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Lost of power, rough idle & when giving it gas RPM's drop

Tiny
TERRELL BRANDON
  • MEMBER
  • 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.
Monday, September 19th, 2011 AT 10:46 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 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
  • 15 POSTS
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
  • 3 POSTS
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
  • 3 POSTS
Do this work?
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Friday, September 23rd, 2011 AT 6:26 PM
Tiny
RONSELLERS
  • MEMBER
  • 3 POSTS
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
  • 15 POSTS
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
  • 15 POSTS
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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