General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

P1151 and P1131 codes after replacing fuel injectors

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Old 02-10-2019
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Location: Fredericksburg, Virginia
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P1151 and P1131 codes after replacing fuel injectors

Hello Iíve got a 1998 4.0 and I was having an issue with the truck bucking in 3,4 and 5 th gear when under a load (going up hills). I had 071 codes before and replaced coil packs,wires, fuel filter, spark plugs and check the pressure on the rail. Fuel pressure was good even while driving and bucking. So I figured next step would be fuel injectors. I replaced them yesterday while doing the injectors I replaced upper intake gaskets and torqued the studs to the proper ft pounds and in proper sequence. When I first backed it out of the shop and took it for a spin it acted perfect. Set cruise control went up hills in all gears did great. After driving for awhile it began to hesitate and miss unless giving it full throttle. Itís in and out sometimes it runs perfect sometimes it will sputter and hesitate. The CEL came on and Iím now having P1151 and P1131 codes truck also smells funny after being driven. Is it possible my injector connections are loose on a couple of them? Or is it more likely I have bad oxygen sensors?
 
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