TT331FB
04-17-2007, 03:26 PM
Hey experts, I need some input.
As long as the fan stays off, my car idles great. I have the idle at 800 RPM, and its stable. ICS is about 25% duty cycle.
What happens, about 7 out of 10 times, is right when the fan comes on, the engine stalls. 2 out of three times, the ICS will catch the engine, run rough a few seconds and then get back to a stable idle. 1 out of 10 times, the engine rpm will hardly vary as the fan comes on. I have data logged this and see nothing else unusual going on. FYI, ICS goes from 25% to 32% when the fan comes on, if the engine hasn't stalled.
I have tried setting the ISC RPM for HS fan add to 40 and it made no change.
Is it possible that something is failing in the ingnition when the voltage drops as the fan comes on?
This is a '94 with the electronics fender mounted, not on the distributor.
Thanks,
Eric
As long as the fan stays off, my car idles great. I have the idle at 800 RPM, and its stable. ICS is about 25% duty cycle.
What happens, about 7 out of 10 times, is right when the fan comes on, the engine stalls. 2 out of three times, the ICS will catch the engine, run rough a few seconds and then get back to a stable idle. 1 out of 10 times, the engine rpm will hardly vary as the fan comes on. I have data logged this and see nothing else unusual going on. FYI, ICS goes from 25% to 32% when the fan comes on, if the engine hasn't stalled.
I have tried setting the ISC RPM for HS fan add to 40 and it made no change.
Is it possible that something is failing in the ingnition when the voltage drops as the fan comes on?
This is a '94 with the electronics fender mounted, not on the distributor.
Thanks,
Eric