I've been having the check engine light on for a couple of months now.. haven't had the time to check it out until yesterday. The diagnostic showed about 4 codes, 3 of them having to do with misfires on three cylinders and the other one stating "system too lean". About a couple of months ago, is when I noticed the change in the engine (a bit more knocking and pinging). and since I had the TB problem (APPS and TPS), I thoght that the system too lean problem would be cause of the TB. I bought the new TB, and the system kept running lean. One thing I had remembered is that some time ago, I found out that my Boost gauge was not working, so I checked the vacuum lines, and a couple of them were disconnected (broken vacuum connector). I replaced the vacuum connector and placed the vacuum lines how it seemed the most logical. the boost gauge worked again but the engine was running lean. I currently have the URD injectors/FTC kit, and Maps A and B seem to have the correct values (same as before it began knocking ang pinging). Although, a change I did notice after noticing the non-functioning boost gauge is that I'm gettin about 8.5 psi, compared to the 7 psi i used to get before anything happened. I'm wondering what the problem might be.. is there a possibility that I placed a vacuum line in its wrong location? Should I check spark plugs? spark plug cables? Change FTC values? (My current values go from 8.8 to around 9.8-being the highest) Any other suggestions? I'm mostly considering checking spark plugs and wires, but not sure if that would be the most probable cause... Any help is greatly appreciated.
JAG
JAG