Anyone else experience this? - Toyota Nation Forum : Toyota Car and Truck Forums

TyzToyz · 09-12-2011, 09:14 PM

My 90 Corolla GT-S (4AGE) really drops in RPM when the e-fan is engaged.
It has never stalled on me yet, but does drop from 900 to between 400 to 500rpm. The steering wheel shakes, and if I rev it (blip the throttle), it sometimes returns to 900rpm.
The alt is right at 14.2V, the battery is good, I have cleaned the TB, checked vacuum lines........ and just plain did a good "once over" under the hood.
Anyone else experience this? Is my e-fan just toast and drawing too much current? Is there a connector somewhere that is common to fail?
Anyone swap in an e-fan from a different make of vehichle?
Thanks for any help or suggestions,

Tye

SuperRA · 09-13-2011, 12:35 PM

My RPMs do drop too but not that much. Also the RPMs return back to near where they were before the fan turned on. I would check all the connections at fan and relay/fusebox to see if there is corrosion.

ToyotaBrendan · 09-13-2011, 12:46 PM

My e fan does not do this, but i worked on a mazda miata that did, as did my sisters mini cooper. The mazda had a slight short on the radiator core support, and badly corroded connector, the mini rats got into the wiring and was shorting against a bunch of other things causing component chaos lol.

MzKzM · 09-13-2011, 01:19 PM

There is are idle-up diodes installed in the loom under the steering wheel. One of these may be broken.
This diode raises the RPM whenever you switch on the A/C, rear window defroster, headlights, ect.
I believe this is the same for the radiator cooling fan.

The diodes are usually in a orange connector but recall to have a blue and a grey one as well.