Hey guys, first off my bronco runs fine, I just found a code reader in a buddys shop and decided to give it a try....

My truck:
92 full size eddie bauer 5.8l e4od 151k miles

Anyways, I got me some codes.....
-332-Insufficent EGR Flow-I think I accidently broke those two stupid limp dick plastic hoses by the ignition coil...I think those are for the EGR-am I right?
-311-Thermactor air system inoperate (right side)- No idea...may have to do with my a/c being removed??
-538-Insufficent RPM Change during KOER dynamic response test- What is this?
-181-Fuel system at rich adaptave limit at part throttle-Whats this mean?
-627-Torque Converter clutch circut failure-UMM..no clue




Also, my 4wd LOW RANGE doesnt work, 4wdhigh works, and ovcourse 2wd, just not 4wdlow....how is this diagniosed?and repaired...push button 4x4 and manual hubs.

 

ok.? it runs fine? so did u have an engine light? Do u have a manual?

 

EGR is the pipe on passenger side that runs from the exhaust to the intake, it recirculates exhaust back into the engine. Could be a bad valve or you have an improperly installed exhaust. Thermactor air system failure on passenger side means the smog pump is either broken or disabled. And thats all I can help with on your list

 

And what does this EGR do?, i mean, wich is the benefit of having it working?

 

Ok, first off, EGR and Thermactor... EGR is part of the Thermactor system. The Thermactor system is the combined emissions control systems for the entire truck which also includes the air injection, EGR, and the associated equipment for them.

Code 332 - insufficient EGR flow... the Thermactor system is not providing enough fresh air flow through the EGR system. Make certain the vacuum lines between the diverter valve (behind the right cylinder head) and the TAB (Thermactor Air Bypass) and TAD (Thermactor Air Diverter) solenoids are intact. The solenoids are mounted behind the ignition coil on the left side of the engine.

Code 311 - Yet another indication that the Thermactor system has a problem. the TAD solenoid controls the fresh air injection to the right bank of cylinders. If it is not doing its job, this is the code you get.

Code 538 - This code is generated when the KOER test is performed improperly. During the test, the engine RPMs must be stepped up by the person performing the test to above 2000 rpm's for a set period of time. If this doesn't happen code 538 is generated.

Code 181 - with the Thermactor system not working properly this code is going to rear its ugly head... there isn't enough fresh air through the system and the O2 sensor "thinks" the engine is running rich. In short, correct the other issues and this one should take care of itself.

Code 627 - 600 series codes pertain to the E4OD automatic transmission and its control system. These codes are best suited for a qualified transmission technician but if you are so inclined to pursue the solution, the issue is with the lock-up circuit for the torque converter. It is driven by a host of parameters determined by the ECM (main computer). It could have not operated at the specified time once and the ECM will store this code indefinitely because it occurred while the truck was in a moving gear.

 

just curious, did you make sure the bronco was good and warmed up before you performed this code test?

 

Yes it was warmed up
auto tranny

so none of those codes are real bad?

 

Um, all of those codes are detrimental to the proper operation of the engine. Not having the Thermactor system working properly will cause the ECM to continually hunt for the proper fuel/air ratios and will cause premature spark plug failure, excessive detonation, and eventually cause other parts of the system to fail. Out of curiosity, what makes you opposed to simply fixing the problems?

By the way, if Code 627 is cleared and then shows up again on subsequent KOER tests, you could be slowly killing the E4OD which runs between $2500-$3200 to rebuild.

 

All moral and legal stuff aside... there is no way to remove the smog pump and other emissions off a bronco with EFI?

 

Not without making it impossible to tune and drive properly. The equipment is so well integrated that the truck will actually run better and cleaner with it all working properly. Besides, its not hurting anything unless its not working properly and then its just as easy to fix it as it is to remove it when you consider the consequences already mentioned if you do remove it.

Gotta get folks to realize that the emissions stuff is here to stay. And removing it actually makes things worse in more ways than just from the environmental angle.