88xl5.0h , my computer was also bad by not throwing any codes at all. I changed it out snd it helped alittle bit and also gave me codes. Was there anything else on yours causing it to smoke?

 

Check the fuel pressure regulator as noted previously. This is a very common problem.

 

should I check it while its running or after I turn it off?

 

i did check by pulling the vaccum hose from the regulator while running and turned off but didnt notice any gas or anything.
since i am getting a code 126 for low egr, can I just delete the egr completely? and the cat has long since been removed and the pipes to it.

 

Nope, computer was entirely to blame for mine.
As long as the key was on, the fuel pumps were running. And when the computer does its diagnostics, it cycles the fuel pumps, I couldn't retrieve codes because it couldn't cycle the pumps on and off. I popped a used computer in and it drove out like a champ. And also before, it had my trans in limp mode. The computer fixed that as well.

 

Since i have code 332 in continous memory and126(even though i changed the map) and a 553.would i be able to remove the egr completely? It is still running really rich.anf blows black smoke under a load.

 

What year truck was the computer out of and what transmission and engine did it have?
A map sensor will give black smoke so check the vacuum to it and the wiring also.

You can block off the EGR valve for a test if you want to.

The 553 may be bad vacuum lines or electrical connections.

 

The computer came from a 93 f350 with a 460 5 spd like mine. But it was a crewcab with a/c

 

Also, while the truck is running i have slowly unhooked tje vacumn to the map and it does kill the truck.and i have disconnected the harness and the rpm revs up ,but it still drives the same.

 

Note that above when I said "You can block off the EGR valve for a test if you want to.".
This will not get ride of the EGR code.
The test was just for the running of the engine to see if the engine would run OK with it blocked off.

 

Well all engines will run ok with the EGR gone - at idle. EGR is disabled at idle and WOT, and is only used at speed and varies with light acceleration. (specifically EGR is used to keep cyl head temps down to resist the formation of NOx)

If you get the insufficient EGR code, test the EGR valve first for leakage - pull 8-10 inches on it and make sure it holds for a few seconds, then test the EGR solenoid for lockout when off, and see that you can engergize it with 6+ volts. If you do not want to shell out the $30 for a solenoid, just about all 88-93 EECIV V8s used the exact same solenoid. And all the EFI 460s used the same EGR valve (there may be different numbers from year to year but this deals with clocking of the vacuum port)

 

i've rescanned the truck again and kep getting a 553 in keo mode and a 332 in c mode .even though I have changed the egr valve and solenoid from my parts motor that both were good.
the 553 i cant figure out what it exactly is.
the truck will still blow out black smoke and stumble/miss under a load.
I also have changed the vacumn hoses to the fuel vapor canistor as they were soft, changed the air bypass valve.

 

DTC 553 indicates that voltage output for Secondary Air Injection solenoid(s) did not change when activated.

Possible causes:
-- AIRB/AIRD circuits shorted to power.
-- AIRB/AIRD circuits open or grounded.
-- AIRB/AIRD resistance out of range.
-- Damaged PCM.

You need to put a meter on the wires to the solenoids (not the red wire) from the computer and see if the voltage changes during the KOEO test. Neg meter lead to ground.
But make sure the red wire has battery voltage on it at all times the key is on.

What the test is doing is if the computer sees battery voltage on the wire to the solenoid and it then takes the wire to ground it wants to see zero volts but if it still has battery voltage then it puts up the 553 error code.

OR

If there is zero voltage on the wire to the solenoid (should be battery voltage) and it then takes the wire to ground it wants to see a change but it still has the same voltage so it puts up the 553 error code.

Or at least this is the way understand this error without reading the computer code for it.

 

im not sure if this would cause it, but i found my white wire to the alt plug(3 wires, 1 whilte,2 black-red stripe) was broken out of the plug. Would this cause the problems?

 

That may cause the alt to over charge or not charge but it would not cause the problem you were talking about.