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General Afr's get richer for no reason?

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Havoch

Proven Member
48
5
Apr 15, 2019
Mission, BC_Canada
Not sure if this is the correct spot for this but....

I just installed a freshly built motor into my spyder with the same injectors that came out of the old motor. Car starts and idles great and would seem to be right around 14.5 but when I give it a rev it dips down to below idle speed and will stall or close to it.

Also, once I give it that rev, the AFR'S slowly go from 14ish to 13ish, and down to 11ish.

I haven't had a chance to look into it yet so not sure if it could be a tuning issue or sensor, or what. Tune was rock solid on the other motor before it was pulled so.... ???

Idle is steady and vacuum is consistent.
 
The fuel will get richer as you rev it and thats normal then it will lean out after.

As for the stalling its a new engine so the old tune may not apply to this new one as things alter slightly. So your biss screw may be set wrong. ISC may not be adjusting enough so you will need to go into Ecmlink and adjust all these in there to get the correct air flow for the nee engine you just rebuilt. Even things like a simple gasket can mean a stall or once was working with the blown gasket and now wont idle right with it fixed, so its a strange thing but just re adjust the tune and set the idle batter this way and hopefully.......... Your idle rev / nesr stalling should go away
 
yup! add isc to your stream and get it to around 30 for a nice idle. play with the 0,50,100 hz mafcomp sliders once the car is warmed up in closed loop. The ecmlink site has all the idle and cruise data on their website.
 
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