Torque Index reference
Sources
The 2,294 records on this site rest on 49 named publishers and a set of parts catalogs. Each record page states its provenance tier; this page shows who we read, and how many records cite each. How we tier and source facts.
Government safety data
Recalls, defect investigations, owner complaints and manufacturer communications.
Vehicle and parts makers
The makers' own catalogs, manuals and product pages.
- Ford Motor Company 419 records For example: Water pump failure · DEF heater faults and harness corrosion (P20BA) · EGR bypass valve / EGR cooler faults (recall 20E04)
- BD Diesel Performance 21 records For example: Charge-air-cooler condensation: boost shudder / hesitation in humid weather · Cam phaser / VCT rattle and cam-timing DTCs · Cooling service: thermostats, hoses, degas system under tow load
- Banks Power 15 records For example: Banks Power Billet Heater Kit, 1500W (2007-2018 Ram 6.7L Cummins; requires Monster-Ram installed) · Banks Power Billet Heater Kit, 750W (2007-2018 Ram 6.7L Cummins; requires Monster-Ram installed) · Banks Power Dual Heater Upgrade Kit (2007-2018 Ram 6.7L Cummins; requires Triple-Heat-capable Monster-Ram)
Independent writers and trade press
Technical articles, model histories, reliability surveys and reviews.
- DieselHub 55 records For example: Cooling system degradation / no coolant filtration · FICM (Fuel Injection Control Module) failure · Marginal regulated fuel pressure (blue spring)
- Diesel Army 43 records For example: 2020 GMC Sierra 1500 · 2020 Chevrolet Silverado 1500 · 2021 Cadillac Escalade
- Road Ethos 42 records For example: 2020 GMC Sierra 1500 · 2020 Chevrolet Silverado 1500 · 2021 Cadillac Escalade
- GM Authority 35 records For example: Intake-valve carbon buildup (direct injection, no port wash) · Cooling system wear: water pump, hoses, thermostat (towing duty) · Direct-injection high-pressure fuel pump / injector failures
- J.D. Power 30 records For example: 2018 Ford Expedition · 2019 Ford Expedition · 2020 Ford Expedition
- Car and Driver 27 records For example: 2015 Ford Expedition · 2016 Ford Expedition · 2017 Ford Expedition
- Edmunds 26 records For example: 2015 Ford Transit · 2016 Ford Transit · 2017 Ford Transit
- Comvoy 24 records For example: 2011 Ford E-350 Super Duty · 2011 Ford E-350 Super Duty · 2011 Ford E-450 Super Duty
- The Diesel Page 16 records For example: 2007 Chevrolet Express 2500 · 2007 Chevrolet Express 3500 · 2007 GMC Savana 2500
- Automotive Fleet 9 records For example: 2014 Ram ProMaster 1500 · 2014 Ram ProMaster 2500 · 2014 Ram ProMaster 3500
- MWS Mag 7 records For example: 2020 Ford Transit · 2021 Ford Transit · 2022 Ford Transit
- Work Truck Online 6 records For example: 2014 Ram 1500 · 2015 Ram 1500 · 2016 Ram 1500
- MotorWeek 4 records For example: 2021 Ford Expedition · 2022 Ford Expedition · 2023 Ford Expedition
- MotorMatchup 4 records For example: 2015 Chevrolet Express 2500 · 2015 Chevrolet Express 3500 · 2015 GMC Savana 2500
- Auto123 4 records For example: 2001 Chevrolet Express 3500 · 2001 GMC Savana 3500 · 2002 Chevrolet Express 3500
- TruckTok 3 records For example: DEF system failures: tank heater, dosing, quality (L5P) · DPF ash loading / excessive regeneration + differential pressure sensor · NOx sensor drift/failure (SCR efficiency codes)
- Kelley Blue Book 3 records For example: 2015 Lincoln Navigator (Lincoln) · 2016 Lincoln Navigator (Lincoln) · 2017 Lincoln Navigator (Lincoln)
- Pickup Truck Talk 2 records For example: Extended crank / long-crank no-start (air intrusion, check valve, cam wheel) · LZ0 crankshaft thrust bearing failure (GM bulletin 25-NA-307)
- SPE Tuner 2 records For example: CP4.2 high-pressure pump failure (contamination cascade) · DPF regeneration duty and oil dilution
- ClassAction.org 2 records For example: 'Pentastar tick': rocker arms, hydraulic lash adjusters, cam damage · The 'Pentastar tick' path: compression/leak-down first (rule out the pre-ProMaster 2011-2013 head issue and exhaust leaks), then rockers and lash adjusters, cam replacement only where a lobe is damaged
- The Spokesman-Review 1 record For example: 2020 Ford Expedition
- Duramax News 1 record For example: Coolant flow control valve failure (active thermal management)
- Lemberg Law 1 record For example: LZ0 crankshaft thrust bearing failure (GM bulletin 25-NA-307)
Owner communities
Where owners compare notes: we use a forum only where many owners agree.
