Disco 2 Disco2 spluttering in full throttle

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defenderdog

defenderdog

Active Member
Posts
328
Location
Bedfordshire
Hi all. I noticed today when I buried the throttle on my Discovery 2 that it jerks about and stutters. Any ideas what this could be.
 
defenderdog said:
I’ve changed the loom and cleaned the plug so I’ll try a fuel filter. Would this only cause problems at high revs?
Click to expand...
Mine was doing similar, drove fine around town up to around 30mph but started juddering at anything above it and struggled to go any faster. Turned out to be fuel pump. Turn ignition to position 2 and listen for it priming. Mine was dead.
 
Been there done that I hope for u,
Checked fuel filter, wasn’t that
Checked fuel pump was that
Checked voltage of fuel pump, wasn’t there.
We made a bypass from 12v accessory point in the back of the car, should replace it someday :)

Hope u find it!
 
sierrafery said:
1. What year and transmission?
2. EGR bypassed?
Click to expand...
It’s an auto on a 2003. This only happens if if bury the throttle to the floor. Like to try and get it to kick down. It will rev right through to say 4-5 k no problems but bury the accelerator and it jerks all over the place. :eek:
 
Bobdog said:
Mine was doing similar, drove fine around town up to around 30mph but started juddering at anything above it and struggled to go any faster. Turned out to be fuel pump. Turn ignition to position 2 and listen for it priming. Mine was dead.
Click to expand...
Thank you for your answer but I’ve changed the pump. Still the same. :mad:
 
Little art said:
Been there done that I hope for u,
Checked fuel filter, wasn’t that
Checked fuel pump was that
Checked voltage of fuel pump, wasn’t there.
We made a bypass from 12v accessory point in the back of the car, should replace it someday :)

Hope u find it!
Click to expand...
Cheers mate. Me too. :(
 
defenderdog said:
I will still try fuel filter but seems strange it’s when you floor it only.
Click to expand...
Well it can only be fuel or air related, have you replaced the MAF at all? Try running with it unplugged. If it improves, that's the problem. Other than that, maybe fuel pressure regulator?
It could be fuel filter though, if it's clogged, it will choke fuel supply at higher revs, very cheap and well worth trying.
 
defenderdog said:
It’s an auto on a 2003. This only happens if if bury the throttle to the floor. Like to try and get it to kick down. It will rev right through to say 4-5 k no problems but bury the accelerator and it jerks all over the place. :eek:
Click to expand...
Seems like MAF cut-out, try with it unplugged and if it's OK we'll speak then
 
Bobdog said:
Well it can only be fuel or air related, have you replaced the MAF at all? Try running with it unplugged. If it improves, that's the problem. Other than that, maybe fuel pressure regulator?
It could be fuel filter though, if it's clogged, it will choke fuel supply at higher revs, very cheap and well worth trying.
Click to expand...
I’ll give it a go. I’m away at the minute but I’ll try it all Monday. Thanks
 
Wastegate actuator or modulator on a d2... bit as mentioned maf sensor it’s most likely that, if you’re planning to keep her use genuine in a LR box, not vdo
 
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