1994 Mercury Cougar RPM run high then go back to normal whi

Tiny
CLOAKVILLE
  • MEMBER
  • 1994 MERCURY COUGAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Only happens at high speeds or on the freeway. The car drives normal then all sudden the rpm get high around number 4 or higher then go back to normal withing seconds. I was told mayble the trasmission is goin out but we don't drive it alot. Now we drive it less. I keep it maintained but dont drive it as much.
Friday, August 13th, 2010 AT 5:17 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi cloakville, welcome to 2carpros and TY for the donation

Could be the transmission is slipping, if not could be one of these fuel pressure problem, throttle position sensor and MAF sensor-Try cleaning the MAF sensor with an electronic cleaner and see what happens for a start-
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Friday, August 13th, 2010 AT 7:13 PM
Tiny
CLOAKVILLE
  • MEMBER
  • 2 POSTS
I did clean the MAF sensor but it is still doin the same thing. I will try the throttle n see what happens. If it is slipping is it costly to repair? What has to be done to it so it wont slip?
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Sunday, August 15th, 2010 AT 4:02 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Cost of repairs varies with location and then again it depends what need to be fix within. If its slipping for sure, get it pressure tested this will indicate what's going on.
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Sunday, August 15th, 2010 AT 5:18 PM

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