1986.5 SE-V6 High Idles - Nissan Forum
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#1 Old Nov 6th, 2008, 04:15 PM
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1986.5 SE-V6 High Idles

First off I wanted to say great forum, I have been wandering around here for a while finding out stuff about these trucks.

My truck is a 1986.5 SE-V6 5 speed with every option that I think they had back then. I bought this truck a little while ago, but didn't notice the idle when I bought it because I think it was already warmed up. The truck starts and idles at around 2000 RPM's (which I think is high). It will do this for a while, and when you put it in gear the revs will drop, but you can feel it pulling the truck along when you let off the gas. I haven't left it sitting there just high idling long enough to see how long it stays like this, but I know it has been longer than 5 minutes. Once I have had it out on the road for a while the idle will drop back down to about 800 as normal. Is there a high idle adjustment, or is there something else that it might be? I am mechanically inclined, but don't have a manual for this truck yet. (Take that to mean that I have tools and don't mind working on stuff, but I am not close to being a mechanic.)

Second question: I have started hearing a whining noise when the clutch pedal is pressed down and I am now wondering what that is too. I hope I didn't buy a lemon, because I was told the clutch was replaced just recently.

Third question: I know the box under passenger seat is the diagnostics unit, but what is the box under the drivers seat? I have heard it is another amp for the radio, but haven't really looked at it yet. My truck already had one amp below and behind the stereo. Is there really 2 amps on this truck?

I know, I know, lots of questions from a newbie, but Thanks for any help in advance,
Brandon

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#2 Old Nov 21st, 2008, 12:12 PM
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Anybody have an answer for this yet, I still have the high idle issue, and I am still not sure what is wrong with it.
I have found answers for the other 2 questions, but now I have a new one too.
There is a part on the driver side in the front of the engine bay. It looks to be about the size of a CD, but about 2 inches thick. It has a hose attached on either side of it. This part has rusted and when I rev the engine, what seems to be water comes out of the rusted through portion. What is this part, and could it be effecting the idle?

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#3 Old Nov 21st, 2008, 04:44 PM
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u should read the codes..

also check for vacumn leaks..

the whinning is prollie the throw aout bearing ..live with it or replace it..

most of us disconnect that gizmo or replace it all together
#4 Old Nov 21st, 2008, 05:08 PM
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Quote:
Originally Posted by zanegrey View Post
most of us disconnect that gizmo or replace it all together
Is this in response of the weird cd sized water filled gizmo question? What the heck is this thing? I have 2 manuals and neither one of them have this thing in them.

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#5 Old Nov 21st, 2008, 05:30 PM
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that is the aiv which is the air induction valve.

it has a solinoid activatated vacumn switch as well..

it is prollie your vacumn leak ...
#6 Old Nov 22nd, 2008, 01:33 PM
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High idle, replace the thermo element (wax kit) its in front of the throttle body, should be a couple of hose's going to it, (its inside the housing)
The whinning is probably a female (spending too much time with the truck and not her) J/K... Sounds like the throw-out bearing, either turn up the radio or replace it, if you replace it, might as well replace the clutch while your there... and maybe the rear main (seal).
Tha amp for the radio is under the dash, (on top of the hump) behind the heater duct.
The black box under the drivers seat is the ASCD controller (cruise control)
Hope that helps a little....
#7 Old Nov 22nd, 2008, 07:24 PM
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Cruise, I wouldn't have thought of that.

Who makes the better shop manual for these truck Chilton or Haynes?
Or who makes the more user friendly shop manual?
I have the official Nissan do-it-right maintenance, tune-up & repair manual, but it is basic maintenance well defined, but doesn't go in depth.
I also have the Chilton's Truck and Van Repair Manual 1982-1988, but it is basic also and doesn't go in depth either. That sucker covers every US Canadian and Import Pickups,
Vans, RV's and 4 wheel drive through 1 ton Models. It is about 4 inches thick.
Neither one of these show the Air Induction Valve or the thermo element.

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#8 Old Nov 23rd, 2008, 09:03 AM
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my haynes shows it in "emissions and controls", section..
#9 Old Nov 23rd, 2008, 02:49 PM
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Well, I pulled the totally rusted Air Induction Valve off and found out the little vacuum hose that was attached to it was solidly blocked, and the other part that it was connected to was also totally blocked. What is the part that is attached to the Air Induction Valve by lets say a 4 inch long small vacuum hose? The part also has 2 other vacuum hoses attached to it. The other end is attached to a wiring connector. I just don't know what that piece is.

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#10 Old Nov 23rd, 2008, 03:04 PM
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that is the control solinoid that is activated by the ecm..

i probably have an aiv i could sell you .

but just try disconnecting everything involved with it and block off the vacumn and see if it helps your idle..
#11 Old Feb 10th, 2009, 05:50 PM
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Back to the original problem

Well I found the AIV and the solenoid and all the other parts that I needed at a Pick&Pull junkyard. Replaced those parts, but it still has the high idle though, at about 2000 rpms. The codes it gives are (13 Engine Coolant Temperature Sensor) and (31 ECM). Is the 13 code for the thermostat or some other kind of electronic sensor?

My truck is a 1986.5 SE-V6 5 speed with every option that I think they had back then, just to keep everyone from having to scroll back up and figure out what truck I have.

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#12 Old Feb 11th, 2009, 11:48 AM
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high idle = wax kit (thermo element) it runs about $65
If the idle comes back down after its warmed up, change the above!
#13 Old Feb 11th, 2009, 05:45 PM
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Thanks man, will probably be trying to put that in this weekend. I didn't think it would be the thermostat, but was wondering which sensor it could be.

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#14 Old Feb 12th, 2009, 12:33 PM
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its NOT the thermostat, its a thermo element, located on the throttle body,
it's going to come in a spring loaded contraption (it keeps it compressed) so when you first see it you might say wtf??

Last edited by SPEEDO; Feb 12th, 2009 at 12:37 PM.
#15 Old Feb 15th, 2009, 10:21 AM
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Sorry, guess I should have explained that better. I knew you meant it wasn't the thermostat. I was kind of explaining that I knew that your explanation made more sense after I thought about it. Just didn't come across right.

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