throttel body backfire
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Joined: Jul 2006
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throttel body backfire
I have a 97 f150 with a 4.2 in it I did a open air intake mod and i changed the oxygen sensors,egr valve,the egr relay, and i cleaned out the intake system the throttel body and the mass air flow sensor and I'm still getting a back fire out of the throttel body. I'm also receiving edbII codes of 172,174,and 304 I checked the vacume lines with no leaks found. It runs rough at a idel and hesatates when I try to pull a way from a stop. I sea foamed the engine. Any help will be appreceated
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
Welcome to the forum 
How many miles on the spark plugs?
The P0304 is a misfire, quite likely caused by a bad plug or wire.
The P0172 means that bank 1 (passenger's side) of the engine is running too rich.
The P0174 means that bank 2 is running too lean.
Have you checked for vacuum leaks?
How many miles on the spark plugs?
The P0304 is a misfire, quite likely caused by a bad plug or wire.
The P0172 means that bank 1 (passenger's side) of the engine is running too rich.
The P0174 means that bank 2 is running too lean.
Have you checked for vacuum leaks?
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New User
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The plugs only have about 500 miles on them I moved the plyg and wire from the # 4 and I still have the code. I've checked for a vacum leak unless I'm missing a line I can't find one. I'm thinking about pulling the plug and cleaning it. If I clean The maf it clears up for short time.
