Originally Posted by KnuckleDragger

I had 3 wires that broke out of the harness, and went to the driver side head. nothing on the passenger side. I ran 2 brand new ground straps from the firewall to each head. Cleaned/roughed-up all contacts to ground.

When I first turn the key to start - the SES light does the "bounce" and remains on til the car is started. It then turns off - but comes right back on after about 5 seconds.

If I shut off the car, then turn key to on again - the SES light just remains lit. No bounce.

Originally Posted by george88gta

first try removing your chip and make sure its seated correctly .its easy to check and will cause problems

Originally Posted by george88gta

Try replacing the part where wires connect to distributer ( can't think of the correct name... It sits on the cap.

Originally Posted by george88gta

Try replacing the part where wires connect to distributor ( can't think of the correct name... It sits on the cap.

Originally Posted by george88gta

Yes. It was a solution to some of my problems

Originally Posted by KnuckleDragger

Installed a reman ECU (77-7165), with my same PROM. Car fired right up - sounds great. SES light immediately lit up.
Drove it about 10 miles, and checked the trouble codes at O'Reilly's Auto Parts. This is what it's throwing now:
46 -

45 -

CIRCUIT DESCRIPTION:

The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F). An open sensor circuit or cold sensor causes "Open Loop" operation.

NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Code 45 is set when the O2 sensor signal voltage on CKT 412:

•  
  • Remains above 0.7 volt for 50 seconds; and in "Closed Loop".
  • Engine time after start is 1 minute or more.
  • Throttle angle greater than 2% (about 0.2 volt above idle voltage)

DIAGNOSTIC AIDS:

• Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 45 may have been set. If the conditions for Code 45 exists, The block learn values will be around 115.
• Fuel Pressure. System will go rich if pressure is too high. The ECM can compensate for some increase, However, if it gets too high, a Code 45 may be set. See CHART A-7.
• Rich injector. Perform injector balance test CHART C-2A .
• Leaking injector. See CHART A-7.
• Check for fuel contaminated oil.
• High Energy Ignition (HEI) Shielding, An open ground CKT 453 (ignition system reference signal low) may result in EMI, or induced electrical "noise". The ECM looks at this "noise" as reference pulses. The additional pulses result in a higher than actual engine speed signal. The ECM then delivers too much fuel, causing system to go rich. Engine tachometer will also show higher than actual engine speed, which can help in diagnosing this problem.
• Canister purge. Check for fuel saturation. If full of fuel, check canister control and hoses.
• MAF Sensor. An output that causes the ECM to sense a higher than normal airflow can cause the system to go rich. Disconnecting the MAF sensor will allow the ECM to set a fixed value for the sensor. Substitute a different MAF sensor if the the rich condition is gone while the sensor is disconnected.
• Check for leaking fuel pressure regulator diaphragm by checking vacuum line to regulator for fuel.
• Throttle Position Sensor (TPS). An intermittent TPS output will cause the system to go rich, due to a false indication of the engine accelerating.

44 -

CIRCUIT DESCRIPTION:

The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F) An open sensor circuit or cold sensor causes "Open Loop" operation.

NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Code 44 is set when the 02 sensor signal voltage on CKT 412 remains below 0.2 volt for 2O seconds and the system is operating in "Closed Loop".

DIAGNOSTIC AIDS:

• Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 44 may have been set. If the conditions for Code 44 exists the block learn values will be around 150.
• 02 Sensor Wire. Sensor pigtail may be mis-positioned and contacting the exhaust manifold. Check for intermittent ground in wire between connector and sensor.
• Mass Air Flow (MAF) Sensor. A Mass Air Flow (MAF) sensor output that causes the ECM to sense a lower than normal air flow will cause the system to go lean. Disconnect the MAF sensor and if the lean condition is gone, replace the MAF sensor.
• Lean Injector(s). Perform injector balance test CHART C-2A.
• Fuel Contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a Code 44.
• Fuel Pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm, See CHART A-7.
• Exhaust Leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor. Vacuum or crankcase leaks can cause a lean condition.
• AIR System. Be sure air is not being directed to the exhaust ports while "Closed Loop". If the block learn value goes down while squeezing air hose to left side exhaust ports, refer to CHART C-6.
• If the above are OK, it is a faulty oxygen sensor.

