Engine Knock and Stutter
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New User
Joined: Jan 2007
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Engine Knock and Stutter
I have a 2000 F150 with a 4.2l v6, Standard w/116k miles. My engine jumps or stutters at high speed. It kind feels like its missing. I first noticed the problem going up a small hill on the interstate, I was going About 60. The problem got worse and it started dying when i slowed to turn or stop. It threw code stating the system was too rich on both banks, I have replaced the plugs, fuel filter, cleaned the MAF and replaced all four O2 sensors, It no long dies when i go to turn or stop, but it still stutters and jumps and the engine knock has increased. And is still throwing the codes stating too rich on both banks. PO 172 and PO 175. Any ideas on where to look next would be appreciated.
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Temp sensor? Could be bad and it's reading very cold while trying to richen the fuel to warm the engine up..... Do a fuel pressure test to see if you have a stuck injector? Leave it for a bit and see if the pressure drops at all. Possibly stuck EGR?
Junior User
Joined: Nov 2005
Posts: 93
Likes: 1
From: Central Valley, CA
Originally Posted by Wilber15
Temp sensor? Could be bad and it's reading very cold while trying to richen the fuel to warm the engine up..... Do a fuel pressure test to see if you have a stuck injector? Leave it for a bit and see if the pressure drops at all. Possibly stuck EGR?
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