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Old November 19th, 2007, 10:15 PM   #1
nate4d
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Default 97 f150 no start.....sometimes...

has a 4.6L and is a 97 with the TPS recently replaced and fuel pump recently replaced. will crank all day but wont fire sometimes. will start with a lil bit of carb-cleaner/starter fluid. only happens sometimes. sometimes cold (sitting for awhile) or sometimes after being shut off for only 5 minutes. its got me all confused. any help will be appreciated.
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Old November 19th, 2007, 10:26 PM   #2
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Check the ignition parts... I had the same problem with an entirly different make. It would crank and crank and crank, but never start. Maybe ignition coil, or something along those lines?


Just shooting out ideas.
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Old November 19th, 2007, 10:37 PM   #3
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thanx bud ill check it out.
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Old November 20th, 2007, 08:21 AM   #4
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I don't know what sensor Ford uses to reference ambient air when starting, but check out things like the IAT, MAP, or coolant temp sensor. Find out what sensor Ford uses and do some checks on it with your multi-meter.

It sounds like the PCM isn't getting the correct temp reading when you fire it up.
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Old December 17th, 2007, 01:30 AM   #5
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There is a cam position sensor in one of the heads and a crank position sensor near the harmonic balancer. If there is moisture or corrosion in the connectors, you found your problem, dont forget to check them too. Hook alligator clips on each of the prongs and pass either a chunk of iron or a magnet and watch for a needle sweep or if its digital a range sweep. Use the resistance mode (upside down horse shoe).
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