Rich Idle and high oil pressure

Discussion in '96-04 - 2V Specific' started by 97stanger, Jan 17, 2016.

  1. 97stanger

    97stanger Legend

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    Randomly I started the car up after replacing the alternator and my wideband is showing that my car is idling extremely rich, in the range of 10.5-11.0. It normally idles around 14.5-14.7 if I remember correctly. I really haven't had the time to drive the car much the past 6 months or so, but has anybody ran into a rich idle and can give advise on quick things to look for? I just want to try a few things if they are quick and easy before getting the car on a dyno and see whats going on. Also, I run a cobra HO factory oil pump. Does anybody know what cold idle should be around? Today it was idling around 75-80, which sounds high to me but I don't remember if this is normal or not. Thanks in advance
     
  2. 96blak54

    96blak54 Legend

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    Oil is normal cold start up. Thin oil = high pressure is good.

    I would think a 6month start up would run a little different, but dang 10.5? Did it change once warmed up?
     
  3. 97stanger

    97stanger Legend

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    ok, I didn't remember if oil pressure that high was normal or not even when cold.

    and yeah, sat right in the 10.5-10.8 range for 2 minutes. Snowing today so I didn't take it for a cruise to see how it reacts to some rpm, but wasn't sure if anything quick I could check that might be common for such a rich idle. Just want to make sure this car is set up properly before I start hitting it with some nitrous
     
  4. Wichers123

    Wichers123 Well-Known Member

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    Calibrate your wideband unless aem they don't need calibration
     
  5. 97stanger

    97stanger Legend

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    It is an AEM
     
  6. Wichers123

    Wichers123 Well-Known Member

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    Do you have a battery switch that you turn off when the car sits and what's the temps out. Memory loss and low temps will change the afr's
     
  7. 97stanger

    97stanger Legend

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    Well speaking of the battery, I did just get a brand new one because my other red top was stone dead, so I had the positive/negative cables off for a while. Shouldn't once the car idles a bit the ECU relearn the AFR's how it was tuned though? Here in NJ it was in the low 30's when the car was started, I haven't started it since. There is a race shop literally 5 miles down the street from me so to be safe I was planning on just bringing it there to strap it on the dyno and get a real idea of whats going on.
     
  8. Wichers123

    Wichers123 Well-Known Member

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    Ford ecu is slow to relearn sometimes can take a few drive cycles. To get right. Also 30 is pretty low for a stone cold no memory vehicle. Everytime I do a re flash to update/correct the tune in my car I start let idle for 5mins then I shut down and restart and they pretty much starts the drive cycle.
     
  9. 96blak54

    96blak54 Legend

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    This ^ is good to know
     
  10. 97stanger

    97stanger Legend

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    Thanks for the info, I'll give it a few restarts and let it idle a good 5-10 mins and see if it starts to relearn anything. Thanks again for the advice.
     
  11. Wichers123

    Wichers123 Well-Known Member

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    Anytime man. Nothing to help out. It's all worth a try.
     
  12. 97stanger

    97stanger Legend

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    had some warmer weather today. Let the car idle a good 15 mins and put it in different gears. Like you said, it seemed to correct itself over some time and finally got to that 14.5-15 a/f ratio range once it relearned everything. One other question...I have an Autometer Vacuum/Boost gauge. What would be an expected vacuum reading @ idle without any load on the engine?
     
  13. vermilion

    vermilion Legend

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    Usually 14ish but different cam specs. on Decel it's 20

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