SantaCruz163 Posted April 5, 2007 Share Posted April 5, 2007 (edited) I'm been getting like 10MPG and it's starting to piss me off. I replaced the O2 sensors after the cat, air filter, plugs, wires, oil change; and my mileage hasn't gotten any better. I used Bosch O2 sensors and I have mxed feelings about them. Dealer OEM sensors are ~$195 each but I don't want to drop that kind of money on 4 sensors if it's not going to make a difference. What should I try to get my mileage up? I don't drive with a heavy foot. I skip shift a lot of the time. I plan on getting Warn hubs soon to free up some rotating mass on the front end, hopefully get some mileage back that way. What else can I do? Edited April 5, 2007 by SantaCruz163 Link to comment Share on other sites More sharing options...
blamtro Posted April 5, 2007 Share Posted April 5, 2007 Your signature says you are running 31" tires, but what gears are in your axles? You should have the 4.636, if you have the 4.363, that will hurt MPG. Have you replaced the coolant temp sensor for the ECU? Condition of Spark plugs? Link to comment Share on other sites More sharing options...
nissandoms47 Posted April 5, 2007 Share Posted April 5, 2007 i have 32s with 4.3s and get 15 city and 17-18 hwy. check for intake/exhaust leaks. If you have an exhaust leak before the rear 02 sensor and after the front 02 sensor then it will think its running lean by the extra oxygen being fed into the system, hence more fuel to try to level it out. and any intake leaks after the MAF sensor. and some vacuum leaks etc can do that. Link to comment Share on other sites More sharing options...
88pathoffroad Posted April 5, 2007 Share Posted April 5, 2007 The Warn hubs seem to be a fairly inexpensive way to reliably increase MPG's as far as I've seen. With today's prices on gas, I would think that the cost of the hubs will come back to you in the MPG savings pretty quickly. Link to comment Share on other sites More sharing options...
SantaCruz163 Posted April 5, 2007 Author Share Posted April 5, 2007 i have 32s with 4.3s and get 15 city and 17-18 hwy. check for intake/exhaust leaks. If you have an exhaust leak before the rear 02 sensor and after the front 02 sensor then it will think its running lean by the extra oxygen being fed into the system, hence more fuel to try to level it out. and any intake leaks after the MAF sensor. and some vacuum leaks etc can do that. I do actually have a small exhaust leak, right at the O2 bung on the driver side after cat sensor. When replacing them, the old sensor would not come out nice so it basically destroyed the threads. I ened up welding on a nut to replace the bung and I must of missed a small area. I didn't realize that would kill my mileage that badly. My gears are what ever stock gears are in a SE model. With highway driving bigger tires with stock gearing should give you better mileage. Link to comment Share on other sites More sharing options...
Simon Posted April 5, 2007 Share Posted April 5, 2007 With highway driving bigger tires with stock gearing should give you better mileage. Negligible. The extra weight of the tires, even at highway speeds usually eats that up. NOt to mention, the extra friction from typically wider tires as well. When I upsized, I was happy to simply not LOSE highway mileage. Link to comment Share on other sites More sharing options...
SantaCruz163 Posted April 5, 2007 Author Share Posted April 5, 2007 I seriously doubt having 31" A/Ts is going to kill my mileage this dramatically. I'll have to reweld the O2 bung to fix that leak and maybe just bite the bullet and replace the O2s with OEM ones... Is there a dealership or an online store that sells OEM parts at a whole sale price and not at a typical stealership mark-up price? Link to comment Share on other sites More sharing options...
Simon Posted April 5, 2007 Share Posted April 5, 2007 No.....I'm not saying they will..... Exhaust leak is most likely your issue. Link to comment Share on other sites More sharing options...
CALPATHY Posted April 6, 2007 Share Posted April 6, 2007 i have 32s with 4.3s and get 15 city and 17-18 hwy. check for intake/exhaust leaks. If you have an exhaust leak before the rear 02 sensor and after the front 02 sensor then it will think its running lean by the extra oxygen being fed into the system, hence more fuel to try to level it out. and any intake leaks after the MAF sensor. and some vacuum leaks etc can do that. I get the same mileage with 31s. I just installed the Warn hubs, but haven't gone through a full tank yet to find out if it helped. It sure coasts better with the Warns and seems to be a little quieter. Link to comment Share on other sites More sharing options...
AssBeard Posted April 18, 2007 Share Posted April 18, 2007 I have about 124K miles on mine, along with a significant passenger side exhaust manifold crack/leak. I get about 14.3 mpg in the city. I noticed a significant improvement when I removed my roof rack, and an insignificant improvement when I removed my spare tire and swing gate off the rear. I'm hoping to see an improvement once I finally get the dough to replace that exhaust manifold leak. Link to comment Share on other sites More sharing options...
CALPATHY Posted April 20, 2007 Share Posted April 20, 2007 I finallyput some highway miles on my recently installed Warn hubs and my gas mileage went from 18 to 20.6, with the hubs unlocked, of course. Link to comment Share on other sites More sharing options...
Gripenfelter Posted April 20, 2007 Share Posted April 20, 2007 Clean your MAF sensor. Link to comment Share on other sites More sharing options...
lee_cha_nin Posted April 21, 2007 Share Posted April 21, 2007 2001 XE , 157 000 km, 18 lit/100 (13 MPG), mostly city driving though - changed air filter - put Lucas inj. cleaner several times - did inj. cleaning service - regular oil change (every 3 months) ---> and still no way to bring the consumption down. What else to do? Link to comment Share on other sites More sharing options...
