Last post on Feb 04, 2012 at 8:25 AM
You are in the Nissan Titan
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Nissan Frontier, Nissan Titan, Truck
#302 of 485 Re: Decreased mpg in 1993 Nissan Pickup [tony1958]
Sep 16, 2006 (9:25 pm)
I have a 2001 Nissan Frontier 3.3L S/C; adding a cold air intake gives around 4 mpg and an intercooler can give up to ten mpg. Also after adding cyclone's mpg improver I was getting about 26-28 mpg. I run my engine on full synthetic high torque/high RPM engine oil and have enjoyed the effects. I have done some minor exhaust work and my mileage went down accordingly, along with working on the headers. I am adding an underglow kit here soon when I get the money for it, but with the performance mods my mileage has dropped to 21 or so. Then again I also tuned up the supercharger which close to doubled the output when I changed the throttle body (also adding a throttle body spacer -- which should increase gas about mileage 2 mpg) chandeg out the Air Pressure Reg. and the S/C fan. And probably a week ago I changed out the gearing from the belt to the S/C and am greatly impressed with the output.... though I am nervous about gas mileage.
#303 of 485 Re: Decreased mpg in 1993 Nissan Pickup [badness]
Sep 16, 2006 (9:28 pm)
Ethanol decreases engine output but not MPG.
#304 of 485 Re: 1998 XE - "Clattering" sounds... [gkolman]
Sep 16, 2006 (9:30 pm)
Add a SMALL amount of water to the clutch and drive for the ussual span of time when you hear the noise. the water should add enough lube to the clutch that you will no longer hear the noise... at least for that short period of time. If you do not hear it like you ussually do it is probably the clutch, which you can replace at little cost, or you could add a faster engaging clutch which could increase gas mileage and faster engagement with less stutter. good luck.
#305 of 485 Re: Decreased mpg in 1993 Nissan Pickup [thol]
Sep 17, 2006 (5:34 pm)
This is something I've not had checked and the mechanic didn't suggest it. I'll call tomorrow and find out. I've never gotten a check engine light with this and the computer has not shown an error code. It's worth checking out though. Thanks for the suggestion.
#306 of 485 Re: Decreased mpg in 1993 Nissan Pickup [tony1958]
Sep 17, 2006 (7:39 pm)
I have a 1997 pickup and I just bought it.I am only getting 17mpg on the 4cyl.I specifically bought this for the mileage.I also am getting now codes from the check engine light.What should I try.Sorry to hijack your question but I figure its on the same topic.
#307 of 485 Re: Decreased mpg in 1993 Nissan Pickup [cruarkawd]
Sep 18, 2006 (12:07 pm)
Just got a call from the dealership after soliciting their opinion on whether the fuel pressure regulator might be the culprit for the decreased gas mileage. They didn't think so, but wouldn't rule it out. One of the mechanics suggested it might be the Emission Gas Return (EGR) valve that supposedly takes unburned fuel (as vapors, I guess) and returns it to be used again. Certainly not sure I have this right. Any thoughts on whether a malfunctioning EGR valve could cause a decline in gas mileage?
#308 of 485 Alternator not charging
Sep 18, 2006 (9:06 pm)
1998 Frontier XE 4x4 4 cyl. Manual transmission that does not read a charge coming from the alternator. Had the alternator tested at an automotive store and it tested good, but when put back into the vehicle there is still no charge being read at the battery.
The problem arose shortly after I noticed frost on the inside of the windshield and defrosted it, but did not wipe all the water off and some drained down into the dashboard. I then noticed the windsheild wipers were much slower, this went on for a week or about 50 - 75 miles of driving (mostly at daylight) then one day when the truck needed a jump start, realized the alternator must be failing. But like I said earlier, when I pulled it and took it in to be tested, it tested fine and when reinstalled it measured while running a slow but steadily diminishing 12v at the battery posts.
Continuity test show the cables coming off the big terminal on the alternator as good and the ground cable coming off the alternator as good.
Could it be something under the dash? But what?
#309 of 485 Re: Decreased mpg in 1993 Nissan Pickup [tony1958]
Sep 19, 2006 (5:56 am)
The EGR takes the exhaust gas that will no longer burn and recirculates it so that it can be used as displacement in the cylinder. It cuts output of the engine but it increases MPG as you are using less heat in the reaction due to less of an explosion in the cyl.
#310 of 485 2000 Nissan Frontier, 5 speed manual
Sep 26, 2006 (11:34 am)
#311 of 485 2000 Nissan Frontier, 5 speed manual cont.
Sep 26, 2006 (11:38 am)
When I'm shifting into gears, there seems to be a knock or a "groan" when I'm releasing the clutch. Seems to do it going into every gear. I want to make sure nothing is loose. The clutch doesn't slip when it's fully engaged? Anyone else with this strange noise? I just bought the truck, and I'm trying to make sure everything is good to go.