Been fighting this idle issue the last few days :cussing:. Current symptoms, during cold start, idle bounces between ~900rpm and ~1300rpm until it warms up. Once at operating temp the idle settles at around 850-900rpm. Once I am driving, the other problem is the car stalls often on deceleration. Say I'm coming to a stop sign/light and I push in clutch and brake to stop. Well, instead of the rpms dropping down to 850rpm and idle'ing, the rpms drop low, under 500rpm. Sometimes it stalls, sometimes it catches itself and gets back up to 850/900rpm idle. I can sometimes reproduce this just sitting here in my garage at idle, and blip the throttle, it will drop real low then come back up. I took some datalogs of this is anyone wants to look.
Relevant info:
d16y8 block/z6 head, low compression ~8.8:1, new engine, ~350 miles on it.
y8 intake mani with b16 tbody
40 micron fuel filter, fuel pressure set to 38psi with pinched off fpr vacuum
Hondata s300 loaded with stock p28 calibration (min idle 850rpm)
What we've done:
-fixed bad vacuum leak, don't think there are anymore vac' leaks cause I can plug the tbody up with my hand and engine will immediately stall
-clean out iacv with carb cleaner
-calibrated tps sensor per helms, ~.4v closed ~4.6v fully open I believe were the recommended.
-adjusted idle screw with iacv plug still connected. If I tried to set the idle like the helms says, by unplugging iacv connector, the car just stalls. I cannot keep an idle at all with the iacv plug disconnected.
-reset timing after that
-re-adjusted throttle cable
-swapped in my Hondata 4bar MAP sensor to try, same problems (I also uploaded new calibration to the hondata to reflect MAP sensor change).
A few other things I cannot remember off top of my head but basically anything related to idle problems.
Really not sure what is causing this. I have taken everything apart again and re-cleaned iacv and tbody one more time. I noticed my tbody plate sticks a little, so tried to fix that. The throttle stop screw was not touching the throttle link arm, so I screwed it in a bit more enough so the throttle plate wouldn't stick but still appeared fully closed. I have yet to test after these changes.
Hondata datalog:
http://jackmoves.com/~justin/warm-idle-decel-drops.s3d
Justin
Relevant info:
d16y8 block/z6 head, low compression ~8.8:1, new engine, ~350 miles on it.
y8 intake mani with b16 tbody
40 micron fuel filter, fuel pressure set to 38psi with pinched off fpr vacuum
Hondata s300 loaded with stock p28 calibration (min idle 850rpm)
What we've done:
-fixed bad vacuum leak, don't think there are anymore vac' leaks cause I can plug the tbody up with my hand and engine will immediately stall
-clean out iacv with carb cleaner
-calibrated tps sensor per helms, ~.4v closed ~4.6v fully open I believe were the recommended.
-adjusted idle screw with iacv plug still connected. If I tried to set the idle like the helms says, by unplugging iacv connector, the car just stalls. I cannot keep an idle at all with the iacv plug disconnected.
-reset timing after that
-re-adjusted throttle cable
-swapped in my Hondata 4bar MAP sensor to try, same problems (I also uploaded new calibration to the hondata to reflect MAP sensor change).
A few other things I cannot remember off top of my head but basically anything related to idle problems.
Really not sure what is causing this. I have taken everything apart again and re-cleaned iacv and tbody one more time. I noticed my tbody plate sticks a little, so tried to fix that. The throttle stop screw was not touching the throttle link arm, so I screwed it in a bit more enough so the throttle plate wouldn't stick but still appeared fully closed. I have yet to test after these changes.
Hondata datalog:
http://jackmoves.com/~justin/warm-idle-decel-drops.s3d
Justin