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Old 09-03-2019, 05:10 AM   #121
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Quote:
Originally Posted by de-nagorg View Post
Starter fluid, is safer, but can still be dangerous.

Easier controlled, spray sparingly around the vacuum lines, using the little straw included on a WD40 can. and when the engine REVS , you have found a leak, now you visually inspect the lines well, to find a split one.

Replace it, run the test again, until you get them all.

ED
Man, that is the reason you make the big bucks, I never thought about that little straw, that would sure narrow it down a bit. Thanks buddy, I do appreciate that a lot. I will do just that. I will let you know how it goes.

It is amazing how mechanics have changed from the 60s to now. All that junk on an engine is just not necessary IMHO. Looking at today's cars and the 60's cars, kinda makes you wonder how in the world did those primitive things ran without all this crap they have now days. Heck, just look at the old Model T's and A's, how did they run without all this garbage on their engines back then. Sure makes today's auto makers look stupid if you ask me.

I use to hate with a passion to have to set the points and adjust the carbs, but man I would go back to that in an instant over all this crap today. They are going to mess around and come up with two sensors that will not work without the other and they are going to cancel each other out and render the engine useless.

If it has changed this much since the 6o's can you imagine in the next 50 years. We won't be around to see it but I feel for who ever is.
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Old 09-03-2019, 08:36 AM   #122
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Does anyone else realize that those cars in the late 50's-60's got just as good of mileage, and did not pollute, just like the modern ones with all the added garbage?

That is, if the owner kept them tuned correctly.

These Computers are supposed to adjust the tuning to accommodate for a lack of maintenance. by the modern lazy owners.

I still have my own Point File, and plug gapping set. Timing light, Dwell meter, and vacuum gauge.

All handy tuning tools.


ED
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Old 09-03-2019, 08:43 AM   #123
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Man, we have different memories. I LOVE all the new stuff. My first car was a 1966 Mustang with the 200 CID straight 6 with 1-barrel carb and auto trans. It was dog slow... zero to 60 in maybe 9 or 10 seconds... and perfectly tuned it got 17 highway mpg on a good day. Today my Vette does zero to 60 in about 3.5 seconds and gets 30 MPG highway.

That old stuff was way easier to work on, which was a good thing, because it needed to be worked on a lot.

Quote:
Originally Posted by de-nagorg View Post
Does anyone else realize that those cars in the late 50's-60's got just as good of mileage, and did not pollute, just like the modern ones with all the added garbage?

That is, if the owner kept them tuned correctly.

These Computers are supposed to adjust the tuning to accommodate for a lack of maintenance. by the modern lazy owners.

I still have my own Point File, and plug gapping set. Timing light, Dwell meter, and vacuum gauge.

All handy tuning tools.


ED
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Old 09-03-2019, 09:02 AM   #124
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


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Man, we have different memories. I LOVE all the new stuff. My first car was a 1966 Mustang with the 200 CID straight 6 with 1-barrel carb and auto trans. It was dog slow... zero to 60 in maybe 9 or 10 seconds... and perfectly tuned it got 17 highway mpg on a good day. Today my Vette does zero to 60 in about 3.5 seconds and gets 30 MPG highway.

That old stuff was way easier to work on, which was a good thing, because it needed to be worked on a lot.
I agree that the big block cars had to be worked on a lot but the small block engines hardly ever. At least back then if you had a problem it was extremely easy to pin point, and work on, not these things now days. I am starting to hate our Sentra.
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Old 09-03-2019, 09:09 AM   #125
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Agree... if you get a bad problem or lemon it can be a bear to figure out and put right. But by and large most modern vehicles are set it and forget it reliable, including the electronics.

We had a great 1964 Impala convertible with the 327 small block w/4-barrel Rochester. Fantastic car except for the Powerglide. Man, I'd kill to have that car and/or my old Mustang back.

Quote:
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I agree that the big block cars had to be worked on a lot but the small block engines hardly ever. At least back then if you had a problem it was extremely easy to pin point, and work on, not these things now days. I am starting to hate our Sentra.
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Old 09-03-2019, 11:21 PM   #126
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


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Agree... if you get a bad problem or lemon it can be a bear to figure out and put right. But by and large most modern vehicles are set it and forget it reliable, including the electronics.

