302-351 swap major problem please help
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302-351 swap major problem please help
Last weekend we replaced the 302 in my dads 93 f150 with a rebuilt and slightly warmed over 351. Engine has a comp cams torque cam in it. Supposedly it's the largest cam you can run with speed density. It's a long story that i would rather not tell on why that cam was used. It was professionally rebuilt by the guy that builds the engines for our shop. So I have faith in the rebuild.
I used a reman ecu for a 93 with a 5.8 and e40d. I also used the correct flexplate for the application.
Symptoms, its lifeless. It idles ok but when you bring it off idle it has a dead miss all the way thru the rpm range. When it shifts into overdrive it vibrates so bad it will jar your teeth. It has a spark knock sound but it isnt spark knocking. If you pull off a plug wire one at a time it changes the way it runs so I don't think it's ignition related.
Could the ecu not be able to keep up with the cam, could it be a cracked head?
Any insight advice tips etc are greatly appreciated this is his work truck and his construction business is needin this truck on the road
Thanks in advance
Will
I used a reman ecu for a 93 with a 5.8 and e40d. I also used the correct flexplate for the application.
Symptoms, its lifeless. It idles ok but when you bring it off idle it has a dead miss all the way thru the rpm range. When it shifts into overdrive it vibrates so bad it will jar your teeth. It has a spark knock sound but it isnt spark knocking. If you pull off a plug wire one at a time it changes the way it runs so I don't think it's ignition related.
Could the ecu not be able to keep up with the cam, could it be a cracked head?
Any insight advice tips etc are greatly appreciated this is his work truck and his construction business is needin this truck on the road
Thanks in advance
Will
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Firing order has been triple checked. How do I do a vacuum test? Ibkniw there are no leaks.
Is the map sensor different from a 5.0 to a 5.8 by chance?
Please keep the ideas coming. I have to get this figured out soon.
Will
Is the map sensor different from a 5.0 to a 5.8 by chance?
Please keep the ideas coming. I have to get this figured out soon.
Will
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Timing is by the book. 10* btdc. I've checked everything I can/know to check. What else should I check?
The dead miss and vibration in od have me worried.
Thanks again for all the help, I've got to get this thing on the road for him.
Will
The dead miss and vibration in od have me worried.
Thanks again for all the help, I've got to get this thing on the road for him.
Will
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One more thing. The valves are loud especially on the drivers side. Could a lifter have died or something freak like that?
Will
Will
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Oil pressure is great on startup and then falls off from what he told me. I'm not sure how low it gets tho. I'll ask him and report back. I'm out of town until Sunday morning.
Btw. Timing is supposed to be 10* btdc right
Anything else yall can think of?
Will
Btw. Timing is supposed to be 10* btdc right
Anything else yall can think of?
Will
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From: Ottawa, Ontario
Did you change any engine bay wiring in the vehicle? You should not have.
Do you have the plugs wired for the 5.8 firing order(13726548) and not the old 5.0 firing order(15426378)?
Are you aware of the engine cylinder numbering sequence and distributor rotation? It's totally different than what Chev and Dodge use.
Do you have the plugs wired for the 5.8 firing order(13726548) and not the old 5.0 firing order(15426378)?
Are you aware of the engine cylinder numbering sequence and distributor rotation? It's totally different than what Chev and Dodge use.
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No wiring was changed. The guy i got the 351 from had tig welded the egr port shut so those arent hooked up, but everything else is the same as it was from ford in 93.
Im familiar with fords and there firing orders. With that said, I had dad check it again and its correct. As is the timing/
He said the oil pressure went to high when turned on but after it runs it falls below 0. I know it has oil pressure tho, I had it running with the drivers side valve cover off and it was pumping nicely. He will put a mechanical gauge on it this afternoon.
He said that it doesnt vibrate its smooth for the most part.
He did say that it wont pull itself up a hill (its bristol tn so hills arent that big) in od. In fact its gutless in overdrive. Altho its gutless in all gears its even more so gutless in od.
The computer was a reman I got from oreillys. The distributor is also from oreillys.
The cam was broken in to comps specs.
I will have compression numbers sometime this evening.
If you have any ideas, comments, suggestions, anything at all please post up.
Thanks again, i owe yall a beer.
Will
Im familiar with fords and there firing orders. With that said, I had dad check it again and its correct. As is the timing/
He said the oil pressure went to high when turned on but after it runs it falls below 0. I know it has oil pressure tho, I had it running with the drivers side valve cover off and it was pumping nicely. He will put a mechanical gauge on it this afternoon.
He said that it doesnt vibrate its smooth for the most part.
He did say that it wont pull itself up a hill (its bristol tn so hills arent that big) in od. In fact its gutless in overdrive. Altho its gutless in all gears its even more so gutless in od.
The computer was a reman I got from oreillys. The distributor is also from oreillys.
The cam was broken in to comps specs.
I will have compression numbers sometime this evening.
If you have any ideas, comments, suggestions, anything at all please post up.
Thanks again, i owe yall a beer.
Will
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Update
Compression numbers were as follows one cylinder had 145 one had 135 one had 110 and the rest had 125. It has about 50 miles on it now. I don't remember which cylinders had which numbers as I was driving when he called and I couldn't write it down.
Timing was checked again it's 10* with the spout unhooked.
One other symptom, it's not quick to start like it was with the 302. You have to crank it a bit before it will start.
He says it feels like it has a dead miss.
Conanski, lew and others do you have any ideas?
Thanks again
Will
Compression numbers were as follows one cylinder had 145 one had 135 one had 110 and the rest had 125. It has about 50 miles on it now. I don't remember which cylinders had which numbers as I was driving when he called and I couldn't write it down.
Timing was checked again it's 10* with the spout unhooked.
One other symptom, it's not quick to start like it was with the 302. You have to crank it a bit before it will start.
He says it feels like it has a dead miss.
Conanski, lew and others do you have any ideas?
Thanks again
Will
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From: Gridley Ks
Sounds like the timing chain is 1 tooth off. It's real easy to do, I know its a pia but if nothing else checks out check the valve timing against TDC.
BTW A friend did this and drove several 100 miles b4 I convinced him I'd screwed up.
BTW A friend did this and drove several 100 miles b4 I convinced him I'd screwed up.
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I've thought about the chain as well. It's not a thought I want to have but it's definitely a possibility. I'm just hopin against all hopes that somebody has a tip on something easy I missed or didn't think of. I know that when I set it at top dead center that both rockers on number 1 were loose.
Will
Will