EGR observation - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 01-07-2008
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EGR observation

I've noticed that when temps get COLD the EGR stops working. I wonder at what ambient temp it stops?

I reckon this is partly why we see lower mileage in the cold. Just an interesting observation....

Rich
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Old 01-07-2008
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Huh, thats odd... What about the 03's though, they don't have an EGR and they still get lower mileage in the cold. I always thought that it was the "winter" gas...
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Old 01-07-2008
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Take note.. I said "partly" the reason. Like most things in life it's a combination of factors.

I hadn't noticed this until I put the scanguage in. It's something I've been watching lately.

Rich
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Old 01-07-2008
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H2O in the exhaust can cause icing in the EGR system. I believe that many older calibrations (pre-OBDII) simply turned off the EGR before intake temps could fall to or below 32F. The OBDII cals allow the EGR system to continue to operate at below freezing ambients but will shut it down if a fault is detected.

The following is from the EGR section of Ford's OBDII Theory & Operation.

Quote:
Note: EGR normally has large amounts of water vapor that are the result of the engine combustion process. During
cold ambient temperatures, under some circumstances, water vapor can freeze in the DPFE sensor, hoses, as
well as other components in the EGR system. In order to prevent MIL illumination for temporary freezing, the
following logic is used:

If an EGR system malfunction is detected above 32F, the EGR system and the EGR monitor is disabled for the
current driving cycle. A DTC is stored and the MIL is illuminated if the malfunction has been detected on two
consecutive driving cycles.

If an EGR system malfunction is detected below 32F, only the EGR system is disabled for the current driving
cycle. A DTC is not stored and the I/M readiness status for the EGR monitor will not change. The EGR monitor,
however, will continue to operate. If the EGR monitor determined that the malfunction is no longer present (i.e., the
ice melts), the EGR system will be enabled and normal system operation will be restored.
The noticeable reduction in fuel economy in winter is mostly due to greater cold enrichment, longer warmup duration, higher friction and, in some regions, oxygenated fuels. I don't think that you can attribute much to the EGR shutting down. Its contribution to fuel economy is very small from a consumer's perspective but can sometimes be meaningful for CAFE numbers.
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Old 01-07-2008
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Thanks for the input Bob.

I've been under the impression that a non working or disconnected EGR will decrease MPG. And that's what I've observed too. Maybe it's not the root cause though...

Rich
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Old 01-07-2008
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Quote:
Originally Posted by wydopnthrtl
Thanks for the input Bob.

I've been under the impression that a non working or disconnected EGR will decrease MPG. And that's what I've observed too. Maybe it's not the root cause though...

Rich
It will make a small difference because there is a spark adder when EGR is active. Probably only on the order of 0.1 MPG or so difference though.
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Old 01-07-2008
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i am so glad my truck does not have this system!
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Old 01-07-2008
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how can you tell with the scangauge that the EGR is open or closed? I just got mine this morning. so i am just learning

but mine is an 03 so i dont expect to know with mine.
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  #9  
Old 01-07-2008
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you look at the DPFE sensor. closed it should read .99 volts. fully open will show 4.5-5 volts
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Old 01-08-2008
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Its in the Xguage commands.. you program it in.

Rich
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Old 01-08-2008
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ah I see. How many things have you programmed in?
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Old 01-08-2008
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5 or 6 so far.

IMO the only thing I am disappointed with is the refresh speed when looking at the 02s. I'll have to use the x-cal & data log to capture the specific info I'm needing. Otherwise it's nice to have this scanguage w/me 24/7 (I'm also ordering an extra cable so I can use it to look at other cars)

Rich
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Old 01-08-2008
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are we able to get tranny temp? 02s would be great too. I really need to read that add-a-guage thing on the web tonight
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Old 01-08-2008
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Oh yeah.. matter of fact I'd not have bought one if I couldn't measure tranny temps. That was one of my main reasons for buying one.

Rich
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  #15  
Old 01-08-2008
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personally. i think this "Xgauge" is over priced for what it does.

i have a matco scanner that does all the same things and more, just cant mount it, nor do i want to. it shows "real" data and records it.
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Old 01-08-2008
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Overpriced... oh I don't really think so. One thing it's "not" is a true diagnostic tool. That I'll give you. But having the ability to read data live as you drive down the road, read & clear DTCs, and have the ability to use it on other cars is worth the cost. To me anyway.

I sold my autotap so I could get one. So far I'm happy with it. Would not have done it w/o having the SCT x-cal as a backup though.

Rich
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