Cleaning Injectors

[Robert Gallant]

Hmm, that me be a good point about dirty injectors causing it to run
rich.

I run an isolated fuel pressure gauge in the car.

Fuel pressure holds for a LONG time after shutting down.

I also reference fuel pressure to manifold pressure/vacuum and it
appears to have the normal swing of 38 psig fuel pressure at 0 psig
manifold pressure up to 48 psig at 10 psig manifold pressure.

The injection set up is with primary/secondary injectors.  The
secondaries are a lot larger than the primaries.  So when the
secondaries turn on at 4000 rpm (along with the primaries), the car
usually runs on the rich side (just the way I like).  Lately, when the
secondaries kick in, the a/f ratio drops.


> IMHO   dirty injectors will make it run rich, not lean....because they will not
> adequately turn off the fuel...they are blocked open...
> check the pressure drop after engine is turned off, or run pump with gauge on
> the rail turn pump off, and check pressure drop...IF it drops like a rock, the
> REGULATOR os probably got some dirt in it....
> Run the pump,  and pinch the RETURN line from the rail to the tank....pinch it
> untill the pressure rises at least 50% off the static reading....then unpinch
> the return line quickly....use pliars...and note the leakdown again...it may be
> ok now...fair chance of it.....
> the reg couldn't close all the way, causing lo-pressure, hence less fuel...runs
> lean....GENE

-- 
Rob
MailTo:gallant at oasys.dt.navy.mil