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Old 12-01-2019, 08:37 PM   #11
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I wonder if maybe the truck is burning some oil or something that’s causing this? That or maybe it it needs a tune up or the timing is off and it just isn’t burning the fuel efficiently?
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Old 12-06-2019, 11:34 AM   #12
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here is something i know
my 95 4cyl standard trans hold 3.75 quarts of oil
my 97 4cyl auto trans hold 3.50 quarts of oil

last timed i changed oil in the 97 i put 3.75 quarts of oil and the dipstick shows its full just above the H.

so im wondering if that is the issue

or it was all the super unleaded i ran thru the truck for about 25,000 miles

*when i bought truck it had wrong plugs-wires-oil filter in it*
*so i fixed that and it drove great for 3 years i just keep getting a clogged egr valve bypass hose*

No oil burning that i see
Engine runs great
Thinking of killing off the egr---no smog test here
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Old 12-06-2019, 01:35 PM   #13
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Higher octane fuel will not cause an issue.
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Old 12-06-2019, 07:12 PM   #14
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remember kids, the higher the octane rating, the LESS flammable it is.

Regular = Flammable
Super = Less Flammable
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Old 12-07-2019, 01:49 AM   #15
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Quote:
Originally Posted by Jimmy_the_cow View Post
remember kids, the higher the octane rating, the LESS flammable it is.

Regular = Flammable
Super = Less Flammable
That seems counter-intuitive, help me understand, please
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Old 12-07-2019, 06:55 AM   #16
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Quote:
Originally Posted by nunya View Post
That seems counter-intuitive, help me understand, please
To simplify... High compression and High boost engines need High octane fuel.

This is because Low octane fuel "detonates" or "pre-ignites" before the spark plug does its thing.

So, to prevent "detonation" you Increase octane... IE run super, because Super is LESS flammable than regular.

Big turbo guys that need to increase "octane" on the fly do water or methanol injection to prevent detonation...

Like how people say "Jet fuel" super flammable... blah blah blah...

Its just kerosene basically, its actually pretty hard to ignite.

I work in the petroleum industry.. I can go on and on about fuel lol

hope that helps?
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Old 12-07-2019, 06:56 AM   #17
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Quote:
Originally Posted by Deerhurst View Post
Higher octane fuel will not cause an issue.
higher octane fuel is essentially unburnt fuel if its used in an engine designed for lower octane fuel. That unburnt fuel is going to gum up a lot of stuff over time.
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Old 12-07-2019, 08:32 AM   #18
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Quote:
Originally Posted by etx97xe View Post
here is something i know
my 95 4cyl standard trans hold 3.75 quarts of oil
my 97 4cyl auto trans hold 3.50 quarts of oil

last timed i changed oil in the 97 i put 3.75 quarts of oil and the dipstick shows its full just above the H.

so im wondering if that is the issue

or it was all the super unleaded i ran thru the truck for about 25,000 miles

*when i bought truck it had wrong plugs-wires-oil filter in it*
*so i fixed that and it drove great for 3 years i just keep getting a clogged egr valve bypass hose*

No oil burning that i see
Engine runs great
Thinking of killing off the egr---no smog test here
I have a 97 as well. Manual, four banger. This sounds more like an incomplete fuel burning issue. Too much unburned fuel going into the exhaust.

The best way to check for possible oil burning is to wait until your exhaust pipe is absolutely cold, and then take your finger and shove it up the tailpipe and wipe it around a few times. Do you come away with black powder, completely dry? Unburned fuel. Do you come away with anything at all that is black and WET? Oil burning.

A little black powder is normal. A LOT of it and you have unburned fuel going. And if you find it in the tailpipe, you will really find it in the EGR. Here are some things you can do:

If you have factory wire clamps on any of your air hoses, replace them with modern screw clamps.

Go to next hotter range of spark plug. Just one step. Don't go crazy with it.

Don't buy too much cheap ethanol-added fuel from strange sources. Ethanol added fuel isn't like regular gas. ANY exposure to the atmosphere and it will suck up water from the atmosphere like a damn magnet. I had this problem with Fred Meyer gas until they switched suppliers. Major fuel suppliers, such as Chevron, are no problem. They know how to handle ethanol added fuel. Some cheap ass fuel distributors don't, and they expose the fuel to the air too much during the transport and delivery process. Running problems not so much in newer vehicles, but a NIGHTMARE for older cars.

Plugs, wires, cap, rotor, air filter...okay to go cheap on the air filter, but not on the other stuff. Upgrade especially those spark plug wires.

I add a full quart of Hilton's Hyper Lube to my oil before I put in the REGULAR oil. This stuff works. I did a famous test of it over the period of a year and four oil changes and published the results to this site. Somewhere...LOL. Lucas Oil Additive is shit compared to Hiltons. If you pull your valve cover, you can feel around the camshaft and there will always be a honey-like coating. When I dropped my oil pan, the bearings were like new and the pan clean as a whistle.

Make sure timing is absolutely, 100 percent dead on target.

My favorite fuel is Chevron Supreme. Now...I do all these things and I have done a mileage check. Currently, the Teal Terror (that's a joke) gets 27.5 MPG combined, city/highway. Highway alone it has to be getting about thirty a gallon. This could be a record. Take a look at that truck below. Look at all the drag...king cab, bigger tires/wheels (15 inch) that wind-catching Lund sunshade above the windshield, the bug shield too. The canopy. Lot of drag, but still gets amazing mileage.

The only weird thing is the speedo reads TWO miles above what you are actually going, because of the fifteen inch tires and wheels. Keeps me out of trouble though. When speedo says 27 you are actually going 25. Confirmed a bunch of times passing those radar speed signs.
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Last edited by XoXSciFiGuy; 12-07-2019 at 08:39 AM.
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Old 12-07-2019, 01:14 PM   #19
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Im gonna buy another egr valve.

My nissan one works but is now 22 years old and has been cleaned three times now.

Figure maybe its just sticking from time to time?


My exhaust is fine. Normal No oil burning or smoke.

Wondering this. I use valvoline 5w-30 per nissan. Wondering if i need to switch too 10w-30 like i use in my 95 4cyl manual trans.

I know this since i have owned this 97 truck now fro almost 4 years it has had a issued with the egr valve. I replaced the mushroom head-foam part above the egr valve, but just cleaned the egr.

So im gonna buy a new egr and see if it stops my issues.
I was told by local nissan mechanic the egr tube is know too clog. The tiny hole is too small. Well i made it slightly bigger. Wondering if this made it worse. Mechanic claimed Nissan bores out hole in tube when they replace the egr.

Anyway. Runs fine for now. Im also back to 87 octane gas. So will wait and see how long it takes before check engine light comes on.

I bet the egr valve is old and sticking...
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Old 12-09-2019, 03:37 PM   #20
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10% ethanol fuel is most likely the culprit to the clogging EGR. Unless your area doesnt have that as an option. Ever since Texas starting offering 10% ethnol fuel, I had issue with this very thing. Not to mention the lower MPG's. They say that ethanol fuel is harder on older vehicles with the EGR systems.
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