Running rich

[dave.johnson at gb.abb.com]

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There's definitely no MAF/MAP input to the ECU - this is an early 80s bike.
It has standard exhausts but, given the age I would expect it to flow
better leading to a weaker mixture?
Intake is also standard and I've tried running without the air filter in
place which would again lead to a weaker mixture.
The fuel regulator does reference MAP (it's plumbed to inlets 1 and 4) and
the pipework for this has been replaced as it was perished.

I think I need to check the fuel pressure. Are there any guidelines for
pressure to fuel ratio if the injector fuel rate is known?

Dave Johnson


                                                                                        
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Subject:  RE: Running rich

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>I have a Kawasaki GPz1100A1 (ZX1100) which has F.I. as standard but is
constantly running rich. Confirmed by the plugs
>being a definite sooty black. Unfortunately, I don't have means to test
O2 or CO exhaust content.

>The only sensors monitoring the engine are engine temp, air temp,
throttle position and engine speed. These all check out
>OK and appear to be within tolerances.

No MAP or MAF? If the ECU doesn't compensate for MAP or MAF it cannot
deal with any changes in the
intake or exhaust system.

General bike experience would have me check the following:

Is the exhaust standard?
Even if it is the insides could be rusted or damaged, changing the flow
considerably.

Same for the intake stuff, airbox etc. Is the airfilter original? A
cheap aftermarket or
a dirty airfilter could be reducing airflow enough to throw of the
factory mapping.

I have a throttle rack stripped out of an early 90's EFI Kawa. The fuel
pressure regulator
references to MAP, not atmospheric. This allows the ECU to get away
without an explicit MAP
input. But the setup was still not happy with major changes to the
plumbing. Are you sure
the regulator is OK?

N.
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