Terrh

iTrader: (7)

Got my cold start working... not quite perfect but had no issues starting this morning in -2* weather. Did take around 5 seconds of cranking but that's much better than 10 minutes!

Upped my warmup enrichments a ton too, the car is actually driveable cold now.

Had no issues last night on the new firmware, definatly brought the revs up once or twice under load with no problems.

Today anytime the secondaries came online the car would lean out and not run till they went off. they seemed to "stick" on once or twice as well, not shutting off when they should've, resulting in the car dying from being too lean. I pulled the UIM and verified they were getting voltage with the car on (they are). My latest .MSQ is below, if you see anything in it let me know, otherwise any ideas as to why they aren't working?

renns

You have two staging parameters enabled, but both are set to MAP. If you are using only MAP-based staging, then try turning the second staging parameter off. Who knows, maybe the code gets confused somehow when both parameters are referencing the same variable.

What size injectors are you running that allows fueling to 120 kPa on primaries only? If you want to keep the MAP-based staging, then consider adding rpm as the second parameter, set above cruise rpm, say 4500 or so. Set to 'One Parameter' mode rather than "Both", so it stages when either of the two parameters are met. That way you'll eliminate the possibility of ever running on primaries only at high rpm where you could run out of fuel with your present settings.

TPS-based staging is another alternative, and is my preference. Set to stage once the secondary throttle plates have moved substantially off the closed position. I've had no need for a second parameter for smooth operation using this method.

Cranking/warmup tuning takes some time, as you usually only get one or two chances per day to check it. Once you get a couple temps in the warmup range sorted out, you can easily interpolate the others.

Terrh

iTrader: (7)

I messed with the staging params several times today... shoulda mentioned that *doh*.

None of them, however, have resulted in working secondaries.

I have 720cc primaries. 120KPA + below 3500 rpm (which was how I had it, either one would trigger secondaries)- anyways they weren't getting any crazy duty cycles... should I have this lower? 120kpa is only like, 2.9 psi.

Terrh

iTrader: (7)

well, I dug through the harness and there is nothing wrong with it. the injectors both "click" when I apply power/ground to them so I'm going to have to assume they're OK as well.


Anything in the settings that could cause the MS to stop firing the injectors or is something inside the unit faulty?

Again, just to be clear - when it tries to bring them online it cuts the primary duty cycle right down, so it looks like it's trying to fire them - but it just doesn't.


edit:

I suppose, for all I know, it's firing the secondaries when they come online and just not the primaries. Don't really have any way to check that.


can I hook a test light to the injector leads and rev the motor to see if it is sending them a signal or will that mess something up? (too much load or something?)

renns

Do you know anyone locally with a stimulator? That'd be an easy way to check for proper operation of the injector outputs.

Terrh

iTrader: (7)

yes, I had access to a stim until yesterday when someone hooked the power up to it backwards (luckily not with my MS attached!) - unfortunatly it looks like the smoke was let out of it and I'm not sure I want to hook it to anything until I can verify nothing is wrong with it.

renns

The tach signal generator on the stim might be cooked (555 timer circuit), but the rest is likely OK. Give it a try.

SCCA RX7 RACER

Renn is on the right track with his support. I will tell you what happened to me and it may be the same problem. My car ran fine starting; idle, until my secondary kicked in. At that point the car went lean 19 to 1. Once I came back down to the primary injectors every thing was fine. I changed my staging at the track up higher worse lowered it and no better. I swap out my first MS with a second back up unit and the car pulled 9000 rpm no problems. Just a few weeks ago I repaired it put it in the car and bang 9000 rpm shifts. In my case the Q15 transistor fried and allowed the secondary injector circuit to go to ground rather than to the transistor that operates the secondary injectors. I trouble shooted my problem by comparing the primary circuit to the secondary circuit for problems. Look at the electrical schematics and you will see they are the same except for the signal coming in to the two circuits. You may have the same problem or may not. Just giving you an idea to consider.

Good Luck,
Kim
(SCCA RX7 RACER)

renns

terrh, I forget the details of your setup. Are you running the stock resistor pack, or firing the low-impedance injectors directly from MS? Assuming the secondary injector bank doesn't fire on the stimulator, then some components on the board are likely cooked. Pop the lid and look for signs of overheating.

Terrh

iTrader: (7)

well, I took the MS apart and still no workie.


didn't see any signs of damage.

Yesterday, had to use the car to go to the store, and magically it worked. no idea on why.

I haven't tried the stim with it yet - it wasn't here...

thanks for the input everyone!