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Discussion Starter · #1 · (Edited)
Ok guys i am new here but have been a lurker here for a looong time! I drive a 2002 Nissan Frontier XE Desert Runner. Auto Tranny with VG33e OK so here is goes.. my problem started this morning. I started my truck up and took off to work i got about a half mile down the street and my truck all of a sudden would not rev past 2000 rpm.. so i turned around to bring her back home slowly, I got almost home and it stopped. i was able to drive again and went to work. on my lunch break the exact same thing happened lasted a few minutes then i was able to drive again. so i got home and hooked up my scan tool. Now my check engine light was already on for the fuel temp sensor being bad ( got the parts on order). but another code was there P1490 Vacuum Valve bypass Valve.. is this my issue with the Limp mode? or do i have other problems. I tried to clear the codes. and drive around a bit and its still happening with the same codes coming up

any help with this would be great !
 

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Discussion Starter · #2 ·
Ok well a update to this problem that i am still having, I no longer have a check engine light on since i replaced my fuel temp sensor, but my truck is still going into limp mode. this is exactly whats happening every time. I start my truck and get in after about 3 min warm up and start to drive down the road withing 2-3 min of driving it will go into limp mode and not allow me to rev my engine past 2000 rpm it will do this until i do one of two things, i either have to shut the truck off via key and restart it but then it does it again after a few min of driving, of what i have found works every time is after it goes into limp mode i shift into neutral and rev it and it revs up to redline and then i shift back to drive and it works fine and no problems till i restart the truck.... whats going on here, i am not getting any check ending light or any codes popping up, this problem literally started out of nowhere
 

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Gen 2?
 

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Ok guys i am new here but have been a lurker here for a looong time! I drive a 2002 Nissan Frontier XE Desert Runner. Auto Tranny with VG33e OK so here is goes.. my problem started this morning. I started my truck up and took off to work i got about a half mile down the street and my truck all of a sudden would not rev past 2000 rpm.. so i turned around to bring her back home slowly, I got almost home and it stopped. i was able to drive again and went to work. on my lunch break the exact same thing happened lasted a few minutes then i was able to drive again. so i got home and hooked up my scan tool. Now my check engine light was already on for the fuel temp sensor being bad ( got the parts on order). but another code was there P1490 Vacuum Valve bypass Valve.. is this my issue with the Limp mode? or do i have other problems. I tried to clear the codes. and drive around a bit and its still happening with the same codes coming up

any help with this would be great !
I'm sorry I don't have experience with the P1490, but I can verify that while the fuel temperature sensor is definitely not the cause of your symptoms, it will greatly harm your gas mileage.

My 2004 Nissan Frontier V6 won't set long term fuel trims unless it knows the temperature of the fuel. This means that little changes that your Frontier needs outside the factory standard map (all vehicles need a least small adjustment) it'll do with short term fuel trim. This means it's always acting like it's had a reset and it doesn't know what to do with your fuel maps.

When I fixed that false catalytic converter codes no longer popped up, the fuel mileage went up a few points in the city and actually down on the freeway until Lucas Upper Cylinder lubricant brought me back up to where I was again.

It behooves you to save a lot of gas and get that fuel temperature replaced - if you mostly drive freeway....maybe not. ;) LOL

It does come on the fuel sending unit so it's all one part in case you didn't know.

Sorry again I don't know the P1490, but maybe I'll do some research for you. I too have done few posts and I have "lurked" on the forum for a long time, lol.

Whenever I have a question about my truck it's usually this forum that provides the answers.
 

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Gen 1 is 98-2004. Gen 2 is 05 to current year.
 

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Discussion Starter · #8 ·
**BUMP**

My issue is still going on every day with no codes popping on. does anyone have any info on this problem ? If i cant find help here i will have to bring it to the dealership and i really dont want to do that.
 

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Learning diagnostics is your best bet outside the dealership or good aftermarket tech

Ok guys i am new here but have been a lurker here for a looong time! I drive a 2002 Nissan Frontier XE Desert Runner. Auto Tranny with VG33e OK so here is goes.. my problem started this morning. I started my truck up and took off to work i got about a half mile down the street and my truck all of a sudden would not rev past 2000 rpm.. so i turned around to bring her back home slowly, I got almost home and it stopped. i was able to drive again and went to work. on my lunch break the exact same thing happened lasted a few minutes then i was able to drive again. so i got home and hooked up my scan tool. Now my check engine light was already on for the fuel temp sensor being bad ( got the parts on order). but another code was there P1490 Vacuum Valve bypass Valve.. is this my issue with the Limp mode? or do i have other problems. I tried to clear the codes. and drive around a bit and its still happening with the same codes coming up

any help with this would be great !
Sorry, I don't want you to have to go to a dealer, but unless you can watch some live data and understand a multitude of systems, like what I do in real life, and have ASE's for - performance diagnosis, you may have to be lucky to find the problem - which can mean a lot of wrong parts on the way to a solution. And if that's the case, then you can spend a lot more money than you would just getting a professional diagnosing the issues.

