2.5td gutless at 50mph where to look

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Splashman237

Member
Posts
63
Location
Nairn Scotland
2.5 TD (19j engine) full rebuilt and running fine and smooth at under 50 mph, then it runs out of power and feels like it not getting enough fuel . splutters and slows down . Once stopped seems to start ok and run at Idle but begins to loos power on driving / accelerating. Retfurbed injectors, new fuel injector pump, new lift pump , feed lines all checked, small amount of air in injector pump, no other simptoms . Where should I look next - turbo ?:confused:
 
Turbo not noticeable up to 50 enemy's to be spinning and no 'play' felt on bearings , exhaust gasses drive turbo, might the exhaust dump valve be not working ? How do you test it ?
 
You need to make sure there is fuel compensation when the turbo kicks in , check the vac hoses, and you need to check boost pressure, it sounds like the engine isn't set up right.
 
You need to make sure there is fuel compensation when the turbo kicks in , check the vac hoses, and you need to check boost pressure, it sounds like the engine isn't set up right.

Out of interest, what would you do if there was a fault with either the vac hose or boost pressure?
 
Turbo vacuum leak would show as reduced power through all gears not just at over 50 mph. Lack of fuel when the turbo is up to speed does not cause spluttering, it simply runs out of grunt.

Spluttering sounds like fuel starvation or air in the fuel system to me, so first port of call would be lift pump.
 
Once power has gone at 50 ish there after power lost continues through any gear and reduces power down to 35-40mph until I stop. There is some air at the injector pump on bleeding at the screw but only a couple of bubbles. It's got a new lift pump I'll try introducing a flea plastic pipe to see if I can track down any air coming in.
 
Still not resolved, definitely air getting into injector pump. So replacing pipe work one at a time to eliminate the problem. Don't think it was a Delphi lift pump, suspect it was a cheapie. Can always put the original back in it seemed to work ok, only swapped as part of trying to find the root of problem.
 
So fitted a Turbo boost gauge. As the landy gets to 50mph the Turbo boost pressure climbs to 0.5 bar and at 50 it then drops off the about 0.25 bar not sur wife that's the result or the cause it seems to happen at same time. I've been round all the joints in both intake and return line and wrapped them all with amalgamating tape and I'm still getting air into the injector pump. . Could that be coming via a bust injector pump diaphragm ? Or is it the turbo that's the root of this issue ?
 
try removing boost pipe to waste gate diaphragm ,block pipe and try that
Tried removing boost pipe to diaphragm , made no difference, still faltering at 50 mph and then lots of air in the injector pump. Interestingly if I maintain 35-40 mph over the safe route no faltering and no air in injector pump . Hmmm any ideas what it might be ?
 
Tried removing boost pipe to diaphragm , made no difference, still faltering at 50 mph and then lots of air in the injector pump. Interestingly if I maintain 35-40 mph over the safe route no faltering and no air in injector pump . Hmmm any ideas what it might be ?

Did you seal up the pipe, like James said?
 
Did you seal up the pipe, like James said?
Yep sealed the pipe(s) up . Boost pressure went up a little to maybe .55 Bar then engine faltered and lost power, for maybe 10 secs then picked up and repeated till eventually cut out with plenty air in injector pump. Strange that if I drive slowly 35-40 mph no air at injector pump .
 
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