Engine backfires when i let off the throttle and begin to slow down. it is a standard transmission. when i push in the clutch it doesnt but sometimes dies. it does the backfire thing especially when towing trailer and using the engine to slow me down.
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Well, it would shift easily with engine off, because the transmission input shaft is not turning. Engine running and clutch engaging good, the input shaft would again be stationary and allow smooth shifting. What you have to determine is if the clutch disc or pressure plate is bad (a new clutch is needed), or if the pedal hydraulic system has a malfunction. When you push the pedal down, a rod from the top of pedal pushes into the clutch master cylinder bolted to the firewall under the hood. This cylinder has a reservoir filled with brake fluid. When the rod forces fluid from the clutch master down a steel line and into the clutch slave cylinder down on the transmission bell housing, the hydraulic pressure forces a plunger from the slave cylinder to extend and push the clutch fork lever a small amount, enough to force the clutch release bearing (aka throw-out bearing) against the pressure plate. This relieves pressure on the clutch disc and input shaft becomes stationary for easy shifting.
The overrun clutch solenoid valve is activated by the Transmission Control Module (TCM) in response to signals sent from the Park/Neutral Position (PNP) switch, overdrive control switch, vehicle speed and Engine Control Module (ECM).