increased mileage with deleted EHM

barley00 · **Posted:** Mon Jul 01, 2013 3:54 pm

I just deleted my EHM because of highly adverse smells coming from the EHM. I intended to just do it in order to figure out definitively where the smell was coming from. Smelled like burnt oil. This was all after I had some white smoke issues coming from my exhaust after driving through rain puddles on a low fuel tank...some suggested it was my EHM so I decided to go through a process of elimination to figure it out...

Anyway, since deleting my EHM I have noticed a 10% increase in fuel mileage.

Any ideas why this might be? I'm also wondering if I finally got to summer mix diesel at the station?

Would be interested to hear thoughts.

airwerks · **Posted:** Mon Jul 01, 2013 8:39 pm

I'll be curious to see what others post, but I noticed absolutely no difference in fuel mileage when I did the EHM. I track my mileage every tank too.

DocB · **Posted:** Tue Jul 02, 2013 12:26 am

When you say "deleted" the EHM, do you mean you stuck the hose from the PCV puck back into the turbo inlet hose?

geordi · **Posted:** Tue Jul 02, 2013 1:07 am

I saw no change in mileage either. It might be odd that summer diesel took that long to get to you, but that could be. Might also be that you got a better batch of fuel overall - sometimes I get diesel at particular stations and I can just about feel the increased power right away. Those tend to be the best tanks.

I generally don't use any additives, if I knew for certain (scientifically) that stuff like Howes made a difference, I would happily use it.

airwerks · **Posted:** Tue Jul 02, 2013 1:48 am

Edit, I'm retarded......

DOC4444 · **Posted:** Tue Jul 02, 2013 7:40 am

I am concerned about the white smoke out the exhaust. This occurs when the crankcase is pressurized. We have seen this when people have done the mod incorrectly or their breather hose has frozen shut in winter. If you inadvertantly sealed your your crankcase, it would make sense that your mileage could increase after fixing that. Hope you did not blow out your rear main seal. A properly done EHM is important because the stock system closes at higher rpm, just when you would NOT want it to. (Geordi figured that out, I believe.)

DOC

barley00 · **Posted:** Tue Jul 02, 2013 6:58 pm

Doc, I had the ehm going for several years and suddenly saw white smoke one day when I drive through some substantial puddles during one of our many downpours of late. I posted about this and a couple folks suggested clogged ehm. Although I could see exhaust coming out of the ehm I decided to try and evaluate the situation and plug it back into the turbo inlet. I was also getting some adverse smells, like burning oil so wanted to figure out if that was also due to the ehm. After all this I see that my mileage has gone up, so thought I'd pose the question. I usually get about 125 miles before the needle hits 3/4 tank so I could tell pretty early. I am on the 2nd tank since this "unmod" and I am at 150 miles (20% increase) on the current tank. The white smoke went away when I refilled the fuel tank because I was also low on fuel at the time...I've only seen the white smoke one more time since and that was after driving through a bunch of water again.

geordi · **Posted:** Tue Jul 02, 2013 8:20 pm

DOC4444 wrote:

A properly done EHM is important because the stock system closes at higher rpm, just when you would NOT want it to. (Geordi figured that out, I believe.)
DOC

Yup, that would be me. Another of Mopar's questionable changes, I'm sure.

Barley - The white smoke could have a very simple explanation, since it only happens when you hit puddles. I'm going to make an assumption that your engine was warm and that it had been raining, yes?

How about white smoke is steam from the hot exhaust at the catalytic converter, since that can easily be 500 degrees or more if you haven't removed it, or from the brake discs?

When you hear hoofbeats, it probably isn't mastodons....

DOC4444 · **Posted:** Tue Jul 02, 2013 10:03 pm

See if your airbox has water in it. If you have had EHM for years and only now you are having noxious smells, obviously something new is going on that you need to figure out.

DOC

increased mileage with deleted EHM

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