I got the whole 4L80E swap done!!!! But my truck runs like CRAP Anybody knolw whats wrong? I did a Fuel pressure regulator swap from Auto Zone and changed the power steering pump, also comlpetely removed the EGR and stuff I have just a plug sitting there. It idles really really rough and has nothing after second. It is a BRAND NEW TRANNY (and I did do all the harnesses from speed enginerring) I do have a W4Me tune does any body have any ideas?

PLEASE HELP I MISS MY TRUCK

 

Did you have a file from a 4L80 equipped truck flashed into your PCM??

 

yeh, did you just swap it and not have jesse write you an 80e file? PLus egr has a table or twp that is nice to zero out.

 

the EGR and the 4L80E files should have been delt with. I dont know why it is running the way it is but something is wrong. I mean not only the tranny but idle and everything.

 

maybe the spring in the regulator is hung or fuel leaking by for some reason causing your fuel pressure to be way off.

 

Genral rule is what ever work you did last is most likelly the cause of the problem, of course not alwas, but......
Did you check the fuel lines, they run right next to the bell housing.

What does the truck do? any codes? Why the fuel reg swap?

 

fuel lines were leaking but fixed that and the fuel reg was bad having trouble starting

 

No codes? What is it doing?

 

I'd be dead set at making sure that fpr was lubed up well and that tiny gasket seated properly. Did it idle fine with the "bad" fpr? If so put it back and deal with the hard starts for a minute or two to compare idling between the two as so you can rule the fpr out. If you are having fueling issues and losing power after second be careful of lean conditions...you don't have to hear the knock.

 

I will double check my FPR and I threw out the old one. It did idle a little funny with the old FPR but nothing like this! The idle is bad really really bad. I mean the whole hood shakes and sounds like it is hitting the fender. if I rev it a little the vibrations go away but they come back. I dont have any lights on but I didnt let it run for very long. If I punch the gas and let off real fast it knocks and sounds horrible!!!!