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Re: Help 97 truck popping through the exhaust
Make sure the sensor by the crank and harmonic damper are clean, Spark plugs fail under load when they fail (usually) coils will fail intermidently. popping when not on the throttle going down hill or just under light throttle is usually caused by valve float (weak valve springs). another possibility is a small exhaust leak, when the scavenging effect takes place in the exhaust it creates vacuum which can suck in fresh air if that lights in the mufflers it pops (unburnt fuel plus heat plus fresh air in closed compartment equals boom or just repetative popping) My toyota used to do this all the time sometimes if it was cold enough when I let off the throttle I could get the shotgun effect
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