86 emissions control problems

June 22, 2005, 08:02:59 PM

My 86 Cougar has an automatic with 3.8CFI and 67,000 miles. My car has unusual practice of just dying when driving and then not starting for awhile, sometimes hours. I replaced the TFI module which helped but problem still occurs at times. I'm testing the emissions control system in which I waiting for a 12VDC buzzer through the mail so in the mean time I tested with a VOM and got the following.

Key On Engine Off Test Codes:
1. 22 - Map sensor input out of range
2. 14 - PIP circuit failure

Engine Running:
1. 34 - defective PFE sensor

These are the codes that could be figured out. There was also other sweeps of the meter which we could not figure out.

Any ideas or suggestions ?

Thanks.

Re: 86 emissions control problems

Reply #1 – June 22, 2005, 08:24:05 PM

Update

Engine Running:
1. 34 - not defective PFE sensor instead
34 - excess exhaust back pressure

Re: 86 emissions control problems

Reply #2 – June 23, 2005, 01:52:58 PM

Key On Engine Off (KOEO) test is divided into two parts.
The first part runs tests and reports the results with codes.
The second part displays codes that were stored in memory while you were driving.

There is a 6-9 second pause after the first tests run. Then one pulse followed by another 6-9 second pause. This is the seperator pulse between the test codes and the memory codes.

I will assume (I know, makes an ass of u and me) the 22 is a memory code since it didn't show up during the engine running test.

The 14 must be a memory code because PIP pulses are generated while the engine is running.

Memory codes can be current or they could be a year old. The first step is to reset the memory codes and start fresh.
While the KOEO is running unplug the self test jumper.

Rerun KOEO to confirm memory codes are reset.

Disconnecting the battery will also reset them.

"Quote from the '84 shop manual:

CODE 14 Erratic ignition
Code 14 indicates two successive erratic profile ignition pick-up (PIP) pulses occured, resulting in a possible engine miss or stall.

Check EEC-IV and ignition systems for:
1. Loose wires/ connectors.
2. Arcing secondary ignition components (coil,cap,rotor,wires,plugs, etc.)
3. On-board transmitter (2-way radio)."

The PIP is generated by the Hall Effect emitter in the distributor and is sent to the EEC by the TFI.

Key on engine running KOER test.

You will see three pulses at the beginning. This indicates a six cylinder engine.

code 34. Your engine does not have a back pressure sensor to control EGR.
You have a vacuum operated EGR valve.
The EEC controls solinoid operated vacuum valves that control the vacuum to the EGR valve. The EGR has a position sensor (EVP) that tells the EEC how much the valve moved.

I disconnected and plugged the vacuum line to the EGR on my '84 3.8 and it gives a KOER code 34.