20 Most Recent 1991 Ford F150 - Page 4 Questions & Answers

The Heater core is located behind the glove box inside the cab on the 1989 F150 and most years. Simply pull down the glove box and force the plastic wall on right side in a little to drop it all down and expose the back of the firewall. There the heater sits to be undone by pulling it out after unhooking the clips of the heater hoses on the other side, in the engine compartment. You can use these clips again perhaps but many people prefer the screwdown band clamps. Heater cores are about $65. this year of 2015. They do go out generally when the truck is over 130K miles. You will notice the smell and leak of radiator coolant inside the cab floor when they go bad. A person could bypass the two hoses inside the engine compartment firewall in front of the globe box area, with another tube pipe to clamp together and continue the flow of radiator water while have no heat or connection. However, the job is easy enough to complete in an hour or so. As far as how the heater hoses connect to the engine, you will find them going to the front side of the engine block on both sides. They do not necessarily need to be exchanged out when replacing the heater core for getting warmth back into the interior of the cab. ...Have fun, Stay warm! "A man who cuts his own firewood gets warmed twice." CA

Did you check the fuel pump pressure before and after the pumps ?You'll have to figureout if it is a fuel or ignition problem.Isthe check engine light on ?Usually a "jerking" engine is an ignition problem.You have a distributor and an ignition module that could be the problem too.

Check the fluid level

Low fuel pump pressure, Dirty air filter or weak ignition spark.

Fuel filter, fuel pump, vacuum leak, loose spark plug or spark plug wore, bad timing or timing sensor, clean mass air flow sensor, bad coil, ...could be these things in this order check them

If the truck just suddenly dies on you while you are driving under normal conditions, it is most likely your electronic control module located on your distributor. It is grey and has a plug sticking into it just beneath your distributor cap on your engine. Quite easy to replace on most models, but be certain to apply the electronic grease included with the module when you get the new one..

There is no dipstick for a manual transmission on a 94 for f150. To check the fluid you will need to get under the truck and remove a check plug. The plug will be about half way up the trans case either on the left or right side. Take the plug out and put your finger in the hole. The fluid should be withing 1/2 inch of the hole. Make sure you pull the plug that is half way up the case and not the one at the bottom as that one will drain the fluid out.

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It is most likely that the injector has what is reffered to as cokeing. this causes the injector to not have a good spray pattern sort of like your shower head gets clogged with calcium . There are products on the market to help clean the injectors but remember there is no such thing as a mechanic in a can! Replacement is your best option

Rule out the easy stuff first... Does it have the correct type and amount of fluid in the transmission? There should be a dipstick you can check. After that, the problem could be with the linkage at the shifter, or the linkage at the transmission, or internal to the unit.

posible your fuel pump inertia switch located left side under dash above the brake pedal

is attach to the frame under the driver side between frame rail and front tank

hello,there could be any number of defects on your car,age ,mileage,elapsed servicing,play havoc with reliability.check the air filter element,as it could be totally clogged,and inhibiting air flow,also get the fueling side checked,to see if the appropriate amount of incremental fuel is supplied as required? post further details about your vehicle if you do have any on going issues.hope that helps, regards.

Check for fuel, if fuel is present move on to checking for spark. If this was helpful please leave good feedback

pull out the headlight knob to put the headlights on then under the dash on the switch there is a button that needs to be depressed to pull the knob out of the switch. then on the front of the dash where you removed the knob there is a nut that requires removal then the switch assembly can be removed from the dash and lowered to disconnect the electrical plug. install in reverse order.

You can check the module in your distributor if it has one

first code it's P0320 Possible causes - Faulty Ignition/Distributor engine speed sensor - Faulty Crankshaft Position sensor - Ignition/Distributor engine speed sensor harness is open or shorted - Ignition/Distributor engine speed sensor circuit poor electrical connection - Low battery charge - Faulty Engine Control Module (ECM) Read more: http://engine-codes.com/p0320_ford.html#ixzz3DcwddSlp 2- P0750 Possible causes - Low transmission fluid level - Dirty transmission fluid - Faulty shift solenoid 1 valve - Shift solenoid 1 valve harness or connectors - Shift solenoid 1 valve circuit is open or shorted Read more: http://engine-codes.com/p0750_ford.html#ixzz3DcwoXS73 3- P0120 Possible causes - Faulty Throttle Position Sensor - Throttle Position Sensor circuit is open or shorted - Throttle Position Sensor poor electrical connection Read more: http://engine-codes.com/p0120.html#ixzz3Dcx3VCPs 4- P0220 Possible causes - Throttle Position Sensor (TPS) harness is open or shorted - Throttle Position Sensor (TPS) circuit poor electrical connection - Faulty Throttle Position Sensor (TPS) - Fault Electric Throttle Control Actuator (or Throttle Body Motor) - Accelerator Pedal Position Sensor (APP) Read more: http://engine-codes.com/p0220.html#ixzz3DcxGUMl4

It is possible that the lock jaw is incorrectly positioned on its pin. See the attached image for reference:

Only use OEM O2 sensors, and I wouldn't be surprised if your Cat Converter is partially plugged and in need of replacement, as your computer reads air quality and adjusts the burn based on the reading from the O2 sensors.