2001 Ford expedition 4.6 L very very rich condition
- Columbus450
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Came into my shop because of a bad misfire They changed all coil packs, Injectors , spark plugs
Truck is running on only four cylinders raw fuel coming out of tailpipe, this is what I have done
Looking at the vehicle the right bank is not contributing whatsoever left Bank is, fuel pressure 30 psi vacuum line unplugged off a regulator jumps up to 40 psi it is within spec,all 12 Injectors have 12 V and are ground side switch pulsing none of the injectors are shorted to ground that was the first thing I checked
Next all coil packs are working the way they are supposed to firing on all 8
I did notice the right bank spark plugs were fouled out
I was thinking it could be a compression issue on that one whole bank there is no fuel in my coolant system also no pressure developing in coolant reservoir I have not done a compression test yet
Plugged scanner fuel trims looked normal no compensation
Have you guys have any experience with this issue, Only fault codes was for O2 sensor
only thing I have left is compression and check timing
What are your guys thoughts scanner Danner says he has not seen a injector stuck mechanically open
?? But I guess that doesn’t mean it can’t happen
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A clear flood cranking test will likely make a compression problem obvious. If this is a 4.6L without VVT, then it's possible to have a timing concern that can't be picked up by the PCM.
Which O2 code was it? You can eliminate an O2 concern by noting of the engine runs badly while in open loop.
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- Columbus450
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2001 Ford expedition 4.6 L
I do not remember which O2 code it was I have to check it again Also not sure on open loop or closed loop I will check that tonight
I’m not very familiar with what open or Closed Loop,means yet honestly
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That means that if the engine is running on four cylinders immediately after startup, then it's likely ths O2's aren't involved in the problem.
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- Columbus450
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But I did physically unplug all eight injectors and there is very much a big inconsistency in the cylinders check out this video
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- Columbus450
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- Columbus450
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Here
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- Columbus450
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A relative compression test with a scope and a sync on #1 would be best if you have a scope available. If not, I'd start with a compression test in one cylinder of each bank. If we're on the right track, the results should be obvious.
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- Columbus450
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Yes I will Pin into number one plug wire and watch wave form should be very interesting
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This is a capture I took off a Suburban with (obvious) compression issues. Since you have a Modis Edge, you can pretty much copy the settings for channel #1 and get in the ballpark.
Channel #2 is gonna be different for you, since you're triggering off a COP instead of a plug wire. 50 or 100V scale with Peak Detect is what you'll want.
Eager to see the results!
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- Columbus450
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Thanks a lot for the wave form!!!
I will keep you updated on what I find
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The voltage relative compression is super handy when you don't have an amp clamp around, OR it's difficult to get the jaws of your clamp around the battery cable you want. I've been using it more and more.
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- Columbus450
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I received plenty of returns from Google with south main auto but the one that stuck out is this one by the man himself scannerdanner,
www.google.com/url?sa=t&source=web&rct=j...TJzWxrN8ZFOD4xbU2nov
Hope it loads up correctly and helps as well.
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Edit;
Adding a screenshot of the video and more related videos in the text below which would be the description area below the video normally. Wonder if it's because I'm on my mobile decide that the links won't post as clickable or if the site has them disabled by chance for security reasons?
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