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mryoc
mryoc 9/2/2011
2001 Jeep Grand Cherokee Laredo 6Cyl4.0L - Engine
hard starting cold only
new coil pack and spark plugs
2 Answers
  • yboy82
    yboy82 9/2/2011
    Did you already check the fuel pressure of your vehicle? It is possible that your fuel injector pressure regulator and/or fuel injector cold start valve is faulty/damaged.
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  • yboy82
    yboy82 9/2/2011
    The fuel pressure should be 44.2 to 54.2 psi while the engine is running at idle speed.
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