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Microtech Low throttle cruise causes a rough afr

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Old 11-09-11 | 05:42 PM
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RotorsRulePistonsDrool's Avatar
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Low throttle cruise causes a rough afr

I know the microtech is meant for drag but I still shouldn't have this issue. When I cruise down the road at any given rpm/mph and I only need to give a tiny bit of throttle to maintain speed; the wideband goes wacky from the solid 13 and 14's to 15s and 16's. The engine blargles and basically has a hiccup. As soon as I give it any more throttle its smooth as can be. I have tried richening the "rpm_cruise" map and no change.

I noticed that there is a decel function, it might be possible the low requirement of the throttle tells the lt10s that is decelerating and fights itself. Is it possible to adjust the decel to add fuel?

In any case, I will eventually find a reputable tuner up here Washington, but I want to drive it around to fully break in the engine (coming up on 300 miles) and save some cash as tuners are expensive... Got any ideas on what settings to play with?
Old 11-09-11 | 07:34 PM
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rpm cruise map??? when you r cruising check where you are at 05hg 10hg etc etc . add some fuell where ever your at
Old 11-15-11 | 05:46 PM
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To the load, rpm cruise, idle map, there are a bunch and still not much change when adding fuel. I need to take it to a tuner I think...
Old 01-05-12 | 11:39 AM
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Its most likely the TPS. ////re-calibrate it.
Old 01-05-12 | 12:45 PM
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also check when the cruise map is engaging, may have to set the on point to a lil lower vacuum.
Old 01-05-12 | 03:35 PM
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Disable the ridiculous carburetor mode that uses cruise, RPM_WOT and other correction maps and set the ECU to matrix mode. Then tune it in the matrix. You'll be able to see where in the map your cruise ranges are.

Plus, make sure that your PUMP settings are not being triggered due to vacuum fluctuations. You can set the pump to use the TPS if you have a full range TPS installed.
Old 01-27-12 | 02:16 PM
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Thanks for all the inpit, Been playing with settings and things. But am now in the process of installed water injection to make things more complicated for me hahahahha
Old 01-28-12 | 01:03 AM
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sounds like injector staging to me

mine does the same thing at certain speeds on the freeway until i push it past to choose all on or primary only, the ECU likes to hang out in limbo for extended periods of time while staging if you are right on that edge.

Last edited by RotaryEvolution; 01-28-12 at 01:08 AM.
Old 01-28-12 | 02:43 PM
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might be a bit too lean on that area rpm vac etc
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