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Abstract:
This video focuses on a Ford Ranger 3.2L 5-cylinder diesel experiencing severe engine knocking and rattling, particularly during cold starts. The issue persists despite a previous engine replacement due to a melted piston, leading to the suspicion that the original fuel injectors, deemed okay by a Bosch service center but reused in the new engine, are faulty. New injectors have been ordered to resolve the combustion knock. The second part of the video shifts to showcasing and explaining a custom software tune for the Ranger's automatic transmission (TCU flash). A test drive demonstrates the benefits, including smoother "BMW-like" shifts, reduced torque converter slip during cruising, optimized shift points for lower RPM operation and potentially better fuel economy, and enabling 6th gear usage while towing. The presenter explains the transmission's cold-start behavior (increased slip for faster warmup) and the tuning philosophy. A remaining challenge is activating the permanent gear indicator display in D and S modes, for which community input is requested.
Ford Ranger 3.2L Troubleshooting and Transmission Tuning Demonstration
0:00:09 Vehicle Issue: A Ford Ranger 3.2L is presented with troubleshooting needs due to extreme engine knocking and rattling noises.
0:00:18 History: The vehicle previously suffered a melted piston (on the 3rd or 5th cylinder) and received a replacement engine.
0:00:26 Cold Start Noise: A cold start is performed, clearly demonstrating loud rattling and uneven running.
0:02:04 Suspected Cause: The presenter strongly suspects faulty fuel injectors are causing hard combustion knock, especially noticeable under light acceleration.
0:02:08 Action Plan: Five new injectors have been ordered and will be installed and programmed to fix the knocking issue.
0:02:37 Injector History: The injectors from the original failed engine were tested by Bosch Service, declared okay, and reused in the replacement engine, likely transferring the noise problem. Previous workshops dismissed the owner's complaints, calling the noise "normal".
0:03:21 Focus Shift: The video transitions to discussing the benefits of tuning the automatic gearbox software (TCU flashing) on this Ranger model.
0:03:40 Tuning Benefits: Previous tuning provided a pleasant driving experience, improved trailer towing (enabling 6th gear use even with a trailer connected), and better shift point logic.
0:04:01 Minor Faults: Some unrelated minor issues are noted (leaking water pump, low coolant) which will be addressed.
0:06:28 Cold Transmission Behavior: Explanation of why the torque converter has more slip when cold β it generates friction to warm up the transmission fluid faster.
0:07:34 Test Drive: A test drive commences after the vehicle warms up to demonstrate the tuned transmission's behavior.
0:08:03 Tuned Cruising: The tuned gearbox provides smooth cruising with optimized (reduced) converter slip, described as "BMW-like". It avoids excessive vibration by not locking up completely at very low speeds.
0:09:30 Optimized Shift Strategy: The tune prevents the gearbox from "messing around" in the converter, holds gears appropriately during acceleration, avoids pointless high revving (e.g., "up to 3000"), shifts up quickly when target speed is reached, and maintains low cruising RPMs (e.g., 1400 RPM at ~80 km/h).
10:43 Stoll Speed Mention: Briefly touches on the concept of "Stoll Speed" where the engine operates efficiently for power/emissions, which stock tunes sometimes achieve via converter slip; the custom tune aims for directness.
11:13 Engine Advantage: The large displacement 5-cylinder engine benefits greatly from the optimized transmission logic, allowing effortless low-RPM cruising.
11:32 Tuning Offer: Viewers interested in Ranger engine or transmission tuning are invited to inquire, highlighting potential fuel savings and customizable shift behavior.
12:00 Gear Indicator Challenge: An ongoing task is to enable the permanent gear indicator display in Drive (D) and Sport (S) modes (it currently only works in Manual mode). Input is sought on how to achieve this (coding or software patch).
13:00 Closing: The video concludes, inviting questions and making an April Fools' Day joke about offering software tuning for manual transmissions.