Jump to content
Sign in to follow this  
topazsparrow

Air pressure sensor causing RPM to surge

Recommended Posts

topazsparrow
I'm not sure if it's due to the FTECU Auto-tune package (it was fine for a week before I took the baffle out of the akra), or if it's because I took the snorkel out, but my bike hasn't been able to hold a steady idle for a while now.
 
It'll dip down to 1000 rpm frequently and actually caused a stall a few times.
 
I thought it was the TB sync, but discovered after removing the line to the intake pressure sensor that the surging went away (and the CEL came on, but that's to be expected). You need a special tester harness to test the sensor, so I wanted to check here to see if anyone else has run into a similar idle surging issue with either the FTECU Auto Tune package or the removal of the snorkel.
 
 
 

Share this post


Link to post
Share on other sites
norcal616
I got better tuning results with baffle in... something about getting smoother AFR readings at the wideband sensor
 
Myself and another member have been trading PM for last 4-5months with running the auto tune from PVC...many diffrent experiments and brainstorming...
 
Check the clutch safety switch...

Share this post


Link to post
Share on other sites
farble

I had surging at idle, and fault code 13, which is the air intake pressure sensor. Fortunately got it to the dealer just before warranty expired. They eventually tested that sensor and found it was bad. I was wondering if there was any mention of the problem on this forum, and found this posting.

 

 

It took the mechanic a long time to diagnose the problem. He was distracted by all the accessory wiring I added, for usb charger, heated grips, plug for heated vest, relay. He felt he had to check all that first. Service manager called to tell me they had put $200 labor into it already and only found a problem with the connector to the accessory circuit. I immediately went to the shop to see what they were talking about. I figure the mechanic pulled the wire out of the connector when disconnecting it for testing.  I remember having a problem building that connector with the pins not clicking into place. The mechanic had a kit for making those connectors, so he remade it.

 

After they put it all back together, and found the engine still didn't run right, they discovered the sensor problem and said there would be no charge for the service.

 

If I was the mechanic, I probably would have checked my wiring first, too. I did that when the accessories stopped working. Pulled it all apart and then discovered that a short in the USB charger itself was blowing the fuse. My wiring was ok.

Share this post


Link to post
Share on other sites
DewMan
48 minutes ago, farble said:

If I was the mechanic, I probably would have checked my wiring first, too. I did that when the accessories stopped working. Pulled it all apart and then discovered that a short in the USB charger itself was blowing the fuse. My wiring was ok.

I fear the reason they may have checked all your wiring first was so that if they were lucky enough to find the issue there... it wouldn't be covered under warrantee and they could stick you with the bill.

  • Like 1

Share this post


Link to post
Share on other sites
farble
7 hours ago, DewMan said:

I fear the reason they may have checked all your wiring first was so that if they were lucky enough to find the issue there... it wouldn't be covered under warrantee and they could stick you with the bill.

The service manual says to "check the  wiring harness" before testing the sensor. I hope the dealer gets paid by Yamaha for warranty service, but maybe less than what they would charge me.

Share this post


Link to post
Share on other sites
DewMan
1 hour ago, farble said:

The service manual says to "check the  wiring harness" before testing the sensor. I hope the dealer gets paid by Yamaha for warranty service, but maybe less than what they would charge me.

I'm sure the manual does, but when I was a mechanic I'd have swapped out the sensor first to see if the code goes away and if it didn't, then start trouble-shooting the harness. But then it was 30 years ago when I was a MC mechanic so take that with a grain of salt. ✌️ Glad they were able to resolve the issue for you at no cost to you.

 

OP, Sorry for the hijack. :) 

Edited by DewMan

Share this post


Link to post
Share on other sites
CarGuy7a

I doubt that removing the snorkel is causing your problems. There's alot of us here who have removed it without any adverse affects. I would say you have a bad sensor if the problem stops when you unplug it.

 

Here's a snapshot of the manual on how to test it. I'm not sure if you can do this with a regular mutlimeter or not but it's worth a shot.

manual 1.jpg

Edited by CarGuy7a

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  


×

Important Information

By using this site, you agree to our Terms of Use.