New Engine
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Tuned
Joined: Feb 2013
Posts: 258
Likes: 0
From: Peterstown
New Engine
Just installed a new rebuilt engine in my 1995 F150. I purchased the engine from an Automotive Machine Shop up in Maine. It's only firing on 4 cylinders. I'm going to do a compression test in the morning. The cylinders that are missing are 3754. The engine is firing 2 cylinders then skipping 2 cylinders. Fires 1, no fire on 37, fire 26, no fire 54, fires 8. I am getting spark to all 8 cylinders. Any ideas or opinions before I dig into it in the morning?
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Have you been in contact with the machine shop? They will probably have some suggestions since they will have to provide warranty service otherwise at some point. Was it a long block aka "crate motor" with all the trimmings?
Make sure too you've followed carefully all of their requirements to be eligible for warranty service. For example, while this doesn't apply in your case, new water pump and radiator, things like that. Otherwise they might say "too bad so sad".
Make sure too you've followed carefully all of their requirements to be eligible for warranty service. For example, while this doesn't apply in your case, new water pump and radiator, things like that. Otherwise they might say "too bad so sad".
Thread Starter
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Tuned
Joined: Feb 2013
Posts: 258
Likes: 0
From: Peterstown
Have you been in contact with the machine shop? They will probably have some suggestions since they will have to provide warranty service otherwise at some point. Was it a long block aka "crate motor" with all the trimmings?
Make sure too you've followed carefully all of their requirements to be eligible for warranty service. For example, while this doesn't apply in your case, new water pump and radiator, things like that. Otherwise they might say "too bad so sad".
Make sure too you've followed carefully all of their requirements to be eligible for warranty service. For example, while this doesn't apply in your case, new water pump and radiator, things like that. Otherwise they might say "too bad so sad".
Thread Starter
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Tuned
Joined: Feb 2013
Posts: 258
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From: Peterstown
It is MAF. I did the engine swap myself. I am a mechanic by trade. I was a mechanic in the military, and I worked for Chrysler for 5 years. Only new wires are the spark plug wires. Engine wire harness is all original. I did put a new coil on it.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
OK good info there. Was the reman engine supposed to be a direct replacement for a '95? Have you tried the old 302 firing order on the plugs? If the motor has a cam with the old firing order in it it still won't run correctly with the spark plugs revised because the injectors are fired sequentially too, but it may run a bit better and then you will know. You then have to decide what action you want to take to fix it.
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Tuned
Joined: Feb 2013
Posts: 258
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From: Peterstown
OK good info there. Was the reman engine supposed to be a direct replacement for a '95? Have you tried the old 302 firing order on the plugs? If the motor has a cam with the old firing order in it it still won't run correctly with the spark plugs revised because the injectors are fired sequentially too, but it may run a bit better and then you will know. You then have to decide what action you want to take to fix it.
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Tuned
Joined: Feb 2013
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From: Peterstown
OK good info there. Was the reman engine supposed to be a direct replacement for a '95? Have you tried the old 302 firing order on the plugs? If the motor has a cam with the old firing order in it it still won't run correctly with the spark plugs revised because the injectors are fired sequentially too, but it may run a bit better and then you will know. You then have to decide what action you want to take to fix it.
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Thread Starter
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Tuned
Joined: Feb 2013
Posts: 258
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From: Peterstown
So basically, through all this homework last night, the conclusion is, I have a MAF truck with a SD engine. So now, how do I make the SD engine work in my truck? Am I going to have to buy a different computer?
More Turbo
Joined: Mar 2003
Posts: 665
Likes: 6
From: Detroit suburb
Did you check timing with spout connector taken off ? I would first be focusing on the timing then go to the next step of SD vs MAF. Factory base setting is probably 10 degrees, most guys here go to 12 to 14 and listen for pinging, then back it off. Actually MAF is the better system so once you get it running right you'll be happier. With MAF you could go with a bigger cam for better performance. I have the opposite problem at the moment ....
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Tuned
Joined: Feb 2013
Posts: 258
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From: Peterstown
Did you check timing with spout connector taken off ? I would first be focusing on the timing then go to the next step of SD vs MAF. Factory base setting is probably 10 degrees, most guys here go to 12 to 14 and listen for pinging, then back it off. Actually MAF is the better system so once you get it running right you'll be happier. With MAF you could go with a bigger cam for better performance. I have the opposite problem at the moment ....
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Yes, by not removing/pulling the SPOUT connector, you can't set base timing and the PCM continues to adjust.
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Tuned
Joined: Feb 2013
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From: Peterstown
Logistics Pro
Joined: Aug 2010
Posts: 3,718
Likes: 586
From: Chillicothe
It may be that the cam is too radical for fuel injection, even MAF systems have limits with a stock computer. If you have a vacuum gage, take a reading at idle. It should be at least 14 inches I believe. Get much lower and things can get thrown off, idle will surge etc. I've seen a stock truck computer run with an e303 cam , but it didn't like it.
Also thank you for your service.
Also thank you for your service.