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Truck Won't Start...Help!!
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LadyMechanic_88
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Dec 23, 2006, 5:05 PM
Post #1 of 9
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Truck Won't Start...Help!!
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I have a 1997 Ford F-150 XLT and it just won't start. I have done a spark test, fuel pressure test, checked all the sensors and the engine won't start. It cranks over smoothly so it's not a timing problem. I did a noid light test on the injectors and they didn't light. Could this be it or is there something I'm overlooking. Please Help!!!
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steve01832
Veteran
Dec 23, 2006, 6:10 PM
Post #2 of 9
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Re: Truck Won't Start...Help!!
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When you crank the engine over the noid light should flash. If it flashes the injector pulse is ok. If the light does not flash check to make sure there is battery power at the injector harness. If there is power, check for spark. If there is no spark and no injector pulse, suspect there is no tach signal at PCM.
Steve
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LadyMechanic_88
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Dec 25, 2006, 6:22 PM
Post #3 of 9
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Re: Truck Won't Start...Help!!
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Could you possibly further explain why I am not getting a tach signal at the PCM? I am still in school and have not learned everything I need to know. Sorry if this inconviences you. But the help is much appreciated. Thanks and Merry Christmas!!!
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steve01832
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Dec 26, 2006, 3:51 AM
Post #4 of 9
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Re: Truck Won't Start...Help!!
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Before we jump to confusions, did you perform the tests I mentioned in the last post? We can only conclude there is no tach signal if there is power at the injectors, power to the coil, the injectors are not pulsing and the coil is not firing. The tach signal would either be a crank sensor on a DIS vehicle or a pickup on a distributor vehicle. Do the tests, post the results, and tell us what engine is in the truck. That would help immensely.
Steve
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LadyMechanic_88
User
Dec 26, 2006, 6:28 AM
Post #5 of 9
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Re: Truck Won't Start...Help!!
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Okay. I re-did the spark test on a different plugs. I found this time that these plugs were only sending a small spark, so I will be replacing them. There is power going to the injector harness, but there is no pulse at the injector. As I previously said the cranksensor checked out fine. What is a DIS and pickup on a distributor? The engine is a 4.6L. Hope this helps you help me. Thanks.
Sarah
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way2old
Veteran
/ Moderator
Dec 26, 2006, 4:09 PM
Post #6 of 9
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Re: Truck Won't Start...Help!!
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Have you checked all the fuses with a test light? Under the hood and under the dash. A blown fuse can cause your problem.
Being way2old is why I need help from younger minds
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LadyMechanic_88
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Dec 26, 2006, 5:53 PM
Post #7 of 9
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Re: Truck Won't Start...Help!!
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I have checked every single fuse in the truck and under the hood. But I still can't determine what is wrong. Can you help me, please?
Sarah
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way2old
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/ Moderator
Dec 26, 2006, 7:04 PM
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Re: Truck Won't Start...Help!!
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Hello Sarah. Would you please post the fuel pressure readings? Also any other readings you may have. The more information we have, the better we can assist you. You have to remember, you need to be our eyes, ears, and hands on this truck. Can you give us a little history on the truck? Any recent repirs, any funny acting things, noises, or anything that you may remember about it. What did the truck do when it died and wouldn't restart? Sorry about the questions, but to repair it, we need all the information you can give us. May take a little longer, but probably be cheaper.
Being way2old is why I need help from younger minds
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LadyMechanic_88
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Dec 27, 2006, 3:30 PM
Post #9 of 9
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Re: Truck Won't Start...Help!!
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Well the latest news is that my mother couldn't wait any longer for me to fix it so she sent it to a repair shop. Apperently the problem was a fuel injection sensor. I didn't even know there was a fuel injection sensor. But I appreciate the help on the truck, but I need help on another vehicle. I have a Chevy Astro Mark III and it keeps making this whining noise. I have checked the power steering and that's not it. I just changed the transmission filter because a neighbor who is a retired mechanic said that was it. That didn't fix the noise. Can you give me some advice as to what this noise could be.
Sarah
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