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-   -   I'm sorta stumped..... (http://ratrodsrule.com/forum/showthread.php?t=37864)

Bamamav 08-31-2019 08:35 PM

I'm sorta stumped.....
 
5.0 roller cam engine, had a HO fuel injection manifold and TFI distributor. Swapped to a 74 points distributor, Edelbrock Performer 289 intake with a 600 cfm Summit 4bbl carb. I was under the assumption that all roller cam motors used the 351 firing order, but have just found out apparently they don't. There were a few used in Lincoln Town Cars, Crown Vics, and Mercury Grand Marquis that used the old 289-302 firing order.

I have been trying to fire off the Lincoln all afternoon, no luck. I can make it spit out the carb or the exhaust or both, but not run. I tried the old firing order once, but must have had #1 off, it never fired. Pulling hair here!

Went back just now and looked at old dist cap and wires, sure enough I marked it before I pulled it, and IT DOES USE THE OLD 289-302 FIRING ORDER! Gonna try to rewire it again using the old order tomorrow or Monday and try it again.

I was told when we got the truck that I took the engine out of that it came from a Mustang, well, maybe the FI did, but now I'm thinking the long block came from a Town Car or Crown Vic. I love my Fords, but they sure did some weird $hit sometimes!

If going to the old firing order doesn't work, I'm totally stumped on this one.

ruggs 08-31-2019 08:57 PM

If you pull the valve covers you can start at number 1 tdc and follow the cam sequence.

Dr Crankenstein 08-31-2019 11:55 PM

Quote:

Originally Posted by Bamamav (Post 519160)
I love my Fords, but they sure did some weird $hit sometimes!

Not to mention the previous owner(s) and whatever they've done along the way. [S

Sounds like the old firing order is what you need. Let us know how it goes!

.

kenny c 09-01-2019 07:58 AM

Not sure on the firing order. I do know that if you are running a roller cam you have to change the drive gear on the distributor or it will wear out .

Sam_Fear 09-01-2019 11:37 AM

Quote:

Originally Posted by Bamamav (Post 519160)

I love my Fords, but they sure did some weird $hit sometimes!

Yep. Working on old Fords ain't for dummies.

"Just use whatever's in the other parts bin." - assembly line foreman

Bamamav 09-01-2019 07:04 PM

This damn thing is kicking my a$$.:mad: I've never had this much problem getting one started. :mad::mad::mad:

I have:

1. Used roller firing order
2.Advanced/retarded firing
3. Moved plug wires one hole each way and repeated #2

4. used old 302 firing order
5. same as #2
6. same as #3

No matter what I try, I still get it popping out the carb, sometimes in the exhaust, sometimes both. It never fires more than once or twice.

I have checked when intake on #1 closes, waited for timing mark to come up, set rotor to fire just before TDC and right at it. Changed the firing order so many times I'm afraid I'm going to wear out the dist cap. I have 12 volts at coil with ignition wire from switch and a wire from I terminal on solenoid. Points are firing as far as I know, I still need to put a plug in a wire and let the wife turn it over while I watch for spark. It has gas, see it in sight windows on carb, squirts when you mash it.

What the hell am I missing?

It's got to be something simple I'm overlooking. May be my distributor shaft is worn out not letting points open all the time, I dunno. About ready to chunk the distributor and get one of those hideous GM style HEI's.:eek:

Somebody help me before I lose what little hair I have left!

kenny c 09-01-2019 07:32 PM

Have you checked point gap? May need a condenser?[S Is there a resistor in line before the positive terminal on coil? If so try jumping it . If it is a 6 volt coil and it has been run without a resistor the coil may be on it's way out. Hope some of this may help.

Bamamav 09-01-2019 09:13 PM

Points and condenser are new, coil is used but was taken off a running 8N tractor that was 12 volt, using the resistor that was on it also. I also have a full 12 volts coming from the I terminal of the solenoid while cranking.

I have spark, at least sometimes I know I do because it will fire out the exhaust as if it's firing too late, and other times it spits out the carb as if it's firing too early, sometimes it does both. I'm still thinking the firing order is off somehow, but how, I can't figure. I'm going to pull the other valve cover in the morning and see if I can tell which cylinder should be next, 3 or 5, which should confirm the firing order.

Oh, the cap is wired counter clockwise like the diagrams I have. I mistakenly wired a 460 clockwise once, didn't take but a jiffy to figure out what I had done. This 302 has me baffled though.

Thanks for the thoughts!

Old Iron 09-01-2019 09:17 PM

Have you heard this engine run???
If not, the timing change may have jumped time.

Bamamav 09-01-2019 10:05 PM

Iron, this engine was in my late son's pickup, it was running when the trans went out and he parked it, about 12 years ago. It was EFI, I changed it to a carb and points distributor.

Going to check TDC again tomorrow and rewire it to old 302 pattern. I'm 99% sure it's going to be the old pattern as I have the cap I pulled off the EFI distributor and I numbered the wires before I pulled them, they check to be the old pattern. Maybe I'm using the wrong timing mark on the balancer, only thing I haven't rechecked.


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