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Microtech Just a few Q's :)

Old 05-30-03, 12:34 PM
Despise Enmity
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Just a few Q's :)

The pump functions that I've seen in my datalogs as far as I can discern of how they work (confirmation?).

A certain amount of TPS % change is noted set by the PumpxTrig. When that change is noted, the injectors fire the listed percent at the pulsewidth set.

Reason I'm asking? Say I'm sitting at idle, and punch the throttle...I get a pump action that almost kills the car. Now my cats are clogged as **** and have resulted in an exhaust leak, so backpressure may be a factor. Typically, it's pump1 coming on noting a change in the TPS %. What happens with the vacuum is, it goes from 17-19" at idle to a LOW number like 5-8". Am I setting the minimum pulse too high so it boggs the motor?
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Old 05-30-03, 03:59 PM
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The Pump1Trig and Pump2Trig functions are activated by whatever your no-boost load reference is - it's likely MAP on your setup, unless you've changed something. When you pump the throttle, vacuum will decrease, since you're opening the throttle plates. You'll have to check the wideband to see whether it's rich or lean, and adjust accordingly. Your map will need retuning (and your pump settings need readjusting) once you open the exhaust.

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