2007 Sportsman 500 (MAP) Sensor - Polaris ATV Forum
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post #1 of 11 (permalink) Old 07-09-2019, 05:33 AM Thread Starter
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2007 Sportsman 500 (MAP) Sensor

Runs perfect when it's cold 50 degrees or below. Over 50 degrees won't idle well and bogs badly when throttled up then will backfire some. Getting progressively worse.

The foil on the bottom of the fuel tank is pretty rough. Could there be a vapor lock?

So I'm thinking of replacing the Manifold Air Pressure (MAP) sensor and the Intake Air Temp. (IAT) sensor. Will insure the wiring is good. What are the odds of the problem being something else?

When looking at the on-line OEM parts the MAP sensor seems to be referred to as a ASM sensor. What does ASM mean? Can't find a ASM sensor anywhere in the 2007 Polaris 500 Service Manuel. Am I looking at the wrong part? On-Line OEM parts Engine Fuel Injection # 10.

Appreciate your input and thanks in advance Need to get this thing running.
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post #2 of 11 (permalink) Old 07-09-2019, 05:46 AM
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I would test the sensors before changing them. Also are there any codes?

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post #3 of 11 (permalink) Old 07-09-2019, 02:07 PM Thread Starter
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Thanks for the response.
Checked the codes and there are none. Backed it out of the shop this morning and it started sputtering and missing. Ran up to the barn and bogging bad so now for the first time it is doing it cold so maybe not a air temp or pressure thing. Now I'm going to test the fuel pump pressure. That pump in it is only 4 years old or so. Micky Moused a after market fuel pump into the stock tank when the original went bad so there could be an issue with it.

Any ideas will be appreciated.
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post #4 of 11 (permalink) Old 07-09-2019, 02:28 PM
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Originally Posted by kcebcj View Post
Runs perfect when it's cold 50 degrees or below. Over 50 degrees won't idle well and bogs badly when throttled up then will backfire some. Getting progressively worse.

The foil on the bottom of the fuel tank is pretty rough. Could there be a vapor lock?

So I'm thinking of replacing the Manifold Air Pressure (MAP) sensor and the Intake Air Temp. (IAT) sensor. Will insure the wiring is good. What are the odds of the problem being something else?

When looking at the on-line OEM parts the MAP sensor seems to be referred to as a ASM sensor. What does ASM mean? Can't find a ASM sensor anywhere in the 2007 Polaris 500 Service Manuel. Am I looking at the wrong part? On-Line OEM parts Engine Fuel Injection # 10.

Appreciate your input and thanks in advance Need to get this thing running.
There is no MAP listed. Polaris simply calls it an air pressure sensor #10
# 9 is the grommet it mounts in.
#11 is the screw/washer asm (assembly)
ASM = Assembly in all Polaris schematics and parts lists (a group of two or more parts sold together as one unit)
If the sensor, grommet, screw, washer etc. were all listed together as one unit it would be called a sensor Asm. (assembly)

1 3084877 Bolt, Flange 2 USAGE
2 3089901 Bracket 1 USAGE
3 3089900 Pipe, Fuel Delivery Complete 1 USAGE
4 3088135 Bolt, Flange 1 USAGE
5 3089899 O-Ring 1 USAGE
6 3089896 Grommet 1 USAGE
7 3089893 Asm., Injector 1 USAGE
8 3089894 Seal, Fuel Injector 1 USAGE
9 3089902 Grommet 1 USAGE
10 3089895 Sensor, Air Pressure 1 USAGE
11 3089904 Asm., Screw/Washer 1 USAGE
12 3089903 Clip
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post #5 of 11 (permalink) Old 07-10-2019, 06:42 AM Thread Starter
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Thanks for that. I contacted Polaris and the MAP sensor in the service manual is the ASM #10 shown in the drawing. I'm stumped as to what the problem is with this thing. Gonna test the fuel pump pressure this morning.
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post #6 of 11 (permalink) Old 07-10-2019, 07:49 AM
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Originally Posted by kcebcj View Post
Thanks for that. I contacted Polaris and the MAP sensor in the service manual is the ASM #10 shown in the drawing. I'm stumped as to what the problem is with this thing. Gonna test the fuel pump pressure this morning.
Fuel pressure would be the first thing I'd check.
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post #7 of 11 (permalink) Old 07-10-2019, 03:05 PM Thread Starter
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Finally had time to tear that quad down far enough to test the fuel pump. Had to Micky Mouse a gauge but it works. Only getting 18 psi so ordered another pump. That old pump only lasted 4 years. It's a Carter P72118 pump but they work.
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post #8 of 11 (permalink) Old 07-10-2019, 03:35 PM
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What do guy's think is causing these fuel pumps to go out? Could it be just the nature of the pump being built to only last so long or could it be like the in tank fuel pump in a car/truck to were I've heard that actually the gas keeps the pump cool? Some people may be running their gas down to empty or nearly empty before they fill up.

In my vehicles I try my best to fill up no lower than 1/4 tank.

Tony

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post #9 of 11 (permalink) Old 07-10-2019, 07:04 PM
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Heat and alcohol!!
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post #10 of 11 (permalink) Old 07-13-2019, 04:17 PM Thread Starter
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Pulled the pump out of the tank today, will have the replacement Monday. When emptying the gas out of the tank it was very dark almost black. Do these tanks deteriorate?. Always very careful with the gas going in and it rarely gets below 1/2 tank. Will replace the filter also and check the pressure with the new pump. If low will order a regulator. Then if it does not run will go back to the MAP idea ha ha.
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