So I have a 94 with 230,000 miles on it. The car is running fine, except when I have the car in park and on if I give it a little gas the RPM goes up like normal, then drops hard back down to normal RPM. Normally it would RPM up and down smooth but now it goes up fine but then drops off, does not lower RPM smooth.
The CEL came on when this problem started last week, I have tried searching but I can't find the thread, can someone please show me a link.
Thanks,
Val

 

Behind the glove box, passengerside at the bottom, there should be a BLUE 2 pin connector.
Jumper the connector with a paper clip and then turn on the key; watch the CEL for the flash code. Long flash = 10 Short flash = 1
Here is a link for the codes;
http://hondadude.webs.com/Hnda_codesobd1.htm

 

Thanks HondaDude.

 

So I finally got around to doing this and I get 4 flashes about 2 seconds each then one half second flash.
I checked the link HondaDude posted and code 4 is the crank position sensor. Would that fit my symptoms of a hard idle drop? I will rev it up to about 4k, and at 2500 it drops flat to 1k, no smooth slow decrease, just a flat drop off..

 

Code 41 ??
Here is another link ;
http://img139.imageshack.us/img139/3...acode41no7.jpg

 

Now I am confused. Code 41?
It blinks 4 times evenly about 2 seconds each one, then on the 5th one it blink for half a second. Would this be code 41?

 

Is the "Primary oxygen sensor heater" the same as a Oxygen sensor? Is the o2 sensor something that I can clean up or do I have to replace it?

 

The 94 only has one oxygen sensor. If your car is an EX, then the sensor is on the exhaust pipe right before the catalytic converter. The LX and DX is on the exhaust manifold.

Unplug the sensor and measure the resistance on the two pins of the sensor as shown in HondaDude's post. If the resistance is out of that range, then you will have to replace the sensor.

 

So I check the resistance on the sensor's pig tail? I am going to go to a guy thats parting one out and want to check his before buying it. Sorry if this seems dumb but I am trying to learn.

 

Check the resistance on the plastic electrical connector that is attached to the sensor.