[beck125]

recently just rebuilt the heads in my 03 4.7 , new heads, new lashers, new rockers, new gaskets, and plugs... my issue is its throwing a vacuum leak code and runs like its missing. To start the motor it takes over quarter throttle to fire, after it fires; it is wanting to idle between 3 and 400 rpm.. fluttering and sounding like its missing and without giving it throttle it will not idle, the throttle body has been cleaned and I went ahead and replaced the tps .. map and IAC valve, with no change. Mechanically it is timed, I have checked it with an inductive timing gun on cylinder 1 and 8 and it is timed. But the motor is running as if its not timed, does the pcm need a re learn program, or re-flashed ? I am at a loss here after checking the timing a dozen times and with a live diagnostic it is 12* advanced at 8-900 rpm ... any advice would be greatly appreciated ..
jb

 

[hydrex]

Intake manifold gasket? How's the hose to the brake booster? Timing and fuel trims can be adjusted with a Diablo tuner, but I don't think timing is the problem.

 

[beck125]

Put new orings in the manifold ..hoses are solid and all hooked up

 

[beck125]

Ok new news.... checked compression andall 4 on passenger side are dead .. making me assume itsout of time all together . I cant just change the timing on that side it has the tone ring and it has to corespond with the ring on the crank ... having the dots lined up on the idler gear and main timing gear in the timing cover do they absolutly need to be lined up with the dots ? The primarys where not touched or pulled during the rebuild ..? I feel its off by half a tooth holding the cam on exhaust stroke ... any help my brain hurts from over thiking this

 

[thunderhawk]

I hope your efforts was not lost cause the 4.7 will not jump time far before pistons hit valves they have to be in time or bad things happen