Valve Train noise

[Mazda Ebrahimi]

rambo at diversicomm.com wrote:
> 
> 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.


Hi Ray,

Here is a couple of questions / comments:

1)  Have you calculated the size of your injectors?

2)  Have you verified the pulse width, RPM, and spark timing shown on 
the TEC screen are actually true?

Best Regards, Mazda