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SportTrac Discussion
Engine & Drivetrain
Exhaust system backpressure
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<blockquote data-quote="scott degroot" data-source="post: 965417" data-attributes="member: 66039"><p>When cats plug the most obvious sympton is that the vehicle will just not accelerate when getting on it hard...the motor will try to rev but the vehicle just won't accelerate, alot of techs go chasing the maf for this issue as it can act the same way as a plugged cat, and sometimes is accompanied by what some describe as a jet engine sound coming out the exhaust. Typically a plugged cat is not noticeable at idle and the vehicle will still continue to cruise ok once it gets up to speed. Some of the GM midsize cars are notorious for plugging cats and the usual customer complaint is that the car won't move when getting on it hard but drives fine otherwise with no other symptons, on these vehicles I have seen as high as 30 psi of backpressure in the exhaust on a wot run but surprisingly they still somewhat accelerate and while cruising backpressure readings are normal</p></blockquote><p></p>
[QUOTE="scott degroot, post: 965417, member: 66039"] When cats plug the most obvious sympton is that the vehicle will just not accelerate when getting on it hard...the motor will try to rev but the vehicle just won't accelerate, alot of techs go chasing the maf for this issue as it can act the same way as a plugged cat, and sometimes is accompanied by what some describe as a jet engine sound coming out the exhaust. Typically a plugged cat is not noticeable at idle and the vehicle will still continue to cruise ok once it gets up to speed. Some of the GM midsize cars are notorious for plugging cats and the usual customer complaint is that the car won't move when getting on it hard but drives fine otherwise with no other symptons, on these vehicles I have seen as high as 30 psi of backpressure in the exhaust on a wot run but surprisingly they still somewhat accelerate and while cruising backpressure readings are normal [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Exhaust system backpressure
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