I was checking my codes the other day at this one said low pulse only 4 per crank. I'm thinking opti have any of you fellas had experience with this. thanks

 

i don't know what prob was ...but my buddys 94 Z was missing REAL bad .... i scanned it for him and it had a code 16 ..... cleared code and now runs good as it did b4 .....

 

when that code sets the computer is not seeing the low resolution refference from the opti.. does the car start ok or does it seem to crank for a long time?

 

Try this
The wires from the opti have a connector about 2 feet from it. Disconnect it at that connector and probe pin A which is the red/black wire on the side going to the PCM. Don't probe the connector side that goes to the opti. With the other lead on ground, turn the key on but don't crank the engine.

(1) If the voltage is less than .5 volts DC, either the low res. wire is open or grounded. Or the PCM connection is faulty or the PCM is bad.

(2) If the voltage is greater than 6 VDC, the low res signal wire is shorted to battery voltage.

If the voltage is between 4 and 6VDC, turn key off. Reconnect the connector and disconnect it at the opti this time. Now probe that connector just as before on the red/black wire with the power on.

See (1) or (2) above as before. If the voltage is 4 to 6 volts now, you either have a faulty opti connector or the opti itself is faulty

 

slopokrodrigez: Thanks for the tip man i will give it a shot. I've been running the car with this code for nearly 6 months. The only noticable problem is how it pulls it is incosistant one time might be strong/smooth and unabrubt the other is jerky.

HBHracing: The car seems to start up just fine. (a little rough in cold weather)

Thanks for the help guys, Alan

 

Hey chevy how do you chech your codes on your 93?

 

I use a paper clip and a haynes manual and count the "ses engine Light" Go OBD 1!