4 months ago did a motor swap from d16z6 Sohc vtec to b18c1 swap. Kept the original harness in the car but just used the motor harness on the b18. I get a check engine light once the car gets to optimum temp. I can shut the car off and start it immediately and the light is off until I drive maybe a 1/4 miles at optimum temp. Ive replaced the iac sensor as the code says iac sensor but doesn't cha.ge anything. BUT when I first did the swap I kept my p28 ecu connected til I could buy the correct one for the motor. When this light came.on is when I bought a p72 and connected is when I get this light all the time. I've tried disconnecting battery and everything it.will not go away. Any suggestions?

 

There is no code 24. Can you post a video of the flashes?

 

2 long blinks followed by 4 short.

 

Do you have a code reader on hand? Man, that thing is really helpful when you have a CEL on. If you don't, you should invest in one. It's not that expensive.

 

this may have to do with one of your coolant sensors... ECT..THERM fan.. i had this same problem a few months ago in my b16 coupe and it was the ECT sensor. cheap fix

 

Sounds like he has OBD1 which doesn't use the code reader hookup. Post a video of the blinks. My guess is that its code 10 and 14

 

im stupid

 

Sorry I haven't reposted, I'll do the code thing tonight. But yeah I have obd1, and also @ d15 hatch with this problem did it make your car burn more fuel as well with this light on? I understand type r tranny shorter gears and stuff but my god I don't ever get on this thing I drive like a granny actually.to save gas but 200 miles on a full tank?!?!?!?!

 

 

how do you upload videos on this thing?

 

Upload video to a site like YouTube and then post the link.

 

http://youtu.be/3WQQ9uC8XCk

 

Code 23 for knock sensor

 

where is that located on a 94 GSR?

 

Back of block

1-wire sensor

 

ok appreciate it... Any reason to why with the p28 ecu didnt give a code until i switched to the p72?

 

The p28 doesn't look for a knock sensor

 

oh, hmm makes me wonder if this thing is even bad. Ill try replacing it next weekend but thanks for your help.

 

Is it even connected and ran to the ecu?

 

The stock harness won't have a provision for a knock sensor, you would have had to run the wire to the ecu. If you didn't run the wire, there's your problem.