We had a great 1964 Impala convertible with the 327 small block w/4-barrel Rochester. Fantastic car except for the Powerglide. Man, I'd kill to have that car and/or my old Mustang back.
I had mostly Chevys in the 60s and had some pretty mean engines. The one car I wish I had back more than any was the 71 Pontiac Formula Firebird, that was one mean machine.

I went out today and sprayed starter fluid everywhere there might be a vacuum leak, not a thing, I didn't find any leaks at all. So tomorrow I will get in on the injectors and see what they look like. I am still not kicking any codes out.
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Old 09-04-2019, 10:52 AM   #127
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


The best and safest way to find a vacuum leak is with a smoke machine. I use to do it with carb cleaner but that caused a fire. 8 isn't that bad for long term fuel trim. You need to drive the car when it's repaired and running good before you look at fuel trim. A restricted exhaust will make trim readings no good. Leave the injectors alone for now. Did you check the muffler? You don't have to cut it off. Just cut a piece out of the pipe before muffler facing down and drive and see if that remedies the problem. We have to find the root problem before going after vacuum leaks and other stuff.
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Old 09-04-2019, 05:36 PM   #128
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Thanks BB, I was going to remove the injectors today but man that is a pain to say the least. I can find where the fuse is to the fuel pump so I didn't do anything today but clean a set of injectors I took off another car. I tested them and they all read the same ohms so when I do need to swap them out I got a set.

I just haven't have the umpf to get back under the car but I will for sure remove the pipe going to the muffler if nothing else, at least I can put a sleeve back on it to hook it back up. That little sucker is going to be some kinda loud. lol I will let you know how it goes.

I am a little more than concerned about my oil pressure. Yesterday the oil pressure dropped so low the light came on. This car has both an idiot light and a gauge, the gauge was dead zero when the light came on at idle. When I brought the rpms up a little the pressure came up also. I wish I could do a plasti gauge on the bearings and see what the clearance is.

Just in case I have to snatch this engine, I will rebuild it, another 2.5 Spec V 200 hp engine is wayyyyy out of my range. I would need to look around town and see how much a crankshaft kit would run. No way to drop the crank from below, I would never get the flywheel off. Hmmm just had a thought, I could get a regular 2.5 engine and still be ok, as mater fact I could use regular gas then, there is only 30 hp difference. OK, I am through thinking out loud. lol
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Old 09-07-2019, 08:20 PM   #129
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Today I ruled out an exhaust leak at the exhaust manifold as I replaced the gasket. Can you believe the price of a gasket now days? Car still does the same thing. So Monday, Lord willing, I will cut the exhaust pipe in front of the muffler and run it around trying to stay away from the cops. lol

While I didn't find a vacuum leak with the starter fluid, it still acts like it has one. That combined with the muffler problem and that would sure cut the power down. I plan to make my own smoke machine and see if I can find a vacuum leak that way.

These readings, on the 02 sensor voltage is the voltage in the photo mv or just volts. If just volts that is way way too high, they should never be above .900 v nor lower than .100v The photo is the engine running at 2500 rpm already warmed up.

The next photo is of the shrft1 and 2 @ 2500 rpm.
The last photo is @ idle
Attached Thumbnails
2008 Nissan Sentra Stumbles at 3000 RPM-02-sensors-upstream-both-banks.jpg   2008 Nissan Sentra Stumbles at 3000 RPM-2500-rpm.jpg   2008 Nissan Sentra Stumbles at 3000 RPM-idle.jpg  
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Old 09-08-2019, 09:22 AM   #130
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


A little advice my Father gave me when I was young.

People trade/sell cars for a reason.

If the car looks great it might run like ****

If it looks like **** it might run great.

But it's highly doubtful that you'll get it runs great, it looks great on your budget......
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Old 09-08-2019, 09:46 AM   #131
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


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A little advice my Father gave me when I was young.

