Thread: Engine Codes OBD1 Cable 1993 Chevy

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yea it just killed it. Correct, No vac advance.

Originally posted by canibalchicken
yea it just killed it. Correct, No vac advance.

what codes do you have now?

The codes it is reading now is, 33 35 & 67.

ill take this info. tomorrow and see what i can come up with. if the motor is not missing the lifters is not the problem. the motor is not missing is it?

the scanner you have will it give the sensor read out or just the codes?

The scanner is for a OBD-II, different plugs , I burrowed it from my buddy. So no good.

I just found a new wire. It comes from the main harness to the coil with the coil wires. It was under some tape. It is white with a single connection. Have no idea what this wire is or where it goes.

No no missing. All good there

Just found something. I cleared all the codes and started it. The timing was about say 17 deg btdc. I have a bad injector. One is nice and pretty and the other is a steady drip.

Originally posted by canibalchicken
Just found something. I cleared all the codes and started it. The timing was about say 17 deg btdc. I have a bad injector. One is nice and pretty and the other is a steady drip.

the white wire is the tech. wire. need to get that inj. fixed and ill check this other stuff. what do you mean 1 is spraying and the other is dripping?

The fuel was just dripping out of one injector did not have any spray to it. I pulled the neg battery cable. Changed the injector. Tried to get a hole new throttle body but it would be a couple of days. Started it, The spray on both look the same. Timing was about 17. Ran better for a few min the got the code 33 and 67.

Originally posted by canibalchicken
The fuel was just dripping out of one injector did not have any spray to it. I pulled the neg battery cable. Changed the injector. Tried to get a hole new throttle body but it would be a couple of days. Started it, The spray on both look the same. Timing was about 17. Ran better for a few min the got the code 33 and 67.

is the inj. still dripping?

nope it has a nice spray, looks good. Made it run a little better too.

code 33 MAP sensor signal voltage was too high (low vacuum) for 1 second when throttle opening was under 3% and engine speed was above 500 RPM.

i think the motor is setting that code because its runing so bad.

i just checked the p vin 5.7 and 35 is not a code, but it gone anyway right.

code 67 is the ac and i think again its setting that code when the motor is about to cut off and dont make no dif right now.



92-93 5.7L VIN P
13 Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds. Engine was at normal operating temperature and had been running for at least 2 minutes after start with a throttle angle above 5%.
14 Coolant temperature sensor signal indicates a temperature of over 266? F.
15 Coolant temperature sensor signal indicates a temperature colder than -56? F.
16 A low resolution pulse was not detected by ECM within 720 high resolution timing pulses.
21 TPS voltage was above 2.5 volts for 3 seconds when the engine was running, or when the TPS was above 4.8 volts at any time.
22 TPS voltage was under 0.23 volts when the engine was running.
23 Inlet air temperature sensor signal showed an air temperature below -31? F for 60 seconds after the engine has been running for 4 minutes.
24 Vehicle speed was 0 MPH when engine speed was between 900 and 3000 RPM and throttle position angle was less than 2% for 5 seconds.
25 Inlet air temperature sensor signal showed an air temperature over 302? F for 12 seconds after the engine has been running for 4 minutes.
26 ECM detected the wrong potential voltage at the #1 quad-driver module circuit for 20 seconds.
27 ECM detected the wrong potential voltage at the #2 quad-driver module circuit for 3 seconds.
28 ECM detected the wrong potential voltage at the #3 quad-driver module circuit for 3 seconds.
32 EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of the exhaust gas.
33 MAP sensor signal voltage was too high (low vacuum) for 1 second when throttle opening was under 3% and engine speed was above 500 RPM.
34 MAP sensor signal voltage was too low (high vacuum) when engine speed was under 700 RPM, or when TPS was greater than 20% with an engine speed above 700 RPM.
36 ECM detected less than 60 high resolution timing pulses between each low resolution pulse for 5 consecutive cycles.
41 EST circuit voltage was above 4.6 volts when engine speed was under 1500 RPM.
42 The EST circuit voltage was below 0.5 volts when engine speed was below 3000 RPM.
43 One or both of the knock sensors were either open or grounded for 5 seconds.
44 Left oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation.
45 Left oxygen sensor voltage was over 0.7 volts for 50 seconds when the throttle angle was above 4% during closed loop operation.
51 PROM error.
52 Engine oil temperature was below -31? F after engine had been running for 30 minutes.
53 ECM detected a battery voltage either above 17.1 volts or below 8 volts.
55 ECM detected a lean oxygen sensor voltage for 3 seconds during the power enrichment modes of operation.
62 Engine oil temperature sensor indicated an oil temperature above 284? F after engine had been running for 30 minutes.
63 Right oxygen sensor was open showing a steady voltage between 0.35 and 0.55 volts for 60 seconds after the engine had been running for at least 2 minutes.
64 Right oxygen sensor voltage was below 0.2 volts for 50 seconds of closed loop operation.
65 Right oxygen sensor voltage was above 0.7 volts for 50 seconds of closed loop operation when the throttle angle was above 4%.
66 A/C pressure sensor circuit was either open or shorted showing a voltage below 0.12 volts or above 4.86 volts for 10 seconds.
67 ECM did not detect an A/C system pressure change of more than 9 psi when A/C clutch was engaged.
68 ECM detects voltage on the A/C status line for more than 20 seconds after ECM has disengaged the A/C relay.
69 ECM did not detect any voltage on A/C status line for 20 seconds after ECM had commanded A/C ON.
72 2nd or 3rd gear switch was open for 1.5 seconds when vehicle speed was above 30 MPH with engine speed greater than 5000 RPM and a throttle

i found the codes and the vin p means is a 1993 TBI when the light came back on did the inj change, did it run worse or the same.

the last time the light came on it died pretty quick.

so once I get the timing right I should be ok?

the 35 is not there anymore.