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1998 Mitsubishi Eclipse RPMs rise fast before acceleration

Tiny
MYCUTECAR
  • MEMBER
  • 1998 MITSUBISHI ECLIPSE
  • 2.0L
  • 4 CYL
  • FWD
  • MANUAL
  • 164,000 MILES
On acceleration rpms rise fast, then go back down and then back up normally. It feels like the engine revs and goes nowhere for a second or two before accelerating. It feels like a slipping clutch but I think its not the clutch because every time I disconnect the battery the problem goes away for a day and then comes back the next day. It passed smog and no check engine light comes on. Starts up every time and does not stall.
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Wednesday, April 16th, 2014 AT 9:02 PM

10 Replies

Tiny
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  • MECHANIC
  • 75,992 POSTS
Check the volume airflow sensor and the throttle position sensor
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Wednesday, April 16th, 2014 AT 11:09 PM
Tiny
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  • 8 POSTS
After disconnecting the TPS and connecting it back on, there was a change in motor and then the check engine light came on. That probably means the TPS is working.
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Friday, April 18th, 2014 AT 4:30 PM
Tiny
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  • MECHANIC
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Try scanning the computer for code/s
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Friday, April 18th, 2014 AT 5:11 PM
Tiny
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  • MEMBER
  • 8 POSTS
I scanned for codes last weekend and there was no codes. Ive had this problem for the past 3 months. I scanned it right now again and it gave me P0123 wich is TPS. I think its there because I disconnected the TPS a couple hours ago but didnt reset the computer after.
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Friday, April 18th, 2014 AT 7:33 PM
Tiny
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Try clearing the code/ again if it comes back with the came thing-troubleshoot the TPS
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Saturday, April 19th, 2014 AT 1:18 AM
Tiny
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  • 8 POSTS
The TPS code hasnt come back.
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Monday, April 21st, 2014 AT 10:20 PM
Tiny
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So, what's going on now-
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Tuesday, April 22nd, 2014 AT 11:25 AM
Tiny
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  • 8 POSTS
Nothing has changed. It keeps on doing the same thing. After I disconnected the TPS to test it check engine light came up and threw a TPS code. I erased the code and drove it two days and it shows no codes now. It has to be something electrical because the problem goes away for a day if I disconnect the battery and then it comes back the next day. It sounds like the engine builds power but is not delivering power to the wheels like its supposed to.
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Tuesday, April 22nd, 2014 AT 6:46 PM
Tiny
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  • MECHANIC
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Did you check the airflow sensor? Could be your transmission is slipping
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Wednesday, April 23rd, 2014 AT 2:53 PM
Tiny
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  • 8 POSTS
I replaced the TPS and the hesitation is still there. I'm going see if the fuel pump strainer is clogged because today I heard like if the fuel pump was starving for fuel when I first started it up.
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Wednesday, May 14th, 2014 AT 6:43 PM

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