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Engine lack of power?

Tiny
SUNSHINE86
  • MEMBER
  • 36 POSTS
But, I'm going to be doing them sensors later today and will get back to you. Starting to wonder if it's not the PCM itself. D oh sent make sense. Been testing and it seems as if I start it shut it off and start it again and it runs like it should.
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
Anything is possible. When you turn the key off, it could be resetting things. I just want to recap. You checked fuel pressure, codes, and wiring for grounds and power supplies, correct?

Joe
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
SUNSHINE86
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  • 36 POSTS
Yes, it seems as if it resets itself after restart. Yes on fuel pressure. Yes on codes. Yes on grounds. I'm a little rusty with the power supplies. That area I really don't know anything.
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
The one thing that I can think of that under the right conditions won't set a code, but it can cause driveability issues is the crank sensor. Have you done anything with that? Take a look through these two links and let me know if anything seems to mirror what you are experiencing:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Joe
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
SUNSHINE86
  • MEMBER
  • 36 POSTS
Yes it idles high when cold. Sometimes you got hold key until it finally fires. It'll crank but not always fire up. Intermittent stalling yes. Sounds to me I might need a crankshaft sensor. I'll see if parts store has one. Fingers crossed.
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
SUNSHINE86
  • MEMBER
  • 36 POSTS
Yes it idles high when cold. Sometimes you got hold key til it finally fires. It'll crank but not always fire up. Intermittion stalling yes. Sounds to me I might need a crankshaft sensor. Wait I already replaced the crankshaft position sensor. That was the very first thing I dif
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
You mentioned that you were getting a live data scanner. Do me a favor, check the coolant temperature sensor reading, let me know the short term fuel trims, and if you haven't, (and I think you did) reconfirm there are no vacuum leaks.

I am starting to question if there is a problem with the idle air control valve. Most can be serviced, but this one can't.

The info from the live data scanner may be very helpful. We spoke about it a few posts back but then stopped.

Let me know.
Joe
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Tuesday, December 15th, 2020 AT 12:21 PM (Merged)

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