MSefi.com read only forum (Jan.15,2018)

All,

I believe Ihave found at least part of the problem. I had the AFR fuel clac setting under other fuel st to use a separate AFR/VE tables. I changed the setting to use a combined VE/AFR table, and it imediately settled down. I have since leaned out the idle and will work on the reso of it ...

Agreed. The injectors and injector drivers seem to be OK. I tried richening the mixture and get a much improved idle. Vigorous acceleration but not WOT is quite brisk, but when backing out of hte throttle and gearing up to cruise speed and throttle position then appling light throttle yeilds a ...

The little LED blinks like champ when its running. I'm going to look elsewhere for issue. Will report back as it is resolved.

Thanks for the tip. I have a 12v led so shouldn't need a resistor. I'll try it and report back.

The injectors are clean an appear almost new. I swapped 2 injectors one working one not both on the same bank. There was no change. It would appear to be at the connector or where the trigger wire for that cylinder's injector is spliced in. Otherwise, all the injectors on that bank would have the ...

That is a thought. I need to pull them to check to see if one or two are clogged once that is done assuming I don't find any thing, I will swap the non performing one with one that appears to be performing. I checked the impediance and they are all within spec and very close to each other. The ...

Ok. Disconnecting bank 1 makes it run slightly worse, and disconnecting bank 2 kills the engine. Would appear that the issue is with injector bank 1. If I disconnect that bank one at a time, 2 injectors have a neglible effect on running and one causes it to run worse. I either have 2 failing ...

The fuel filter is clean, and the problem is intermitent. It runs fine then doesn't while idling. It is as if only half the injectos are firing. I have checked the wiring to the injectors and all relevant connections I can think of. Thoughts?

Richard,

Thanks for the reply. I'm not running a swirl pot or header tank. The fuel system other than the injectors, fuel rail, and pressure regulator is stock Porsche 911 SC with a large filter and accumulator in the system. The tank was flushed a couple of years back and the fuel filter is almost ...

This is a ms2 V3 board running 2.905 fuel only with idle air control and a dual MAP sensors. In the last few days while tuning, the engine runs rough and misses at idle and under load. Attached a date log which indicates that the AFR goes very lean when the rough running occurs at idle. Yesterday ...

I have success. The engine started and runs nicely. To recap, the no tach signal had to do with the c12 capacitor which was still in place from the MS1 install. The rpm reading had to do with D1 being shorted as an attempt to figure ourt the no tach signal. The jumper was removed. The setting in ...

In retrospect, it was the removal of C12 and not the addition of the js10 to IGN jumper that got the tach signal going. Do I maybe need C12 but a different size, or am I all wet and completely out of the ball park? Sorry for the number of posts, but as I experiment and think my way through the ...

I disconnected the js10 to ign jumper and the tach is still way high by about 100 times. The ign light on the stim doesn't light as would be expected with the jumper removed. Is there a setting somewhere that I'm missing that makes the tach signal that the cpu sees off by about 100 times? Any ...

Matt,

Is there any reason in a fuel only application for JS10 to be jumpered to ign? In looking at the schematics, it would appear that the tach signal comes in on 24 through the optoisolator and into the 40 pin socket and into the CPU and doesn't need to go further. Is that correct, or am I ...

Pin 36 in not connected to anything. Should it be?

Two more attachments that didn't make it the first try.

After assistance from the group, I figured out why and corrected the no tach/rpm signal issue. Now the data logs show the engine is running and way above any realistic RPM, instead of showing it is cranking. Thus there is no fuel being injected. I'm running a ms2 2.905 fuel only with the tach signal ...

I now have a tach signal and the rpm moves with input on the POT on the stim. The jumper from js10 to ign was missing. O2 also moves with input from the POT on the stim. I have attached a datalog from an attempted start. The cranking rpm show 25000 plus. Thoughts? Thanks for your help. I'm making ...

Ok. I have been to the manual and found that the jumper from js10 to ign was not installed. I have installed that jumper and now have the ign light on the stim actuated. I still do not have any tach response in Tunerstudio when I move the rpm POT. Thoughts? Thanks.

Randy

Ok. I have the stim completed and attached. It so far has told me what I already know. The temperature sensors work, but the RPM doesn't. Since I didn't build the board, will I need to go back through the build doing all the stim checks until I find the issue?

Thanks for your help.

Randy Hoch