Question about 1991 Nissan Pickup

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Poor milage 75000 miles      runs good    4 cylinder   auto trans       14mpg no matter driving conditions     diagnosis says sensors working        passes pollution tests

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Nap Z engine is a venerable work horse using dual ignition design but wont get much better mileage than you are experiencing now ... try larger tires..more air pressure. premium fuel every 10th tank full (unocal 76 , 91 octane).....free flowing air filter (K&N ) hotter spark plugs ..indexed prefereably...timing advanced slightly..tailgate down or install topper or tonneau bed cover... check jet chips or other co. for performance computer upgrade...good luck

Posted on Dec 02, 2008

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Tansmission slips


When you say the trans fluid is fine, is it a clear reddish color? does it smell burnt? also does your check engine light come on at all? how many miles are on the car? GM usually recommends a trans fluid flush at 100k miles under normal driving conditions and at 60k miles under more severe driving conditions. it sounds like there may be an internal problem with the bands or the pressure may be low. I would recommend taking the car to GM dealer for a better diagnosis as it sounds like it will continue to slip when it gets to normal operating temperature and it will get worse in the future. another option is to add 2 bottles of Lucas trans fix (48 ounces total) to the trans fluid but you will need to pump out that much fluid if the trans fluid is already full so you don't over fill it. the lucas trans fluid additive does work pretty good unless their is serious internal damage already done. Good luck!

Apr 17, 2014 | 2005 Pontiac Bonneville

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Poor gas milage?


Thinking you are getting poor gas milage,Your engine is running smooth,no misses,Engine runs smooth while accelerating up a hill, Still poor gas milage, Check your tire pressure. I have a 1999 Chevy Blazer 4x4, 4.3 Ltr. Auto, loaded. I have just over 154000 miles on it,I change my fluids every 5000 miles. Summer driving milage got real bad. I drive a Blazer hard. I tow a 16ft trailor usally loaded to the top with wood. Tires get hot in the summer, while in the winter, they stay mostly cool. Always check your air pressure.Most vehicals are equipted with radials now days, So if you think a tire looks low, check it, Usally they low. Usally in the winter months, nobody checks tire pressure. It really does make a difference. I went from 17.2 MPG to 19.5 MPG, while pulling the same trailor loaded with wood. I cut my own wood then stack it in my trailor to sell. I have Good Year Wranglers size: P235/75R/15 I just replace these with new ones. The old ones are going on my trailor. Counted milage on tires are 65000 Miles. Tires were rated at 40000 miles, Under normal use.

on Jan 01, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

I have a 95 f150 and it has a tendency to idle at 1100 rpms in park. i clean the idle position sensor and that didnt help. also it seems like it has no power when i drive it and i'm not getting very good...


symtoms of a bad coolant sensor. poor idle, stalling, rich mixture, retarded timing, low idle speed, cold hesitation or stumble, poor fuel milage. ( will also ****** timing ). in some cases you can unplug sensor and the pcm will compensate by running a default air/fuel ratio and in some cases allowing car to run without the sensor.Id just replace it !! if light is on, get vehicle scanned to find problem code. most all auto parts stores will scan for free, auto-zone etc. have a good day !!

Mar 25, 2011 | 1995 Ford F150 Styleside Regular Cab

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Automatic trans 1990 1.8gl drive chain tensioner hold down tab bent lost differential oil into bell housing . Tensioner o ring exposed and tensioner turns free with no feel of tightening chain.Car was...


Hi Kechly,
I'm a bit confused as to what exactly happened with your vehicle. What drive chain tensioned are you talking about? I believe the engine in your vehicle uses a timing belt. As far as my knowledge extends, I don't know of any chain in the drive. If the differential has run dry that will result in a rumbling sound which comes from worn or damaged bearings. I would advise you begin by inspecting those. If the vehicle is able to move at speed then it would seem that the auto box isn't being affected by the fault. Some clarification regarding your fault would help a correct diagnosis.
Regards Johngee10

Mar 03, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

Have a 1999 dodge dakota sport 4 wheel drive with a 5.2 liter motor 158,000 miles my problem is every 3 or 4 days when i go to start it it in the morning will not start after about 5 or 6 times cranking...


a vehicles crank shaft sensor sends a signal to computer, as to tell what revolution the crank is on. you may not get a check engine light. check injectors for leaking in to cylinders, it can cause an excess amount of fuel in cylinder. this may be causeing the no starts and flooding smell. if it starts good warm then check the injectors for leaking. good-luck!! you may also have a bad coolant tempurature sensor. symtoms of a bad cts are--poor cold idle, stalling, slow idle speed, cold hesitation or stumble, poor fuel milage. ( will also ****** timing). its hard to say with out being there, so check out above. good- luck!!

Oct 26, 2010 | 1999 Dodge Dakota

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Check engine light on; Gas milage went from 19 to 15, emission ba


YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.

Apr 20, 2010 | 1991 Mazda B-Series

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About how much is a 1986 toyota pickup 4x4 worth


Depends on milage, and condition. I got an '89 short box, regular cab, 4 cylinder with NO rust at all, but over 200,000 miles. I paid just over three thousand, as the odometer read that it had 84,000 miles on it. So I got a raw deal there, but the truck is clean, so I rebuilt the entire drive line, engine, transmission, rear end, transfercase, and on. Now I have a rust free solid good running truck for under seven thousand, that runs like new. But...I do have a lot of time in it.
I love the truck, they are well built, just prone to rust.

Jan 30, 2010 | 1986 Toyota Xtracab

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1996 Ford F 150, get only 12-13 mpg.Highway with no load. Has the 4.9L inline 6. with auto trans. & overdrive. Does not trip any trouble codes and all ox. sensors checked out ok. Is this just the...


You might try replacing the thermostat. Hows the heater work? That will give you a clue. A stuck or defective thermostat will cause poor fuel mileage and poor heater performance. This vehicle needs a
192-195 degree thermostat to operate correctly.

Sep 25, 2009 | 1996 Ford F150 Regular Cab

1 Answer

1993 GMC 1500 4x4 poor shifting


this may be due to a poor connection at the vehicle speed sensor on the transmission, pull the connector off the sensor and clean it with contact cleaner, if the problem persists replace the speed sensor. there are 2 diff ones here is a picture of the most common one for an auto trans.3deea43.jpg

Mar 26, 2009 | 1993 GMC Sierra K1500

1 Answer

Poor gas milage


Not sure where you live but if the gas you get has a higher amount of ethanol in it you will get worse gas milage.But there are many reasons that effect gas millage.

Nov 24, 2008 | 2004 GMC Canyon

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