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Why my RPM is getting down when engine is hot?

Tiny
SHUVO6745
  • MEMBER
  • 1995 TOYOTA
  • 50,000 MILES
My car is a SE vintage 110 model Toyota. When I drive for sometime and then if I start it again it took start but it does not shift from oil to cng. At the same time its rpm gets lower and it comes to 300 or 400 when I release the accelerator.
Sunday, May 13th, 2012 AT 8:28 AM

3 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
If your car is powered by CNG, you might have a pressure problem or injector problem. It gets worse when hot because the car is leaned out by the Idle air Control valve andthe inadequate pressure will not keeep the CNG running without the help of petrol. You need to check your injectors and CNG fuel management delivery system.
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Sunday, May 13th, 2012 AT 8:35 AM
Tiny
SHUVO6745
  • MEMBER
  • 2 POSTS
The same problem occurs in fuel as well. When I drive for 10-15mins after that if I stop in signal or anywhere its rpm gets down to 400. But in speed it doesn't give trouble.
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Sunday, May 13th, 2012 AT 9:15 AM
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
Sounds like a fuel pressure regulator problem.
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Sunday, May 13th, 2012 AT 10:24 AM

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