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ZX1100F1 -> RE: '99 z71 oxygen Sensor or Bad Vaccum Hose Help? (1/19/2008 12:05:50 PM)
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With those codes and the age and mileage on the motor it needs much more then a simple tune-up although a new set of plugs and a thorough fuel injector system cleaning would be a good place to start, although I would take an OHM reading on the (high tension) plug wires before I decided to replace them, if any wire reads over 30,000 ohms then replace them all. Bad intake manifold gaskets (can make a hissing noise) and is a common problem on these engines (I'm going to guess that you have a 1500 model with either a 4.8L or 5.3L V8), there are very few vacuum hoses on these engines and they are very easy to remove and inspect. There are also two places where the ground leads can come loose or corrode, one is the Electronic Brake Control Module (EBCM) underneath the drivers door on the frame, look for the heaviest gauge ground wire that is attached to the frame and unbolt it, use a wire wheel to thoroughly clean the contacts and replace the bolt/nut and washer with like sizes and tighten it all down, this could solve your ABS and Park light. Another ground wire is on the passenger side head of the engine, at the front just below the plastic oil spout, basically you want to remove the hardware and clean everything up and put it back together, this can cure some of your other DTC's. Dump Six 12oz bottles of Chevron Techron fuel system cleaner in a full tank of gas and run it out, this does a remarkabe job at cleaning things up. Dave
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