Pressure tranducer testing at fuel pressure regulator
Posted to Technical Theory Forum on 8/22/2010
33 Replies
Hello.
Lately ,I have been doing more testing at the fuel pressure
to compare and to recognize problems.However, I am getting
some mixed results on interpreting the waveforms. For
instance I was working on a 1996 windstar with a rough idle
. Here I just want to discuss this waveform with transducer
at fuel pressure regulator. [Waveform] In this
waveform, a=synced from cylinder 2 (2ndary) b=first look at
pressure regulator seeing injector pressure drop .1996 ford
winstar 3.8 .This engine fires sequentially 142536 (waveform
shows 253614) bad injectors? I have a parts van with same
engine and changed out all injectors and the pattern didnt
change much. Is this pressure testing at regulator not a
very solid test to do?
I checked another car that did not have any driveability
issues.
2001 altima wiith 2.4 engine. Taken at idle with 1st look
transducer .Sync in red is from number 1 2ndary. The 1st
look sensor is in fuel pressure regulator with vacuum
plugged. Here is the waveform. [2001 Nissan Altima GLE,
Waveform]. I cannot make any diagnostic decision form
this. 2 more from same car instead I am using the pico
transducer. [2001 Nissan Altima GLE, Waveform] This is
from the same recording but what in the world is happening
here? [2001 Nissan Altima GLE, Waveform].
Is this testing method not a consistent valid test?
Mark from Ontario
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