Question about 2005 Volkswagen Passat

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Reduced power on hills or inclines

Could this be a fuel filter or o2 sensor problem? The coil packs and plugs are new.

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It could be either, but I'd lean toward the fuel filter for three reasons - first off, that symptom is usually indicative of a clogged fuel filter (you drive fine when the road is level and your engine doesn't need too much power, but when you go uphill, or punch it to pass, it bogs because the filter is clogged and restricts the flow of fuel to the engine). Also, I'd do the filter because it's both easier and cheaper, and even if it doesn't fix the problem fully, the fuel filter is a wear item that needs replacement periodically and you're therefore not wasting money by buying one and installing it. Finally, a bad O2 sensor will usually throw a fault code and a check engine light. It has to be fully "bad" to do so, and could be getting there but not bad enough yet to throw a code, but the fuel filter is a more likely candidate. Change that out and see if the problem goes away.

Posted on Jul 25, 2008

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I have a 01 ford taurus. It has no power going up hill. Why would cylinders 3$4 be missing after I changed plugs wires o2 sensors fuel pump and filters


Well sounds like You went after the Wrong Problem. Start with New Spark Plugs then a Possible Coil pack Problem. let Me know

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My 2002 S40 shakes when the car goes up a steep hill and smooths out when the road levels.


Most up hill problems are Ignition related,such as
individual cylinder coils or a coil pack, depending on
what your car has.

You may or may not have a check light on the dash

A more violent & more sudden, somewhat similar lack
of up hill performance ,would be the EGR Valve.

If you never had any trans issues since the car was new,
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I will assume your spark plugs have been in the motor less
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Also not really related but effects fuel trim or adjustment,is the
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Check fuel pressure with a gauge. I like to go on a road test
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Any kind of vacuum leak will cause a problem

Make sure the air filter cover is on correctly

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means misfire in #5 cylinder. found this for you. hope this helps
Common Problems That Trigger the P0305
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  • Incorrect ignition timing
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  • Defective Crankshaft and/or Camshaft Sensor
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Common Misdiagnoses
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