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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21975
Experience:  BEng hons Mech engineering, in auto industry 22 years
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my van is losing power, when I accelerate and have the pedal

Resolved Question:

my van is losing power, when I accelerate and have the pedal to the floor the van stays at the same speed, the revs are ok, just no acceleration.
Submitted: 3 years ago.
Category: Car
Expert:  Matt replied 3 years ago.
Hello

you don't say what van but I'm assuming its a turbo diesel of some description so there's some basics which can be checked

check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.
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