EGR and engine failure?

Yeah I call BS on this: they all clog.

 

+1.

I regularly (as in everyday) drive 65-70 mph for 30 minutes and I have cleaned the circuit twice.

But I know how to do the job through practice .

 

Assuming no need to clean, just parts swap, how long does it take you now? I'm guessing under 3 hours. You leave that lower cooler nut off?

 

Under 3 hours, if only .

My best is 5 hours and that is with 2 sets of experienced hands assisting.

But I have been accused in the past of not being the sharpest knife in the drawer.

But I do leave the cooler nut off.

 

I probably take 3 hours getting the windshield cowl off and everything back together. And that's just an appetizer.

 

I’m including pre and post work like splash shield removal and replacement in the time quote.

That windshield wiper cowling is definitely in your craw .

10 minute disassembly and 15 minute reassembly due to usually putting one but in an incorrect spot leading to rework .

But not too bad overall .

 

In other EGR systems the problem is low temperatures. Also, wouldn't the change to post-cat supply raise the gas temperature? It would certainly cut down on the unburned hydrocarbon content, so less latent fuel in the EGR...

The big difference in my mind is that a pre-cat EGR source allows the engine to actually use some of the recovered HC in the exhaust, the post-cat system sacrifices that but gains hotter, more stable EGR flow temps with less random garbage in it.

 

Lot of info there, thanks.

The 4th gen EGR cooler is a different shape too. It'd be nice to be a fly-on-the-wall in the engineer meetings.

 

congrats!

 

I presume they only replaced valve and that they didn't replace or clean the cooler?

 

i just experience the same thing as this one.

 

Can you provide more information?