I got the 408 installed after I destroyed my 6.0L on too much boost. I got it started last night and it was running really rough and showed reduced power. I was also getting P0120, P0220, P1518 and one other TPS code. The HPT was showing aa failure for TPS to talk to PCM. The only thing that I dod with the TB was take it off and clean all the crap out of it with some brake cleaner. I am wondering if the truck is running in reduced power because of the TPS problem? Did I fry the TPS with the brake cleaner? I can not clear the problem. Any help?

 

Should I just order another TB?

 

would you guys replace the TB?

 

I think you have a TAC module on your truck that goes between the TB and the PCM and converts the signal between the two of them. It is on your firewall above and to the right of the brake booster. A small black box attached to the firewall. Make sure it is all plugged in correctly? This could also be the source of your communication problem.

 

I will take a look at that box. Is it the one on the firewall that is about 4"x6"? I do know that I had to relocate that box for my Vortech setup and now that I sold the Vortech I had to reinstall it back to the stock location. MAYBE I screwed up the plug? No idea I will check it tonight.

 

the P0120 code will enable Reduced Power Mode, wanna guess how I know? my only solution was replacement of the Throttle Body, which is just over $200 at the stealership (if you can afford to be down look on ebay and on here and you could pick one up for less

 

I've got a few stock TB's you can purchase cheaply and I can ship tonight. You will have a PM shortly.

 

Ground wire not grounded?

 

which ground am I missing? I have the 2 on the back of the block and the 2 on the driver side. Am I missing another one?

 

Is there 3 on the drivers side?