Ford Ranger Pricing and Specs

Since you’ve replaced the turbocharger and the boost controller, we can rule those out. But could the problem be something much simpler?

It’s possible that the plastic trunking that takes the compressed air from the turbocharger to the engine’s intake has split. When that happens, boost pressure is lost, the boost sensor detects the low boost and winds up the turbocharger to compensate and you have an on-paper overboost situation.

Then, once you’re beyond idle, the leak becomes even worse and the computer simply runs out of turbocharger capacity, at which point boost drops away. That’s preventing the engine revving properly and since there’s no sensor to tell the computer that the trunking is split and leaking, there might not be a fault code issued. Lots of black smoke from the exhaust is often (but not always) another clue that this is what’s happening.

On this model, the sensor in question is located on the crankcase (not the cylinder head as many are). You’ll find it on the driver’s side of the crankcase, below the intake manifold. Replacing it involves removing the old one by screwing it out, and screwing the new one in. But there’s a bit of a process for this, and if you’re not familiar with this type of job, it’s probably one for the experts.

The sensor is located between cylinders three and four and it’s located pretty close to the manifold. The good news is that you don’t need to remove the manifold to access the sensor; you can get to it by going into the engine bay through the wheel-well.

Don’t forget that you’ll lose some coolant in the process, so that will need to be topped up with the correct type afterwards. Remember, too, that the new sensor won’t work unless you correctly reattach the wiring plug that connects the sensor to the rest of the car. This area can be pretty grimy and muddy in a vehicle like this, so cleaning everything off first is a good idea.

Your mechanic is spot on. As far as the warranty laws in this country are concerned, there’s no difference in having the vehicle serviced by a Ford dealer or by a qualified independent mechanic. If there’s a problem down the track, it won’t matter who serviced the vehicle; a warranty claim is a warranty claim. Your peace of mind should be no different either way.

The only difference might be if Ford looks more favourably upon your case considering you’ve been a loyal customer and had the servicing done by your dealer. But don’t go to the bank on that, as it’s by no means a legal requirement, nor a widespread occurrence.