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V8-7.5L

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Transmission won't shift and the speedometer stop
The sensor in the center of the rear axle is used for the speedometer and transmission shifting. Remove the sensor and look for excessive metal paste or chunks on the sensor which would mean the rear axle assembly may have...
Question
The high beams won't work, and when I try to turn them on, all my other lights dim bright and the motor bogs down a little
Hi, thanks for writing in. The power for the headlights run through the switch on this truck (vs using relays to get full 12v to the bulbs. So the switch, or its connector plug has probably failed and must be...
Question
Cranking no start has spark fuel 38 pulse at fuel injectors
Hi, thanks for writing in. Although you can have a "spark" (appearing on an external test), the plugs could be fouled enough to cause a no start condition, especially if you have tried repeatedly to start the engine and consequently...
Question
Press throttle hesatation press little further and smooths out somewhat
It is possible that you could have an issue with your fuel system. The engine is acting as if it is not getting enough fuel. I would recommend having a qualified technician test your fuel pressure to determine if it...
Question
Does it have a crankshaft piston sensor
There is a technical bulletin, TSB 89-24-9, for a hard start after a short heat soak. The engine control module does not control ignition timing correctly when hot and thermostat lets engine get too hot. The recommendation would be to...
Question
Battery voltage is low.
Hello. If the battery voltage reads low on the gauge then that is a sign that the charging system is not functioning correctly. If the alternator is brand new then there is little chance that it is the source of...
Question
Installed a new thermostat and now it won't hardly idle and Boggs down when driving
Hi there: Typically swapping out the thermostat only won't be the source of idle issues. However, if your 96 Ford F-250 overheated which stimulated the thermostat change, it's possible that other components may have been damaged. Some things you might...
Question
Won't run right since my son replaced the thermostat
If the engine was running without a problem before work was done then the repairs most likely have caused the problem. You should have the engine scanned and the entire engine checked for loose or disconnected connectors on the mass...
Question
Engine clicking and shaking
Hello. The symptoms you describe can be caused by a few different things. A few possibilities are an exhaust leak, or some sort of engine performance issue, such as a misfire. If the noise appears to be coming from the...
Question
My vacuum pump seems to be leaking water
Hi and thanks for contacting YourMechanic. Vacuum pumps are required to have oil in them for lubrication. If the pump is leaking water, then either the oil is the wrong type and is leaking out, or the pump has a...
Question
Engine clicking and shaking
Hello, thank you for writing in. Due to the timing being relatable to the oil change, you will want to start by double checking the repair. Make sure your oil filter was installed correctly and is allowing the oil to...
Question
Should I have a massive cooling system replacement done?
To answer your last question first, if the truck is "overheating", you can't drive it at all, not even to a repair facility. Overheating, if severe enough, has the effect of warping the cylinder heads, block, and manifolds. Even if...
Question
Electrical wiring issue with the dash lights.
Check the lights on the dash and look for the wiring. Follow the wires to where they hook up to and check that component to see if it's working. Most dash lights are hooked into the light switch and on...
Question
What are the differences between distributor types for my truck?
Hi there. In 1987 Ford used a TFI (thick film integrated) module attached to the distributor housing, where timing is computer controlled, and a Dura-spark ignition module attached to the left inner fender, where timing is still mechanically and vacuum...
Question
My car backfires at 50 mph.
Hi there. There is a timing problem with your engine. Check the vacuum advance to see if its advancing when the engine is at a higher rpm. Also check the spark plugs and wires for if they are burned but...
Question
Fast Vibration that increases with speed, and can be felt best through the steering wheel
Usually, vibration in the steering wheel is due to dynamic imbalance of the wheel/tire assembly and/or a rim is bent. Wireless chassis ears can be helpful in the diagnostic as they can pinpoint if one side, versus the other, is...
Question
Cranks won't start
The transmission fluid temperature sensor is not needed at start-up. However, if the engine coolant temperature sensor is malfunctioning that could cause hard or no starting because that temperature sensor provides an input to the PCM to enrich the mixture...
Question
How do you avoid the upper and lower A arm bushings from melting on a 1970 GS 455?
Hi there - yes, this is a very large engine, in a moderately-sized place, with lots of heat transfer issues! As you suggest, heat shields, or wrapping the exhaust manifold (headers?) with "heat wrap" to keep the heat inside the...
Question
Truck won't start from ignition
Hi there. If you're able to engage the starter directly, it's probable that your issue is either a damaged starter relay or the ignition relay. It could also be an exposed electrical wire anywhere in between these two connections that...
Question
Why is my truck is leaking transmission fluid?
Hi there. Check the location of the transmission fluid leak on the case to determine what needs replaced. There are 5 locations for the transmission to leak that are common. Locations of a leak The input shaft seal The...

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