Quote:
Originally Posted by bjm
I know an independant Jeep trained mechanic with his own work shop who is seeing more and more coked up egr and map sensors.He now says clean both at every oil change even if using a Provent etc.on another subject ,he also said ,the 8 speed ZF auto appears to be handling towing caravans with no problems.Even atf at 90000 ks comes out clean !
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I am sure many Jeep owners don't ever get the Map sensor or EGR tube cleaned!
My opinion is that not doing so will lead to possible fueling issues as the MAP, Manifold Absolute Pressure, sensor won't read correctly when covered in crud, possibly leading to the ECU getting incorrect information and consequently under fueling or over fueling.
Then that will ricochet down the line to the DPF potentially causing clogging issues as the exhaust will be affected either running too hot or too cool.
Plus the sooty crud accumulating on the EGR pipe could start to peel away and be sucked in to the cylinders causing damages. Let alone valves being coated in the stuff.
I think every oil change might apply if the owner drags change intervals out as far as possible. The photo's in my previous post are after 13,000 kms since the previous clean. Though I change the engine oil & filter every 90 days regardless of kms so the oil is always in pretty good shape therefore the amount of blow by is kept to a minimum.
I am going to stretch my EGR and MAP clean out to 20,000 kms, (that would be where your mechanic would be heading I'd say) for me about every 4th oil change
A catch can is a definite assistance to keeping the whole intake system a bit cleaner...no brainer really.
Manufacturers won't include a catch can system usually because it is one more thing that can go wrong if an owner is oblivious to it and never empties it, until the engine eventually begins to choke as oil gets sucked from an overfull catch can in to the inlet....that's besides the few bob extra to fit them that consumers won't happily pay.
The trade off is oily blow by gunk being sucked in to the inlet manifold mixing with hot gases from the EGR and coating everything in tar...great idea eh!
The only way to keep a modern diesel running as reliably as is possible is to ensure regular oil changes...in the good old days diesels required oil and filter changes at least every 5,000 kms. Yet these days with engines choked up with every conceivable bolt on to make them "cleaner", albeit far less efficient, car manufacturers tell the buyers to only service these engine at half what it used to be or even quarter!
Stop start motoring kills the engines, constant cold starts are the enemy as the oil drains off journals and cylinder walls leaving them exposed to much faster wear. I read somewhere that 72 hours between starts is the line apparently after which wear can increase dramatically due to oil drain off.
2014 Jeep Grand Cherokee Laredo CRD
