The DPF Doctor’s Diesel Particulate Filter Cleaner Diagnosis...

September 2018

Here’s what Darren Darling has said about JLM products in his column in Professional Motor Mechanic Magazine

1. About fixing a 2010 Ford Focus 2.0 TDCI with a DPF problem

“Our weapon of choice for tackling a clogged DPF is the JLM DPF Clean & Flush. This gives consistent great results. We pump in the stage 1 DPF cleaning fluid via the differential pressure pipe and leave this to soak. We then run the engine for a few minutes before pumping in the DPF flush. Checking DPF pressure again we have a nice healthy 4mb at idle. The car is taken on an extended road test while monitoring live serial data to confirm the fix.”

2. About fixing a 2009 BMW 525D with blocked DPF

“We used a JLM engine oil flush and added a can of JLM Diesel Extreme Clean to the fuel tank so the engine would run as efficiently as possible after the repair.

(It’s important we address these problems before tackling the DPF or the DPF would quickly block up again with the car unable to regenerate successfully on its own.) The DPF blockage was a symptom of these faults; not the cause.
We then moved to the easy part, cleaning the DPF! Our tool of choice was the JLM DPF Cleaning Tool Kit used with the JLM Clean & Flush. We used this because it effectively cleans the soot from the DPF in-situ at low temperature.

The JLM stage one DPF cleaning fluid was pumped directly into the DPF via the DPF pressure sensor pipe and left to soak for 5 minutes. We then ran the engine for 5 minutes to allow the cleaning fluid to work its magic. The DPF was then flushed with the JLM stage 2 DPF Flush, the engine running for a further 5 minutes. It was then an extended road test whilst recording serial data to analyse back at the workshop to confirm the car was back to full health.

After road test we measured the DPF back pressure again: a very clean DPF with 3.2 MB at idle. We confirmed that the coolant temperature was now good and there were no glow plug or DPF fault codes stored in the ECU. The car successfully completed a regeneration on-road test so we knew it could take care of itself.

All that was left was to advise our customer of the correct driving conditions that would allow his car to regenerate on a regular basis so that unnecessary DPF problems could be prevented in the future.”

3. When asked if he had seen an increase in diesel problems since the MOT rule changes in May, here’s what Darren said:

“There has been a sharp upturn in vehicles failing the new smoke opacity test and an increase in cars where the DPF has been tampered with. The lower smoke limits are the big problem, especially for higher mileage vehicles but so far we’ve had a 100% success rate using JLM products.” Make sure your stockists are aware these JLM products are approved, tried and tested by The DPF Doctor! He gives full marks to each one.