem. I switched it off and on the restart it struggled to catch, but it would rev real easy.
This is not a tacho fault i.e. the engine note is changing and of course the car is shuddering due to the low revs ect.
So I'm thinking fuel starvation, now my fuel gauge does not work but I know there is loads in the tank, the low fuel light is not on but I put another 20 litres in anyway and no change. TBH if you took the pick up pipe out of the tank the engine would run perfect for a minute or two until the fuel was depleted but this problem happens instantly the cars attitude in relation to being out of level. The fuel filter in the tank is clean, the fuel filter in the engine bay was changed 2000 miles ago and fuel injector cleaner was used when this was changed, the air filter is clean. If there was water in the filter which I have seen before in other cars this would not cause the engine to falter the instant the car was not level right?
I parked the car with the rear downhill and allowed it to idle at about 400 and went around the pipes around the pump and filter and no change whatsoever, I even crimped the fuel pipe between the filer and pump and it took about 30 or 40 seconds before the engine note changed as the pump was being starved, i released the crimp and the engine picked up straight away back to the 400 rpm's.
The car pulls like the proverbial train for testing purposes only I took it up to well, let's just say I MAY have exceeded the 120KPH or about 75MPH limit here but trust me the car was pulling hard and there are no issues when getting to this speed with the foot hard down.
And of all days today I had to pick up a load of paving slabs for a friend so the car was loaded up and the back was dipping down and sure enough the idle was just under the 600, pulled away and the car drove as though the weight was not there just perfect.
The car is still driving perfect this evening and of course if you are slowing down you do not notice the slight increase in revs unless your looking for it. It is not related to the brake lights loading the alternator, it is not related to the vacuum pump as it happens if I use the handbrake.
Is there a 'sump' inside the diesel pump that could have enough rubbish in to alter the idle when the car is tipped? The reason I ask is because the steeper the angle that the rear of the car is down the lower the revs and vice verse, and yet when level I can easily exceed national speed limits and it gets there without hanging around?
If you 'blip' the throttle at idle the engine responds straightaway, the throttle cable has enough slack in it to allow for the engine moving on it's mounts ect.
Tommorow I am going to connect a clean container of fuel direct to the pump and see if that makes any difference
I have been a mechanic for many years but mainly petrol with a fair bit of diesel stuff mixed in but I have not seen this before so any help would be appreciated and anything else I can try tommorow?
regards
Dave
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