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Old 04-05-2017, 02:31 PM   #1
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Running lean, how do I fix it?

after I installed my header the car ran fine.. Now it sounds and runs terrible. This is the code I pulled. Any advice?


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Old 04-05-2017, 02:31 PM   #2
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Old 04-05-2017, 05:35 PM   #3
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Will that tool do more than read codes?

If so, look at the data from the sensors to see if the 1st is reporting at anything near the others.

Lean IS the result from installing a header, the question is if that is all which is happening. By itself, header doesn't often make quite enough difference to set a code even though it can be out of range at certain points (like the preset WOT area).

Don't forget that a leak at the header can bias the O2 lean.
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Old 04-05-2017, 06:04 PM   #4
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Quote:
Originally Posted by sailor View Post
Will that tool do more than read codes?

If so, look at the data from the sensors to see if the 1st is reporting at anything near the others.

Lean IS the result from installing a header, the question is if that is all which is happening. By itself, header doesn't often make quite enough difference to set a code even though it can be out of range at certain points (like the preset WOT area).

Don't forget that a leak at the header can bias the O2 lean.


Little update, so yes it does read codes sailor. The problem has been fixed and I will have the tune set to turn the rear 02 off for a header.. It currently is not and I thought it was. Anyways I pulled my plugs and well this happened. I pulled the spark plug pieces out so I'm safeand replaced the plugs. The car runs great now. I will not be driving until the tune is reset hopefully this week weekend.. Any idea why this happened?


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Old 04-05-2017, 06:27 PM   #5
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IDK your Mods list, but too lean and/or pre-ignition can damage plugs.

I'm seeing bright white on the portion of plug tips I can see there.
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Old 04-05-2017, 06:46 PM   #6
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It went from running normal to absolute crap.. The plugs were very loose when I pulled them out. I'm just happy the car is fine now. Is there anything else I should look for?


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Old 04-05-2017, 07:05 PM   #7
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Loose is NOT good, that can allow the plugs to heat up tremendously and be a CAUSE of the issues.

They need the solid contact of being tight to conduct heat away from them. Just an oops of running them in & forgetting to tighten them is enough to be a cause for all that.

Could be the main issue right there.

(and of course the tune needs to be finalized for the new setup before running it hard)
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Old 04-05-2017, 09:08 PM   #8
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Who did your tune ?

Not only are you running lean in closed loop but also in open loop , I would NOT do any more WOT till you do some datalogging with your tuner

You do have a wide band air fuel gauge correct ?

Tom
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Old 04-05-2017, 11:21 PM   #9
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Sailor, I'll double check them again.. The last time I pulled the plugs and replaced them was over a year ago when I did my valve cover gasket. I will keep a close eye on them right now and especially the car itself. I'm only driving it to work and back currently. Took it to the store today and CEL went off and car run 100% I'd say however I will be fixing the tune so it stays 100%.

Tom I do not have a AFR gauge, the car is NA. I know you can run them on a NA car but I never got one. It's just a FSWERKS tune and I thought I had the rear 02 set to off for the header in the past but I realize now I did not have it turned off which I believe is a big factor in the issue. I'm just surprised from it running rich / lean whatever it may be that it caused this.. I was on my way home when it first happened and I had no choice but to drive the car. I thought it was running really rich and just drove it home like that, it wasn't the smartest move but I didn't have my code reader with me so I just took it easy. Replaced a exhaust gasket that was bad figured maybe a leak would be part of it. Guess not..


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Old 04-06-2017, 10:44 AM   #10
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Rear o2 has nothing to do with your MAJOR lean issue , Its WOT I am worried about the most

With your mods you need a wide band AF gauge and a custom tune or you will soon need an engine

Tom
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