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Old 08-29-2012, 06:28 PM   #1
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Default 1998 Ford F150 Won't Start

The motor turns over just find and the fuel pump works just find but there is no spark. It worked find the day before but when I went out to start it the next day, it only turns over but doesnt fire. I put on a timing light and no spark shows up. Has manual transmission and 4.6 V8. I have eliminated the following as problems

PCM

Coils

please help
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Old 08-30-2012, 03:24 PM   #2
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Default Ford F150 repair update

I am changing out the Crankshaft position sensor and the camshaft position sensor today. the crank sensor connections looked real bad and I couldn't get the connector off the sensor so I ordered a new one. It will be in tomorrow. A lot has changed since I worked on Chevys and Fords with points, condensor, coil and distributer cap and rotor that turned by the engine. As I start to learn a little about this electronic distributor I am starting to see where the problems might occur. One thing is still the same as when I first started working on my 1959 Chevrolet back in 1964. You still need spark and fuel to make it work.
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Old 08-31-2012, 10:37 PM   #3
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Default Got er fixed

After changing the crankshaft sensor it started right up. Also replaced the plugs, new fan belt, new electrical connector at crankshaft sensor, and replace the heater hoses. Those heater hoses were leaking a small amount of anti freeze that was going into the spark plug socket and causing the number 8 plug to foul. Also, when I changed the spark plugs I cleaned the spark plug sockets in the head to get rid of a lot of oil and debris that had accumulated over the years. I used a combination of WD 40 in the sockets, a cleaning brush and rod for my 12 gauge to brush out the debris, rags wrapped around the brush to clean the debris, and a shop vac. I was able to get most of the debris removed and only a little got into the cylinders. I torqued the plugs to 21 ft pounds and they should stay that way for the remaining life of the truck. Also put electrical grease on all the plug wire end to make sure I keep a good electrical connection.

As a final repair, I was missing the weather strip between the cowling and the hood. As a result, dirt, leaves, and of course, water easily got into my engine compartment and made a big mess of my engine. My local truck salvage yard sold me a weather strip from a similar F150 for $10 and I have solved my problem. This also makes the truck a little quieter in the cab.

The bottom line is the truck runs like a new one even though it has 152,000 miles on it. I'm now thinking I should have it painted. I could then buy me a camper trailer and stay in camp grounds as my bride and me travel around the country in our retirement.

PS I also changed the speed control to fix the problem of going faster than the speed indicated by the speedometer. It seems to have fixed the problem but I have not had an accurate recheck against my GPS to make sure. The new speed control was only $21 at Autozone and only took me about a half hour to change.
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Old 08-31-2012, 10:37 PM
 
 
 
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