my 05 montego premier surges and revs up on it's own, it also has the engine fail safe come twice today. it has only done this once/ the fail safe and i started it back up after i shut it off and it was fine. no check engine light the first time it did this, however it did agian today for the first time in a year since the last time. now the check engine light is on? please help the car only has 125000 miles on it and i just had it tuned up new wires and plugs two months ago, and new compressor for the a/c and expansion valve. two weeks ago.
Country: United StatesMake: MercuryModel: Montego Premier AWDYear: 2005Engine: 3.0 liter
Hi, I’m Chris. Welcome and thanks for asking your question!
Step one is to get the codes. To do this you need to have a scan tool hooked up under the driver side of the dash. Most parts stores do this for free. These codes will tell you what is wrong and where to begin diagnostics or what to replace. Odds are you are going to get TAC codes which indicate you need to replace the electronic throttle body. Let me know if you get the codes and or need help with the repair.
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chris thank you and i did a code for TAC code P2106, i also got a code for PO61B and it says internal control module calculation performance error. wheni spray the throttle body where is the mass air flow sensor so i don't spray that. and thanks for all the help.
Spraying the MAF sensor to clean it is not a bad thing as long as the battery cable is disconnected. The MAF sensor is in the air intake tube right next to the air filter.