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Just had engine rebuilt and did the run in. Everything is running well except….
When I put the timing light to it to fine tune it, it is jumping around a little. Supposed to be 10 degrees btdc, I can get it fairly close, but it’s fluctuating back and forth 2-3 degrees. It’s a brand new timing light… Not the nicest one… $30 from harbor freight.
I cleaned fuel injectors before installing. New fuel filter. New cap, rotor, spark plugs, and spark wires. Used old distributor, but it passed the visual inspection. (teeth looked ok, and there’s no play where there’s not supposed to be). Everything else in ignition system is the old parts too.
Everything else seems to be functioning well. I’m assuming this is a problem in the ignition system somewhere, but I’m kind of lost on where to go from here.
Anyone have any ideas?
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Oh and before someone asks… Yes I went through the correct procedure recommended by ford.
Warmed up engine, pulled the electrical connector thingy (I assume this is for advance). Put in neutral. Blah blah blah
when your checking the timing and its jumping.is the spout
connector in or out? timing gear marks are 6-12 o’clock?
when the marks line up and the engine is at tdc. does the rotor
line up to #1 on the distributor? If your doing the procedure
correct and all the above is correct.can you barrow a different
timing light? If it looks like its jumping and the truck runs right
then I would leave it.unless an issue occurs. last thing.is the
distributor locked down?http://www.f150online.com/forums/v8-engines/369388-95-ford-302-timing-procedure.html
[quote=”college man” post=47076]when your checking the timing and its jumping.is the spout
connector in or out? timing gear marks are 6-12 o’clock?
when the marks line up and the engine is at tdc. does the rotor
line up to #1 on the distributor? If your doing the procedure
correct and all the above is correct.can you barrow a different
timing light? If it looks like its jumping and the truck runs right
then I would leave it.unless an issue occurs. last thing.is the
distributor locked down?http://www.f150online.com/forums/v8-engines/369388-95-ford-302-timing-procedure.html%5B/quote%5D
Sorry it took so long to reply. Been under the weather all weekend…
Spout connector is unplugged while setting timing. Yes at tdc it’s pointed to spark #1. Distributor locked down (had it just loose enough to turn it at first but checked again after tightening and getting same result). I’ve tried asking around, can’t find anyone to borrow another timing light from. The only question I didn’t understand is about timing gear marks at 6-12 o’clock… U mean the actual timing gear where timing chain is? Or on the harmonic balancer? (on the balancer I lined it up to 10 degrees btdc when I found compression stroke). As far as the timing gear goes… I had machine shop rebuild engine for me and they set the timing chain up (and were supposed to set timing).
[quote=”Cowboykevin051″ post=47060]Just had engine rebuilt and did the run in. Everything is running well except….
When I put the timing light to it to fine tune it, it is jumping around a little. Supposed to be 10 degrees btdc, I can get it fairly close, but it’s fluctuating back and forth 2-3 degrees. It’s a brand new timing light… Not the nicest one… $30 from harbor freight.
I cleaned fuel injectors before installing. New fuel filter. New cap, rotor, spark plugs, and spark wires. Used old distributor, but it passed the visual inspection. (teeth looked ok, and there’s no play where there’s not supposed to be). Everything else in ignition system is the old parts too.
Everything else seems to be functioning well. I’m assuming this is a problem in the ignition system somewhere, but I’m kind of lost on where to go from here.
Anyone have any ideas?[/quote]
As the timing gears/chain are new, I’d test the old distributor. Even though it passed a visual, if it had a lot of miles it may be worn enough to jump just a bit. Check to see if there’s someplace local that has a tester for it.
Sounds like you did everything right. If you used the old distributor this could be the cause as pointed out. Another possibility is that it’s normal. 2-3º doesn’t sound like much fluctuation but I really couldn’t say. Come to think of it it could also be that the primary ignition isn’t firing consistently. This video might help with that.
Im with mopar on this one. Could the dizzy or dizy shaft be bent.
Iv got a 93 ford f150 and it would never time right at 10… I fought with it for mouths and gave up about a year later i upgraded the cam and when i checked the timing the issue had stopped. I believe the issue was with the cam but not sure what.I would bump the timing.. They preform better bumped anyway.
Here you go my friend – my write up on the f150s 5.0
http://fullsizebronco.com/forum/showthread.php?t=63592&highlight=timing+bump
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