Thread: Engine Codes OBD1 Cable 1993 Chevy

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I jumpered the A & B terminal to get the service engine light to flash. I got

1 2
1 2
1 2
3 3 3 3
3 3 3 5
3 5 3 5
6 7 6 7
6 7


Can anybody look these up and tell me what each means?
Thanks a bunch

Originally posted by canibalchicken
I jumpered the A & B terminal to get the service engine light to flash. I got

1 2
1 2
1 2
3 3 3 3
3 3 3 5
3 5 3 5
6 7 6 7
6 7


Can anybody look these up and tell me what each means?
Thanks a bunch

Ok, each code will flash 3 times:
12, 12, 12= simply means there is no tach (rpm) signal. That's normal because you have the key on, and the engine isn't running.

33, 33, 33=That means MAP (mainfold Absolute Pressure) [no vac, engine not running] MAP sensor voltage high. No vac, voltage would be high (5.0 volts).

35, 35, 35= (This may be your baby !) Idle Speed / Idle Air Control Error

67, 67, 67=A/C Clutch Circuit or A/C Pressure Sensor / Circuit Fault

You want to check all your connections, then clear codes, and start the engine again to see what codes will set. You do this until you fix each one.
Oh, key off, disconnect the Neg battery cable for at least 10 seconds.

does the motor run good canibalchicken ?

Cool deal. I reset everything and all the same codes came back up. That 35, that's the idal air control motor, right.

Thanks

o yea the motor runs good at 2000 rpm's in park. It will idle to 500 but it's ruff. I still need to tweek the valves a little.

Originally posted by canibalchicken
Cool deal. I reset everything and all the same codes came back up. That 35, that's the idal air control motor, right.

Thanks

Yes. Heres a little something to try. Key off, unplug it. Unscrew it from the throttle body. Now, hold the body part with one hand. With the other, pull on the pintle with a steady pressure. It should come out. You don't have to remove it. The idea is to move it. Then, run it almost all the way in. Re install it. Pay close attention now when you start it. The idle will be high. The computer should see it right away, and turn the idle down. If it doesn't, then shut it off, and get a new one, but make sure you have voltage there at the connector.

check for a vac leak also that could cause the idle problem and make the map read wrong.

Yep checked for vac leaks. Not to many vac lines on this one. Only 4 plus the brake booster. It's got 166k on the map sensor so it's probably about time.

Originally posted by canibalchicken
Yep checked for vac leaks. Not to many vac lines on this one. Only 4 plus the brake booster. It's got 166k on the map sensor so it's probably about time.

when you pluged the dist back up the timing picked up on it right.?

Hum no that I thank about it I need to go back and re check it. It was firing at 5 deg btdc at like 2000 rpm's.

Originally posted by canibalchicken
Hum no that I thank about it I need to go back and re check it. It was firing at 5 deg btdc at like 2000 rpm's.

thats the problem then, it should have been all over the place from 20 to 45 degrees. sounds like its not pluged in.

OK I changed the map sensor and the idle air control motor. It cleared the codes. I still have the code 67. at idle 400 rpm's the timing is moving between 5 deg btdc and tdc. When I rev it up it goes beond the marker btdc. All good. I started adjusting the valves on the driver side. I have one rocker that is shooting a stream of oil out and others just ozzing out. a few are not getting any oil. What do I need to do about that?

ok canibalchicken i should have did this in the first place, but ive told you all wrong on this timing, i had to look it up, but on this motor the timing wire is a 1 wire lead over next to the dist. thats tan/ black strip. unplug it, set the time on 0 degree and then plug it back up. should make it better. let me know.

ok I don't have a 1 tan wire with a black strip. ?? I have one plug that has 4 wires going from the main harness to the distrubitor, 2 wires going from distributor to coil, and 2 wires going from coil to main harness.

Originally posted by canibalchicken
ok I don't have a 1 tan wire with a black strip. ?? I have one plug that has 4 wires going from the main harness to the distrubitor, 2 wires going from distributor to coil, and 2 wires going from coil to main harness.

is that the dist. that goes with that truck?