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L6-4.9L

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Question
I have a new fuel pump and there is no fuel to the engine
Hello and thank you for contacting YourMechanic. A plugged-up fuel filter will cause an engine not not start. Get a fuel pressure tester and hook it up to the fuel rail. There should be a shrader valve on the fuel...
Question
Truck runs rough in 80 to 90 degree weather
With the age of your vehicle, there are likely a few things that need to be maintained. All of the recommendations about to be made depend on what other repairs have been made recently. Since the issues are related to...
Question
Rom is running high in my truck
Hello. This is a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. Idle speed that is way too fast is one of the common signs and stalling is...
Question
I have no tail lights but all other lights work
Hey there. You should check to see if you have front parking lights. If the front parking lights work, then the rear parking lights will have bad bulbs or sockets for the bulbs. The front and rear parking lights are...
Question
Truck hesitating down the highway
With the floor board getting hot during the drive, you may want to look underneath the truck and see if the catalytic convertor is located roughly in the area where the heat is coming from. It sounds to me like...
Question
Throttle position sensor - 1994 Ford F-150
Hello. The only thing to do is to verify that the TPS was installed in the correct position. Make sure you did not put the little blade on the throttle body behind instead of in front of the sensor blades....
Question
Engine takes to long to warm up I've replaced thermostat already and it misses horrible till it warms up its a 4.9 engine
This engine uses a cooling fan clutch that controls the fan speeds on demand when the engine radiator starts to get hot if increases air flow to cool the engine down and slows the fan when it needs to increase...
Question
Whining sound when I accelerate and shift from gear to gear. 1992 Ford F150
Hello - you may be ruling out the throwout bearingthen too quickly, since your first symptoms are the noise occurs when you shift. Try taking the belt off (so that no engine-driven accessories are turning), starting the engine, then press...
Question
Rough idling and shaking very bad at low rpm's.
Hi there. Check the fuel pump relay to see if its activating. This sounds as if the fuel pump relay is having an intermittent sticking off condition. The relay may be getting too hot and shutting off causing the pump...
Question
Brakes not working and brake booster possible failure causing the engine to stall.
Hi there. If the engine tries to stall out when the brakes are applied, then look at the brake booster for any external damage. If there is no damage to be seen, then the diaphragm inside the brake booster is...
Question
Engine doesn't wanna warm up
You should have the vehicle checked to see if the engine is not running hot enough or the coolant sensor is not reading the correct temperature causing an incorrect gauge reading from the engine actual temperature. If you have already...
Question
Engine takes too long to warm up runs poor until it warms up.
There is only two possible causes of an engine running colder than it is supposed to. The fan clutch may be locked up and would cause a load on the engine and excessive airflow across the radiator not allowing the...
Question
Engine takes to long to warm up I've replaced thermostat already and it misses horrible till it warms up its a 4.9 engine
These engines are known to get real bad carbon build up on the back sides of the valves. If you engine has a hard time getting to operating temperature then it will also cause the engine to carbon up even...
Question
Need to know if I can use Bosch 4 hole injectors for my truck.
Hi there. I recommend using Bosch D3 injectors over older metal body injectors. The 4-hole spray tips atomize fuel much better than your stock injectors. The injectors have flow balancing to ensure that each cylinder gets the same amount of...
Question
Why the Fuel pump relay will not kick in using the key switch
Hello - The fuel pump power path includes the fuse, and the fuel pump relay (triggered by the ignition switch). The injectors are fired by the engine control module (PCM for Ford fans). There are 2 potentially separate issues here....
Question
Starter solenoid - 1986 Ford F-150
The starter solenoid is most likely not the problem here. You most likely have a loose or bad cable. I would first recommend using a volt meter to see if you are getting at least 12 volts on the battery...
Question
rims and tires
Hi there: In most cases, if a 4-wheel drive wheel has a similar bolt pattern, and spacing (as those numbers indicate in the 5 x 5.5), they should work on different makes and models of vehicles with similar applications. So,...
Question
My truck has trouble starting, and when it does start, it feels like it's choking or struggling to stay on.
The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can...
Question
My truck is running rough
Hello. The symptoms you are experiencing can be caused by a wide variety of issues. Problems with the fuel, ignition, or engine management systems can all cause the symptoms you are experiencing. If the symptoms only appear when driving above...
Question
Belt keeps comming off at ps pump replaced pump and tensioner
The most common cause of these belts coming off is the belt alignment is off. Using a straight edge or long ruler put it against the pulleys and see if one is out of alignment. The PS pulley may not...

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