Dashpot adustment

Cherryelky305 · Nov 10, 2014

1991 crx hf 1.5

Adjusted dash pot trying to solve high (and surging) cold idle. Book says 2000 rpm +- 500. Got it down to 2400 and ran out if room to adjust the tab.

Should I be looking for a vacum leak or is it possible to not get it down to 2000 rpm

And yes I know 2400 is within spec, but I want it lower.

My only thought is to grind the tab

KevinEF7 · Nov 11, 2014

2400 rpm is not within spec. I believe its 750 +- 50 on the HF

Sounds like you need to take off the IACV and give it a good cleaning, and reset the ecu and do the proper idle learn procedure.

Cherryelky305 · Nov 11, 2014

I cleaned the iacv and it fixed my hot idle surge. The book I'm using is the Honda manual.

The book covers the 1.5 and 1.6 civic. What I do is use the mechanical sections for the 1.5 and the control sections for the 1.6. It says remove vacum hose 6 and adjust. 2500rpm +- 500. Which would be 2000 - 3000 rpm. As I read it 2400rpm is within spec.

sxysweed · Nov 13, 2014

That's assuming you have a vacuum leak. Actual idle shouldn't be that high.

Have you tried messing with the idle screw on the throttle body? Have you made sure you have no vacuum leaks?

Dashpot adustment

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