People trade/sell cars for a reason.

If the car looks great it might run like ****

If it looks like **** it might run great.

But it's highly doubtful that you'll get it runs great, it looks great on your budget......
Wise advice.

I have had great luck once though.

4 years ago, I was in need of a newer vehicle, and searched and looked for months, and finally found a great looking a great running used car.

It is a retired U.S. MARSHALS prisoner transport S U V.

The fellow that I purchased it from, was a security officer at a federal prison, and had bought it in their annual trade in program to keep the fleet new.

He had bought it to replace his wife's Isuzu Rodeo.

She drove the Explorer one time, and ordered him to get rid of that tank, it's too big.

So I got a 5 year old vehicle with less than 40,000 miles on it, that had been kept in excellent condition, for half the cost of very similar ones at dealerships.

Deals are out there, it takes patience, and LUCK.

I suggested that Jim, get a CARFAX report on his purchase, but have never heard if he did.

The CARFAX on mine clued me in on it's life, and I asked the previous owner about it, is why I know where and what mine did before I bought it.


ED
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Old 09-08-2019, 10:38 AM   #132
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


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Originally Posted by de-nagorg View Post
Wise advice.

I have had great luck once though.

4 years ago, I was in need of a newer vehicle, and searched and looked for months, and finally found a great looking a great running used car.

It is a retired U.S. MARSHALS prisoner transport S U V.

The fellow that I purchased it from, was a security officer at a federal prison, and had bought it in their annual trade in program to keep the fleet new.

He had bought it to replace his wife's Isuzu Rodeo.

She drove the Explorer one time, and ordered him to get rid of that tank, it's too big.

So I got a 5 year old vehicle with less than 40,000 miles on it, that had been kept in excellent condition, for half the cost of very similar ones at dealerships.

Deals are out there, it takes patience, and LUCK.

I suggested that Jim, get a CARFAX report on his purchase, but have never heard if he did.

The CARFAX on mine clued me in on it's life, and I asked the previous owner about it, is why I know where and what mine did before I bought it.


ED
Ron, your dad was spot on, he got it totally right. This car looks like it just drove off the showroom floor...without the engine. lol We did do a VIN look up and there wasn't much there. The dealer lied from word go. My wife and I are on a fixed income so we were very limited in what we could afford. I sold our pontoon boat to get the Pathfinder, I sold our camper to get the pontoon, I sold the teardrop camper I built to buy the camper. lol

We bought the Sentra from the money we got from the truck hitting and totaling our outer in perfect condition car. lol
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Old 09-25-2019, 06:44 PM   #133
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


I am beginning to hate this car, dad blame son of a gun. My back has not allowed me to get back under the car to check out the muffler so in the meanwhile I am trying to find out how in the dickens to get the blame fuel injectors out of this car. It looks like the intake plenum will have to come out first. The catch is it is way too close to the fire wall to get your hand past it let alone your arm.

I have done a lot of searching and have found the Nissan 2.5 engine changed a lot from 2006 to 2007 and up. Any 2.5 below 2007 will not fit this car. I did find one good thing, the 2007 and up does not have a power valve where the blame screws would fall out and get sucked into the engine, that is a big plus. This 2.5 also has a composite intake not a cast aluminum like the 2006 and older.

I looked at the manufactures manual, it does show how to remove the intake and fuel rail... with the dern engine sitting on the floor. There is no way I can see to get in there and get it off still in the car. I can tall you this, if I pull that sucker, you can bet I will totally rebuild it while it is out.
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Old 09-25-2019, 07:06 PM   #134
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


Man, Jim you are more persistent than I... and I'm a stubborn persistent SOB myself!
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Old 09-25-2019, 09:00 PM   #135
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Re: 2008 Nissan Sentra Stumbles at 3000 RPM


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Man, Jim you are more persistent than I... and I'm a stubborn persistent SOB myself!
I usually don't give up until I finish but man this one is sure tempting. There has got to be an answer and I will find it if I have to totally put another engine in it. lol on a fixed income, and things have to happen. Most times it is too much month at the end of the money. lol
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