Ford Ranger Engine Problems

This sounds very much like a fuelling problem. Since a diesel engine has no ignition system (beyond its own compression) any fall off in performance can often be traced back to the fuel system.

The best bet is to take the vehicle to a diesel specialist that knows this make and model and will have either seen this exact set of symptoms before or will be able to make a logical diagnosis rather than just changing random parts that may or may not be the cause of the problem. Things that are likely causes, however, are the fuel filtering system, fuel pump and injectors. But don’t rule out something simple like a bad batch of fuel that is playing havoc with the entire system.

That model Ranger does, indeed, have what’s called a variable-voltage or `smart’ alternator. The idea is that when the car’s main battery is fully charged, the alternator reduces its workload to save fuel. But the reality is that the system doesn’t always recognise that accessories (like a second battery) have been fitted to the car. If that happens, the alternator doesn’t always make enough power to keep accessories like that second battery system fully charged. Which means that suddenly, your car-fridge won’t run overnight.

The good news is that this smart function is purely electronically controlled, and a Ford dealer can disable it for you, returning the alternator to conventional operation.

The C-TEK brand has a huge reputation for performance and safety. I've personally had such a charger for more than 20 years which has been in use almost every single day of that time and still works perfectly. They're more expensive than some chargers, but the inbuilt protections against incorrect connection and overheating are worth the price, not to mention that longevity.

Some mechanics recommend connecting the two leads from the charger directly to the battery terminals, but conventional wisdom says that connecting the red cable to the positive terminal first and then the black cable to an earth somewhere in the engine bay is a better idea. This method means less chance of a spark igniting gasses emitted by the battery as it charges and discharges.

The indicator lights on the C-TEK unit will tell you when you've achieved a good connection. Using a metal part of the car for the negative attachment point works because the whole car is essentially one big negative terminal. Just make sure your attachment point isn't painted or coated with a chemical that prevents the flow of current. Or that it's not a plastic part (increasingly common these days). Many cars have a dedicated post or connection point within the engine bay.

It sounds very much like a computer problem rather than a hardware issue. When you switch the engine off and then back on again, you’re actually rebooting the on-board computer. I’d be trying a replacement ECU module (borrowed from another Ranger) to see if that fixes the problem. The problem is that because the reboot fixes the issue (temporarily) it might also re-set the computer’s memory, meaning it can’t `remember’ what went wrong and, therefore, won’t offer up the correct fault codes when you scan it. That said, I’d definitely give it a scan and see what pops up.

Every all-new MY21 Isuzu D-Max and select current versions of the Amarok and Ranger offer a 3500kg towing capacity maximum - namely all Amarok V6 autos and all Rangers EXCEPT the 4x2 XL Single Cab Chassis Low-Rider 2.2 Diesel at the bottom of the Ford range, and the 4x4 Raptor Double Cab Pick-Up 2.0L Diesel at the very top (they're both 2500kg).

Least torquey is the D-Max at 450Nm, followed by the Ranger (2.2L 4-cyl: 385Nm, 3.2L 5-cyl: 470Nm and 2.0L twin-turbo 4-cyl: 500Nm) and Amarok (550Nm to 580Nm), meaning the Amarok will probably be the least challenged towing a 2.8-tonne caravan. But all three should suffice.

Please note, however, that Gross Combined Mass (GCM) tallies means that there are other weight factors that need to be considered before safely towing a 2.8-tonne caravan, even with a 3500kg ute. These include things like the ute's payload, heavy bull bars, sports bars and side steps, canopies and even the number of people travelling inside. And of course, a fully-equipped and laden caravan can easily exceed the stated tare mass.

We hope this helps.   

It could be the either the turbocharger or the injector pump at fault here. But equally, it could be an intake system blocked with oil and soot residue, a clogged exhaust system, worn or blocked fuel-injectors, a dirty air-filter, poor fuel quality. It could even be a dud sensor somewhere on the engine or even an electronic fault within the on-board computer. It might even be an engine that has worn out internals.

The first thing I’d do is interrogate the on-board computer to see if it offers up any fault codes that could be used to diagnose the problem. From there, it’s down to checking the mechanical stuff like the condition of the turbocharger (particularly its bearing) and even performing a leak-down and compression test to get an idea of the condition of the engine.

So, going by your description, the engine has only just started before the vehicle rolls downhill to the first intersection. So the engine has only been running for a few seconds, and then only at idle. It’s possible that the transmission pump hasn’t had time to build up enough pressure to fill the accumulators to eliminate any slack in the shifting clutches and bands. Which could, on the odd occasion, produce a clunk when you hit the throttle for the first time on a cold transmission.

Honestly, though, this is a problem you see more in older cars with worn transmissions, and I wouldn’t expect it from a 2019 Ranger.

But let me ask you a question: Is the vehicle lifted on its suspension? Many Ranger owners opt to raise their cars for greater off-road performance, but this changes the angle of the driveshaft and can cause precisely the shudder you’ve described. The fix is to fit a spacer between the car’s body and the centre-bearing of the driveshaft. That corrects the angle of the driveshaft and stops the shudders.

If it is a major engine issue then, yes, it is a concern, and you could approach Ford for some assistance with the cost of repairs. If it turns out that it’s a relatively minor problem, then it’s not something to be overly concerned about. At this point all you can do is work with the people trying to find the cause.

It could well be a sensor problem, but actually pinning it down when it only happens intermittently is difficult and there might not be anything obviously at fault when the dealer checks the car. There’s no simple answer, except to keep on trying to fix it.

A number of owners seem to be having troubles that relate to the so-called Smart charging system. The system is designed to keep the battery charged to a sufficient level to keep the car going, but as you say there is little reserve and that can result in a flat battery. It’s also important when fitting accessories to the vehicle that connected in a way that allows the ECU to identify that there is greater draw on the system and the alternator needs to work harder. Ford can disable the system for you if that’s what you prefer, and lots of owners are doing that.