Idle problem solution - Nissan Forum
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post #1 of 20 Old Sep 4th, 2006, 01:20 AM Thread Starter
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Idle problem solution

Okay folks,

If you are like me, and your altima's idle is bad/shaky, then look here.
Here it is:
Nissan Technical Bulletin No.NTB93-117

Take this bulletin to a nissan dealership and hand them this information written down on paper.

"The Altima’s 2.4-liter 4-cyclinder engine has had problems with a rough idle (vibration) which is transmitted through the steering wheel, seat and floorboards when the transmission is in drive and the brakes applied. There’s a detailed idle speed adjustment procedure which has eliminated the condition on a number of vehicles, and this needs to be performed by a qualified technician"

I hope this helps.
Enjoy!
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post #2 of 20 Old Sep 8th, 2006, 09:35 PM
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so will this all be fixed for free?
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post #3 of 20 Old Sep 9th, 2006, 01:40 PM Thread Starter
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Quote:
Originally Posted by MickeyKnox
so will this all be fixed for free?
no. you'll probably get charged an hour of labor.
I took my 97 altima in with that bulletin number, and they pointed out that I should get my engine mounts fixed first. You may want to have your engine mounts fixed. My brother's 99 altima had problems with that too.
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post #4 of 20 Old Sep 10th, 2006, 03:54 PM
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This apply for the 5spd transmission too?
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post #5 of 20 Old Sep 10th, 2006, 11:03 PM Thread Starter
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Quote:
Originally Posted by Leuthesius
This apply for the 5spd transmission too?

You got me. That is a question for the dealership's service department. Please post what the dealership says. You may want to have your distributor looked at. I've read that the distributor could be causing the shake. Have the engine mounts looked at. I am getting all 4 of mine swapped out for $400.
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post #6 of 20 Old Sep 11th, 2006, 01:28 AM
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your distributor could be doing it but the more common problem for all of this (and this service bulletin looks to be just a cover up of it) is a vacuum leak. Normally this occurs in the intake gasket. Turning your idle up a bit will only compensate for the problem until the leak gets worse. This is not always the case but the easiest way to test for this problem is to spray carb clean around the intake manifold when the idle is "rough" and if it smooths/evens out at any point then you have an intake gasket leak at that point that it smoothed out (test a few times at that spot to make sure that its correct and wasn't just a smooth spot in the idle). Unfortunately with our motor it seems to be a fairly common problem as is the oil in the distributor cap, but that'll cause some rough idle, bad driving and then quit altogether on ya. I hope this helps you out a bit.

Darktide


EDIT: its highly unlikely that this specific bulliten deals with manual transmissions because of the use of the work "drive" normally if a TSB is meant to include both transmissions it will use the word "gear" because there is no drive on a manual tranny. But this problem does occur with both types of trannys.

Last edited by Darktide; Sep 11th, 2006 at 01:30 AM.
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post #7 of 20 Old Sep 11th, 2006, 07:55 PM
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Quote:
Originally Posted by frenchhorn1
You got me. That is a question for the dealership's service department. Please post what the dealership says. You may want to have your distributor looked at. I've read that the distributor could be causing the shake. Have the engine mounts looked at. I am getting all 4 of mine swapped out for $400.
I managed to do all of mine but the transmission mount myself for less than $150. You can get the mount on the passenger side for $50 at Autozone or Oreillys. The others are $20 & $30 respectively (ish).
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post #8 of 20 Old Sep 14th, 2006, 09:06 AM
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Quote:
Originally Posted by Darktide
the easiest way to test for this problem is to spray carb clean around the intake manifold
my altima shakes on idle, too. and the rpm is not steady. i changed out all my motor mounts and tranny mount last summer.

so I spray where the manifold meets the head, or where the manifold meets the throttle body? or both? is there other things that can cause the vibration? vacuum hoses all checked out. the freakin shakin of the steering wheel is annoying as crap....

