Idiling high EMS4
#1
Idiling high EMS4
Finally got it up and running, but I haven't been able to tune as the idle is way to high. Here is what has me baffled- after cold start it idles about 1300. and then once it gets to normal operating temp. it idles at 2800 to 3000. I fiddled with the idle target table and it does not change a thing, and then unplugged the iac with no change either. I closed the idle screw completely on the throttle body and got it to 2400. It seems that there is definitely a vac. leak somewhere, but thought that it was odd that it seems to be ok when cold. Before I take it to the shop to do a smoke test thought I would see if anyone has suggestions of obvious things I am not thinking about.
#3
I did put a timing light on it today and it matched what the ECU was reading (27) at 2400 rpm. I did not check the timing when it was cold. I previously had this set up in a 2000 running in more of a parallel setup where the stock ecu was controlling idle, and it is now in a 1990 and the EMS is controlling everything.
#7
One other issue I am having is no tach. I am using the trackspeed patch harness and it has tach run to GPIO 8. I tried both gpio 8 inverted and not with no success. Does anyone know if there are other settings that need to be changed to get the tach to work?
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Zaphod
MEGAsquirt
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10-26-2018 11:00 PM