My a/f went out to lunch

[Vanin]

Okay. I just bought my car a week ago. It's a 97 spyder GST. It ran fine when i bought it and ill admit i have drivin it a little hard. My a/f sat around 14.5 and everything seemed fine and dandy up untill yesterday. My a/f went out to lunch and decided to jump between 12 and 15 and the car is reving higher while it idles now. any suggestions?

 

[mikelv]

Please update your profile with your modifications and I can better help you out.

Please explain the exact symptoms as well. Thanks.

 

[Vanin]

okay. well i went to a buddies house last night and the car was running just fine. and when i left it seemed fine till i stopped at my other buddy's house and it sounded like the car has a miss. the a/f was all outta whack and it just didnt sound right. i started it up this morning and it was revving high and my air fuel was still out to lunch and i really have no clue what's going on. the cars pushing 17 psi with an MHI 14b turbo. Sitting at an idle it used to rev around 780- 820 and now it's at 12 or 13. it scares me because i've only had the car for a week.

 

[delta448]

Let the engine cool down. Restart it and see if the idle really needs adjusting or if the Fast Idle Air Valve was just doing its job.

Do you have a wideband O2 sensor installed? You said that your A/F ratio was 12-15, you cannot count on the stock narrowband O2 sensor for an accurate reading.

 

[Vanin]

honestly i have no clue about the o2 sensor because everything was done to the car before i bought it. I'll ask the guy than reply thanks for the help though.

I let her cool down started it again and it's still doing the same thing. Also i noticed a funny noise coming from the passenger side of the car. it sounded like 2 clicks.

 

[delta448]

Do you have a CEL? Possible EGR solenoid malfunction?

 

[Vanin]

i was driving it last night and i also discovered that the car wont build boost in first gear and it's hard for it to build boost at all.

 

[snowborder714]

Have you touched anything on the car recently? Mine wouldn't build boost when I accidentally swapped two spark plug wires.

And what Zach was asking about the wideband can be determined by how you're seeing your A/F ratio in a number. Do you have a gauge that shows a number? If so, you have a wideband o2 sensor.

Does the clicking noise happen just at idle, just during turning, all the time? Any idea where specifically it is coming from?