I looked up P1490 for you.

To me this website https://www.autocodes.com/p1490_nissan.html shows a lot of what to test and find what's wrong with your evap system, but I highly doubt it's the symptom you're trying to fix. That's nothing more than a system, which is designed to take gasoline vapours and use them in your engine. They are very rarely a problem that'll make your engine not run or run horrible, and if they did, the problem would be different.

Your other issue also has nothing to do with your problem - the fuel temp sensor, so what this adds up to is all the data you've shared gets me no closer to knowing what the problem even is.

Sorry bro.

If you have a good head on your shoulders and are willing to probably spend months learning engine diagnostics, I know a few good YouTube channel for general training, which when added together can help you with your issue, but you probably won't be able to just happen to learn a couple of things and find the problem - but it would be a better way to be lucky.

Here's a good training video to start:
You're driving and the fuel pump cuts out. Now what?

It'll help you understand fuel trims, which is the start to pointing you towards answers for many different issues.

I happened to have one more tab open on my browser, which I hadn't checked yet about the P1490 code. It might help you see another perspective as to why that code, while it is a problem, has nothing to do with the symptom you want to fix.

Code P1490 - Nissan Forum
 

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Hi Chris

Did you solve your the limp mode/ stumble ?

I just picked up an 04 with 61,000 miles and I'm having the exact same symptom. A few days after the problem showed up I took it to my mechanic, told him what was happening and to replace the timing belt and all other belts and hoses under the hood, he did, as well the crank sensor.
Got the truck back and it ran perfect for 2 days and then the limp mode returned during the first 5 minutes of driving from a cold start.

I tried your trick of shifting to neutral and revving the engine...it does work. Any words of advice will be greatly appreciated.
 

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I'm sorry I don't have experience with the P1490, but I can verify that while the fuel temperature sensor is definitely not the cause of your symptoms, it will greatly harm your gas mileage.

My 2004 Nissan Frontier V6 won't set long term fuel trims unless it knows the temperature of the fuel. This means that little changes that your Frontier needs outside the factory standard map (all vehicles need a least small adjustment) it'll do with short term fuel trim. This means it's always acting like it's had a reset and it doesn't know what to do with your fuel maps.

When I fixed that false catalytic converter codes no longer popped up, the fuel mileage went up a few points in the city and actually down on the freeway until Lucas Upper Cylinder lubricant brought me back up to where I was again.

It behooves you to save a lot of gas and get that fuel temperature replaced - if you mostly drive freeway....maybe not. ;) LOL

It does come on the fuel sending unit so it's all one part in case you didn't know.

Sorry again I don't know the P1490, but maybe I'll do some research for you. I too have done few posts and I have "lurked" on the forum for a long time, lol.

Whenever I have a question about my truck it's usually this forum that provides the answers.
This is interesting. My truck is also throwing catalytic converter codes and I know that there is an issue with the fuel sending unit as I had it replaced under recall, and it ended up not working. It's going in tomorrow to have that issue readdressed. I wonder if those codes will go away once it's fixed. I'm also having issues with stumbling under throttle when the vehicle is warmed up. Stay tuned as I might have a solution for another thread.

Sent from my SM-G935U using Tapatalk
 

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Discussion Starter · #15 ·
Hey guys I wanted to give a update. I am still having this problem.. I have sorta learned to live with it for now lol

Anyone else have any ideas? even the GURUS? come on someone has to have a idea
 

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VSS could definitely be involved, and a possible could be the ECT as well. If they're both easy n cheap I'd swap em both out.
 

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Hi Everybody,

I followed Clay's prescription in the above video. He is 100% right on !

After dismantling my dash to remove the gauge cluster, I examined the circuit board with a magnify glass and could not see any obvious breaks in the the solder.
So I took the gauge cluster to a local speedometer shop, Speedo Check in Whittier, CA. Mike the boss at Speedo Check, thoroughly tested the circuit board and found no irregularity. But he did re-solder all the connection at the plugs, just as Clay stated in his video. Paid Mike 40 bucks cash went home and reinstalled the cluster.
Ran the truck 490 miles over 3 days with out a problem.

My Frontier has 62,400 miles, relatively low compared to most 04's on the road these days. What I'm thinking now is that its an age related problem as opposed to a mileage issue.

A big thanks to Clays Auto Repair in Grand Rapids MI. And hope this info helps if this problems pops up down the road for anyone else.
 

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Hi Chris

Did you solve your the limp mode/ stumble ?


Soo i had this issue also. It ended up being MAF sensor. Changed that bad guy and BAM!! Gtg.
I

I just picked up an 04 with 61,000 miles and I'm having the exact same symptom. A few days after the problem showed up I took it to my mechanic, told him what was happening and to replace the timing belt and all other belts and hoses under the hood, he did, as well the crank sensor.
Got the truck back and it ran perfect for 2 days and then the limp mode returned during the first 5 minutes of driving from a cold start.

I tried your trick of shifting to neutral and revving the engine...it does work. Any words of advice will be greatly appreciated.
 
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