2001 Pathfinder - POwer Loss - Nissan Forum
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#1 Old Nov 20th, 2004, 11:29 AM
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2001 Pathfinder - POwer Loss

I've had my pathfinder to teh dealership 4 times this month with same problem. I loses power, they have replaced the mass air flow sensor but it didn't cure the problem. Tech has no idea what is causing the problem and has asked Nissan for help. He also said he got another pathfinder in yesterday with the same problem. The problem seems to be intermitent, when the engine is not performing it's hard to get it about 110klm per hour. Anyone seen similar or having the same problem.
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#2 Old Nov 20th, 2004, 11:49 PM
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Quote:
Originally Posted by gfostertruro
I've had my pathfinder to teh dealership 4 times this month with same problem. I loses power, they have replaced the mass air flow sensor but it didn't cure the problem. Tech has no idea what is causing the problem and has asked Nissan for help. He also said he got another pathfinder in yesterday with the same problem. The problem seems to be intermitent, when the engine is not performing it's hard to get it about 110klm per hour. Anyone seen similar or having the same problem.
I am currently experiencing a similar problem although it may not be the exact same problem. My 2001 pathfinder will run fin until I get on the highway. Then when I get into overdrive I will floor it to pass and it will kickdown into third gear. When I reach 4000 RPM's I notice a significant decrees in acceleration. I acts almost like the exhaust is restricted. Then when I reach my desired speed I will let off the gas pedal and it will not shift back into overdrive for 30 seconds to a minute. This may be a transmission problem. Either way I am going to hook a computer up to it next week and see if it pulls any codes. I can undergo addition diagnostics if no codes are present. Does your pathfinder exhibit similar characteristics? If not. Tell me exactly when power loss is experienced. RPM, which gear you are in, warm or cold, ect.... I will try to help.
#3 Old Nov 21st, 2004, 09:41 AM
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very similar

Quote:
Originally Posted by evmo
I am currently experiencing a similar problem although it may not be the exact same problem. My 2001 pathfinder will run fin until I get on the highway. Then when I get into overdrive I will floor it to pass and it will kickdown into third gear. When I reach 4000 RPM's I notice a significant decrees in acceleration. I acts almost like the exhaust is restricted. Then when I reach my desired speed I will let off the gas pedal and it will not shift back into overdrive for 30 seconds to a minute. This may be a transmission problem. Either way I am going to hook a computer up to it next week and see if it pulls any codes. I can undergo addition diagnostics if no codes are present. Does your pathfinder exhibit similar characteristics? If not. Tell me exactly when power loss is experienced. RPM, which gear you are in, warm or cold, ect.... I will try to help.
Very similar, feels like it is being held back. When it's not working I have to shift it with the overdrive button. Feels like it is bogging down when try to pass.
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#4 Old Nov 21st, 2004, 11:12 AM
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Test Drive

Quote:
Originally Posted by evmo
I am currently experiencing a similar problem although it may not be the exact same problem. My 2001 pathfinder will run fin until I get on the highway. Then when I get into overdrive I will floor it to pass and it will kickdown into third gear. When I reach 4000 RPM's I notice a significant decrees in acceleration. I acts almost like the exhaust is restricted. Then when I reach my desired speed I will let off the gas pedal and it will not shift back into overdrive for 30 seconds to a minute. This may be a transmission problem. Either way I am going to hook a computer up to it next week and see if it pulls any codes. I can undergo addition diagnostics if no codes are present. Does your pathfinder exhibit similar characteristics? If not. Tell me exactly when power loss is experienced. RPM, which gear you are in, warm or cold, ect.... I will try to help.
I went for a drive today and made a few notes, here goes;

At 110klm per hour, about 2600rpm, put peedle to floor, rpm jump to 3500 and speed increases slightly. At slightly below 110 the rpm's jump to 5500 and speed slowly creeps up to 120. At 120 floored it and the rpms went to 4500 and would not go above the 4500, gears did not change.
At the 110 it would change gears increase speed to 120 and change gears again at about 5500.
Appreciate the help, hope this helps.
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#5 Old Nov 22nd, 2004, 08:04 AM
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Computer

Quote:
Originally Posted by gfostertruro
I went for a drive today and made a few notes, here goes;

