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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
Seems to me that if the return line is clogged or restricted then fuel will have no where to go so hydraulic control pressure pushing the fuel metering piston down will go just as high as maximum fuel pump delivery system pressure. I may be wrong though.

If that happens the air flow sensor plate may stay near idle speed position when you push the go pedal to the floor.

Then when you're totally sick of CIS... you may just rip the obsolete crap off and install electronic fuel injection.
Old 10-25-2017, 01:46 PM
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