C

Cowvahlo

Member
The scenario...

I can be driving along for a few minutes with plenty of power then all of a sudden power tails off, very smoothly, no sudden loss. I wait a few minutes and then fire her up again and she pulls off as normal with power only for the power to disappear again.

My thoughts are:

Lack of fuel getting to the injectors (I know very little about fuel systems!) caused by faulty pump or kink in the fuel lines(?)

Exhaust too small? Could a smaller diameter exhaust restrict emissions therefore choking the engine?

Other than those two things I'm pretty stumped, any ideas?
 
From the sound of it i suspect fuel - exhaust simply would cause it to overheat i suspect...and wouldn;t run well at all.

Lift pump would be my first thought - but please describe more of the scenario around this. Is this a new problem, or something on a new-to you car, or what? Details would be good here.

Alan
 
mrchurchill109 said:
From the sound of it i suspect fuel - exhaust simply would cause it to overheat i suspect...and wouldn;t run well at all.

Lift pump would be my first thought - but please describe more of the scenario around this. Is this a new problem, or something on a new-to you car, or what? Details would be good here.

Alan
Click to expand...
Its a Series III that had a 200Ti put in it a couple of years ago. When I first got it back I didn't use it too much but it seemed to run well for a a few weeks then problem started happening. Not much more to describe but I'll try...

Going up through the gears it pulls very well, turbo kicking in and plenty of power.
Driving along in fourth at around 40-50mph and nothing is the matter then the revs will start to die so I start going down through the gears. Dropping into third and I get a little more revs but then the same thing starts to happen. This repeats itself through 2nd and 1st until I need to pull over and the engine will cut out.
If I give it a few minutes of standing with the engine and ignition off then start it again, it starts as if there hasn't been any bother at all. I can then pull away but the above scenario happens again just quicker this time.
There's no jerking or bumping as if it was running out of fuel but more of a smooth reduction in revs and power.

It feels as though it is being starved of fuel somewhere along the line, this is backed up by it starting again after being left for a few minutes.
Could it be running on just the fuel that is in the fuel pump(?) so that I get a little run out of it until that fuel has been used and it will start again because the lift pump(?) will have pulled through enough fuel to get it going again?

Don't know if any of that makes sense!
 
Makes perfect sense. The lift pump doesn;t need to be completely dead just incapable of keeping up with the fuel needs at speed. When you;re going up thru the gears you;re revving the engine and the pump keeps up because it's hammering away down there. I just had a similar situation on a IIA 109 with a 2.25 petrol - ran fine at high RPMs but ran itself out of fuel at low RPMs.

First questions of course is have you changed the fuel filter, cleaned the sedimenter if equipped (likely not in a conversion) and check the air cleaner to make sure that it is clear and flowing freely - seen more than one instance where a fuel problem turned out to be an air restriction.
 
mrchurchill109 said:
Makes perfect sense. The lift pump doesn;t need to be completely dead just incapable of keeping up with the fuel needs at speed. When you;re going up thru the gears you;re revving the engine and the pump keeps up because it's hammering away down there. I just had a similar situation on a IIA 109 with a 2.25 petrol - ran fine at high RPMs but ran itself out of fuel at low RPMs.

First questions of course is have you changed the fuel filter, cleaned the sedimenter if equipped (likely not in a conversion) and check the air cleaner to make sure that it is clear and flowing freely - seen more than one instance where a fuel problem turned out to be an air restriction.
Click to expand...
Yes, and only the smallest split in diaphragm may mix oil in the fuel, or vice versa.
OP, have a look at this one as well

https://www.landyzone.co.uk/land-rover/please-help-random-power-loss.286011/#post-3554224
 
mrchurchill109 said:
Makes perfect sense. The lift pump doesn;t need to be completely dead just incapable of keeping up with the fuel needs at speed. When you;re going up thru the gears you;re revving the engine and the pump keeps up because it's hammering away down there. I just had a similar situation on a IIA 109 with a 2.25 petrol - ran fine at high RPMs but ran itself out of fuel at low RPMs.

