Joined
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40 Posts
Long time lurker here.
Had to renew the tags on the Bronco a few weeks ago and failed due to a bad cat. Replaced the cat and passed, but, shortly after it started not wanting to idle while cold, misfiring, backfiring/popping can be heard via the intake/throttle body and can smell fuel.
So far we've replaced plugs, wires, distributor cap and rotor. TPS has been cleaned/tested and is within spec.
All the vacuum lines have been replaced with 5/32 rubber lines.
MAP has been tested using the procedure outlined here: Part 1 -Manifold Absolute Pressure MAP Sensor Test (Ford 4.9L, 5.0L, 5.8L) . Hz reading slowly decreased as it should when vacuum was applied and slowly increased as vacuum was released.
Only thing to note on it is spec says 152Hz at 0 Hg and this MAP started at 139Hz...however, it decreased in Hz proportionately as described in the procedure.
I'm now trying to replace the O2 sensor and I can't for the life of me figure out a way to get enough room to apply enough force to break it loose. I'm using a O2 socket and the sensor has been well soaked in lubricant...but, no matter which angle I come at it (underneath at an angle through the fenderwell or directly underneath between the transmission pan and dipstick tube) with only 2"-3" of room to move the ratchet, it'll never come off.
Is there some secret to getting to this thing that I'm missing?
I haven't pulled codes yet as the battery was disconnected before the tune up (my bad)...will be taking it for a spin here in a bit to try and get it to throw them. No CEL/"Emissions" light has come on since the problem started.
Any ideas or suggestions here would be greatly appreciated!
Had to renew the tags on the Bronco a few weeks ago and failed due to a bad cat. Replaced the cat and passed, but, shortly after it started not wanting to idle while cold, misfiring, backfiring/popping can be heard via the intake/throttle body and can smell fuel.
So far we've replaced plugs, wires, distributor cap and rotor. TPS has been cleaned/tested and is within spec.
All the vacuum lines have been replaced with 5/32 rubber lines.
MAP has been tested using the procedure outlined here: Part 1 -Manifold Absolute Pressure MAP Sensor Test (Ford 4.9L, 5.0L, 5.8L) . Hz reading slowly decreased as it should when vacuum was applied and slowly increased as vacuum was released.
Only thing to note on it is spec says 152Hz at 0 Hg and this MAP started at 139Hz...however, it decreased in Hz proportionately as described in the procedure.
I'm now trying to replace the O2 sensor and I can't for the life of me figure out a way to get enough room to apply enough force to break it loose. I'm using a O2 socket and the sensor has been well soaked in lubricant...but, no matter which angle I come at it (underneath at an angle through the fenderwell or directly underneath between the transmission pan and dipstick tube) with only 2"-3" of room to move the ratchet, it'll never come off.
Is there some secret to getting to this thing that I'm missing?
I haven't pulled codes yet as the battery was disconnected before the tune up (my bad)...will be taking it for a spin here in a bit to try and get it to throw them. No CEL/"Emissions" light has come on since the problem started.
Any ideas or suggestions here would be greatly appreciated!