Valve Train noise

rambo at diversicomm.com rambo at diversicomm.com
Thu Jan 16 21:36:39 GMT 1997


Greetings:

     I am the most recient victom/customer of Electromotive.  I
purchased a TPI
and mounted it on a HO 5.7 L Chevy ZZ3 crate engine.  The unit came with
31 lbs/hr injectors.   The first Tec II they sent me was defective and
quit at
operating temp.  after a couple of weeks of torture I was able to get
Electro.
to send me a replacement that was not new but did work.  In the mean
time
their Tech.'s were sure that the 32psi I had with the intank fuel pump
was 
cause of my trouble.  I, being new to EFI, did not see how fuel
pressure could
cause this but nontheless installed the inline pump that came with the
unit.

     Now we have over 100psi. the Holley type vacume operated fuel
pressure
regulator keeps it level at 47psi.   I have narrowed the pulse sqrt.
time much as
I can and keep the fuel/air balanced at idel.  However, each time the
engine
experiences load conditions I hear valve noise.  The kind of noise I
most 
commonly would associate with poor fuel.  110 octane and valve
adjustment
has helped but, not as much as narrowing squt.   Still I have valve
train noise.

Any Ideas on how to solve this prolem short of canning the system and
bolting on a one barrel, magneto, and adding a timing stick to the
steering colum?

Ray.





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