When I start the car it idles hard and then goes.

Tiny
ARICHARDS1960
  • MEMBER
  • 1992 NISSAN SENTRA
  • 136,500 MILES
When I start the car it idles hard and then goes normal, it does this several times and then idles normal but when I start to drive it seems like it isn't getting gas, it's hard to discribe, then it drives normal. My gas milage has also become very poor. I get 50 to 100 less miles to each tank. I recently had new tires put on a tuneup, new fuel filter and all new fuel injectors. Could it be the oxygen sensors or a leaky air control valve. I don't want to go to my machanic without some knowledge of the problem. Being a woman, it is easy to be taken advantage of. I really need it fixed as my expense for gas has been greatly increased in the past month. This car has run perfect for me for 20+ years (I bought it brand new off the lot in 92) and now it performs poorly for the first time ever. Andi Richards
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Thursday, November 29th, 2012 AT 12:17 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is the Malfunction Indicator Light (MIL) showing?
I am not sure of the problem as I can't understand the actual symptoms based on your desrcription. If the idling is low when started, the problem should be with the idle control and it can be a dirty throttle body, IAC or Air FLow sensor. Have them cleaned and retest if the MIL is not indicating.
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Thursday, November 29th, 2012 AT 1:33 PM

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