LOST OF POWER,ROUGH IDLE & WHEN GIVING IT GAS RPM'S DROP

  • Tiny
  • terrell brandon
  • 1993 Lexus GS 300
  • 204,000 miles

I was diving one day doing 60mph and all of sudden I could not accelerate and lost power coming from emission test that I passed. Ive just had a full tune up change mass air sensor no change, still no power and rough idle.

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Monday, September 19th, 2011 AT 10:46 PM

7 Replies

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,409 posts

Check catalytic converter for plugging, check for vacuum leaks, check fuel pump pressure.

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Tuesday, September 20th, 2011 AT 12:32 AM
  • Tiny
  • terrell brandon
  • Member

When I unplug the mass air flow sensor it idle & run the mass air flow is new out the box the second one I took the first one back because their was no change

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Tuesday, September 20th, 2011 AT 1:02 AM
  • Tiny
  • ronsellers
  • Member

It is your ECU Module. Probably got hit by severe heat. Typically it is the capacitors that need replacement on the board (less than $2) but you need a TV repair place to solder the new caps on board. $20 generally. The problem is finding where it is. This was ask before but was not answered. Instead they said check the battery cables. Lol

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Friday, September 23rd, 2011 AT 6:25 PM
  • Tiny
  • ronsellers
  • Member

Do this work?

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Friday, September 23rd, 2011 AT 6:26 PM
  • Tiny
  • ronsellers
  • Member

You could not accelerate because to ECU dropped you into Limp mode. You will need to downshift to run the car.

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Friday, September 23rd, 2011 AT 6:29 PM
  • Tiny
  • terrell brandon
  • Member

I will try that what do it look like & where is it located

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Friday, September 23rd, 2011 AT 6:57 PM
  • Tiny
  • terrell brandon
  • Member

Once agian same problem;now changed the ecu, full tune, checked the cats new vac hoses new mass air flow sensor and also change the complet throttle body & cleaned it car still wont idle rpms are low

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Saturday, October 1st, 2011 AT 6:34 PM

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