1996 f150 4.9 wont start
Asked by Devan Feb 10, 2023 at 09:02 AM about the 1996 Ford F-150 XL Extended Cab SB
Question type: Maintenance & Repair
changed out my pistons and rings but never messed with timing, i made sure i
have spark, fuel, and air. before it had 2 cracked pistons and was smoking but
still ran. i never messed with anything electrical and if i did i plugged it back in
after i put the head on so at this point i am lost.
3 Answers
beatupchevy answered about a year ago
Same with any no start , check for proper spark , fuel pressure , injector pulse , timing . A sensor or something else may have gone bad by pure coincidence .
If you had to remove the distributor for the repairs your ignition timing might be off. Bring the number one cylinder to top dead center and remove the distributor cap. The rotor should be pointing at the number one spark plug tower. If it's not, your ignition timing is off. Also, check your compression. If all cylinders test very low or zero the valve timing is off too. Hope that helps! Jim
So if you had broken pistons and didn’t have the block checked you just created more work. You can’t just slap in new pistons and expect it to run, you should have took the engine out, disassembled it had the block and cylinder head check and maybe the head milled then have the crankshaft at least polished if the machine shop says it was good then get the bearings and put in the new pistons that the machine shop recommended along everything else like seals, gaskets, etc.
