but the 137 firing order is a H.O firing order though.... idk, tomorrow i am going to turn the engine over to TDC, pull #3 CYL and #5 CYL put a screwdriver in each plug hole and see what one comes up first, that should tell me wether or not its an H.o or not, the next step should be cleaning the ten pin connectors like you said and see if that solves the problem or not. hopefully you are right and i dont have to change the injector wires around or change out the ecu. i will update this tomorrow and let you know what happens, thanks
Crank doesn't determine firing order in this case.Feeling for the piston won't do anything.
Firing order is in the cam.
All that different between the firing orders is the fact that in an HO setup
3 and 7 are in the induction stroke when 5 and 4 are one the exhaust stroke.
Nothing to do with when the piston comes up. Piston could up top, but that be the end of the exhaust stroke.
Past 94 I believe all 302's had the HO firing order. No matter what vehicle.
This doesn’t prove that the block has an HO cam. Some trucks evidently use a HO firing order
with a low lift cam. However, it will definitely prove that a cam can’t be HO because the firing order is wrong.
Remove the #1 & #3 spark plugs. Put your finger in #1 spark plug hole. Crank the engine over until you feel compression on #1 cylinder. Slowly turn the engine until the TDC mark and the timing pointer line up. Mark TDC on the balancer with chalk or paint. Put your finger in #3 spark plug hole and crank the engine 90 degrees. You should feel pressure trying to blow past your finger. If you do not feel pressure, repeat the process again. If you feel pressure, it is has a HO firing order.
No pressure the second time, remove spark plug #5. Put your finger in #1 spark plug hole. Crank the engine over until you feel compression on #1 cylinder. Put your finger in #5 spark plug hole and crank the engine 90 degrees. If you feel pressure now, the engine is not a HO model, no matter what it says on the engine.
Using a small carpenter or machinist square to mark the harmonic balancer off into 90 degree sections may be helpful here.
A 15/16 deep socket & breaker bar or ratchet may be used to turn the engine.
The HO firing order is 1-3-7-2-6-5-4-8.
Non HO firing order is 1-5-4-2-6-3-7-8
Putting the distributor back in is fairly simple. Pull #1 sparkplug, put your finger in the sparkplug hole,
crank the engine until you feel compression. Then line up the TDC mark on the balancer with the pointer
on the engine block.
The distributor starts out with the #1 plug wire lined up at about 12:00 with you facing it. Align the rotor
to about 11:00, since it will turn clockwise as it slides into place.
Align the distributor rotor up with the #1 position marked on the cap, slide the distributor down into the block,
(you may have to wiggle the rotor slightly to get the gear to engage) and then note where the rotor is pointing.
If it still lines up with #1 position on the cap, install the clamp and bolt. If not, pull it out and turn 1 tooth forwards
or backwards and try again. Put the #1 spark plug back in and tighten it down, put the clamp on the distributor,
but don't tighten it too much, as you will have to move the distributor to set the timing. Note that if it doesn't
align perfectly with #1 position, you can turn the distributor until it does. The only problem is that if you are too
far one way or the other, you can't turn the distributor enough to get the 10-14 degree optimum timing range.
10 degrees BTC is towards the drivers side marks.
Simplified diagram of what it looks like. Not all the marks are shown for ease of viewing.
ATC ' ' ' ' ' ' ' ' ' '!' ' ' ' ' ' ' ' ' ' BTC
---------------- > Direction of Rotation as viewed standing in front of the engine.
The ' is 2 degrees.
The ! is TDC
The ' is 10 degrees BTC
Set the timing 5 marks BTC. Or if you prefer, 5 marks towards the driver's side.
At this point hook up all the wires, get out the timing light and start the engine. Set the timing where your car
runs best. Don't forget to disconnect the SPOUT jumper connector when you set the timing, and plug it back
in when you finish.
The HO firing order is 1-3-7-2-6-5-4-8.
Non HO firing order is 1-5-4-2-6-3-7-8
ok, im going to figure this out one way or another.. is there anyway to look up what the firing ordre is from the ecu numbers?? heres what my ecu has written on it.........
ok, i put the engine at top dead center, pulled plug 3 and 5, and 3 came up with the compression stroke first, which according to the mustang book, the engine is an H.O. i have the a9p ecu so what firing order is it hitting the injectors with?? or is the firing order of the injectors controlled by the tfi module relaying back to the ecu telling it what injector to fire? please help!! i have to get this thing running good within the next week!!!
i got it running OK.... i think it might be a tooth out so as soon as the sun comes up tomorrow im going out there to put it back into time cause we've been screwing with it quite a bit. i called autozone and as it turns out the only motor they ever put in a 90 GT is an H.O, which just so happens to be the firing order of the engine, the engine is outta a 95 bronco as i said before but to my knowledge it isnt an H.O but ford decided to change the firing order....?? thats what i read and thats what people been telling me anyhow...... i took off the intake and found a few vaccum plugs left open so i plugged the off and put it back together, then i put cardboard in between the plug wires that were crossing and it seem to run bettter, so maybe im getting a crossfire between the wires??..
usually plugs 5 and 6 are the ones that cause a problem. Ford had a TSB about making sure the they were separated, since they fire next to each other in the sequence.