Tdi Throttle Problem

[hampstead]

Car is a 1998 TDI 110.

 

On 3 separate occasions recently when putting my foot down hard to overtake from a steady speed, the throttle has become unresponsive and the engine died back to a fast idle. This is accompanied by an orange warning lamp flashing on the dash, which I think is the glow-plug lamp.

 

Turning the engine off and re-starting clears the fault - car otherwise runs fine.

 

Can anyone suggest some areas I could investigate (including where physically on the car) before sending it off for some dealer diagnostics?

 

Thanks.

[Ivor_E_Tower]

Usual places to start - check all your brake lights are working; check MAF sensor by disconnecting it and see if that improves matters (under the bonnet and just downstream of the air filter).

[hampstead]

Thanks for the reply. Been away from a PC for a while so hadn't seen it, but the MAF sensor is fine (I replaced it about 6 months ago) and all the brake lights work OK (curious to know why I needed to check that!).

 

Any other ideas from anyone?

 

Thanks.

[Masked Marauder]

Check the vacuum pipes to the turbo and from the vacuum servos to the air intake on the right top of the engine for perishing and splits.

[Guest neil_wiles]

Had the same problem on my 99 Tdi and it turned out to be an intermittent track on the accelerator position sensor, changed it and cured the fault entirely.