currently doing a maf cal. And I found an issue. My LTFT where too high indicating a boost leak of some sort. So I began looking for the issue.1. During idle my ltft are positive. During maf and normal driving +ive double digit LTFT. At wot my afrs are rich.
So deduction thus far. A vacuum leak would give me positive trims. At wot vacum becomes boost and cause a leak with rich afrs. So after read ms forum threads I deduced it could be the purge valve.
At first my STFT where 25, did a purge valve bypass and blocked off the nipple to the manifold....reset ecu. Idle showed the stft at 25 ltft at 0.... 6 mins later ltft at 20. Stft at -1 to 2..... ok moving on....
60 kms later.... ltft from idle to 3000 rpm are 20 and 17 for balance of rpm.
Now Im not sure what else to look for. Did a boost leak test revealed a small pin hole leak from egr block off. Sorted that Pressure to 15 psi is realised very slow.
The intake manifold has never been tampered with or removed.... the downpipe before the 1st O2 sensor has visually no leaks and no exhaust soot. .... not sure where to look are what to do now....
Plz advise on what else could be the issue.....
I
