2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Throttle Body Aftermath

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Old 06-02-04, 12:30 PM
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even when you let off the gas, the injectors should still flow some. Hence idle.
Old 06-02-04, 02:21 PM
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It's not detonation, your ok, might damage ur cats if u have any
Old 06-02-04, 02:43 PM
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Engine, Not Motor

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Are you absolutely sure that the TPS is adjusted properly? By properly I mean using the resistance method and not those ridiculous test lights.

Also, how's your ACV? A bad ACV will certainly cause popping in the exhaust on decel...
Old 06-02-04, 03:16 PM
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Originally posted by fastrotaries
even when you let off the gas, the injectors should still flow some. Hence idle.
Nope, none.

I know this because the FSM says there is fuel cut under decel. And my wideband goes off the scale lean.

James
Old 06-02-04, 04:29 PM
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I'm a boost creep...

 
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Originally posted by J-Rat
And fuel never stops flowing, even at 0% throttle.
Originally posted by fastrotaries
even when you let off the gas, the injectors should still flow some.
You're both wrong. All EFI systems turn the injectors off when the throttle is closed, to save fuel and prevent bucking under decel. They're switched back on at ~1500rpm so the engine can idle.
Old 06-02-04, 05:46 PM
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Aaron, who are you asking that?
Old 06-02-04, 09:42 PM
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Originally posted by fastrotaries
even when you let off the gas, the injectors should still flow some. Hence idle.
My bad. I was sure it was/would be understood that they come back on. Hence idle as you said.

But they do completely shut off. Easily observed by backprobing an injecotor and watching it as you let off the throttle. Meter either on Duty Cycle or just watch the voltage.

Also easily observed by reading the FSM.

Last edited by HAILERS; 06-02-04 at 09:44 PM.
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