42 -

CIRCUIT DESCRIPTION:

When the system is running on the ignition module, that is, no voltage on the bypass line, the ignition module grounds the Electronic Spark Timing (EST) signal. The Electronic Control Module (ECM) expects to see no voltage on the EST Line during this condition. If it sees a voltage, it sets Code 42 and will not go into the EST mode. When the rpm for EST is reached (about 400 rpm), and by-pass voltage applied, the EST should no longer be grounded in the ignition module so the EST voltage should be varying. If the bypass line is open or grounded, the ignition module will not switch to EST mode so the EST voltage will be low and Code 42 will be set. If the EST line is grounded, the ignition module will switch to EST, but because the line is grounded, there will be no EST signal and a Code 42 will be set.

NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Code 42 means the ECM has seen an open or short to ground in the EST or bypass circuits. This test confirms Code 42 and that the fault causing the code is present.
2. Checks for a normal EST ground path through the ignition module. An EST CKT 423 shorted to ground will also read less than 500 ohms; however, this will be checked later.
3. As the test light voltage touches CKT 424, the module should switch causing the ohmmeter to "overrange" if the meter is in the 1000-2000 ohms position. Selecting the 10-20,000 ohms position will indicate above 5000 ohms. The important thing is that the module "switched".
4. The module did not switch and this step checks for:

•  
  • EST CKT 423 shorted to ground.
  • Bypass CKT 424 open.
  • Faulty ignition module connection or module.

1. Confirms that Code 42 is a faulty ECM and not an intermittent in CKTS 423 or 424.

DIAGNOSTIC AIDS:

The "Scan" tool does not have any ability to help diagnose a Code 42 problem. A Mem-Cal not fully seated in the ECM can result in a Code 42. Refer to TESTING PROCEDURES/DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
41 -

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.

1. The Electronic Control Module (ECM) used for this engine can also be used for other engines, and the difference is in the Mem-Cal. If a Code 41 sets, the incorrect Mem-Cal has been installed or it is faulty and it must be replaced.

DIAGNOSTIC AIDS:

• Check Mem-cal to be sure locking tabs are secure.
• Make sure the pins to the Mem-Cal and PROM are making proper contact.
• Make sure part number on the Mem-Cal is correct.
• If the Mem-Cal is defective it must be replaced.
• It is also possible that the ECM is bad, but do not replace until all of the above is checked.

63 -
61 -

So - it's the same codes as before, with the addition of 45 and 46 now.

Note: The guy I bought the car from said he was driving the car once when the battery tipped back, and the positive battery terminal contacted the inner fender. The car immediately died. After he told me that I thought: It probably screwed up the ECU... so I went ahead and replaced it. Nope. Didn't help.

What next? Try a new PROM?

Originally Posted by KnuckleDragger

Installed a reman ECU (77-7165), with my same PROM. Car fired right up - sounds great. SES light immediately lit up.
Drove it about 10 miles, and checked the trouble codes at O'Reilly's Auto Parts. This is what it's throwing now:
46 -
45 -
44 -
42 -
41 -
63 -
61 -
54 -
52 -
51 -

So - it's the same codes as before, with the addition of 45 and 46 now.

Note: The guy I bought the car from said he was driving the car once when the battery tipped back, and the positive battery terminal contacted the inner fender. The car immediately died. After he told me that I thought: It probably screwed up the ECU... so I went ahead and replaced it. Nope. Didn't help.

What next? Try a new PROM?

Originally Posted by KnuckleDragger

SERIOUSLY? What the...?
Just went out and "blinked out" the codes (paper clip/SES light) and it just goes between codes 12 and 33.
Why was O'Reilly's code reader so off? I even went to 2 different O'Reilly's.
Grr...

Originally Posted by KnuckleDragger

SERIOUSLY? What the...?
Just went out and "blinked out" the codes (paper clip/SES light) and it just goes between codes 12 and 33.
Why was O'Reilly's code reader so off? I even went to 2 different O'Reilly's.
Grr...