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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 6 MPG, out of ideas, please help.

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Unread 06-10-2013, 07:36 AM   #256
wjjeepman34
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Quote:
Originally Posted by NW4wheeler View Post
Calculated 17 mpg going over the pass last week.everyone that says that a wj doesn't get 20mpg needs to just shut up and find out what's wrong with thier rig. I was talking with another tech the other day and he suggested if you have worn o2s the comp will turn on the o2 sensors heater for longer and longer intervols. He said that needs to be reset because when you install new o2s then the computer is still sending out such a long o2 heater signal it will either 1. Burn out the new 02s or 2. Make the new o2 act just like the old one because its heater is on for to long. I hooked uo the motis to the jeep last week and could not find this option. Maybe someone with an drb3 or veris can chime in.
Hell, I've never seen 17 mpg's since I bought the jeep in 07 with 40, 000 miles. And there hasn't been anything wrong with it, and I always keep up on regular maintenance. Must just be the way some people drive. I don't drive like a grandpa

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Unread 06-10-2013, 07:54 AM   #257
outofrng623
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I've had 16 and changed mixed driving. Only seen it once and double checked my math. Lol
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Unread 06-15-2013, 05:01 AM   #258
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Headlights done. For some reason with the led parking/marker/blinker bulbs in, my inner most bulbs do not light up until the blinker is used. I like it, but strikes me as odd.
image-3779772933.jpg   image-1600333662.jpg  
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Unread 06-15-2013, 05:54 AM   #259
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Good to hear you got this sorted out. I think 17mpg is reasonable, but keep in mind that 20mpg even though it doesn't sound like much more is almost a 20% improvement over 17. Depending on what type of driving you're doing to get the 17, 20 may or may not be within reach. Helluva lot better than 6mpg though!
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Unread 06-15-2013, 06:05 AM   #260
86cj74.2L
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Quote:
Originally Posted by lazyWJ
Good to hear you got this sorted out. I think 17mpg is reasonable, but keep in mind that 20mpg even though it doesn't sound like much more is almost a 20% improvement over 17. Depending on what type of driving you're doing to get the 17, 20 may or may not be within reach. Helluva lot better than 6mpg though!
Unless it goes back in the toilet next winter.........
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Unread 06-15-2013, 06:09 AM   #261
outofrng623
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Winter gas had me thinking and then it dawned on me. Once the weather got better, my mileage did as well. So I am wondering if the cold weather...is in fact cold enough, to cause a clogging cat to run worse...less heat to burn the exhaust in the cat. One more reason for me to think my cat (at least one side) is bad...
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Unread 06-15-2013, 06:10 AM   #262
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Unless it goes back in the toilet next winter.........
I was wondering if there was any correlation there. My mileage drops almost 20% from winter to summer. My best tank of gas for economy was just last week (bought jeep in december). Warm weather made a big difference.
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Unread 06-15-2013, 06:58 AM   #263
outofrng623
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Winter gas definitely burns different, but I think with a cat issue, the cold weather happens to make it that much worse.
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Unread 06-15-2013, 08:37 AM   #264
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So. Two fills after the new post cat o2s...slight difference. 2-3 Mpg. The two fills after that, we're big. I just had a 160ish mile drive mixed highway doing 70s, stop and go 55mph traffic and stop and go 2 mile crawl over an hr give or take and I got almost 16mpg.
Checked at Rock Auto, there is a huge price range on the O2 sensors.

DENSO Part # 2344746 downstream right: $21.79

ranging up to NTK Part # 23529 downstream right: $88.79

Any recommendations? Any difference other than price?
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Unread 06-15-2013, 08:52 AM   #265
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I've seen so many different things on here. Believe it or not, those densos I believe are not mopar specification densos, even though denso made them for mopar. I have densos precat and mopar post and I saw no reading differences going from old to new. But, when it comes to things like this for jeeps, I say get the mopar from the dealership (via your mechanic or yourself) and either instal it yourself or let the mechanic do it. But, do not let the dealership do it. They'll charge ya book time even if it takes them 15 minutes. I think my dealership is 110an hour and they charged an hour and a half for two.
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Unread 06-15-2013, 10:24 AM   #266
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Quote:
Originally Posted by lazyWJ

I was wondering if there was any correlation there. My mileage drops almost 20% from winter to summer. My best tank of gas for economy was just last week (bought jeep in december). Warm weather made a big difference.
Driving in winter time takes longer warmups. That by its self uses more fuel.
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Unread 06-15-2013, 10:57 AM   #267
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Originally Posted by outofrng623 View Post
I've seen so many different things on here. Believe it or not, those densos I believe are not mopar specification densos, even though denso made them for mopar. I have densos precat and mopar post and I saw no reading differences going from old to new. But, when it comes to things like this for jeeps, I say get the mopar from the dealership (via your mechanic or yourself) and either instal it yourself or let the mechanic do it. But, do not let the dealership do it. They'll charge ya book time even if it takes them 15 minutes. I think my dealership is 110an hour and they charged an hour and a half for two.
Hmmm - anybody have experience with Bosch? Rock Auto lists 2 different Bosch sensors. I want to get the right stuff but obviously don't want to throw $$$ away.
One is listed as OE style, the other is listed as OE Type - Exact Fit.
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Unread 06-15-2013, 01:21 PM   #268
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Trust me. Search o2s in the threads. Oem style does not have the same specs. Read around. I believe everyone says hell no to Bosch.
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Unread 06-15-2013, 04:01 PM   #269
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Trust me. Search o2s in the threads. Oem style does not have the same specs. Read around. I believe everyone says hell no to Bosch.
+100

My friend replaced a PCM because of a Bosch O2 sensor.

His truck was running bad. Put a Bosch in it. Still bad. Diagnostics said to replace PCM next. Ran the same. Then they found out he put a Bosch O2 in it. So they replaced it with a mopar and put the original PCM in and it was fixed. They still charged him for the new PCM and all the programing.
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Unread 06-15-2013, 05:37 PM   #270
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I find it amusing that with all the info that's gone on within this thread...everyone helping me, me posting results, etc...and apparently all we've learned and taught one another through this extremely lengthy and highly viewed thread...doesn't mean much.
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