Need some help with an AE diagnosis of an injector issue on my truck. As far as I know, injectors are original (253k), there is a LL in cylinder #8 and I have a blue CPS.
Hard start unplugged below 50 degs. In the previous few years I've replaced GPs and GPR with stancor.
When cold, it starts horribly and sounds like it has a miss for a few minutes then it warms and runs fine. I am pulling P0264 - Cyl #2 inj circuit low and P1274- Cyl #4 high to low side open. When it warms up, these codes go away. IR therm seems like drvr side is not warming like the pass side. SO thinking this pointed at the harnesses - I replaced UVCH and gasket on the driver side.
Still starts hard when cold.
Performed the IDM pin tests shown on the GB reman TB#103 http://www.gbreman.com/techbulletin_103.html
- Test 1 results show all on left bank at 3.8, 3.2, 3.4, 3.8 and on the right bank 4.4, 5.1, 5.1, 20.5
Right bank power feed to Inj #7 Ground circuit shows 20.5 ohms, a much higher resistance - 20.5 ohms, between pins 24 and 20. The whole right side is higher than the test says all should be at b/w 2.8-3.6 ohms
Test 2 and Test 3 pass and are open.
I am replacing the harness and gasket on the passenger side, but am wondering if there is a way to confirm this isn't an injector issue with #7 while I have it opened up or a wiring issue between harness and IDM.
Thanks for the help,