NismoSkyZ Posted April 22, 2007 Share Posted April 22, 2007 Try to shift at 3000 rpm. Keep your RPM's between the 2k to 3k range, except when in fifth going over 55. Also, just do some maintenance like changing the plugs and wires, cap and rotor, air filter, fuel filter, make sure there is adequate air in the tires, change the oil if its over, use some injector cleaner...the list goes on and on. Link to comment Share on other sites More sharing options...
lee_cha_nin Posted April 22, 2007 Share Posted April 22, 2007 Just found this thread on another forum, talking about MAF sensor and O2 sensor. http://forums.nicoclub.com/zerothread?id=2...;postid=2560946 Link to comment Share on other sites More sharing options...
AssBeard Posted May 18, 2007 Share Posted May 18, 2007 I am going to try the MAF sensor cleaning this weekend. I will let you all know if it helps as soon as I button up the front and start driving it again (I am currently doing a bumper trim swap). Link to comment Share on other sites More sharing options...
bryfry Posted May 20, 2007 Share Posted May 20, 2007 (edited) Denso makes the better OE style O2 sensors. They can be hard to find in some areas though. Never had much luck with the Bosch on Japanese vehicles. They consolidate too many numbers. NTK s also another decent OE type sensor. This is the same company as NGK plugs. Denso #'s: Frt Left: 234-3097 Frt Rght: 234-3087 Rr Left: 234-4703 Rr Rght: 234-4704 NTK #'s: Frt Left: 24526 Frt Rght: 24521 Rr Left: 24543 Rr rght:24544 The Denso's usually run about $65-75 US. Make sure you clean the MAF with proper cleaner. CRC products makes one. Edited May 20, 2007 by bryfry Link to comment Share on other sites More sharing options...
gtrotta Posted May 20, 2007 Share Posted May 20, 2007 My mechanic says another possible culprit could be the fan clutch -- if it doesn't disengage, it will keep engine needlessly working hard. Quote was $200 to replace; might be worth it in gas. Best, GT Link to comment Share on other sites More sharing options...
bryfry Posted May 20, 2007 Share Posted May 20, 2007 Excellent point, qtrotta. There will be a distinct roar coming from your engine when those clutches are seized. Something to check out. With the engine shut off the fan clutch should spin somewhat free. If it is super hard to move, it probably is no good. Link to comment Share on other sites More sharing options...
csutke Posted May 20, 2007 Share Posted May 20, 2007 i had the same prob as you and i got mine up to 16.5(highway) 15(city). I had a leak that i got fixed and it made a huge difference, also ive got the K&N FIPK and that has helped as long as its clean. Like the others said check the plugs, wires, filters(air, fuel), TIRE PRESSURE, etc... Ive also got warn hubs and i noticed a little difference in MPG but the biggest difference was that it coasted a lot better and the other benefits of having them. Check out drivewire.com for the O2 sensors. Link to comment Share on other sites More sharing options...
AssBeard Posted May 20, 2007 Share Posted May 20, 2007 Well, I buttoned the front end back up and took a look at my MAF sensor. Man, that thing was dirty. No telling when it was cleaned last (or if it's ever been cleaned). I filled up yesterday and have started clocking mileage. I will keep you guys updated. Link to comment Share on other sites More sharing options...
SantaCruz163 Posted May 20, 2007 Author Share Posted May 20, 2007 I bought Denso O2 sensors, a Hastings PCV valve but haven't put them in it. I'll check my MAF and clean it out as needed when I put the new equipment in. Driver's side O2 looks like it's a going to be a real bitch. Passanger side not so bad. Any one have tips to make getting them out easier? I still need to weld the exhaust leak on the rear O2 bung. I did plugs, wires, air filter & fuel filter all within the last 4 months so I know those are alright. I really need new suspension too. I'm rolling on the factory stuff and it has about 150k miles. I was thinking about going with a cheaper AC 2" setup. Then, an alignment job & plastic airsoft BBs in the tires for a true balance. Finally, Warn manual hubs. Sidenote: Is it easy to take off the 'nose' of a R50? Having it off would make make doing timing belt, serpentine belts a breeze. Link to comment Share on other sites More sharing options...
jlg Posted May 21, 2007 Share Posted May 21, 2007 when you are on the highway just spot another truck/van and follow its tail Link to comment Share on other sites More sharing options...
AssBeard Posted May 21, 2007 Share Posted May 21, 2007 (edited) Sidenote: Is it easy to take off the 'nose' of a R50? Having it off would make make doing timing belt, serpentine belts a breeze. It is easy. For me it was easy-ish, but that's because I am almost useless as a wrench-turner. The hardest part was the nylon (hard white plastic) alignment/retainer clips on either side of the bumper, which was also the only thing the Haynes manual forgot to mention. They were pictured in the service manual, though I didn't think to check it until the job was already done. D'oh! Edited May 21, 2007 by AssBeard Link to comment Share on other sites More sharing options...
yar1 Posted May 23, 2007 Share Posted May 23, 2007 will di-electric grease work to clean the maf sensor? Link to comment Share on other sites More sharing options...
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