Re: Flat running

["cruznmd" <racuti1@xxxx>]

My control pressure regulator -is- brand-new. 

My freq valve is buzzing away happily.

Unfortunately, the fuel injection manual I have points to the control
pressure regulator for several of the symptoms I have.

So, even though it's new, I want to put a fuel pressure gauge on it.

I have greatly increased the power through the adjustments I've made
so far, and it doesn't stumble or hesitate any more at all, hot or
cold, but that doesn't mean I'm doing it right.

Like you say, I probably won't really know until I put the gauge on it.

Rich

--- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@xxxx> wrote:
> More than few DeLoreans have messed up the fuel system adjustments by 
> turning the fuel mixture screw in order to compensate for some other 
> problem in the fuel system. I mention this because the mixture can 
> only be set properly when you know ALL fuel system components are 
> functioning correctly. It was sealed originally to prevent tampering 
> and was set with everything working correctly. So, correct adjustment 
> is critical to proper overall performance. Spark, etc. has to be in 
> good order too and no vacuum leaks.
> 
> There is a dwell meter, voltage process set out in the operating 
> manual that can get the fuel system adjustment very close if not 
> right-on without using the CO taps. A critical piece in the fuel 
> regulation is the pressure regulator mounted on the valve cover. You 
> MUST know if that is working correctly. About the only way to know is 
> with fuel pressure gauges, or just put a new one. The Lambda is a 
> fuel enrichment machine that must also be functioning correctly for 
> adequate engine performance. That can be checked fairly thoroughly 
> without special tools by just listening to hear if the frequency 
> valve is buzzing. If it isn't you need to find out why not.
> 
> If the engine was stumbling when cold but fine when hot then the cold 
> engine enrichment cycle is messed up. Either the pressure regulator 
> or some other component. Not the fuel adjustment. A DeLorean with a 
> proper functioning fuel system does not hesitate or stumble, ever.
> 
> I would start by methodically checking all major pieces for proper 
> function and see if you can get the fuel system adjusted - engine 
> hot - with the dwell meter process; then check the other stuff.
> 
> Harold McElraft - 3354
> 
> 
> 
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> > I agree that the WOT wouldn't be the sole cause of this.
> > I put the timing light on the engine and the timing advanced as I 
> > revved it up. It appeared to be in spec with what the manual 
> required.
> > The advance solenoid clicks when I open & close the idle 
> microswitch 
> > but that doesn't necessarily mean it's working does it? 
> > 
> > Vacuum lines are routed in accordance with the diagram in the 
> engine 
> > cover.
> > 
> > Initially, the car idled roughly and would hard start cold and I'd 
> > have to feather the gas to keep it running. It appears that the 
> cause 
> > of this was incorrectly set CO screw. I started richen the mixture, 
> > and keep the idle sane by adjusting the throttle linkage (which was 
> > on an extreme end anyway by P.O.) and re-setting the timing. 
> > 
> > Now it starts and idles like a dream from stone cold. It has more 
> > power, but still not enough. I feel I have a little more play with 
> > the fuel mixture but when I reach the point of diminishing returns 
> > I'll have to put a pressure gauge on the system and check control 
> > pressure.
> > 
> > Rich
> > 
> > --- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@xxxx> 
> > wrote:
> > > The WOT on has a minimal impact so I doubt if that is not your 
> > > problem. Does it start and idle OK? If so, I would suspect 
> failure 
> > > in the vacuum advance system somewhere, the throttle plate is 
> > > sticking or, the idle motor switch that operates the vacuum 
> advance 
> > > solenoid in unison with the idle motor is stuck too, like your 
> WOT 
> > > micro switch. Are the vacuum hoses routed properly? Double check 
> > > this too. Timing light is a tool that can tell you if the advance 
> > is 
> > > operating.
> > > 
> > > Harold McElraft - 3354
> > > 
> > > 
> > > --- In dmcnews@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> > > > My suspects are: timing advance failure, combined with the 
> > absence 
> > > of 
> > > > the WOT microswitch, and/or maybe some smaller vac leaks. Any 
> > > > additional suspects are welcome.
> > > > 
> > > > Rich
> > > > #5335