Accelerator wont work in gear.

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Well they gave it back to me today saying they couldn't fix it. But on a happy note they didn't charge me.

I asked them to up the idle revs so it's on +4 at the moment (about 200rpm extra) now doing this has changed the problem a little.

The problem only happens now in reverse when the engine is hot and I have load on the engine ie full beam or air con on.

Put it in reverse and the revs drop to about 500rpm and stick, and the accelerator does nothing.
 
image.jpg
 
I still say its a sticky injection pump I'm not sure if more load is used in reverse , maybe one of the egg heads can answer that one.

so upping the revs has improved things in forward gears? Does it pull away and drive?
or does it hesitate and pull away more info your very vague at the moment.
 
Datatek said:
I think I'd try an EDC swap to see if that affects things, otherwise it sounds like the FIP. Wammers may shed more light on it.
Click to expand...

The injection pump doesn't know the car is in gear other than the info it gets from the ECU to increase fuel to maintain idle RPM under load. Bit of an enigma this one. Unless the ECU is not coming out of idle control when the throttle pot moves, for some reason the idle switch is not being disengaged.
 
Grit Valve said:
I still say its a sticky injection pump I'm not sure if more load is used in reverse , maybe one of the egg heads can answer that one.

so upping the revs has improved things in forward gears? Does it pull away and drive?
or does it hesitate and pull away more info your very vague at the moment.
Click to expand...

:hysterically_laughi
 
wammers said:
The injection pump doesn't know the car is in gear other than the info it gets from the ECU to increase fuel to maintain idle RPM under load. Bit of an enigma this one. Unless the ECU is not coming out of idle control when the throttle pot moves, for some reason the idle switch is not being disengaged.
Click to expand...
The engine will rev with very little fuel out of gear, so I wonder if the FIP is sticking and not opening fully? Or as I said & you said it's a problem with the EDC.
 
Datatek said:
The engine will rev with very little fuel out of gear, so I wonder if the FIP is sticking and not opening fully? Or as I said & you said it's a problem with the EDC.
Click to expand...

That could only be down to the quantity servo. If 50% throttle is being signalled by pot, servo should move to 50% position. If that RPM is not reached as signalled by CPS because of load, ECU will increase fuel until it is reached then stabilise. My impression is when in gear there was no attempt by the engine to increase RPM as if the throttle pot was disconnected. If that is the case and the servo is not reacting to inputs from the ECU there surely must be a fault logged. I have been saying get it on some proper diagnostics for a long time it has fallen on deaf ears.
 
wammers said:
That could only be down to the quantity servo. If 50% throttle is being signalled by pot, servo should move to 50% position. If that RPM is not reached as signalled by CPS because of load, ECU will increase fuel until it is reached then stabilise. My impression is when in gear there was no attempt by the engine to increase RPM as if the throttle pot was disconnected. If that is the case and the servo is not reacting to inputs from the ECU there surely must be a fault logged. I have been saying get it on some proper diagnostics for a long time it has fallen on deaf ears.
Click to expand...
Yep, diagnostics and live data is the only way forward.
 
It's not fallen of deaf ears. I took it to what I thought was a very well known Landrover garage, the diagnostic thing they had (looked like a fisher price iPad with big blue handles) didn't show any problems. The throttle pot voltage increased when the throttle was moved, but no reaction from the engine at all, not even a flinch.

Ok so back to the description of the problem I will try to be less vague.
It drives fine and pulls well, gears change beautifully. But when the engine is hot and you put it in reverse the revs drop to about 500rpm and don't recover. If I take my foot off the brake it will roll backwards as well as it can at 500rpm, but the accelerator will do nothing, as if the wire has been cut. Knock it out of reverse into any other gear (now) and it works perfectly. If I rev the engine above 900rpm and shift to reverse it will work fine, until you take your foot off the accelerator and put it back on.

Since the idle revs have been upped the revs it falls and sticks at when it has the problem have stayed the same.
 
gib6933 said:
It's not fallen of deaf ears. I took it to what I thought was a very well known Landrover garage, the diagnostic thing they had (looked like a fisher price iPad with big blue handles) didn't show any problems. The throttle pot voltage increased when the throttle was moved, but no reaction from the engine at all, not even a flinch.

Ok so back to the description of the problem I will try to be less vague.
It drives fine and pulls well, gears change beautifully. But when the engine is hot and you put it in reverse the revs drop to about 500rpm and don't recover. If I take my foot off the brake it will roll backwards as well as it can at 500rpm, but the accelerator will do nothing, as if the wire has been cut. Knock it out of reverse into any other gear (now) and it works perfectly. If I rev the engine above 900rpm and shift to reverse it will work fine, until you take your foot off the accelerator and put it back on.

Since the idle revs have been upped the revs it falls and sticks at when it has the problem have stayed the same.
Click to expand...

Get some dedicated diagnostics on it, there HAS to be something showing up somewhere on either ECM or gearbox ECU. If when in reverse the throttle pot is showing changes but the engine is not reacting there has to be something blocking the signal from the ECM to the injection pump.
 
gib6933 said:
It's not fallen of deaf ears. I took it to what I thought was a very well known Landrover garage, the diagnostic thing they had (looked like a fisher price iPad with big blue handles) didn't show any problems. The throttle pot voltage increased when the throttle was moved, but no reaction from the engine at all, not even a flinch.

Ok so back to the description of the problem I will try to be less vague.
It drives fine and pulls well, gears change beautifully. But when the engine is hot and you put it in reverse the revs drop to about 500rpm and don't recover. If I take my foot off the brake it will roll backwards as well as it can at 500rpm, but the accelerator will do nothing, as if the wire has been cut. Knock it out of reverse into any other gear (now) and it works perfectly. If I rev the engine above 900rpm and shift to reverse it will work fine, until you take your foot off the accelerator and put it back on.

Since the idle revs have been upped the revs it falls and sticks at when it has the problem have stayed the same.
Click to expand...
The diagnostic unit sounds like a Hawkey Pro.
So the problem is only in reverse? That changes things more then a little,
as well as diagnostics, I'd be stripping out the centre console and looking for damaged wiring.
 
What tells the engine to up the revs when the ancillaries come on, air-con and alternator?

But if it was just that it wouldn't stop the accelerator from working would it?
 
gib6933 said:
What tells the engine to up the revs when the ancillaries come on, air-con and alternator?

But if it was just that it wouldn't stop the accelerator from working would it?
Click to expand...

An idle switch is engaged when throttle pedal is fully back. Engine speed is measured by CPS. If a load is applied revs drop and ECU increases fuel to return engine speed to idle preset (750 +- 50) RPM. If diag could adjust idle RPM up 200 RPM that appears to be working, at least out of gear. Does the car go to fast idle from cold 1100 RPM or thereabouts then drop back as engine warms? I still think something should be showing up on a proper diag kit. Or it was showing on the one you used and not noticed.
 
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