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

If you have access to an oscilloscope, it is easy to see if the injectors are being pulled low by the MS. If your voltmeter has a peak hold function, you can see what the max and min voltages are that are being seen on the low side of the injectors. You could try using the AC volts range, which ...

The way I understand it, less squirts is always better than more, unless something forces you to the higher number. Going from 2 to 4 squirts, cuts your idle pulse widths in half, so you lose precision on the idle control. You also lose one opening and closing time on every cycle, so you have like ...

The question is what if the extra resistance needs to be before the 1M resistor to ground (R11), and not after it like R10 is?

http://www.diyautotune.com/images/circuit_diagrams/v3_o2_input.jpg


Without knowing this I can't tell you it will help to increase the value of R10... even though that ...

Is map or rpm changing so that the VE is changing?

That can mean inter-granular corrosion in (usually) the exhaust and egr passages of the manifolds. The particles can be dislodged by extreme duty or the gross variances in exhaust heat such as in base tuning. I am not convinced this is the case as I would not have expected it up in the FPR and such ...

I installed new injectors and did a compression test today. Here are the numbers (1,3,5,7,2,4,6,8):
150
154
153
154
150
151
145
150

This looks fine to me. Spec is 150 with rebuild at 20psi difference between any two. I started it up and got a good idle with 21" of vacuum.

A little tweaking of the ...

Are the granules attracted to a magnet by any chance?
Some of it does show some interaction with a magnet. What does this mean?

I tested the injectors as I took them off by blowing into a rubber tube and spraying out the gas that was still in them. Most of them showed 5 clear streams, but #4 only ...

Here's what I found on disassembly of the intake.

-Carbon everywhere - there is dust in the plenum and runners. Just below the injectors there is the crusty stuff.
-The EGR passages for the right bank are dirtier than those for the left. This is the side with the O2 sensor and the side that had ...

I picked up one of these from Summit racing. They are only $33.50, so generally backordered. I checked it out with a voltmeter and power supply and it is basically linear from 0-1V, except that below 0.2V, it stops moving (the bottom 10% of the scale is never used). So I programmed that curve into ...

How is your charcoal cannister (if you have one)? Could it have expired and released its carbon into the engine or something? The granuals look very grey, the soot that usually comes with running rich is black i thought.

This was my theory because I couldn't believe that the engine could have ...