We have had a Toyota 7FGU35 for 2 years. When we got the machine our maintenance guy replaced the throttle stop with a longer bolt to limit the speed. I know that wasn't the right way to do it but can this cause the 3-way cat. to fail? Our Dealer is saying that by adjusting the throttle stop the cat. converter can't heat up enough to work properly. This truck idles 75% of the time and never travels more than 100'. We have a full maintenance contract but they want us to pay $2200 for the catalytic converter replacement.
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