Need help

[holligl]

This spacer "showed up" during the middle of a valve check after removing the air box, and before TB removed. Can't figure out where it goes/what it does. Laying in this general area. Any help for me?

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[Sierra1]

TABASCO!!!!

 

[WJBertrand]

That looks like one of the steel bushings that goes into the rear gas tank mount grommets. Check the other side and compare.


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[magic]

There are 2 of them. They go into rubber grommets from the bottom on the lower part of the airbox assembly. The mounting bolts with the washers go through them on the front of the assembly. Look up a parts schematic from Rocky Mountain ATV, it's part number 28 under the intake schematic. For some reason, I can't attach it to this post.

 

[holligl]

That looks like one of the steel bushings that goes into the rear gas tank mount grommets. Check the other side and compare.


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Tipped the tank, so rear is still installed. The Inside diameter is too small for the rear tank bolt. Size works for front tank bolts, but the bolts washers and flanges for front tank bolts accounted for.

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[holligl]

There are 2 of them. They go into rubber grommets from the bottom on the lower part of the airbox assembly. The mounting bolts with the washers go through them on the front of the assembly. Look up a parts schematic from Rocky Mountain ATV, it's part number 28 under the intake schematic. For some reason, I can't attach it to this post.

BINGO! I owe you a beer! Easy to miss those. Don't normally fall out.

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[holligl]

OK that problem solved. Now I have an extra connector. Message sent to Tabasco, but he might be busy.

6 connections made to the TB as per the manual and the #1, ph 7-6 grip cancel switch coupler. Leaves me with this one.

Is it an unused aux plug?

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[Sierra1]

OK that problem solved. Now I have an extra connector. Message sent to Tabasco, but he might be busy.

6 connections made to the TB as per the manual and the #1, ph 7-6 grip cancel switch coupler. Leaves me with this one.

Is it an unused aux plug?

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There's no tape on it. It appears that all other connections have tape. Mostly orange but there's one with white. The connector in question has no tape. That would lend some credence to the unused plug.

 

[Jlq1969]

OK that problem solved. Now I have an extra connector. Message sent to Tabasco, but he might be busy.

6 connections made to the TB as per the manual and the #1, ph 7-6 grip cancel switch coupler. Leaves me with this one.

Is it an unused aux plug?

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airbox temp???

 

[holligl]

airbox temp???

Looks like it. Apparently it has not been hooked up for a while, as I did not disconnect it, and had to look the airbox over twice to find it. Another beer owed!

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[holligl]

There's no tape on it. It appears that all other connections have tape. Mostly orange but there's one with white. The connector in question has no tape. That would lend some credence to the unused plug.

Actually I labeled them with the orange tape. I labeled it duplicate in my confusion. These connectors drive me nuts, some you squeeze, some you lift the tab. Connecting is much quicker than disconnecting. I removed the orange once I figured out it was wrong.

Looks like it is the airbox temp sensor connector, which was apparently disconnected for some time.

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[Sierra1]

. . . . Looks like it is the airbox temp sensor connector, which was apparently disconnected for some time.

The sensor for the dash readout?

 

[Don in Lodi]

The sensor for the dash readout?

The computer uses it too.

 

[Sierra1]

So, I have all kinds of questions. How does the ECU know how much fuel to use? How does it even start? Running rich/lean? Is there a default mode if there's no input? What has the dash readout shown?

Am I overthinkin' this?

 

[Checkswrecks]

So, I have all kinds of questions. How does the ECU know how much fuel to use? How does it even start? Running rich/lean? Is there a default mode if there's no input? What has the dash readout shown?

Am I overthinkin' this?

In most cars and bikes, missing OAT input to the ECU results in calculations being made to standard day temp & pressure.

Standard day - Wikipedia

en.wikipedia.org

 

[Don in Lodi]

Open vs closed loop. With one or more seemingly important sensors out of the loop it will still run pretty damn good on it's memory. And a seemingly minor sensor out of the loop and it will barely run. I'm not sure if an IAT sensor being out of the loop is enough to set a check engine light or cause open loop. It has enough overlap with other sensors that it may not care to much and may still have been closed loop. For a check light to come on in a four wheeler it has to be something that will potentially wreck the cat.

 

[Sierra1]

With y'all's moderate temps, the ECU can probably get close by using file temps. I think there would be an issue here with our summer heat temps over 100°. Mixture would be way rich.

 

[Don in Lodi]

Except the O2 sensors should balance that out. Closed loop of course. The IAT, Intake Air Temp is for air density, air fuel ratio fine tuning. Same with the MAP/BARO. Though I've seen some bad running cars with a bad MAP. The problem comes in with plausibility. If the ecu 'thinks' the numbers could be right it will apply them. A faulty CTS, coolant temp sensor, will show negative 40. Plausible, but it will puke fuel out the tail pipe.

 

[Sierra1]

 

[WJBertrand]

I wonder if the connector wasn’t fully seated and it just disconnected upon removal of the air box? Hard to believe there wouldn’t have been an error code if it were already disconnected.


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