At 110klm per hour, about 2600rpm, put peedle to floor, rpm jump to 3500 and speed increases slightly. At slightly below 110 the rpm's jump to 5500 and speed slowly creeps up to 120. At 120 floored it and the rpms went to 4500 and would not go above the 4500, gears did not change.
At the 110 it would change gears increase speed to 120 and change gears again at about 5500.
Appreciate the help, hope this helps.
I will hook the computer up to it Wednesday or Thursday. If I find anything I'll let you know. The problem does sound similar. Mine definitely feels bogged down when I try to pass. The only time it functions correctly is when I try to show someone the problem. Go figure. Hope I can help.
#6 Old Nov 26th, 2004, 04:06 PM
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I was at the Nissan dealer yesterday, they have advised Nisan Canada of the problem and are waiting for a reply.
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#7 Old Nov 28th, 2004, 01:32 AM
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Quote:
Originally Posted by evmo
I will hook the computer up to it Wednesday or Thursday. If I find anything I'll let you know. The problem does sound similar. Mine definitely feels bogged down when I try to pass. The only time it functions correctly is when I try to show someone the problem. Go figure. Hope I can help.
FUEL!!!!
(Or at least, the lack of it)
That is the problem.

Replace the inline fuel filter.
I'm sure that it will cure the problem that you are all having in this thread.

Hope this helps.

MaX
#8 Old Nov 28th, 2004, 11:51 AM
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Quote:
Originally Posted by MaXiLeeCH
FUEL!!!!
(Or at least, the lack of it)
That is the problem.

Replace the inline fuel filter.
I'm sure that it will cure the problem that you are all having in this thread.

Hope this helps.

MaX
Hey, I'll give it a try. It seems to be very intermittent for it to be that simple. Can you tell me where the filter is located.
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#9 Old Nov 29th, 2004, 09:31 PM
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Fuel Filter - No Change

Quote:
Originally Posted by gfostertruro
Hey, I'll give it a try. It seems to be very intermittent for it to be that simple. Can you tell me where the filter is located.

Tried replacing the fuel filter tonight with no change.
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#10 Old Dec 1st, 2004, 07:28 PM
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Finally

Catalytic converters were blocked. After scanning the car no codes were found. While flooring it in neutral the RPM's would not exceed 4500 and then it 3000 towards the latter part of the week. This would either be a fuel problem or exhaust. Turns out to be exhaust. Took it to the dealer after informing them of the other test we had done and they confirmed blocked cats. This is under a 8 yr 80,000 mile emission warranty in the US. If replacing the fuel filter doesn't work try flooring it in nuetral. If the rev limiter is not reached you may have the same problem.
#11 Old Dec 5th, 2004, 09:06 AM
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Quote:
Originally Posted by evmo
Catalytic converters were blocked. After scanning the car no codes were found. While flooring it in neutral the RPM's would not exceed 4500 and then it 3000 towards the latter part of the week. This would either be a fuel problem or exhaust. Turns out to be exhaust. Took it to the dealer after informing them of the other test we had done and they confirmed blocked cats. This is under a 8 yr 80,000 mile emission warranty in the US. If replacing the fuel filter doesn't work try flooring it in nuetral. If the rev limiter is not reached you may have the same problem.
I tried the neutral test, mine revs all the way up. Yesterday it worked great for about an hour then back to crap. I may pick up a code scanner and leave it plugged in and see what happens. Do you have any other suggestions I can try?
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#12 Old Dec 5th, 2004, 05:26 PM
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Hey trust me it is the Cats! My 01 Frontier is having the same problem right now, the only problem is that the dealer is giving me the run around and telling me the cats are fine. I'm contacting Nissan Corporate tomorrow to see if they can put this dealer in their place. The dealer would just rather blow this problem off instead of replacing the Cats! Nissan knows they have a problem with their cats but tend to keep it hush hush! There are a number of people in this forum that have the same problem, incuding one that just bought a new 04 frontier and is on his second set of Cats with only a couple thousand miles on the truck, go figure!

hope this helps, good luck and dont let the dealer tell you no BS!
#13 Old Dec 5th, 2004, 07:34 PM
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Quote:
Originally Posted by jmeyers33
Hey trust me it is the Cats! My 01 Frontier is having the same problem right now, the only problem is that the dealer is giving me the run around and telling me the cats are fine. I'm contacting Nissan Corporate tomorrow to see if they can put this dealer in their place. The dealer would just rather blow this problem off instead of replacing the Cats! Nissan knows they have a problem with their cats but tend to keep it hush hush! There are a number of people in this forum that have the same problem, incuding one that just bought a new 04 frontier and is on his second set of Cats with only a couple thousand miles on the truck, go figure!

hope this helps, good luck and dont let the dealer tell you no BS!
Thanks, I'm going to visit the dealer tomorrow.
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#14 Old Dec 15th, 2004, 03:00 PM
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same problem here as well... 2001 pathfinder.

