Very Weird I am thinking leaky injector//Thoughts?

Facts:
1. Truck runs fine after about 3-5 driving cycles it acts up
2. Runs a little rich all the time but extremely rich /shakes almost dies when acting up at low rpm and or idle…sputters when under light acceleration but seems fine at ¾ or WOT sometimes… WOT will sometimes clear it up
3. Sometimes acts up after a light romp on the pedal and/or 3-5 driving cycles with no association.
4. Has pulled typical 02 codes or similar I believe the 02 #1 on bank one/ two not reading associated with OBX headers and mostly on cold days… cleared C E light about 4 times thus far
5. 45 psi fuel pressure 40 under high-revs at park

What I have had done recently:
1. New mail order tune. (closed loop)
2. Brand new stock 8.1 injectors from 2003 24lbs not much difference
3. Both done about the same time frame then starting acting up

What gets me its with a number of drive cycles not as apparent as an injector just not shutting off only had one misfire code…but it seems more associated with drive cycles….

I guess my options are to of course make sure plugs / wires/ coils …working great …but pull the new injectors back out and put stock ones back in to see if it still does it…what’s the best way to single it out if its just one injector acting up…leaking or not working ?

 

Have you tuned for the new injectors?

 

I thought it was there only the 8.1s but after emailing i dont think that was done...he will do it though...does sound like what it is...i think the 8.1s are only 31 lbs vs 24 i guess that makes a big variance...

 

the 8.1 marine injectors are more like 41-44 pounds I think

but it definitely sounds like thats the issue.

 

Hmm could be ...I dont have Marine just the stock 8.1's but i guess i ll see when i send it to him...(thats whys Iam always happy to have a spare ECM )

 

I tell you guys Charles Wheatly is a great sponsor and really will stand behind anything he does ,(the injector replacemnt was an oversite on my part), anyway again great customer service...certainly earns the tune fee and then some I dont know how he keeps up with everyone...GREAT SERVICE!!!!