Megasquirt The car starts, but.... (Tach Problems)
#1
The car starts, but.... (Tach Problems)
I have an interesting problem on my hands here. I just got the engine (S4 TII) rebuilt and dropped back in the car, and then got everything else back together and set up the past few weeks (waiting on parts). Tonight, after a bit of fiddling with settings, pots, and reloading 029w (it stopped communicating with my laptop), she was ready to start.
I cranked it a few times before connecting the plug wires to the plugs in order to fill the oiling system and make sure everything was properly lubricated, and then reconnected the plugs. On the first bit of cranking, she started to catch, and a little bit of gas maintained it. Rich as hell, but started with almost no effort on the first try! (on a rebuild?) I look down at the computer screen to see the afr, and notice that what feels like a low, lumpy idle is actually reading around 2000 rpm on the screen. Sure enough, the tach was reading the same. Very odd. I killed the engine and tried to restart it, and it did restart, but I noticed that during cranking both tachs were reading 1200 to 1500 rpm. What could be causing this? its got me confused. I know that the stock tach is triggered from the trailing coil, so I guess the MS is firing the coils as if the engine were running that fast? Why would it be reading such a blatantly incorrect speed?
Summary: Tach and megatune display showing 1500 rpm while cranking, moreso while running (very poorly). Why?
The attached file has my .msq along with a short datalog
Thanks!
I cranked it a few times before connecting the plug wires to the plugs in order to fill the oiling system and make sure everything was properly lubricated, and then reconnected the plugs. On the first bit of cranking, she started to catch, and a little bit of gas maintained it. Rich as hell, but started with almost no effort on the first try! (on a rebuild?) I look down at the computer screen to see the afr, and notice that what feels like a low, lumpy idle is actually reading around 2000 rpm on the screen. Sure enough, the tach was reading the same. Very odd. I killed the engine and tried to restart it, and it did restart, but I noticed that during cranking both tachs were reading 1200 to 1500 rpm. What could be causing this? its got me confused. I know that the stock tach is triggered from the trailing coil, so I guess the MS is firing the coils as if the engine were running that fast? Why would it be reading such a blatantly incorrect speed?
Summary: Tach and megatune display showing 1500 rpm while cranking, moreso while running (very poorly). Why?
The attached file has my .msq along with a short datalog
Thanks!
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