real bad miss/back fire

[pelliott828]

well i have an 89 bronco ii efi 4x4 w/fm146 and i rolled it a few weeks ago. i removed the spark plugs and turned the motor over to remove the oil from the cylinders. put plugs and wires back in and it started right up. a day or 2 later it started to miss fire and back fire under heavy acceleration. iv replaced plugs, wires, coil, injectors, and tfi. any other thoughts of what it might be?

 

[BroncoJoe19]

It might be one of those Murphy's Laws, in that it might not be related to anything. Perhaps it jumped valve timing. Give her a compression check, see where you are at.

 

[Jimmy Neutron]

I second the timing issue...

I have seen these engines run 180* off, no kidding! Checking the compression would be the easiest way to check valve timing.

Let us know what solved the issue!

J

 

[pelliott828]

well i think i might have found my miss, i was looking at my motor tonight and i saw a couple plugs sparking against the block so ill get a new set sometime this week and see how that is

 

[pelliott828]

i had to adjust the timing, it was ay 4 degrees BTDC and i put it at 10, and i replaced the spark plugs and now it runs like a champ, all i need now is a new transmission and it will be just about good as new