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Maltman
New User
Dec 10, 2016, 10:30 AM
Post #1 of 2
(1360 views)
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Problem starting truck
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I have a 1995 F250 with 87000 miles on it. About a month ago, I had trouble starting it. The engine would turn but not catch. After the fifth attempt, it started. Truck ran well for a week and started normally. Then the same thing happened and this time it took 10 or so attempts to start it. Took the truck to me mechanic and truck started fine for him and he could not find a problem. Truck ran and started well for a week then the problem returned. This time took 20 or more attempts before it would start. Problem has not occurred on first start in the morning. Nor has it occurred when truck is re-started a few minutes after being turned off. Please help. Mechanic is stumped and I need my truck to run!
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 10, 2016, 11:07 AM
Post #2 of 2
(1353 views)
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Re: Problem starting truck
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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