I have an '89 Cherokee Laredo 4.0. I had it inspected the other day and it failed emissions - hydrocarbons too high. The mechanic doing the inspection disabled the EGR system by unplugging the vacuum supply to the vacuum solenoid and ran it on the dyno again and it passed - HC came down to almost nothing and CO and NOx were still well below limits. After seeing these readings I decided to leave the EGR disabled and see if it runs any differently. It runs better than it ever did with more power. Prior to this I was having to keep the idle speed at 1000 RPM just to keep the engine from stuttering and stalling on take off and I was only getting about 13 miles to a gallon of gas. With the EGR disabled I turned the idle back down to normal ( 600 RPM ) and have no problems at all, like I said it runs better than it ever did. I still have to wait and see what the gas mileage is now. What I need to know is, should I leave the EGR disabled, is it safe to do so, and if not then what is the solution?
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