Overdrive
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Joined: Apr 2010
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Overdrive
Hi to all
I am new here , my wife has a 2005 F 150 4x4 239000 KM , rebuilt tranny. 4.6 liter.
A few weeks ago while exiting the highway from a speed of 100 KM to around 85 KM in Overdrive she went to speed up a little and it seemed that it could not get out of overdrive , bucking or surging. it happens on and off not all the time .
Brought it to a tranny shop, they test drove it and found nothing it did not do what we explained.
It has the 4.6 motor , lacks power by a mile. shop suggested Catylatic converters may be pluggeg . if the back pressure is restricted can it effect the way the tranny shifts
need help . don't know who to take it to what should we do next.
thanks
Al
I am new here , my wife has a 2005 F 150 4x4 239000 KM , rebuilt tranny. 4.6 liter.
A few weeks ago while exiting the highway from a speed of 100 KM to around 85 KM in Overdrive she went to speed up a little and it seemed that it could not get out of overdrive , bucking or surging. it happens on and off not all the time .
Brought it to a tranny shop, they test drove it and found nothing it did not do what we explained.
It has the 4.6 motor , lacks power by a mile. shop suggested Catylatic converters may be pluggeg . if the back pressure is restricted can it effect the way the tranny shifts
need help . don't know who to take it to what should we do next.
thanks
Al
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
The truck does have a significant number of miles on it, usually 100,000 miles is the basic life expectancy of a catalytic converter, and you're at basically 150,000miles. Depending on maintenance and history, a misfire or oil burning can foul the cats pretty quick.
There are two fairly easy DIY tests to check the general health of the cats- The first is temperature. Using a non contact pyrometer (aka infrared thermometer), check the temperature of the pipe before and after the cat immediately after a drive. The outlet should be about 100ºF hotter than the inlet. The second test is the sound- If you get a good burbly V8 rumble, chances are it's fine. If it sounds like it's hissing through a straw, then the cat is plugged.
There are two fairly easy DIY tests to check the general health of the cats- The first is temperature. Using a non contact pyrometer (aka infrared thermometer), check the temperature of the pipe before and after the cat immediately after a drive. The outlet should be about 100ºF hotter than the inlet. The second test is the sound- If you get a good burbly V8 rumble, chances are it's fine. If it sounds like it's hissing through a straw, then the cat is plugged.
