1991 Ford F-150 Engine is bogging down and dying with troubl

SOLOCHOE

MEMBER
1991 FORD F-150
6 CYL
2WD
MANUAL
130,000 MILES

I've posted similar questions regarding my situation. Truck will start without problems but will bog down and die. The truck will not restart until after 10 minutes or so. I've tested with a code reader and received 111 for both KOEO & KOER. I've replaced the fuel filter, plugs, TPS, EGR valve, EGR solenoid, EGR position sensor and ECT. I basically changed all of these because while doing a self test, using a jumper wire and counting the "check egine light" flashes, I was counting wrong thinking I was getting an error code of 33 (egr valve opening not detected). After getting the code reader, I realized this was wrong. Any suggestions why I could still be having this problem? Could it be the catalytic converters causing the truck to die?

3 Replies

DAVE H

MECHANIC
13,384 POSTS

Hello. Thanks for the donation. Much appreciated

Code 111 is a sytem PASS code which means all sytems test correctly. I would try cleaning or replacing the MAF sensor ! Let me know

MASS AIRFLOW (MAF) SENSOR
MAF sensor measures flow of air entering the engine. This measurement of airflow is a reflection of engine load (throttle opening). The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. The hot wire is maintained at 392 °F (200 °C) above cold wire (ambient) temperature. Cold wire is located downstream of hot wire. As air passes through the airflow sensor, the air temperature is measured as air passes over the cold wire sensor. The ECA uses this information to control fuel delivery.

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Sunday, March 1st, 2009 AT 9:00 PM

SOLOCHOE

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4 POSTS

My truck does not have a MAF sensor. Would it be the air charge temperature sensor(ACT) located in the manifold? If so, can I use the contact cleaner on this? Also, will there be immediate results with the engine performance noticeable before the truck breaks down again?

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Monday, March 2nd, 2009 AT 12:35 AM

DAVE H

MECHANIC
13,384 POSTS

Sorry you are quite correct. Clean ACT and MAP. I have never used contact. I suppose it would be OK. I usually usally use MAF cleaner from autoparts store !

MAP Sensor
4.9L. On right side of firewall.
5.0L Engine & 5.8L. On right side of firewall.

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
Manifold pressure and temperature are used by the ECA to calculate the airflow rate. The MAP sensor responds to manifold vacuum changes due to engine load and speed changes.
The MAP sensor uses frequency to measure manifold vacuum. The MAP sensor is used as a barometric sensor for altitude compensation, updating the ECA during Key On, Engine Off (KOEO) and at Wide Open Throttle (WOT). By monitoring MAP sensor output voltage, the ECA can determine correct rate of spark advance, EGR flow and air/fuel ratio. If MAP sensor fails, the ECA will supply a fixed MAP value and use the Throttle Position Sensor (TPS) to control fuel distribution.

AIR CHARGE TEMPERATURE (ACT) SENSOR
Threaded into a cylinder runner of intake manifold, the ACT sensor provides electronic fuel injection system with mixture temperature information. The ACT sensor is used both as a density corrector for airflow calculation and to proportion cold enrichment fuel flow.

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Monday, March 2nd, 2009 AT 11:01 AM