dustindu4

I was getting the p2106 code a lot and the same thing was happening to me. I brought it in and they replaced the throttle position sensor and it hasnt happened again since

wild stray

Sometime after I changed gears, I received a new tune, (which my tuner forgot to factor in the changed gears), and I was throwing a P2106 and the car was going into failsafe. What mods do you have?

Shifty

My local shop did the tune.

Shifty

I got new wheels/tires. They ARE a different diameter than the stock.

wild stray

I doubt the tires would make enough difference to put you into failsafe. I would take the car back to the tuner and explain what is happening. (I finally dropped my local and went to Bama Chips ) and havn't had any problems since.

If the tuner is sure the tune is correct, than you may have the same problem Dustin experienced with his car.

GIG4FUN

You will find that staying out of the throttle keeps you in closed loop. I believe it needs to make a certain temperature within 2 minutes as well. It should only get pissy when it runs from the mapped parameters which I believe is about 75% throttle tip in and above. When it does that, the Sensors will find issues.

I won't rule out your tire size issues. If you think about it, You have sensors off the trans and also sensors at the wheels (and perhaps in the carrier) and if something isn't jiving with the PC program it will know something is amiss. I would expect it to have a sense of knowing skid/slip conditions with their threshold "known' and you may run outside this with the tire size changed.

Shifty

Is the Vehicle Speed Sensor related to the TPS sensor in anyway? My new rear tire setup has a smaller diameter than my stock tires so it could be seeing the tires rotating at a different speed than normal? I'll call the shop tommorow and have them adjust my speedo for my tires (something I never did, DOH!). I'll also see how the car does tonight on the stock tune + cleaned intake.

Shifty

Ok I just looked and my car was made in 1/05 so the TSB on the TPS sensors does not apply to me. My bet is on the wheel/tire thing.

wild stray

Jake, how much did you drop in tire size? I have run 40/17's and not had a problem. If you're running lessor tire diameter than that, I would agree, the tire size may cause a problem. The tuner will need to adjust for the speedo and also the fuel tables.

Paul

don_w

I have a hard time buying into tire size being a problem. I have street tires and track tires, and change back and forth on average about once a week. And neither of them are near the size of the stock tires (street tires are bigger/track tires are smaller). Plus, I have 4.10s installed. And I have had zero problems with any codes or failsafe issues.

dustindu4

GET THE THROTTLE POSITION SENSOR REPLACED!

http://forums.bradbarnett.net/index.php?sh...138&hl=failsafe

P2106 is a throttle problem, not a wheel problem

Shifty

It's not much they're 305/35/18.

Shifty

I think I'll drop my car off tommorow if a dealer is open. What did you do as far as your tuner for taking it to the dealer? I'm worried they're gonna turn me away because of my K&N.

The thing that gets me is my car wasn't built early enough to be part of that TSB and I'm not getting any codes most of the time. When I do get a code it's just the P2106, not the others.

Shifty

Ok I took it to the dealer and they're saying that they're gonna replace the whole throttle body. Whatever, as long as it's free .

stang9325

Tried a search but couldn't find what I needed and didn't want to start a new thread for a minor question.

What exactly is failsafe mode? I'm guessing it isn't the CEL, but something different. Also, where can you find the definitions for error codes?

Shifty

Failsafe is also known as "limp mode". It's where the car cuts power and a bunch of other things so you can basicly crawl back to the shop. It goes into failsafe because it sees something wrong. Most of the time there will be a CEL but in my case there wasn't most of the time. I found what the codes meant just by googling them but I bet theres a list somewhere.

stang9325

Thanks for the info shifty and sorry for the noob question

WarningSLO

After I got my intake & tune installed, I wen't into failsafe mode as soon as I made my first hard shift. I read around a bit here, and heard about raising the idle rpm speed and neutral rpm speed.

It works, no more failsafe... but now I idle at 1200 rpm's all the time. LAME. I am switching tuners and waiting for a new XTR file from Doug @ Bamachips. Hopefully his tune will fix my problem.

wild stray

http://www.diablosport.com/FordDTC.php

dustindu4

believe me, you'll know what it is when it happens