I have a 98 civic dx with an LS/VTEC swap

OBD1 conversion with Hondata s200 with 3-step and datalogging

Whenever I push in the clutch my car idles down to like 400 RPM & sometimes dies...... what could it be???????????

I switched the wires in the IACV and it still does the same thing..........

There is no CEL either.

 

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My friends VW GTI 1.8T does the samething. We are trying to figure out what the problem is. We checked everything and came down to the conclusion there maybe a vacum leak. Does you car idle smooth? Also seeing how you have the 3 step possibly check to see if it is setup correctly. If you figure out what it was please let us know. If it was you IACV it would more then likly be idling funny. Try another ECU aswell.

 

could be tuning. I had the same problem. Had a ls vtec and mine did the same thing. I dealt with it cus it only happened every so often. Then i got re-tuned and some point and it never did it again. Never changed anything ont he car either so idk.