Question about 1990 Ford F150

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No data from ecm

Truck runs very rich check engine light is on but can not get any data from otc

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If no comunication with the escanner ,
1 of the problem can be a bad ECM.
I have replaced lots of them for this problem.
2 can be a bad MAP sensor. or TPS sensor.
You can try to get manual codes fro this truck. Is possible OK.

Posted on Jul 03, 2008


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Posted on Jan 02, 2017


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02 f150 5.4 runs ruff after it warms up

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The engine light comes on, mechanic states that the car reads that it is running rich why

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My 1994 Cadillac Seville is running excessively rich.

I guess my first question would be, is the check engine light on ?
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What is code p1133

Circuit Description
The powertrain control module (PCM)/engine control module (ECM) constantly monitors the oxygen sensor (O2S 1) activity for 100 seconds . During the monitor period, the PCM/ECM counts the number of times that the O2S 1 switches from rich to lean and from lean to rich. With this information, a total for all switches can be determined. If the number of switches is too low, DTC P1133 will set. The lean-to-rich and the rich-to-lean are greater than 18 switches.

Conditions for Setting the DTC
  • DTCs P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0134, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P0405, P0406, P0443, P0506, P0507, P1130, P1404 and P1627 not set.
  • Engine is operating in closed loop.
  • Purge D.C. is greater than 0%
  • Engine coolant temperature (ECT) is above 72 °C (162 °F) .
  • The engine has been operating for at least 120 seconds .
  • Calculated airflow is between 9 and 42 grams/sec .
  • Canister purge duty cycle is greater than 2%.
  • Engine speed is between 1600 rpm and 4000 rpm .
  • 0 second delay after conditions are met.
  • Airflow is between 7 and 40 g/sec .
Action Taken When the DTC Sets
  • The PCM/ECM will illuminate the malfunction indicator lamp (MIL).
  • Open loop fuel control will be in effect.
  • The PCM/ECM will store conditions which were present when the DTC was set as Freeze Frame and in the Failure Records data.
  • A history DTC is stored.
  • Coolant fan turns on.
Conditions for Clearing the MIL/DTC
  • The PCM/ECM will turn the MIL off on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
  • A history DTC P1134 will clear after 80 consecutive warm-up cycles have occurred without a fault.
  • DTC P1133 can be cleared by using the scan tool CLEAR INFO function or by disconnecting the PCM/ECM battery feed.
Diagnostic Aids
DTC P1133 is most likely caused by one of the following items:
  • Fuel Pressure - The system will go rich if the fuel pressure is too high. The PCM/ECM can compensate for some increase. However, if it gets too high, a DTC P1133 may set. Refer to "Fuel System Diagnosis".
  • Leaking injector - A leaking or malfunctioning injector can cause the system to go rich.
  • Manifold Absolute Pressure (MAP) sensor - An output that causes the PCM/ECM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM/ECM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected.
  • Pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the pressure regulator.
  • Throttle Position (TP) sensor - An intermittent TP sensor output can cause the system to go rich due to a false indication of the engine accelerating.
  • O2S 1 contamination - Inspect O2S 1 for silicone contamination from fuel or improper use of RTV sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM/ECM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.

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your engine is fine. find a new mechanic.

if the exhaust clogs it just dies. your cat ( converter) probably clogged due to a very rich condition, which was detected by the computer, hence the light. my bet is a clogged fuel injector or a sensor (either oxygen or air flow) failed. this made it run rich and the cat probably melted.

get a new cat installed, have them run the codes.

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I don't know if this may be a problem? below
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