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Surging idle problem

Tiny
WILLIAM516
  • MEMBER
  • 2005 NISSAN SENTRA
  • 1.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
Long story short, this car sat for a long time while I was away. When I came back the battery was dead. Someone was supposed to keep the engine turned over at least once a week and let it run. Well that never happened. When I came back the car would not run and the fuel has sat for almost a year.I changed the battery, drained the fuel, cleaned the fuel pump and filter, replaced the gasket on the fuel pump. I was able to limp her home and the engine was running bad. Little to no power and then surging RPMs. I looked on the forums and did some more work. I took apart the air filter housing, replaced the air filter, replaced all the spark plugs, pulled the MAF and cleaned it with MAF cleaner, Pulled the throttle body and cleaned it with throttle body cleaner.I have done the throttle body relearn, but have no clue if it works. When I let the car reach the correct running temp the idle will surge from about 1500 to 1800-2000rpm. It will then drop back down and repeat this forever. If the car is placed in drive the rpms will drop down to the correct readings and the car seems fine. I cant really take her out on the road is the registration / insp has expired and the car cant be inspected until the problem is corrected and the mil is out.I did notice that if I am revving the engine and let it off the rpm will jump around before coming back down. On the small test drives around the streets around the house. I noticed the rpms can be erratic if I gun the engine and let off right away the tachometer will jump around too. The MIL light came back on and it read P1273. I looked this up and see that it is a code related to o2 sensors and other things.I'm looking for some help. I have gone to a Nissan dealer before and they tried to screw me over so bad for simple repairs and I don't trust a dealer anymore. They only want money and "throw parts and the problem" I prefer to troubleshoot the problem and get the "right" part. Could someone please direct me in the right direction. I don't have a ton of money to dump into this car to chase this problem. The car is a 2005 Nissan Sentra 1.8dohc approx. 90K Thanks for any help that you can provide.
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Monday, February 24th, 2014 AT 6:33 AM

40 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This really needs to be tested with a pro style scanner and driven at 50 mph in 3rd range then slowed to 30 mph witout brakng 3-5 times. Then you need to check fuel pressure with a gauge and make sure sensor is tightened to 30-44 ft lbs. And ground screws for ecm need to be checked see pic.
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Monday, February 24th, 2014 AT 6:54 AM
Tiny
JAMESCKM
  • MEMBER
  • 2 POSTS
  • 2004 NISSAN SENTRA
  • 4 CYL
  • FWD
  • MANUAL
  • 62,000 MILES
I had a check engine light come on. I had the code read at auto zone it was the crankshaft position sensor. I replaced the sensor and the light went out but now the car idles at 1500 rpms then goes up to 2000 rpms and back down. The idle just keeps going up and down. The only thing that stopes the idle from going up and down is when I turn the a/c on then the car idles ant 1100 rpms and does not go up and down. The check engine light is still off and the people at auto zone read the car again and their are no hidden codes. How or what can I do to get the idle to go back to 700 rpms where it was before. The car is an SENTRA SE-R SPEC V
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
NACHIN2K
  • MEMBER
  • 1 POST
Sorry.I wish I could help, but unfortunately I haven't been able to find the crank position sensor on my 2004 Nissan Sentra Spec V. Considering that you just replaced it, can you tell me where is it is located? And how long it took to replace? AutoZone also diagnosed my sentra as having a bad crank position sensor as well.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JAMESCKM
  • MEMBER
  • 2 POSTS
You will find it below the throtle body near the back of the motor close too the bell howsinng of the transmission. It's between the motor mount and the engine block. I found the best way to get to it was to go from the top of the motor and not from under the car. You can buy the part from Auto Zone this will help you have a better idea of what to look for when you start looking. The Auto Zone part is a Duralast Part number SU6364. It took me an hour of surching before I found a diagram that showed me where it was, and it was not a very good drawing at that. I hope this helps you.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
  • 2002 NISSAN SENTRA
  • 127,564 MILES
My car.6 speed. Is reving. Up and down. From. 1000rpm. To 2000 rpm. Like the car is getting to much. Air.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
What's cei. And I got this code back. Po507. Another thing. If I put a cold
Air intake on will I have to put it on dyno for fine tuning.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you try starting with foot on accelerator pedal?
If the TPS is bad or out of adjustment, it can result in non starting without the aid of the accelerator pedal.

As to the TPS, try clearing the codes and see if they come back. What was the EXACT code you are getting?

P0507 is a fault with the IAACor idle control system and can be due to vacuum leakages etc.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
But I'm turning my key and getting nothing. And that's. The code I got back.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Turning and nothing happens indicates a fault with the starting system and it can be a flat battery, ignition switch, starter motor or security system.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
If I jump the. Starter will tht bypass engaging clutch. Cuz if so I did and the starter just was spining
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
How did you jump the starter?
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
Touching the bolt wire. And the other. One and all it. Did was spin.
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Monday, May 18th, 2020 AT 2:26 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The solenoid has to click for the starter gears to kick out to engage. What you need to do is to apply battery voltage to the starter solenoid wire, the small one to see if it turns.
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
K its not starter. How can I. Find out. About. Me not gettin power to starter
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Fuse #20 inside also clutch/trans switch and relay in underhood box.
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
Yes. Manual. Where is the relay. Switch.
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Ensure the immobilizer has not been triggerred. Is the security key in dash blinking while you try to crank?
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
Question trying to put cold air intake on car. Do I have to unplug tps sensor. Or no.
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Not necessary unless it is interfering.
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Monday, May 18th, 2020 AT 2:27 PM (Merged)
Tiny
JERMAINE2015
  • MEMBER
  • 11 POSTS
So I don't have to unplug nothing. Just put it on?
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Monday, May 18th, 2020 AT 2:27 PM (Merged)

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