Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello. The base idle speed in park or neutral with no loadn on your vehicle should be 700 plus or minus 50 rpm
Your rpm are just over a thousand. That's a little high. was your throttle body recently cleaned? do you have any codes?
SES light indicates that you have a problem that has resulted in a diagnostic trouble code being stored. If you have access to a scan tool, you could get the code. I think you probably have a vacuum leak though. thoroughly inspect all the vacuum lines and see if they all look good.
A vacuum leak could have a negative impact on your fuel economy, but probably not a massive amount. Has your mpg gone way down at the same time as this engine rpm issue occured?
you may have another issue in addition to this, like a dragging brake caliper or something adding to the fuel consumption. I would search for a vacuum leak and check the codes and go from there. Most times a slightly increased idle is due to a vacuum leak. If you do have a vacuum leak, you may have a lean code.
worn plugs won't necessarily result in the engine running super rich ( black exhaust). The plugs could be causing worsening fuel economy if they are worn.
worn plugs are just plugs that are still working, but not as efficiently as they did when they were new. as plugs age, they work a little less efficiently
I would change them. It can only stand to make things better. definitely won't hurt. Also get the stored codes. I think your probably going to find lean codes indicating a vacuum leak.
worn plugs won't necessarily make it run horrible or cause a hard start condition. worn plugs aren't failed plugs. I'm not sure though that plugs are the issue. Although I would change them if the mileage warrants it, since it's a maintenance item. I still think the issue here is a vacuum leak. The stored code would help determine that with more certainty.
a transmission problem, alignment, tires, etc can all affect your fuel economy, for sure. They won't however affect your RPM at idle.
That size tire is one of the three specified tire sizes for your truck, so the size shouldn't be causing you any problems
Sure. I have attached the procedure in detail for checking the transmission fluid on your truck.
TRANS FLUID CHECK
It's not at all uncommon to encounter sticking brake calipers. We change them all the time. You could try raising the vehicle in the air and seeing if each wheel spins freely or if any seem to be dragging.
Your truck may have rear drum brakes.
usually dragging would be caused by a sticking caliper. If the shoes were dragging, it would usually be caused by over tensioned brake shoes. That doesn't usually happen though.
What your experiencing there is likely normal and not related to dragging calipers.
is this something that is recent, or has it always seemed that way?
I think what you are experiencing when engaging the*****is normal. Nothing to worry about there. Check for codes and we'll have a better idea of why your RPM are slightly raised.
I have to get going for a bit, but I should be back tomorrow evening. If you can get the code, let me know. Check for vacuum leaks too.
your very welcome.
I do not own or possess a 2003 nissan xterra so I am not able to take a picture of a tachometer in one. Right now you are just over a thousand RPM. the 1 represents a thousand RPM. You should be just under the 1 at idle. not over it
If you are running your AC, your idle speed will be increased some. See the attachment for verification of proper idle speed.
2003 NISSAN XTERRA IDLE SPEED SPECIFICATIONS
You should not have to adjust your idle. The idle is set at the factory. You had specified earlier in our conversation that your service engine soon light is on. I still think you should check for codes. When the check engine light is on, we always check for codes first. The codes are the cars way of telling you what is wrong or at least pointing you in the right direction. It doesn't make sense to guess at things or spend tons of time trying this or that without listening to what the car is trying to tell you first.
I would check for codes. There is most likely a code stored in the computer.
That's about 400 rpm. That seems a bit low. What did you do to make it drop so low? I have to assume it did not do that on it's own.
Wait, so your tachometer reads 400 rpm when the engine isn't even running? just when the key is turned to the run position? Its starting to sound like you have a bad instrument cluster. Let me ask you this.... When your engine is running, does it sound like the rpm are too high? Or does it sound perfectly normal like it always has?
I think you may be right. I'm not sure that you'll be able to reset the needles though. You may need to replace the stepper motors, or just install a different cluster, assuming that's what the problem is.. I suppose it can't hurt to try and re adjust the needles if that's what you want to do though.
Here is an image showing all the component locations along with the IAC
It looks like one page, but it's 2 pages so scroll down to see the second page.
I will be gone for a bit and limited only to my phone, so I am going to opt out so someone else can continue to assist you further.