Engine Swap Problems: 302 to 302HO
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Don't think of the injector banks as the same as the engine banks. The injectors are grouped based on firing order, and are the same batches for both firing orders - 1, 4, 5, 8, and 2, 3, 6, 7 are the two 'banks' or 'batches' of injectors. Should be exactly the same on both 351 and 302 firing orders. However, I don't know the computer logic between the two - whether the batches are fired at the same time in both the 351 computers and the 302 computers. That's why I mentioned swapping batches altogether.
Junior User
Joined: Nov 2004
Posts: 80
Likes: 0
with out knowing a bit more about your swap and what you kept on the motor from the stang and what you used frome the truck it's a bit tough!I would use the mustang ecm for a starter and if possible the mustang comuter and injector harness,did you use the mustang intake or trucks,are you running the stang mass air,post some more details ans well see if we can help! GOOD LUCK!
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New User
Joined: Dec 2004
Posts: 9
Likes: 0
The only thing on the engine from the stang would be the crank, pistons, valve train, and heads. Everything else either came off the truck (water pump, distributor, upper and lower intake, injectors, ecm, etc...) or was bought (new timing chain and harmonic balancer).
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Before you get too far down the road, did you change the gear on the distributor? There is a difference in the material between non-roller cams and roller cams, which can result in something getting chewed up - either the cam gear or the distributor gear. Have you checked for error codes in the computer yet? Have you tried setting the idle speed with the IAC unplugged? The only possible problem is that the cam is a little too big for the stock truck computer, although I don't think the stock HO cam would be that big.
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New User
Joined: Dec 2004
Posts: 9
Likes: 0
no, did not change the gear on the distributor. I was told that it wouldn't hurt anything.
no codes in the computer. I have probably driven the truck a total of about 50 miles now.
can't get the truck to start with the IAC unplugged, so I have not set the idle with it unplugged.
no codes in the computer. I have probably driven the truck a total of about 50 miles now.
can't get the truck to start with the IAC unplugged, so I have not set the idle with it unplugged.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Try to get that set (move the throttle stop screw) and then double check tps voltage at that throttle position to make sure it is under 1V. I could be mistaken about the distributor gear, but I thought it was different.
Senior User
Joined: Mar 2003
Posts: 231
Likes: 0
From: Utah
the HO cam is quite a bit bigger, and without the use of a MAF system, i dont think it will ever run right. The truck computer is programed to assume a given amount of incoming air in relationship to the tps, and now with this HO cam it needs to assume a higher amout, which means it is now running very lean. Thats where the MAF comes in, it tells the computer exactly how much air is on the way and the ecm can adjust from there! FRPP sells an add on MAF kit, or you can use the mustang ecm and maf.
and yes the two gears are different.
and yes the two gears are different.
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Posting Guru
Joined: Mar 2003
Posts: 1,349
Likes: 3
From: Cloud USA
I just did a 94 302 truck HO.. into an 87. I also just swapped the distributor from the 87. I think the haynes manual is wrong about the injector wire diagrams. I havent swapped the injectors yet, but it runs ok. The 94 harness, the injectors are fired individially.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
The '94 is a mass air truck if they are fired sequentially. Every wiring diagram I've seen has the batch fire injectors wired the same on both 302's and 351's. I have seen both harnesses in person as well, and they are both the same and match the wiring diagrams (tested with a multimeter). The only difference there is/could be is in the logic of the computer - when it commands each bank to fire in relation to the crank position.
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New User
Joined: Dec 2004
Posts: 9
Likes: 0
Thanks for all the input guys.
I finally got the truck running like a champ.
Turned out the tube running from the EGR valve to the lower intake manifold had cracked during the process. Once I replaced the tube, the truck runs great.
I've hooked up an air/fuel ratio gauge and I am running good.
EPNCSU2006, I am running the HO cam and lifters.
Thanks again,
Dan
I finally got the truck running like a champ.
Turned out the tube running from the EGR valve to the lower intake manifold had cracked during the process. Once I replaced the tube, the truck runs great.
I've hooked up an air/fuel ratio gauge and I am running good.
EPNCSU2006, I am running the HO cam and lifters.
Thanks again,
Dan