First questions of course is have you changed the fuel filter, cleaned the sedimenter if equipped (likely not in a conversion) and check the air cleaner to make sure that it is clear and flowing freely - seen more than one instance where a fuel problem turned out to be an air restriction.
Click to expand...
Haven't done anything to it, the tank was low on fuel when it first started to happen so do you think it could have just dragged some crap through from the tank and could be case of changing the fuel filter?

When you say check the air cleaner, do you mean give the air filter a good bang out?
 
Cowvahlo said:
Haven't done anything to it, the tank was low on fuel when it first started to happen so do you think it could have just dragged some crap through from the tank and could be case of changing the fuel filter?

When you say check the air cleaner, do you mean give the air filter a good bang out?
Click to expand...
Try and never run low on fuel, it is the cause of many problems. A diesel tank should always be kept full as possible, unless you are actually driving!

And I would guess he means CHANGE the filter, and check all intake hose very carefully for restriction or collapse!
 
Turboman said:
Try and never run low on fuel, it is the cause of many problems. A diesel tank should always be kept full as possible, unless you are actually driving!

And I would guess he means CHANGE the filter, and check all intake hose very carefully for restriction or collapse!
Click to expand...
Yeah running on low was a school boy error, learnt that lesson! Will check everything over and replace fuel and air filter and see if it makes a difference.
 
1. Yes, crap from the tank could be the case, but could still be a dodgy pump...so filter change and retest.

2. Filter: No, don't just thump it. :) Check the passages in and out and make sure it's clear and there isn't some crap or a bit of wastepaper or whatever blocking the airflow.If your filter's that cruddy that it needs to be thumped clean it might be due for a change anyway... :)

Walk through the problem methodically - that's the best way to go.
 
Cowvahlo said:
That doesn't sound too bad. Problem I've now got is that I want to bin off work so I can go and play.
Click to expand...

Couple suggestions:
1. Don't buy a cheap pump - it's not worth it. Delphi is very goood, and nothing in a blue box (Britpart) should ever be installed on your Rover. Trust us on this one....

2. Don't call in sick for this - sneak out at lunch and fix it. :)

3. More seriously, when you go to swap the filter and the pump spend a little time tracing the pipes and such just to give yourself an idea of what goes where. A few minutes studying the engine and learning will be invaluable later as you need to tackle more complex issues.

3A: If you don't have the service manual for the truck and engine a Google of the Web and downloading a few PDFs is a very good thing to do.
 
mrchurchill109 said:
Couple suggestions:
1. Don't buy a cheap pump - it's not worth it. Delphi is very goood, and nothing in a blue box (Britpart) should ever be installed on your Rover. Trust us on this one....

2. Don't call in sick for this - sneak out at lunch and fix it. :)

3. More seriously, when you go to swap the filter and the pump spend a little time tracing the pipes and such just to give yourself an idea of what goes where. A few minutes studying the engine and learning will be invaluable later as you need to tackle more complex issues.

3A: If you don't have the service manual for the truck and engine a Google of the Web and downloading a few PDFs is a very good thing to do.
Click to expand...
1. When I first bought her I was warned in no uncertain terms about staying clear of Britpart!
2. I work for myself...temptation is a cruel mistress!:D
3. Good idea, will do that.
3A. I had downloaded and printed all of the manuals and parts manuals off for a Series III...me beloved darling ex wife threw them away when she was 'tidying' the house up!:mad:
 
Bit of an update, I gave her a little run out yesterday and in fourth gear I put my foot down, gently building the revs, turbo kicking in but it felt as though it was 'missing' slightly. Instead of a smooth power flow there was a slight dip in power which I could hear through the turbo. Instead of continually sucking it would stutter slightly.

Does this add anything to the problem, anything else I should think about other than the fuel and air filters?
 
Re: Stutter:

If it had an ignition i'd tell you to change the points... :) However, no - this makes me more suspicious of the fuel especially in light of the fact that the truck sat for an extended period of time.

With a Diesel all you need is fuel, air and compression and it goes round and round.

Alan
 
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