Hey All, I'm new here, but I'm here 'cause I've having the exact same issues you guys are describing. At first I thought it was the cats too, but now I believe it's transmission related, here's why:

1. When the problem exhibits itself, the transmission will kick-down but is then reluctant to shift up. A quick cycle of the overdrive lockout and the trans will upshift as normal. If left alone it will eventualy upshift into OD, but it usually lingers in third reving out. It's just acting wonky.
2. If crusiing down the highway at 65 and I give it just a little gas, the revs will raise a little, like 500 RPM (third gear?) then lower as if it's shifting back into overdrive even though I'm attempting to accelerate. This is very strange. Try giving the car enough throttle trim to shift out of overdrive, but not enough to kick into second. Does the RPM needle raise then immedately lower? (I usually have a bit of bucking at this point... the truck begins to shudder.) Compare this to when it's running OK, you know that occasional day when you notice things seem better. I get different results, car kicks down as expected, actually pulls under acceleration, and RPM's are correct.
3. Seems worse on colder days (50+ degree days and it seems better)
4. Scantool (www.scantool.net) shows what appears to be normal O2 values while driving and at idle, at least each bank is consistent that is, no real idea what they are supposed to read. I've also passed emissions (Massachusetts) while it was running rough (or in this strange state), and this confirms what I see in the scantool, everything appears to be normal.

I've used a scantool to read codes and I have none. The engine seems to be running OK. Idle is fine, gas milage is about the same (17 to 20 MPG.) I've taken the thing to the dealer twice, both times with no luck. Last dealer visit they replaced the intake sensor and it ran well for a while, but it's back to this problem again.

I've tried dry gas, letting it warm-up more before driving, beating the snot out it, and even some voodoo... nothing. dealer has been no help. Also, there are no codes... the computer thinks the damn thing is fine.

I have read that the Transmissions for the 01's have a known "flare" issue and might require a new Transmission control unit, so I'm going to try that. No idea what transmission "flare" is though. Anyone?

BTW, I'm not saying it's NOT the cats, cause I still kinda believe that could be it as well. Anyway, I'd be interested in hearing what you all think of the transmission theory.

Last edited by rgbman; Dec 15th, 2004 at 03:20 PM. Reason: I mean't third gear... lingers in third
#15 Old Dec 17th, 2004, 09:47 PM
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Sorry I was away a while.

I did figure out what was wrong with my Pathfinder. The cats were clogged. This problem got progressively worse until about 2 weeks ago my engine would not rev past 3000RPM's. Took it to the dealer and they replaced the cats under warranty. They claimed the mass airflow sensor was bad. I didn't believe them and I'm not sure I still do but researching this with other dealers and shops I was told the mass airflow sensor will go bad causing rich fuel mixture into the engine which will let unburned gas into the exhaust system. The gas then finishes combusting in the exhaust system and burns the cats out causing them to crumble. So I paid the $590 to have the mass airflow sensor changed. My car runs better than it has since I've owned it.

rgbman:

I too thought my problem was the transmission. This would have been ideal for me since my father owns a transmission shop. I thought rebuild the transmission and all will be good. After hooking the scanner to it we watched the signal from the computer to engage the soliniods in the transmission. If the tranny didn't shift when the computer prompted it to then obviously there was a problem. It however did as it was told. When the transmission is in overdrive and you kick it down to third it will not always shift back into overdrive if you let the accelerator up because code is written into the computer to delay this to keep the transmission from shifting back and forth too much.

If you give a little gas and the RPM's increase by 500. This is normal at a higher gear due to the torque converter. This is basically two opposing fans. The fan connected to your crankshaft blows transmission fluid into the fan driving the rest of your drive train. I cannot rule out your transmission, but if your scan tool monitors signals from your computer this could be a good way to trouble shoot. If your tranny is signalled to shift and it doesn't then you might have a problem there.

You can find an independent shop that will inspect your vehicle for free where a dealer charges diagnostic fees. They can tell you if your cats are clogged for free. My experience with dealers is they will find something to charge you for. I did not want to pay for the airflow sensor but the dealer told me they would not warranty the cats if I didn't because they claimed that's what caused the problem.

Hope I was helpfull
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