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mryoc

mryoc 9/2/2011

2001 Jeep Grand Cherokee Laredo 6 Cyl 4.0L

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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