Last edited by erik2282; Sep 14th, 2006 at 09:09 AM.
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post #9 of 20 Old Apr 11th, 2009, 08:08 PM
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Hey what did you end up doing for your nissan to fix it. Mine is having the exact same problem, at idle the rpm's jump around and the steering wheel shakes an all that crap.
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post #10 of 20 Old Apr 8th, 2010, 06:17 PM
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I have a 2005 Altima with this problem...as far as I know, wasn't the engine basically the same from 1993-2006?

If that's the case, do you guys think this will solve my issue with vibration at idle? It goes away when I shift the transmission into neutral. This is an automatic, 2.5s, 4cyl model with 98k.

Thanks for any help

Apologies for bumping a post that's 4 years old...
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post #11 of 20 Old May 17th, 2010, 02:12 PM
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Hey AltimaBlue,
I saw your post about the idle problem. What I have been informed about is that this idle problem is due to the electric fuel pump. This pump pressurizes the system at a certain psi. As the car gets older this pump does not put out the same psi in the system. So the car runs fine while driving but when at an idle the pump now does not put out enough pressure which causes the idle to fluctuate and the motor to shut off.

The fix is to replace the fuel pump.
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post #12 of 20 Old Jun 4th, 2010, 07:33 AM
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Fuel pump? Seriously?

Quote:
Originally Posted by mrrogers View Post
Hey AltimaBlue,
I saw your post about the idle problem. What I have been informed about is that this idle problem is due to the electric fuel pump. This pump pressurizes the system at a certain psi. As the car gets older this pump does not put out the same psi in the system. So the car runs fine while driving but when at an idle the pump now does not put out enough pressure which causes the idle to fluctuate and the motor to shut off.

The fix is to replace the fuel pump.
Has anyone fixed the problem this way? This "solution" doesn't make the most sense to me, since the fuel pump runs at the same speed/PSI all the time (doesn't it?) and excess fuel comes back to the tank via the return. If there was a problem with the fuel pump, it seems to me you'd see a problem at high RPM, not at idle, and that problem would be massive.

The service bulletin is an adjustment to the A.A.C. valve to properly set the base idle. This makes sense, as everyone with the problem also sees some odd variation in idle speed or smoothness.
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post #13 of 20 Old Oct 26th, 2010, 08:28 AM
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where can I find a copy of this TB?
Thanks
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post #14 of 20 Old Oct 26th, 2010, 02:34 PM
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Originally Posted by joyosnow View Post
where can I find a copy of this TB?
Thanks
This thread is really old.

If you've got the really bad vibration/near stall at idle with the transmission engaged on the Nissan KA24DE (2.4L 4 cyl) engine, particularly if your computer throws the cylinder 3 or 4 misfire code (whether or not the "service engine" ligth comes on), you almost certainly have the intake manifold gasket leak Darktide is talking about.

This ASSUMES the vehicle is otherwise in good repair. If you've never replaced a spark plug or wire, distributor cap or rotor bobbin, fuel or air filter, I'd start with those things.
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post #15 of 20 Old Oct 26th, 2010, 11:46 PM
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I did replace spark plug and wire, distributor cap and rotor, fuel/air filter, EGR Valve and intake manifold gasket, however, the problem is still there. the RPM vibrates and engine shakes, sometime knocks.
I am wondering if the TB NTB93-117 will help?
Thanks for your response.

Quote:
Originally Posted by lintocs View Post
This thread is really old.

If you've got the really bad vibration/near stall at idle with the transmission engaged on the Nissan KA24DE (2.4L 4 cyl) engine, particularly if your computer throws the cylinder 3 or 4 misfire code (whether or not the "service engine" ligth comes on), you almost certainly have the intake manifold gasket leak Darktide is talking about.

This ASSUMES the vehicle is otherwise in good repair. If you've never replaced a spark plug or wire, distributor cap or rotor bobbin, fuel or air filter, I'd start with those things.
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