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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
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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
  • 45 POSTS
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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