1999 Mitsubishi Eclipse RPM is bouncing

Tiny
KRYPTECLIPSE
  • MEMBER
  • 1999 MITSUBISHI ECLIPSE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
I notice that the rpm needle dances at idle. Another thing that I noticed is that when I get on a highway it takes a long time to get speed. There are no codes coming up. These are some of the things I have done recently.

spark plugs
wires
pcv
vacuum hoses
fuel injectors
fuel filter
valve and exhaust gaskets
oil change
throttle position sensor
cleaned throttle body
changed air filter
Thursday, March 26th, 2015 AT 11:10 AM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The dancing may be the throttle plate and iac may need cleaning with choke cleaner also check your fuel pressure with a gauge auto parts rent it
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Thursday, March 26th, 2015 AT 12:15 PM
Tiny
KRYPTECLIPSE
  • MEMBER
  • 45 POSTS
IAC is new. The throttle body is completely clean. Where would the plate be, I have checked everything and everything seems tight and in the right place

Thanks in advance
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Thursday, March 26th, 2015 AT 12:31 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Throttle plate is where iac is and if it's clean then that isn't the problem. Check fuel pressure with a gauge like I said in first reply then check for a vacuum leak with choke cleaner
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Thursday, March 26th, 2015 AT 12:48 PM
Tiny
KRYPTECLIPSE
  • MEMBER
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Fuel pressure is right for the car. I have replaced all vacuum hoses and there are no leaks.
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Thursday, March 26th, 2015 AT 1:15 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check vacuum at intake if 15" or below suspect clogged converter/exhaust. Other than that I can't think of anything else.
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Thursday, March 26th, 2015 AT 1:18 PM
Tiny
KRYPTECLIPSE
  • MEMBER
  • 45 POSTS
Will do Thanks for your help
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Thursday, March 26th, 2015 AT 1:33 PM

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