1989 4.9L 300 6- will turn over but wont fire
07-22-2014, 12:32 PM
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1989 4.9L 300 6- will turn over but wont fire
hi i have a 1989 f-150 4.9L inline 6, 5 speed . i was driving down the road [it was raining] and i was going about 50 mph and she just died. no spitting no sputtering just cut off like it ran out of gas. [it has over a half a tank] i asked my friends what it would be and they all said the coil so i replaced it and still nothing. i have full power to everything, i turn the switch over and the fuel pump engages, it will turn over but never fire. we pulled out one of the spark plugs and it still got no spark, the crank is turning. do yall have any idea what it could be. please and thank you
07-22-2014, 08:51 PM
#2
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Look for other posts about truck cranks but no fire. Forge-World-Ford posts a link on easy engine diagnosis. That will get you going in the right direction. By the sound of it, I would lean towards a PIP sensor. I bring this up a lot because I have had this problem twice. Truck shuts off like it had a kill switch? Haynes book also has some tests for it. I would recommend testing first unless money isn't a problem. I also recommend replacing the whole distributor rather then just the sensor. A new distributor is around $100 at O'Reilly's. Be careful of re-manufactured, the sensor is not always changed.
07-23-2014, 12:48 PM
#3
Distributor is a total PIFA to get apart and reassemble as the gear is pressed on...the pickup assembly is 20 the distributor is about 90. Far easier to just get a distributor.
Take the coil and the ignition module and have them tested. In my experience when the module goes it takes the coil too for some reason. I have an Advance Auto here where there is actually a manager who will take 20 minutes to dig out the right tester and test the module rather than say it cant be tested just to sell you a new one...
The TPS will stop the truck in its tracks... easy to test the voltage on it with a 5.00 digital meter.Invest $20 in a fuel pressure gauge. Connect it to the rail behind the intake and see if it comes to correct pressure with key in on position...if it does not then check fuel pump relay and ecm relay. Pull codes if you can...might be the caps in the ECM
20 year old trucks are fun huh?
Take the coil and the ignition module and have them tested. In my experience when the module goes it takes the coil too for some reason. I have an Advance Auto here where there is actually a manager who will take 20 minutes to dig out the right tester and test the module rather than say it cant be tested just to sell you a new one...
The TPS will stop the truck in its tracks... easy to test the voltage on it with a 5.00 digital meter.Invest $20 in a fuel pressure gauge. Connect it to the rail behind the intake and see if it comes to correct pressure with key in on position...if it does not then check fuel pump relay and ecm relay. Pull codes if you can...might be the caps in the ECM
20 year old trucks are fun huh?
Last edited by southernyankey1; 07-23-2014 at 12:57 PM.
