Thread: No speed increase at full throtle

td5 or v8?

auto or manual?

Sorry,

TD5 auto

i know this isnt helpful for you but for everyone else: i think i found the problem.

It's because it's a diesel?

It was never this bad. I was able to overtake less than 12 months ago. Now I don't bother trying.

EGR could be stuck open perhaps?

run a stall test on it, at least you'll know that it's engine management or autobox related

Originally Posted by AUTOMATIC GEARBOX - ZF4HP22 - 24; ADJUSTMENTS 44-21

Stall test

Testing
1. Chock the wheels and fully apply the
handbrake.
2. Start the engine and run it until it reaches
normal operating temperature.
3. Apply the footbrake and select 'D'.
4. Fully depress the accelerator pedal and note
the tachometer reading. The figures should be
as given below.
l V8: 2200 to 2400 rev/min
l Diesel: 2600 to 2800 rev/min
5. A reading below 1300 rev/min indicates a
torque converter fault, ie stator free-wheel.
6. A reading between 1300 and 2200 rev/min (V8)
or between 1300 and 2600 rev/min (Diesel)
indicates reduced engine power.
7. A reading above 2400 rev/min (V8) or above
2800 rev/min (Diesel) indicates clutch slip.

Do not carry out stall test for
longer than 10 seconds, and DO NOT repeat
until 30 minutes have elapsed.

NOTE: The figures quoted above were
measured at sea level with an ambient
temperature of 20 °C (68 °F). At higher altitudes
or higher ambient temperatures, these figures
will be reduced.

I estimate the reading to be between 2800-2900.

I did have a new aftermarket fuel pump installed a while ago. Could that be the cause?