Weird SD Stalling issue, help!!
#1
Newbie
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Weird SD Stalling issue, help!!
Hey guys i recently just completed the build of my 03 evo 8 that took me over a year to finish. The car got a built short block,head, trans, tcase with an FP green with all supporting mods making 420WHP on 93 oct on speed density. My question is, on hot start i have to hold throttle or else it will die until it warms up a bit (i have seen this be common) and after a bit of cruising to stop at a light i get the infamous idle drop and almost stall then the car catches itself. The weird part is, it did not do this when i picked it up from being tuned it started after about 2 hours of driving. I replaced ISCV with OEM and got same result, fine for about 2 hours of driving then started again. I have boost leak tested which had no leaks and i have re coated throttle body with Molykote 321. I am at a loss here as i am out of ideas! and i find it hard to believe it would be in tuning since it doesn't happen once ecu is reset but maybe I'm wrong. Please help me out guys!
Thanks
Thanks
#4
EvoM Guru
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Originally Posted by hutch959
probably tune.
OR, you need to adjust the BISS.
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brianbarnesevo8 (Jul 23, 2018)
#5
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will try adjusting BISS first then have tune looked into. thanks
#6
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#7
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On my car, I rewired my fuel pump and retained the OEM dual stage. I noticed that when engine is hot and I reatart engine, some of the time, fuel pump relay #3 doesn't want to turn on (to break the 14V circuit). This causes my idle to run really rich since my fuel return is still the OEM -4an and can't flow the volume needed at idle. How do I know this is my problem? I installed a volt signal wire from the fuel pump and I can see that for some reason, when engine is hot, Relay #3 doesn't switch on to break the 14V circuit. I know it is my ECU because I wired in a relay to control 2 relays in addition to the OEM Relay #3.
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#9
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I just reread your post. I didn't read it all the way through. If you are getting this after heating up engine, then it is likely the partial throttle tune. I had same problem like these guys said, when I upgraded to FIC1650, it ran too rich on partial throttle. My tuner drove my car around and kept tuning it until it ran great. And he didn't charge me for the fix (he said that was his responsibility and should have been tuned that way).
#10
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you sir were correct! BISS needed re adjustment now returns to idle perfect!
#11
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I just reread your post. I didn't read it all the way through. If you are getting this after heating up engine, then it is likely the partial throttle tune. I had same problem like these guys said, when I upgraded to FIC1650, it ran too rich on partial throttle. My tuner drove my car around and kept tuning it until it ran great. And he didn't charge me for the fix (he said that was his responsibility and should have been tuned that way).
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