Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2005 F-150 low volumetric efficiency test

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4 years 8 months ago #32314 by Tyler
Ah yeah, even if you find something wrong, they're gonna want approval before you tear into it. :unsure:

You said you looked at the air filter? Seemed in decent shape? I've seen it where the filter doesn't provide laminar flow over the MAF, and ends up skewing the trims AND VE calculations. Removing the filter doesn't help.

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4 years 8 months ago #32315 by Cheryl
Brand new wix filter.

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4 years 8 months ago #32316 by Cheryl
Probably something simple.... watch it be he needs a motor craft brand filter. Lmao.

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4 years 8 months ago #32317 by Cheryl
Also wondering if there is any reflashes for the pcm to address this? The engine was blown when he bought it. The timing chain guide broke

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4 years 8 months ago - 4 years 8 months ago #32318 by Tyler

Cheryl wrote: Brand new wix filter.


Swing and a miss. :lol: I really don't like how the O2's still go lean at WOT. If it was just a VE issue (cat, intake), they'd be high. It screams air measurement issue, but there really doesn't seem to be one.

Am I missing anything here?
Last edit: 4 years 8 months ago by Tyler.

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4 years 8 months ago #32319 by Tyler
If you disconnect the MAF, does it run any better? O2's go high at WOT?

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4 years 8 months ago #32320 by Cheryl
Still sluggish with maf unplugged did that 2 days ago

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4 years 8 months ago #32321 by Cheryl
File trims go 20-25 both long and short whole time on the gas til you ease iff

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4 years 8 months ago #32434 by Cheryl
I think we are getting on the right track removed intake manifold again found a rag shoved in an intake runner. Plus he repaired the intake runner control wrong the intake runners were open at idle but closing at higher rpms. Had the rods reversed. So the pcm seen movement of the system but it was total backwards. Remind you I wasn’t there when I told him to pull the intake originally he said he moved the wiring harness because the rods originally different move as they were jammed

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4 years 8 months ago #32446 by Tyler
No wonder this thing couldn't breathe right. :silly: So how's the VE numbers after getting the intake straightened out? Did the O2's start behaving correctly?

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4 years 8 months ago #32451 by Noah
Good find!

"Ground cannot be checked with a 10mm socket"

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4 years 8 months ago #32476 by Cheryl
@ Tyler yep oxygen sensors still going lean. My baro hi pid went up from 133 to 153 hz. I’m in Ohio so now that pid is reading correct.

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4 years 8 months ago #32478 by Tyler
So the MAF reading is likely correct, then. Any better VE?

Perhaps the injectors are wrong for this engine. With correct fuel pressure and good VE, there's not much left.

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4 years 8 months ago #32479 by Cheryl
We’re going to get back on it tomorrow so hopefully I’ll post on here with good or bad news it’s All good news to me as I don’t own this thing

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