help!!!! engin power loss at speed - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

robwrightham · 08-20-2009, 01:12

Please help me i drive a 2003 ST170. And at high speeds after long journeys or hot humid weather my car starts to kangaroo as if theirs no petrol (even with a full tank) usually around 3000 - 4000 rpm especially when i ask the engine to accelerate. i have changed spark plugs, manifold inlet thingy, coil pack, air filter & fuel filters. their are no engine management lights and its really frustrating as i work 1hr from home so this happens every journey, i have asked my local ford specialist but they suggested the manifold inlet thing at considerable cost but no luck.

oaktree · 08-25-2009, 15:14

change ur stark plugs see if that helps

**Bert** · 08-25-2009, 15:37

How many miles are on it? You might try getting a fuel volume and pressure reading to see if they are in specs. It's possible your fuel pump is going out. Check those and see what you find.

robwrightham · 08-26-2009, 04:11

i have change the spark plugs al ready but no good. its done about 50000 miles. do all garages perform a fuel volume and pressure reading?. a mate sugested mayby an air leak is possible cause is this reasonable?

**Bert** · 08-26-2009, 07:32

It sounds like a fuel problem. Any good shop will be able to do the test.

dzro · 08-27-2009, 05:22

Maybe the DPFE sensor? The symptoms you describe sound similar.