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Nov 19, 2006 | 05:09 PM

#16

eeyore150

Trailering

Joined: Jan 2006

Posts: 20

Likes: 0

From: New Berlin

I cleaned my MAF sensor and replaced my fuel filter last weekend. I previously could not run regular gas, and the truck still knocked too much on premium. I've run regular (I think 87 octane) since last weekend and it ocasionaly knocks if conditions are just right, but way better than even running premium before. I still have just a couple slight pings when it upshifts or if I hold it just short of allowing it to kick down. Anyway it's alot better, I'm not sure what to try next.

Dec 2, 2006 | 10:17 PM

#17

whimsey

Senior User

Joined: Feb 2004

Posts: 303

Likes: 0

From: "Garden State"

Spotty, I put the new IAT sensor in and finally was able to empty the 91 octane and fill with 87. I'm happy to report that my colder temp pinging on the same secondary roads has seemingly disappeared. Where it was pinging even with the 91 it doesn't ping now with the 87. I haven't had a chance to test it out on the highway yet but hope to shortly. The $42 for the sensor was well spent in my book. That is about the extra amount that 7 tanks of high test would cost. And it still pinged on high test before I replaced the sensor, only somewhat less than with regular.

Whimsey

Dec 4, 2006 | 08:16 AM

#18

Spotty

Thread Starter

Laughing Gas

Joined: Jan 2006

Posts: 1,098

Likes: 11

From: Minnesota

Whimsey, hope that it works out long term. After using 2 tanks of 89 octane I thought I would try the 87 stuff again. My truck had less power and mileage dropped about 1 mpg with the 89 stuff, but no trace of a ping. To my surprise I've ran several full tanks of gas ( about 85 gallons) of the 87 octane with no pinging. (OK, maybe a little now and then when it shifts to OD, but very light and not sustained. I will definitely change out the IAT sensor if the problem shows up again on a regular basis. I think this is a logical sensor to replace for this condition if all the other possibilities are taken care of first. Thanks for the reply, hopefully we have all learned a little from this post, and remember guys my truck gets worked each day hauling construction related stuff around in temperature from -20 degrees to 100 degrees, and always starts and runs strong and efficient. I think this is one of the best engines I have ever owned and at 53 years old I've had a lot of vehicles.

Happy Holidays.... Spotty..

Dec 4, 2006 | 05:27 PM

#19

apowder97

Freshman User

Joined: Feb 2005

Posts: 47

Likes: 0

Ok what's the IAT sensor?

Dec 4, 2006 | 05:49 PM

#20

whimsey

Senior User

Joined: Feb 2004

Posts: 303

Likes: 0

From: "Garden State"

Quote:

Originally Posted by apowder97

Ok what's the IAT sensor?

Intake Air Temperature sensor. In my 2002 F-150 with the 4.6L V-8 it's in the intake air bellows just after the MAF sensor.

Whimsey

Dec 4, 2006 | 05:51 PM

#21

apowder97

Freshman User

Joined: Feb 2005

Posts: 47

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Is this the same thing as the IAC? I'm asking because I have a light ping also.

Dec 4, 2006 | 05:54 PM

#22

whimsey

Senior User

Joined: Feb 2004

Posts: 303

Likes: 0

From: "Garden State"

Quote:

Originally Posted by apowder97

Is this the same thing as the IAC? I'm asking because I have a light ping also.

No, the IAC affects the idle speed and stalling when the throttle is closed.

Whimsey

Dec 4, 2006 | 05:59 PM

#23

Spotty

Thread Starter

Laughing Gas

Joined: Jan 2006

Posts: 1,098

Likes: 11

From: Minnesota

No, IAC is Idle Air Control. This controls the amount of air entering the throttle body-intake during idle, tough to associate this with "pinging" or detonation. If your truck starts and dies but you can keep it running by depressing the accelerator, that could be a symtom of a faulty IAC.

Spotty..