2.9 Gone Bad - Need some opinions

[Brandon12]

Alright thanks. Makes things alot easier.

 

[UrbanRedneckKid]

94 and below 4.0L makes it the easiest, but watch out for the 94 with California emissions. Make sure if you end up getting a 94, that it comes from a truck with Federal emissions. They are 2 different injection programs, and 94Cali and 95+ have and EGR.

I just had a hell of a time with this when i changed my engine. It's some what explained in this thread.
http://www.therangerstation.com/forums/showthread.php?t=23342

 

[rickcdewitt]

94 and below 4.0L makes it the easiest, but watch out for the 94 with California emissions. Make sure if you end up getting a 94, that it comes from a truck with Federal emissions. They are 2 different injection programs, and 94Cali and 95+ have and EGR.

I just had a hell of a time with this when i changed my engine. It's some what explained in this thread.
http://www.therangerstation.com/forums/showthread.php?t=23342

its 93 for EGR in cali actually 94 fed. 90-92 only has one o2 sensor to buy....

 

[Brandon12]

Well I can basically do what ever I want cause I dont have to do emissions
So am I looking for a sequential injector harness that has 7 wires then?

 

[AllanD]

the 4.0 switched to the 8-bolt "lightweight rotating assembly"
(essentially a 4.0SOHC crank and lighter OHV pistons) sometime
in the latter half of 1997.

I specifically chose a 1993 4.0 engine for my swap because 1993 while it had dual HEGO's was the first year they had an active data link, whereby a real scanning tool could distinguish more than what the PCM considered "normal" sensor values.

'93-up the raw data is output to the scan tool so the user can determin if an "almost normal" value is dead wrong for the current conditions.

1993-1994 is almost "EEC 4-1/2" by comparison to
the earlier EEC4.

AD

 

[Brandon12]

the 4.0 switched to the 8-bolt "lightweight rotating assembly"
(essentially a 4.0SOHC crank and lighter OHV pistons) sometime
in the latter half of 1997.

I specifically chose a 1993 4.0 engine for my swap because 1993 while it had dual HEGO's was the first year they had an active data link, whereby a real scanning tool could distinguish more than what the PCM considered "normal" sensor values.

'93-up the raw data is output to the scan tool so the user can determin if an "almost normal" value is dead wrong for the current conditions.

1993-1994 is almost "EEC 4-1/2" by comparison to
the earlier EEC4.

AD

The be honest, I dont really know what any of that means.
Mind simplifying for an 18 year old?

 

[AllanD]

The mid-97 up 4.0's require a different flywheel as well as a lot of other "different stuff".

The '93-94 while still EEC4 management (OBD1) have some distinct advantages when trying to diagnose problems with them, as compared to earlier 4.0's (or 2.9's)

The diagnostics on the earlier engines is the end result of an electronic
version of "grape vine" where there is a certain level of "dumbing down"
the answers inherent designed into the system.

The '93-94 with their active data link lets the scan tool read the
sensor values directly.

So if you are standing in front of an overheating engine and the scan
tool reports that the ECT is telling you the engine is at 175deg then
you know the sensor is ger-fukt.

Ditto if it's telling you the air charge temp is 40degrees on
a beautiful august day... In Dallas.

That's what "almost right" sensor readings are, sensor readings that are
"within the normal range" but under circumstances where the sensor
reporting a "normal reading" is about as likely as satan starting a
snowball fight with jesus in downtown hell.

The point being the mechanic must see what the sensor readings
are to identify "bullshit" readings.

If you are converting a Gen1 2.9 truck to a 4.0 you really don't want to get involved with an engine (or management) newer than 1994.

AD

 

[Brandon12]

If you are converting a Gen1 2.9 truck to a 4.0 you really don't want to get involved with an engine (or management) newer than 1994.

AD

Thanks. Makes alot more sense now. Esspecially that part.