power loss

[loudandfast]

help again please.sometimes the engine (2.9) looses power when acelerating at about 3000rpm then bursts back.have replaced the throttle pot,dist cap,rotor arm,plugs,leads,and coil. has anybody any ideas????

[Paul V]

Are you sure the pot is ok, that’s exactly what mine was doing when the pot failed.

[loudandfast]

the pot is only a week old as is all other components

[johno]

I've had several throttle pots go on my 'S'. One lasted 3 days !! So don't rule it out. I currently have a throttle pot on mine which is the part supplied for the Cerberra S6 engine. Works perfectly and is the longest lasting by far !! Additionally it is less than 1/2 the price of the Ford part.

[350matt]

If you drive gently can you get it past 3000Rpm? As the problem sounds like fuel starvation, check fuel pressure, fit a new fuel filter and presuming that your 2.9 still has the Bosch mechanical injection (K-jetronic) then check the metering head supply pintle for smooth operation and the injectors for blockage (spray into a container, all should be the same)

Matt

[loudandfast]

nope 2.9 has electonic not mechanical fuel injection and is not fuel related.

[mhibbins]

Rev the engine from under the bonnet and see if the breather hose from the plenum to the rocker cover collapses - it routes around the distributor and can get kinked. Mine collapsed a while ago and I got similar problems to you but not fixed to a particular rpm. It's just an oil pipe from ford and only costs about 3 or 4 quid to replace if that's the problem.

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Mark

[loudandfast]

found the problem to be dodgey wireing in the "tps" plug, one pin was not makeing and brakeing contact with the plug so i squeezed the contacts together and all is fine now.
thanks everybody