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 10 Severe lack of power (for 15 minutes after start) (Read 5377 times)
Dave W
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Re: Severe lack of power (for 15 minutes after start)
Reply #15 - Jan 8th, 2019 at 5:36pm
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One common vacuum leak that is very difficult to see or detect is the bottom of the first rib of the J-boot.  At idle, the crack may be sealed but any engine movement will open it up.
  

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C00lSub4ru
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Re: Severe lack of power (for 15 minutes after start)
Reply #16 - Jan 8th, 2019 at 9:41pm
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I looked for that with the j boot removed, definitely no cracks.

I have been burning tons of oil for years.  Could the catalytic converter be clogged with oil residue?  Maybe that’s why it clears up when I drive it on the highway.
  
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Dave W
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Re: Severe lack of power (for 15 minutes after start)
Reply #17 - Jan 8th, 2019 at 10:58pm
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that's easy enough to test.  loud but easy.  just disconnect the pipe and run it.

I have heard of people "washing" their cats to try to get the oil out of them.  I don't know how successful that is if you don't also address the oil issue.
  

Dave - black 84 no longer exists. Sad 83 self destructed. All better now. Smiley
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KGB
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Re: Severe lack of power (for 15 minutes after start)
Reply #18 - Jan 9th, 2019 at 8:59pm
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I'm certainly not an expert on this topic, but after going through my throttle body recently and the TPS, seems like that could be a possibility.  The butterfly on my throttle body was NOT opening and closing smoothly especially the first little bit of movement.  The TPS has wiggle room to adjust and the throttle body itself has two places to adjust the butterfly/air mixture..... just a thought.  Seems like the issues end-up being something pretty simple once they're discovered and corrected.  Good luck.  KB
  

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C00lSub4ru
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Re: Severe lack of power (for 15 minutes after start)
Reply #19 - May 24th, 2019 at 9:22pm
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So I sent it in about a month ago.  They flow tested the exhaust, catalytic converter isn't clogged.  They checked all the sensors were reading correctly, and cleaned the grounds.  The throttle body opens smoothly.  They suggested I send the ECU back, Specialized ECU bench tested it, and said it was good. I think that covers every idea I've had so far.

My garage is good they specialize in European cars.  They said the next thing to do is check the entire wiring loom and sensor cables for corrosion and possible shorts.  It's a big job they have to take off the intake manifold, but I did repair some cracked wires behind the speed/ref sensor last year so there could be more.

It's so weird because when I repaired those wires it ran great for like 3 months and then the problem reappeared in the exact same way.
  
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Dave W
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Re: Severe lack of power (for 15 minutes after start)
Reply #20 - May 28th, 2019 at 5:48pm
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You could try putting in new orings for the AOS.  That might be the oil issue.  Leaky seals there will cause oil in the throttle body as well as a vacuum leak.
  

Dave - black 84 no longer exists. Sad 83 self destructed. All better now. Smiley
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OhioTom
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Re: Severe lack of power (for 15 minutes after start)
Reply #21 - May 29th, 2019 at 8:20pm
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So, when you play and touch things, it works for a while, then falls back into poor running eventually.

That really sounds like a bad connnection somwhere.
you touch or wiggle it and it's good for a while.
Given time, it corrodes and degrades giving bad readings.

Things that can be affected by poor connections:
Temp sensor(s).
TPS (throttle position switch)
AFM


I would install a fuel pressure gage (even if only temporary) to ensure fuel pressure is correct under all driving conditions.

After that, I would do as your mechanic recommended and inspect every connnection for the: TPS, AFM, and temp sensors.
These are all low voltage, analog sensors that can be thrown off calibration by a failing connections.
  

Tom Simpson&&VW/Porsche freak.
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OhioTom
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Re: Severe lack of power (for 15 minutes after start)
Reply #22 - May 29th, 2019 at 8:22pm
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You could also try this:
Play with the wires to the temp sensor, then drive it. See if it changes how it runs.
Do the same for each sensor I have listed above.... one at a time to see if it affects how the car runs.
If you suddenly fix the problem by wiggling something, you can find it real fast like.

  

Tom Simpson&&VW/Porsche freak.
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darrellsp
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Re: Severe lack of power (for 15 minutes after start)
Reply #23 - May 30th, 2019 at 4:16pm
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I have been burning tons of oil for years.

Lots of good suggestions mentioned already. I have to say that I would be really concerned if the car is burning lots of oil for years!

That's a major problem Angry
  

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