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#1
08-16-2006, 06:48 PM
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Won't go above 45 MPH
A buddy of mine recently purchased an '80 or '81 Trans Am that had been in storage for 9 or 10 years. The car has low miles and was owned by an older lady since new. The problem is that the car won't go above 45 MPH??? It has good take off but once it gets to 40 to 45 is bogs down. He's talked to two mechanics and they both said it needs a motor rebuild at a cost of $5K. He said the oils clean, it doesn't blow smoke and there's no apparent leaks anywhere. Are there any emissions controls that might be holding this car back?? Anybody else ever experience this before? I just find it hard to believe that it would need a motor rebuild from sitting for 9 years. I could see the valve seals needing to be replaced but that shouldn't cause the car to bog at 45.
Thanks for any suggestions. Mike 
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#2
08-16-2006, 06:51 PM
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Re: Won't go above 45 MPH
I had a car that did this.
It was the Exhaust Heat riser that was stuck closed. Check the C.C.,or maybe a dead mouse in the tailpipe?
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#3
08-16-2006, 06:55 PM
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Re: Won't go above 45 MPH
Mike,,,It sounds like the catalytic convertor is plugged. I would go there first..........Bill S
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#6
08-16-2006, 07:12 PM
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Re: Won't go above 45 MPH
I knew you guys would have some answers....thanks for the info.
 I'll forward your suggestions and see if he can fix the problem.Mike
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#7
08-16-2006, 07:41 PM
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Re: Won't go above 45 MPH
I had this happen on an '86 Trans Am - it was a blocked cat converter. It's easy to test, just drop the pipe - and go for a noisy test ride
 BTW: eventually, it will get worse to the point that it won't run at all - especially after it gets hot. The cat will completely block off the exhaust until it cools down.
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Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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#10
08-17-2006, 10:03 AM
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Re: Won't go above 45 MPH
I gotta chime in on the plugged CAT. My sisters '87 Buick had the same symptoms. The CAT was choking the life out of it. It was like a new car when it got replaced. And it was a lot cheaper than rebuilding the engine.
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Mark 1966 L72, 4spd Caprice 1974 Z28, M40 Camaro
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