> Yes it was; so I can't say the pulsing in the fuel pressure was

interfering

> with the operation at lower rpm; it was, at the least, indicative of

uneven

> MAP and likely very hard on the FP regulator.  I haven't run lower than

> about 1500 yet since that is where the idle stop is set; and I am pursuing

> other issues. But it does now run smoothly at that speed - secondary

> injectors only.  The other issues are that the "staging" is not working;

it

> does not run completely smoothly with both sets on; less smooth on primary

> only; and very smooth with secondary only (primary turned off).  If you

can

> figure those things out for me, you win the cigar.  Still waiting on a new

> chip for the EM2, but the next time I run I'll slow it down further.

>

> Al

>

Al, here's one possibility that you might considered

 

1.  A problem in the EC2 sensing manifold pressure being sensed.  In other

words, it is "staged" all the time which if the case would of course provide

too much fuel at the lower rpms with all 4 injectors on.  Switching off the

primaries then "destages" the circuit and you get a smooth idle at lower

rpm.  Could be the MAP sensor or your manifold pressure sensing hose.

 

I guess the order in which I described the behavior was confusing.  It is smooth at low rpm and MAP when the primary are off; requires a bit of leaning and is less smooth when both are on; requires still a bit more leaning and runs the worst when the secondary are off.  The EM2 is reading the MAP sensed by the EC2 sensor. The EM2 reading is about 10% too low according to a vacuum gauge that I T’d into the line.

 

I set the EC2 to mode 7, ran the engine up to 15.5” MAP based on the gauge, and pressed the set button; to try to be sure the stage point was properly set.  Didn’t seem to make any difference.

 

2.  Have you tried the "B" controller? same results or different?  If it

were the A controller MAP sensor or its sensing hosing then switching to

"B:" should cause it to run smoother.

 

I had tried controller B before I had the MAP filtering set up, but the behavior was the same as A.  Right now I have the vacuum gauge connected in place of controller B.

 

3. Primary injectors could be leaking - but, if it were truly leaking then I

wouldn't think turning off the primary would stop the leak.

 

The fact that it is running well on the secondaries but runs worst when both

are on

 

Was there a thought here that got interrupted?

 

Thanks for your thoughts here Ed.  I have again checked wiring and grounds, etc., and don’t know what I’ll do next.  Checked the staging relay and secondary power circuit is “on” when everything is off (relay not energized).  With engine off, EC2 on, relay is energized and secondary power is off (not sure this is normal).  However; with engine running and MAP below stage point, relay is not energized, and secondary power is “on” (not normal).  Relay coil connects to +12 and to pin 35, which I understand closes to ground when MAP is below staging point.

 

Al