Can injector solenoids within electrical spec (ohms) still fail to keep up with ECM?

[WalterJ]

I've shared my saga here trying to solve engine stumble at higher RPM whilst using Banks Pwr Lvl 6.

Is it possible that injector solenoids within resistance spec, can still fail to operate 'perfectly' at higher demands from the ECM?

We unsuccessfully tried viewing this using an OBDII splitter cable, such that Banks & the shops' diagnostic computer are in parallel. Thanks for your patience.

Wally

 

[cerberusiam]

If the solenoids are tired or out of spec you might see high rpm issues and read fine at idle. What spec are you trying to use? There are timing specs on solenoid operation depending on voltage and balance, or, just an ohm test?

 

[WalterJ]

cerberusiam: Thanks for that insight. I'm ignorant of solenoid evaluation/testing. None of my 'home' contacts & advisers broached this topic at all, i.e. aside from coil resistance, no other considerations were voiced. Next I'll send them an email or letter with this, your latest input.

There's a nicely appointed diesel shop nearby in Kissimmee, FL that quickly & good naturedly resolved my 'blown up' flex plate last year. I have a favorable impression so will visit them next week for a discussion re: "solenoid testing" as mentioned here by you.

I want ALL my truck back, so still searching for THE solution. Thanks again for your expertise.

Wally

 

[Bob4x4]

I would suspect the banks system or connections first.I would also want to monitor Rail pressure.Easist way to eliminate a banks issue will be to remove it from the truck and try to duplicate your concern

 

[EDankievitch]

I had a stumble at high RPM not under load on my 05. It turned out to be a cracked Nozzle. sems the crach would allow more fuel in to the cylinder. The computer would see the engine RPM jump when theat cylinder fired and would cut back the fueling. the result would be a slight bucking when coasting down hill in gear and a stumble at high RPM in nutural.

 

[WalterJ]

I would suspect the banks system or connections first.I would also want to monitor Rail pressure. Easist way to eliminate a banks issue will be to remove it from the truck and try to duplicate your concern

Thanks. Trouble is, my 'stumble' only occurs when at Pwr Lvl 5 (sometimes) & 6 during demands above 2300rpm unloaded, and similar demand at lower speeds when hauling; cannot induce 'stumble' without Banks tuner & cannot haul without it. We easily traveled 1254 mi. last week to Orlando, FL area, keeping Banks Pwr Lvl to 3-5.

As a last resort I agreed to replacing the ECM, no joy. The APPS signal wire has a Geno's noise filter tapped onto it, no joy. Crank sensor & connectors replaced, no joy, still throwing P0336 code.

Banks rep can only point to tone wheel or crank damper. Tone ring is perfect & replaced the crank damper with: Summit Racing Equip: Obtained replacement Crank Vibration Damper p/n #ATI-917374, MANUF # 917374, o.d.=7.8", 3 O-Ring shell designed for easy "rebuilding/repair"; smaller than OEM Dia designed to permit changing serpentine belt without removing damper! This in prep for 10-13-2015 engine front cover oil gasket repair.

Thanks to "cerberusiam" I'll be researching the technical aspect of injector solenoid evaluation. I'm also considering replacing the Crank Position Sensor wiring to the ECM, with a twisted pair to eliminate possibility of induced electrical 'noise'. Injectors were replaced 10-11-16, so those connectors were 'exercised' as well. Keep your thinkin' cap on, eh.