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Re: Infiniti J30 1995 Aceleration problem
Hello! A quick suggestion, could your Catalytic converter be blocked/collapsed. This would restrict the full flow of exhaust gasses from the engine thus causing severe lack of power.
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The two most common failures in torque converters are excessive slipping due to bad seals and locking problems. If the torque converter is slipping, you will have poor acceleration, but the engine will rev up quickly. It is especially noticeable on hill climbs; engine RPM will be high, but the vehicle does not go as fast as it should, and in severe cases may not be able to climb the hill.
Lockup problems may be harder to detect. At highway speeds, most modern torque converters have a locking mechanism to eliminate slip. Failure to lock may not be noticeable except as a decline in highway fuel mileage. Failure to unlock is readily apparent; the engine may stall on deceleration, or hard braking is required to slow the vehicle, which then stalls.
cat converter is going bad. have someone rev engine and feel for pressure at tailpipe. i am willing to bet its restricted. did you have the egr fail code? egr valves hardly ever go bad. a bad cat converter will not allow for normal aceleration, even with the pedal to the floor.