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F150 No code intermittent misfire issues
- bills4065
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- 52Tele
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Temp 143.6
voltage 1.026
Manifold absolute Pressure
Pressure 14.2137
Voltage 3.982
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- bills4065
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- 52Tele
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The pressure part of the sensor seems most the time to read accurately but the intake temperature portion of the sensor doesn't seem right to me.
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- Hardtopdr2
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- bills4065
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- 52Tele
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- bills4065
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- 52Tele
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- Noah
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- Give code definitions with numbers!
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I have heard instructor John Forrow say that restricted catalytic converters can raise IAT to temperatures that you would not typically find. I have not used this method to diagnose a restricted exhaust, but it sounds plausible.
Regarding VVT as Tyler mentioned earlier, there are VVT error pods for each bank. You really only want to see a degree or two of error and only momentarily when changing rpm. Steadily higher numbers of degrees of error indicate VVT issues.
"Ground cannot be checked with a 10mm socket"
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- 52Tele
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Thanks again everyone
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- 52Tele
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- bills4065
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- 52Tele
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Just where everyone gets where I'm coming from I'm not leaning in a specific direction myself currently. Just trying to look at all data and then pick a path. I believe it could be fuel related but I also believe it could be vct related.
I also haven't ruled out computer related issues. During all this happening I borrowed a friend's bluedriver for a while and noticed when graphing data I had random times when signal would drop out or certain sensors would spike or dip to levels that wouldn't be possible. For instance engine coolant temp dip to 32 degrees F and then go back to normal range. It would happen on a few sensors at the same time.
Also during that time I had a redtop optima battery that started leaking and knew that wasn't supposed to happen. On their website it stated if one was leaking it was most likely from an alternator over charging. I checked the alternator and it was operating correctly so I replaced the battery.
Another reason I had some computer concerns were that my factory plugs when I replaced them the gaps were a good bit out of spec and I had heard of coils being stressed and damaging the computer. So again multiple concerns and I've done a lot checking but just trying to find the right path.
Sorry for the long post
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- 52Tele
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I just luckily caught this
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