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Re: What could be the problem if it fires up but wont...
It could possibly be fuel related. Many issues can cause this to happen, including a bad fuel injector, MAF sensor etc. Is the check engine light coming on?
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'Cranking' _is_ turning over. It is cranking but not firing, but you say it is 'firing' but not running. If it fires it is running but doesn't stay running.
Pulling it in neutral backwards has no bearing, BUT 'wet grass' may. Condensation (water) may be in the ignition system. Spray all the HT Leads with WD40.
Check the exhaust sys and make sure the muffler or converter is not plugged. If so it puts back pressure on the engine and will not allow fuel in to start. Hope this helps.
First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..
If you are getting "fire at the plugs", then it is probably a fuel delivery problem. It is very common for the fuel pump to fail in these vehicles, particularly if the truck is run below 1/4 tank of fuel very long. Slide under the truck at the tank and have someone turn on the key. if you don't hear a humming noise then your pump is not running. Check fuses, fuel pump relay, and sending terminals for bad connections. Replace the pump assembly.
Sounds like a fuel problem, when was the last time the fuel filter was chg.? If that is not an issue, than a fuel pressure test is in order, It should have around 48 to 50 p.s.i.
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