ive been working on this car for months working out the kinks. its a 90 crx with a d16a6 dpfi to mpfi when i got it. this is the only engine light i have left. This light only kicks on when the engine goes over 2k rpms. if you start it cold it goes on because it wants to idle up. let it warm up and then shut it off, pull the hazard. start it back up wamr it idles fine with no light. you can pedal the throttle to 1300 1500 1700 1900 i let it hover at 1900 and no light. 2000 to 2100 light comes one, nothing else is affected. theres also a pop in the idle maybe every 5 seconds sometimes. any input?

 

i have the exact problem. Im waiting on a new sensor for my distributor. when i change that out i will let you know if it worked. a lot of other people had the same problem. you can use the search option and get more info. it looks like people with similar problems either rebuilt their distributors or bought a new one.

 

i would check your wireing before you go buying new dizzy stuff. who wired the car for mpfi?

 

not me thats for sure. whoever it was didnt take the time to use solder and shrink wrap. im gonna check out my dis. ill keep you posted. thanks for the input, im no longer at a dead end, i have something to take apart haha.

 

THIS DUDE MIGHT BE ABLE TO HELP US

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Nope. Replacing distributor did not resolve the problem. Drove it around and code 9 came right back. Check Engine light came on as soon as it missed. So here's some usefull info for D16A1 with code 9:
The Cylinder position sensor is located at the end of exhaust camshaft, next to the distributor. Code 9 on these motors reffers to this and not the distributor. So before you replace the distributor check this sensor. All electrical connections to it, normally its the connection and not the sensor itself. In my case the connector had some fluid in it and was shorting out. While the car was idling, I was checking the CYL sensor connector (green) to make sure it was plugged in all the way. I twisted the connector, engine missed, check engine light came on. So turned the car off, cleaned the wires and the connector, took the negative off the battery to reset the ECU, started the car, no code 9. Drove the car for about 65 miles, no code 9, new distributor does make it run very smooth though.

I'm sure other people got rid of this by replacing the distributor but after much research and troubleshooting, for me it ended up being the cyl sensor.

D16A1 Code 9:
1. Check Ignition Timing
2. Check CYL sensor and related wires/connectors- located at the end of exhaust cam, next to distributor

Thanks to my new best friend 'LUCKY' at Honda delaership, he got me this info.
I'll drive it around more for a few days and post a confirmation.