fuel rail pressure sensor bad? - Mustang Evolution

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Old 06-05-2014, 07:48 PM   #1
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Posts: 1,291
fuel rail pressure sensor bad?

So my car shudders when I apply the throttle after cranking it up the first time it sits up over night. What are some symptons of one going bad besides check engine light and fuel in the vac line? I know this is a common problem on boosted cars so someone that has seen this issue can chim in. Tune is fine and ive have changed the 02 sensors, maf, fuel pump, IAT sensor, coolant temp sensors, plugs, COP, and checks for vac leak.

will the FRPS throw a check engine even if it is bad?
I can go out the when the car is acting up and unplug the FRPS and it does GREAT but once I plug it back up it starts acting up with NO CHECK ENGINE LIGHT.

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Old 06-05-2014, 11:54 PM   #2
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I believe that it should throw a code if it malfunctions.
Hmmm. Tough one. Something must be going on with it, from the result of your "experiment"...
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