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C2500 Suburban

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Question
The car is from California and the smog pump was removed, runs poorly.
The smog pump blows clean air into the exhaust until the engine reaches operating temperature. Once the exhaust gets hot enough, the extra air isn't required to lower tailpipe emissions and a valve opens to divert the air away from...
Question
Backfire - 1993 GMC C2500 Suburban
Hello, thanks for writing in. The engine should be checked to make sure it has spark from the coil. If not, then check the coil for a signal from the ignition module and replace the ignition module and coil. If...

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