Quote:
Originally Posted by barry123400
Quick test. Shut off the return line from the injection pump and see if the idle is better. Indicated compression readings are not so far off that the idle should be noticeably bad from that anyways. If you have not checked for valve lash do so. I am assuming this is an older 617 engine that has mechanical lifters.
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The IP Return line is hard Plastic; there would be more luck with the Cigar Hose. If the Cigar Hose is old it will also be too hard and stiff just to pinch off.
He would be better off temporarily replacing the Cigar Hose with a section of 5/16" Fuel Hose; that can easily be pinched off with a Pliers or a Vice Grips.
If the idle gets better by pinching off the return Hose you have an issue with your Pressure Relief/Overflow Valve.
09-03-2012, 02:54 PM
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