- Power Stroke and Diesel Stop forums 69 records For example: Cooling system degradation / no coolant filtration · Degas bottle / coolant reservoir crack, or failed cap · EGR cooler failure
- SilveradoSierra.com 63 records For example: Exhaust manifold bolt breakage (cold-start tick) · Hard cold start / fuel delivery wear · Ignition service at mileage: coils, wires, plugs (misfire under load)
- DuramaxForum 37 records For example: LMM DPF-era service (regeneration / ash service) · EGR cooler clogging / failure (LB7-LMM) · CP3 pump / fuel system contamination
- RamForumz 34 records For example: Cooling service (water pump / thermostat) · EGR valve carbon (gas EGR service surface) · Exhaust manifold bolt failure / leaks (HEMI tick source #1)
- Reddit (r/Diesel, r/PowerStroke and others) 13 records For example: Cooling system degradation / no coolant filtration · EGR cooler failure · FICM (Fuel Injection Control Module) failure
- GM-Trucks.com 13 records For example: Direct-injection high-pressure fuel pump / injector failures · Valvetrain hardware failures: lifters, valves (no AFM - attribution guard) · Cooling system wear: water pump, fan clutch, thermostat (L96)
- Sprinter-Source 11 records For example: Injector seal blow-by ('black death') · EGR system: coking and cooler coolant leak · Glow plug module and cold starts
- Ford-Trucks.com 8 records For example: Cooling service (water pump / thermostat / degas) · Exhaust manifold leaks (broken manifold bolts) · Fuel delivery service (in-tank pump / filter / PFI injectors)
- WranglerForum 4 records For example: Plastic oil filter/coolant housing-adapter leak (the signature Pentastar leak) · 'Pentastar tick': rocker arms, hydraulic lash adjusters, cam damage · The signature Pentastar repair: replace the cracked/weeping plastic adapter-housing with the updated housing (or an aluminum aftermarket unit), new gaskets and o-rings, correct torque
- BenzWorld 3 records For example: Injector seal blow-by ('black death') · Intake port shutoff (swirl) flaps and motor · Catch-it-early injector reseal: the copper seal blows by, combustion gas cokes around the injector ('black death')
- ProMasterForum 3 records For example: EGR system: coking and the cooler-with-valve assembly · Glow plugs and module: cold starts · Flashing glow lamp or rough cold starts on the ProMaster EcoDiesel (F1C): the lamp names the cylinder - measure plugs before condemning the module (mode fm-pmed-glow-start)
- Diesel F-150 Forum 3 records For example: CP4.2 high-pressure pump failure (contamination cascade) · DEF heater faults and harness corrosion (P20BA) · EGR bypass valve / EGR cooler faults (recall 20E04)
- Ram 1500 Diesel 3 records For example: DEF tank / heater faults (frozen-DEF derate cycle) · Oil cooler oil/coolant cross-contamination · DEF system job for the 3.0L EcoDiesel (mode fm-r150e-def-heater): 'SERVICE DEF SYSTEM - ENGINE WILL NOT RESTART IN 200 MI' cycle, stuck gauge, cold-weather faults
- F150Ecoboost.net 2 records For example: Internal water pump: coolant loss and coolant-into-oil risk · Internal water-pump service: the 3.5L EcoBoost carries the pump inside the front cover - a failed seal can send coolant into the oil pan (bearing damage) or leak externally
- FordTransitUSAForum 2 records For example: Fuel filter / water-in-fuel service and cold-weather power loss · Fuel filter service and cold-weather power loss: the most common service stop on the 3.2 (SSM 45872 service tip; SSM 48601 cold-weather power loss)
- MBWorld 2 records For example: EGR valve and intake coking · Diagnosis-driven EGR/intake service: clean before you replace
- MB Club UK 2 records For example: EGR system: coking and cooler coolant leak · EGR coking and swirl-flap service on the 2.1: EGR soot jams the port shutoff flaps (P2017-family codes) and cokes the valve/cooler
- Bob Is The Oil Guy 2 records For example: Plastic oil filter/coolant housing-adapter leak (the signature Pentastar leak) · The signature Pentastar repair: replace the cracked/weeping plastic adapter-housing with the updated housing (or an aluminum aftermarket unit), new gaskets and o-rings, correct torque
- F150Forum 1 record For example: High-pressure fuel pump (GDI) failures
- Mercedes-Benz Owners club (MBO), UK 1 record For example: Timing chain stretch (long-oil-interval related)
Reference works
Model years, production histories and engine families.
- Wikipedia 1,340 records For example: DPF clogging / regeneration problems · EGR cooler failure -> #8 hydrolock · Front-cover pump cavitation erosion (coolant into oil)
Retail prices
Prices on this site are our retail partner's (see how we disclose it).
- Dave's Auto Center 75 records For example: Low-pressure fuel supply weakness (lift pump, filters, water-in-fuel) · CP3 and fuel-system contamination service (fm-dmx-fuel-system-health): the Bosch CP3 is fed by the OEM filter setup, and water/debris are the standing threats · LMM DPF-era service (fm-dmx-dpf-era-service): the LMM (from mid-2007) is the first DPF Duramax
Plus 22 dealer parts catalogs and parts retailers' guides behind 845 records, mostly part numbers and fitment. We cite them by what they are, not by name: the only store this site names or links is our retail partner (see the disclosure).