Hi guys, great forum and site, long time lurker.
2001 Jeep Cherokee Sport, 142k miles, 4.0L/Auto, purchased truck at Auction, has a Jasper replacement engine sticker under the hood. No check engine lights on at the time of purchase but was running rough. ( always expect this at auction)
Got the Truck home, someone was nice enough to unclip 2 of the injector plugs. So plugged them back in and running better but still rough. Here is what i did so far.
CHECK ENGINE LIGHT FOR CYL 4 Misfire and a P0455 Gross Vac Leak
-Replaced Computer
-Replaced CYl 4 Injector
-Replaced Cyl 4 Spark Plug
-Replaced Coil Rail with a good working used one
What is left? Bad valve spring? Rocker? Pushrod?
It runs smoother now throughout the rpm range, but studders at idle, before it would not rev out over 3000 rpm without hitting like a 2 step.
Thanks
2001 Jeep Cherokee Sport, 142k miles, 4.0L/Auto, purchased truck at Auction, has a Jasper replacement engine sticker under the hood. No check engine lights on at the time of purchase but was running rough. ( always expect this at auction)
Got the Truck home, someone was nice enough to unclip 2 of the injector plugs. So plugged them back in and running better but still rough. Here is what i did so far.
CHECK ENGINE LIGHT FOR CYL 4 Misfire and a P0455 Gross Vac Leak
-Replaced Computer
-Replaced CYl 4 Injector
-Replaced Cyl 4 Spark Plug
-Replaced Coil Rail with a good working used one
What is left? Bad valve spring? Rocker? Pushrod?
It runs smoother now throughout the rpm range, but studders at idle, before it would not rev out over 3000 rpm without hitting like a 2 step.
Thanks
2001 Cherokee Sport, Need Diag Input
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