New motor sluggish
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Elder User
Joined: Jul 2012
Posts: 769
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From: Poplar Bluff, MO
its got the 5.0 ho upper intake but the rest is stock truck 5.0... some hoses were left un touched i think theres some egr & emissions related stuff gone but other than just being sloww from a stop and not very good throttle response it ran fine
Senior User
Joined: Mar 2005
Posts: 191
Likes: 0
From: Maryland
Since it's a '96 I'm assuming it's mass air, open headers you say, so no ox sensor, correct? Without an oxy sensor the computer can't sense air fuel ratio, and can't learn any strategies to correct them, are you going to hook up your exhaust?
Did you set the ignition timing with the spout disconnected? Do you have any vacuum leaks which would be tricking the mass air? How does it idle?
Did you set the ignition timing with the spout disconnected? Do you have any vacuum leaks which would be tricking the mass air? How does it idle?
New User
Joined: Jan 2013
Posts: 3
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you really need to reconect the o2 sensor, you can also advace your base timing to about 12. but remember that you need to disconectt the spout. im not postive as to the location in your truck but my 95 f350 460. it is on the driver side wheel well. its just a grey looking lithe plug type of thing that you pull out. it disables the computer from electroically advancing the timing while you set it. be sure to put it back in after your done
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Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Agree on the O2. If it isn't hooked up, its not gonna help your situation. Even an old O2 won't help much. You can purchase a new one and its gonna do you loads of good.
Also, there is no sales tax on an O2 sensor. Its a Federal emission part.
Also, there is no sales tax on an O2 sensor. Its a Federal emission part.
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Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
If you indeed have 3 O2 sensors, I would say that there is one on each manifold and the one on behind cat. If so, and you want to completely get best mileage and horsepower, I would recommend on replacing them, if you believe they are more than several years old. I would only do it if you suspect they are not up to par. I forgot about Mass Air having several O2's. If I could afford it, I would try to change them all at once, but sometimes every $$ adds up.
Reconnect the existing O2, clear PCM/ECM memory, and then drive it to allow it to learn new strategies.
I'm a firm believer in squeezing every dollar I can from the get go and not throwing parts and $$$ at something until I have exhausted all paths of reasonable logic.
Note, I did replace all the O2 sensors on my wife's Expy and in hindsight, I would have next time checked Rockauto.com before doing it again. It would have saved my about $30. I just needed to get it done sooner or would have waited a few days.
Reconnect the existing O2, clear PCM/ECM memory, and then drive it to allow it to learn new strategies.
I'm a firm believer in squeezing every dollar I can from the get go and not throwing parts and $$$ at something until I have exhausted all paths of reasonable logic.
Note, I did replace all the O2 sensors on my wife's Expy and in hindsight, I would have next time checked Rockauto.com before doing it again. It would have saved my about $30. I just needed to get it done sooner or would have waited a few days.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
All good advice here, but if the truck was running okay before the motor swap then you have some investigating to do to make sure you did not miss something basic.
You have been vacillating on this swap for weeks. Many here having given their input to your questions. These OBD-II control systems are not as easily "fooled" like the OBD-I versions are. Granted they are easier to tune but they tend to deliver very poor performance until all the inputs are supplied or programmed out.
You have been vacillating on this swap for weeks. Many here having given their input to your questions. These OBD-II control systems are not as easily "fooled" like the OBD-I versions are. Granted they are easier to tune but they tend to deliver very poor performance until all the inputs are supplied or programmed out.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
I can't remember but this isn't a fresh rebuild is it? You would expect a fresh motor to be a little tight for the first 1000mi or so. As others have suggested verify the timing is right, and pull the codes just to see if anything significant comes up, smog related codes won't affect engine operation but a trans code would for example because the computer will try to protect the trans by limiting engine output.
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