Diesel inlet deposits are caused by excessive combustion soot migrating through your EGR valve and into the inlet manifold, where it mixes with excessive oil vapour from the crankcase breather, to form the tacky goo.

Be aware that this is just one symptom of a bigger problem at play. EGRs will also be coked heavily at this stage! Piston rings will be fouled to varying degrees to create that excess blow-by! Carbon build will be present in combustion and exhaust spaces as well as turbochargers! If you have a Diesel Particulate Filter, you would already have had regeneration issues.

The causes can be as simple as too much city driving, which leads to carboning up. If youíve ever noticed your fuel filter media looking black, then hereís another cause.

Common Rail Diesels run very high fuel system pressures and fine tolerances. And that, combined with engine temperatures, results in higher fuel temperatures. Those temps and pressure can break the fuel down (black fuel filter) within the fuel circuit, leaving deposits and loss of important fuel lubrication.

As a direct result, injectors can become fouled and/or the poor fuel lubricity causes sticking, and hesitation of injector response. Remember, those injectors need to squirt as much as 7 or more times per firing! That requires instant response! It can mean too much fuel (think injector rattle & lots more combustion soot) or too little (power loss, rough running).

Many people fit an oil catch can to remove the oily fumes, and if working efficiently, this prevents the build-up. Catch cans are great insurance, but they donít fix the root cause of the problem. Carbon will still be problematic through the engine itself.

Cost Effective Maintenance have been extremely successful with corrective maintenance for this issue. What needs to occur is cleaning up sticking piston rings, fouled injectors and pumps, decarbonizing through combustion and exhaust spaces, turbos, cat convertors and DPFs.

Clean the oil side with Flushing Oil Concentrate. It will safely remove all sludge, and particularly will disperse carbon from piston ring grooves, to optimize compression and minimize blow-by.

Two products are needed in the fuel, to both correct and eliminate the problem: CRD Fuel Enhancer to clean up fuel pumps and injectors, and also strongly boost the fuel lubricity to restore instant and accurate injector response.

FTC Decarbonizer burns the diesel cleaner to ensure minimal soot production, and actively burn off carbon from combustion and exhaust spaces, turbos, cat convertors and DPFs. It keeps inlet manifolds, throttle bodies and EGRs clean, and if not badly fouled these parts tend to clean up over time. These two products also improve engine performance and economy. Your engine will thank you for it.

If inlets and EGRs are causing problems, then manual cleaning is recommended.

For more information: engine problems solved - Cost Effective Maintenance
Or just give Brid, Jimmy or Matt a call on Ph 07 3376 6188