The crankshaft sensor would fit with the symptoms. Often the voltage output from faulty sensors declines with temperature rise so the temperature at which your CKP was checked over is critical. How to check? First check that the electrical connection is clean
and secure; dirt or corrosion can impair an otherwise healthy CKP signal from
getting through. If the CKP suffers from
a drop in voltage associated with heat increase this can only be detectable
with a voltmeter or oscilloscope with a graphical display; an analogue display
voltmeter might just be able to show needle fluctuations due to voltage
variation output. There are two types of CKP:-
2 pin socket (magnetic - sine wave
output). One pin is 'ground' the other
is 'signal'. A voltmeter set to 2 volts
AC (note well) should measure a signal in the 0.2 to 2 volts range on the 'signal' pin. 3
pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is
'ground' and the third pin is 'signal'.
A DC voltage (again note well) should be detectable in the 0.5 to 1.5 volt range from the
'signal' pin. It is important that the voltage
measurement take place at start up when the engine is cold and again, 20
minutes later, when the engine has fully warmed up to operating temperature. If there is a marked decline in voltage output between hot and cold, replace the CKP. If all looks well apply this diagnostic to the cam position sensor CMP (it works in exactly the same way)
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