idle loping
07-25-2002, 02:54 PM
#1
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idle loping
hey.
engine is running fine after the rebuild. i get a funny loping thing going on at idle. i get a pretty good and steady idle at most times dead on at 750 then other times i get a loping up and down kind of rhythmic up and down 100 or so rpm. i have not yet fine tuned the hondata but i'm running open loop on my original fuel maps. wideband showing maybe just a tad rich.
I see my tps reads about .53 V (about 2-3%). its always read about that anyways and never caused a problem. other peoples cars i have tuned i have seen anywhere from 0.46 to 0.55.
any ideas? vacuum is good, no signs of leaking.
torin
engine is running fine after the rebuild. i get a funny loping thing going on at idle. i get a pretty good and steady idle at most times dead on at 750 then other times i get a loping up and down kind of rhythmic up and down 100 or so rpm. i have not yet fine tuned the hondata but i'm running open loop on my original fuel maps. wideband showing maybe just a tad rich.
I see my tps reads about .53 V (about 2-3%). its always read about that anyways and never caused a problem. other peoples cars i have tuned i have seen anywhere from 0.46 to 0.55.
any ideas? vacuum is good, no signs of leaking.
torin
07-25-2002, 07:38 PM
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Re: idle loping (GruvyTune)
Since the rebuild may have changed your vacuum at idle, you could be idling on different load points. Cycling back and fourth between richer and leaner points.
TPS at 2% isn't that good. The TPS should be at 0 for the ECU to try and lock rpm with the IAC. I'm not certain if the stock ECU has some slack built into it to recognize that the throttle is fully closed dispite the slight TPS high reading.
I don't believe the Hondata gives you alot of control over the IAC, does it? Go through the stock idle setting listed in the Halms manual. Set idle without the IAC connected, reconnect it and make sure it adjusts properly.
TPS at 2% isn't that good. The TPS should be at 0 for the ECU to try and lock rpm with the IAC. I'm not certain if the stock ECU has some slack built into it to recognize that the throttle is fully closed dispite the slight TPS high reading.
I don't believe the Hondata gives you alot of control over the IAC, does it? Go through the stock idle setting listed in the Halms manual. Set idle without the IAC connected, reconnect it and make sure it adjusts properly.
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