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Author: Subject: Tintop problem
Humbug

posted on 27/2/07 at 11:37 AM Reply With Quote
Tintop problem

1999 VW Passat estate 1.8 petrol (non-turbo)

Symptoms: feels like driving with the handbrake slightly on, i.e. for any given speed, have to accelerate more and/or be in a lower gear.

Latest: going along the motorway with a steady throttle pedal, it will suddenly slow down a bit (say 5mph) for 5-20 seconds, then speed back up again.

Any ideas for things I could check before paying someone to clock up hours of investigation time?

Cheeyaz

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macnab

posted on 27/2/07 at 11:42 AM Reply With Quote
have you checked if any of the wheels are getting hot. A sure sign that a brake is binding.



[Edited on 27/2/07 by macnab]






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locoboy

posted on 27/2/07 at 12:12 PM Reply With Quote
Fuel pressure regulator/pump, possibly not managing to maintain pressure or regulate pressure consistently.





ATB
Locoboy

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westf27

posted on 27/2/07 at 12:43 PM Reply With Quote
blocked exhaust?





Roof and doors pah ! who needs 'em.......well not March/April or parts of October

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bartonp

posted on 27/2/07 at 12:46 PM Reply With Quote
Forgot to unhitch trailer? (Look in rear view mirror)
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MikeR

posted on 27/2/07 at 12:48 PM Reply With Quote
if its light throttle, idle valve playing up / throttle body covered in oily deposits - i'm amazed the difference cleaning mine has made.

lambda sensor sending poor readings (although i'd expect the engine management light to be on for this)

I'd be tempted to agree with the fuel pressure suggestions.

If it was BMW i'd say when was it last serviced, heard from this forum that the engine automatically reduces power as it gets close to (or maybe goes past) service time.

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russbost

posted on 27/2/07 at 01:14 PM Reply With Quote
Believe they are known for tps (throttle position sensor) problems, will cause slight hesitations, delayed pickup as throttle is applied - if it's this should always happen at around the same throttle openings but will not be revs dependant.





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Humbug

posted on 27/2/07 at 01:41 PM Reply With Quote
quote:
Originally posted by russbost
Believe they are known for tps (throttle position sensor) problems, will cause slight hesitations, delayed pickup as throttle is applied - if it's this should always happen at around the same throttle openings but will not be revs dependant.


Thanks all for the suggestions. Russbost - this sounds like the symptoms I am seeing - happens when I have the throttle pushed a fair way down, i.e. when accelerating, or when maintaining cruising speed. I will give the wheels a check just to see if it's the brakes, then back to the garage.

Edited to say that no warning lights are on

[Edited on 27/2/07 by Humbug]

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britishtrident

posted on 27/2/07 at 02:09 PM Reply With Quote
Classic Fuel flow problem symptoms, ---- pump, filter, regulator, blockage in line, free floating debris in tank.
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