Thread: Puma 2.4 Turbo - momentary cuts out

Common cause of momentary cutting out is the VCV (SCV).

i had the same symptoms. On a highway entrance with an incline, under full boost and max load on the engine, i had a miss like the ECU was retarding fuelling. I have a scan gauge and manifold pressure would peak about 36psi (22 psi boost). Turbo failed and as soon as i bolted in new turbo manifold pressure peaked at 34 psi (20 psi) and fuel retardation went away. My conclusion that the turbo was overboosting and the ECU was triggering a fuel retardation. Found power delivery right across the board is better with the new turbo (cheap chinese knock off). Suspect the ECU is no longer dancing the fine line between overboost/fuelling/safety parameters in fuelling tables etc whenever there is extra load on engine (ie hills).

*the turbo cant just cut out, its a mechanical component. the electronics is the turbo modulator which control the variable vanes on the turbo.
*on a 2.4, the turbos rarely fail, they are a reliable unit.
*as it is a 2.4, as already mentioned, the FCV, flow control valve is a common failure.
*other systems are poor starting, some clacky engine running.

*crankshaft position sensor is my guess, common fault on a 2.4 and rarely if ever brings up a fault code.
Ford part number:287Q-6C315-AC

just to add... re turbo upgrade


*"hybrid" turbo generally in reference to waste gated turbos such as the TD5 models, a hybrid turbo on these is an excellent upgrade.
*as the Defender TDCi is already a variable vane turbo / variable geometry turbo there is no benefit (that I see) in putting an aftermarket turbo on them.
*on Defender TDCi models (2007 - 2016) I dont recommend bigger output turbos. the cylinder head dont have the throughput and the head will likely fail.

The only thing I can recommend if replacing a failed turbo or you just want to spend some money on your Defender (hell, who doesnt right?)
*get a new std core from Turborebuilds in the U.K and get the two snails (the intake and exhaust housing of the turbo) and get them ceramic coated, not a rattle can job but an industrial grade ceramic coating. Do the exhaust manifold also.

In theory instead of the heat being radiated through the castings it gets forced out the exhaust, and in theory should improve, performance, whatever.
Instead I do say to all my customers, "in theory" is just that, on a Defender tractor it wont improve nothing except you dont get that radiated heat soak. But customer feedback is it runs better as in performance and economy. My aim is to make the turbo a long lasting component, hence why I rebuild them over replacing with new.

Originally Posted by DazzaTD5

*the turbo cant just cut out, its a mechanical component. the electronics is the turbo modulator which control the variable vanes on the turbo.
*on a 2.4, the turbos rarely fail, they are a reliable unit.
*as it is a 2.4, as already mentioned, the FCV, flow control valve is a common failure.
*other systems are poor starting, some clacky engine running.

*crankshaft position sensor is my guess, common fault on a 2.4 and rarely if ever brings up a fault code.
Ford part number:287Q-6C315-AC

Would crankshaft PS show any other aberrant behaviour? This is the only issue with a ‘miss’ under full noise foot flat.

I have a scan gauge 3 running so will add manifold pressure and see what it is doing…

Originally Posted by Tikka7mm08

Would crankshaft PS show any other aberrant behaviour? This is the only issue with a ‘miss’ under full noise foot flat.

no, but it would account for as you first stated... a split second miss. a stutter if you like.
But not a constant miss under load.

random no starting is another sign

Just remapped the ECU to the 165BHP tune and tested for fault. Is this what you were thinking?