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post #1 of 15 (permalink) Old 06-23-2019, 02:33 PM Thread Starter
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Won’t start

I have a 2008 kfx 450 full dasa, fuel customs intake, power commander v, went to the track over the weekend took a couple laps came back to the trailer and shut it off, went to start it back up to go back out and nothing, fuel pump doesn’t prime, doesn’t crank over, takes a while to get power through the quad ( to dash and power commander) I took the orange wire from under the dash and grounded it to the frame then my fuel pump primed and I had power to my dash, click the start button and it just clicks
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post #2 of 15 (permalink) Old 06-23-2019, 08:15 PM Thread Starter
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I noticed the sensor that bolts to the frame behind the gas tank beside the ground wire fell off the frame and was hanging by the wire, what’s that sensor and would it cause it to not start
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post #3 of 15 (permalink) Old 06-24-2019, 12:20 AM
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The MAP sensor?

08 KFX450r- DASA, FCI, Stage 2 Hotcams, Wiseco Programmer, Procom, Dynatek Coil, 6K HID, 7" LED Light Bar.

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post #4 of 15 (permalink) Old 06-24-2019, 02:22 PM
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Quote:
Originally Posted by Austin21w View Post
I noticed the sensor that bolts to the frame behind the gas tank beside the ground wire fell off the frame and was hanging by the wire, what’s that sensor and would it cause it to not start
That's the air pressure sensor that bolts next to the fuel tank mount along with the main harness ground...!

The air pressure sensor controls the idle, check the hose to the throttle body for damage....loosing the harness ground is the main culprit causing it not to start...!

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Last edited by Dust Devil; 06-24-2019 at 02:25 PM.
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post #5 of 15 (permalink) Old 06-25-2019, 05:05 PM Thread Starter
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The ground wire didn’t come off, only the sensor did
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post #6 of 15 (permalink) Old 06-25-2019, 08:48 PM
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The ground wire didnít come off, only the sensor did
Can you post a picture of the sensor that came off....???

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post #7 of 15 (permalink) Old 06-26-2019, 08:34 PM Thread Starter
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There it is
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post #8 of 15 (permalink) Old 06-26-2019, 10:28 PM
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Quote:
Originally Posted by Austin21w View Post
There it is
That's the vacuum pressure sensor...Check if the vacuum hose is damaged/leaking....?

Does the F.I light remain ON or flashing when starting/running or turn off when the fuel pump primes...??? see pictures below

(your quote from above) I took the orange wire from under the dash and grounded it to the frame then my fuel pump primed and I had power to my dash...
...Possible harness ground wire is broken/bad connection...?? ECU ground is pin 21...see pictures
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Last edited by Dust Devil; 06-26-2019 at 10:39 PM.
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post #9 of 15 (permalink) Old 06-27-2019, 08:28 AM Thread Starter
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The f.i does not stay on it goes out like it’s suppose to I’ll check my grounds when I get home from work
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post #10 of 15 (permalink) Old 06-28-2019, 04:37 PM Thread Starter
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Quote:
Originally Posted by Dust Devil View Post
Quote:
Originally Posted by Austin21w View Post
There it is
That's the vacuum pressure sensor...Check if the vacuum hose is damaged/leaking....?

Does the F.I light remain ON or flashing when starting/running or turn off when the fuel pump primes...??? see pictures below

(your quote from above) I took the orange wire from under the dash and grounded it to the frame then my fuel pump primed and I had power to my dash...
...Possible harness ground wire is broken/bad connection...?? ECU ground is pin 21...see pictures
I found out it’s not from grounded that wire. It’s gets power to the dash when jiggling the wires under the hood but not all the time, I popped started it but if I give it gas or pull the clutch it just shuts off, could any of the sensors be causing this

Last edited by Austin21w; 06-28-2019 at 05:01 PM.
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