defenderdog
Active Member
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.
Interceptorxj
Well-Known Member
Fuel filter, oil in Ecu wiring loom are 2 of the usual suspects.
defenderdog
Active Member
I’ve changed the loom and cleaned the plug so I’ll try a fuel filter. Would this only cause problems at high revs?
Shimsteriom
Master Procrastinator
Fuel pump?
Bobdog
Well-Known Member
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.
sierrafery
Well-Known Member
1. What year and transmission?
2. EGR bypassed?
Little art
Active Member
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!
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!
defenderdog
Active Member
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.
defenderdog
Active Member
Cheers for your answer but I’ve Changed the fuel pump and still the same. Only seems to do it when you put the accelerator to the carpet to try and overtake or get it to kick down.
defenderdog
Active Member
Thank you for your answer but I’ve changed the pump. Still the same.
defenderdog
Active Member
Cheers mate. Me too.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!
defenderdog
Active Member
I will still try fuel filter but seems strange it’s when you floor it only.
Bobdog
Well-Known Member
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.
sierrafery
Well-Known Member
Seems like MAF cut-out, try with it unplugged and if it's OK we'll speak thenIt’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.
Feathers McGraw
Well-Known Member
Mine did that. Disconnected the MAF and it revved fine. New genuine MAF sorted it properly.
Michalis Karatzis
Active Member
Overboost? Wastegate modulator playing up?
defenderdog
Active Member
I’ll give it a go. I’m away at the minute but I’ll try it all Monday. Thanks
defenderdog
Active Member
I’ll give it a go thanks. I’m away at the moment but I’m back Monday I’ll give it a go and let you know
defenderdog
Active Member
I will try it on Monday. Thank you
Discodevon
Well-Known Member
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
