TD5 Surging under heavy accelleration

2000 Discovery TD5 auto surging when you floor it from low revs. Have replaced fuel filter and used injector cleaners but no better. Drive steady it's fine up till 2500RPM then flat with no torque beyond. Any ideas welcome.

Tyrone Disco said:

2000 Discovery TD5 auto surging when you floor it from low revs. Have replaced fuel filter and used injector cleaners but no better. Drive steady it's fine up till 2500RPM then flat with no torque beyond. Any ideas welcome.

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sounds like a sensor fault to me. Are you using any oil or coolant?

no. just checked inlet pipe to turbo and small pipes to wastegate actuator and all clear, also arm to wastegate moving freely but still. I'm assuming this is normal. no lights on dash at all so debating spending the money to put on diagnostics ?

had the same problem last week. Turned out to be the air pressure senser.

remington said:

had the same problem last week. Turned out to be the air pressure senser.

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I had it with mine and it turned out to be a faulty coolant temp sensor. It was correctly showing the temp though.

Diagnostics it is, before I replace half the car. Thanks for the feedback.

Tyrone Disco said:

Diagnostics it is, before I replace half the car. Thanks for the feedback.

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Whereabouts are you located?

Diagnostics are the way to go although they may not show up the fault. Some sensors will still show they are working even if thy are faulty.

Tyrone Disco said:

2000 Discovery TD5 auto surging when you floor it from low revs. Have replaced fuel filter and used injector cleaners but no better. Drive steady it's fine up till 2500RPM then flat with no torque beyond. Any ideas welcome.

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Its overboosting,simple as that.Most likely the wastegate sticking on the turbo,or the modulator solenoid has failed or one of the little pressure pipes has blown off.
The engine ecu cuts fuelling when it see's more than about 230Kpa,so the power drops,and so does the boost.Then it restores fuel till it overboosts etc,etc.

To answer both questions above. Omagh N.Ireland, and the small pipes are fine, I've had them all off and clean rge aire intake pipe and the 90degree block on tiop of the pipe from the engine breather.
How do you check if it's the wastegate sticking or the modulator solenoid ?