I'm working on a 1993 f150 302. I'm converting it from automatic to manual transmission and rebuilt the engine. The engine is now a 347 stroker with a small cam that changed the firing order to 13726548 and 205/160 aluminum heads. I'm using the factor EFI system. When I started it, it is idling at 2000 rpm's and running hot exhaust (turns headers red) in minutes and seems to be missing. I'm wondering if the injectors are firing at the right time. HELP Please?

 

I'll assume you meant a factor(y) EFI system.

If so, the injectors are batch fired and sequence is not an issue.

The factory EFI system is speed density and not very receptive to engine mods. A change to MAF would be in order. Plenty of threads on that.

Your idling issue may be a massive vacuum leak. Regardless of engine mods, you should not be idling at 2000 rpm.

If you change to a manual transmission, your ECM is not going to be happy. The 1993 transmission is likely a 4R70W or an E4OD. Both electronically shifted. Both not interchangeable. Codes will be set.

On the subject of codes, that would be the first thing you must check.

 

Yes, factory EFI.
Read threads on speed density and the cam is suppose to work with SD. I will have to double check for vacuum leak.
Do I need to change the ECM out to one for the manual trans?

 

You don"t have to swap the ECM, but without the expected AT, the check engine light will be on and/or the OD indicator will flash.

Changing the ECM to a manual, or to an older version without the electronically shifted transmission may solve that problem.

Without knowing the details of your cam, yes the factory SD system will run, but it is much more difficult to realize any real gains without some sort of external tuning. I'm thinking the extra 45 cubic inches may do more to upset the 5.0 tuning.

 

Found one of the problems, a vacuum leak at the intake gasket. You can't put a factory intake on new aluminum heads. the intake port on the new heads is 1/8" taller than the factory intake port. Would that also cause the headers and header pipe to turn cherry red after running 3or4 minutes?
Greg

 

Running lean can/will cause egt's to be very hot. A vacuum leak can cause a lean condition and high idle. How's it run with the vac leak fixed?

I'm not versed in stroked 302 engine management but I'd be surprised if a stock tune could work here. Hopefully others with stroker experience will chime in.

 

Stock 302 tuning will work with a 347 and stock heads, but you have too much air for it to compensate.

You need a wideband, fuel pressure gauge, and adjustable fuel pressure regulator at least.

Retarded timing and lean afr are likely culprits for your high egts, assuming everything else is correct (i.e. firing order).

If you have access to a 5.8 computer, I'd swap it in.

 

Hi guys;
I got it running and it sounds great finally. I got new intake gaskets and glued them up high on the head ports and they are now holding. Here is what I have done. I took a 302 and put bored it 0.30, and put a 347 stroker kit in it, a roller cam CCA-35-349-8 with 264/270 duration and .512/.512 lift, new aluminum heads with 2.05/1.60 valves and roller rockers, short headers, but stayed with the factory speed density fuel system. It is now running good and no more red hot headers. The transmission change is working fine too. Will run it more tomorrow to check for bugs.
Thanks Greg

 

I'm very skeptical that your 5.0 computer will compensate on its own for that much difference from stock, this is coming from a guy who is very familiar with speed density builds.

You need a wideband.

 

It seems to be running fine, but I will take any suggestions I can get. I'm a Chevy guy. I'm working on this for a friend.
Thanks Greg

 

It'll run fine until it leans out mid range, may even get ping as a result. Best to get a wide band with modded speed density.

 

Do you think changing to a computer from a 5.8L would make a lot of difference?
Thanks Greg

 

FYI
It runs great, the 5 speed manual works great and the cruise control even works.
Thanks for the help.
Greg

 

The fuel maps for the added displacement will likely be a lot closer. Pretty much what 89F2urd is saying. It will run fine with the stock ECM, but the SD system is notorious for not liking a lot of change. 5.8 ECM's are plentiful, it would be worth giving it a try.

If you are changing ECM's may also be worth it to lose the transmission controls you have with the stock ECM. Something pre 91 would not have the electronic OD.