Plug reading

[Programmer]

Does Alex's scan tool allow for fuel trim relearn ? If so, do a fuel
trim reset, and go for some more WOT runs after a 15-20 mile drive.
Recheck the O2 at WOT. If fuel trim returns to anything higher than -10%,
it's removing fuel (kinda like lower BL numbers). FP could be high or MAF is
slewed lean. If the O2's don't switch between 200 and 800, but seem to stay
on the rich side (400-900), the O2's are possibly the problem.

Lyndon.
-----Original Message-----
From: David Cooley <n5xmt at bellsouth.net>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: March 7, 2000 8:38 AM
Subject: Re: Plug reading


>At 10:32 AM 3/7/2000, you wrote:
>>Hmmm....Is the MAF contaminated ? It'll make this thing
>>run on the lean side. Any pinging ? Are you monitoring
>>with a scan tool during the runs ? Using the dual plats ??
>
>Cleaned the MAF about 2 hours before the run.  No pinging, Using Alex
>Pepers OBD-II scantool.
>O2 volts seems to stay between 880mV and 950mV at WOT.
>Using stock dual plat plugs, factory recommended gap.
>
>
>One other thing...
>Before the K&N, Exhaust, and air box mods, the Long term fuel trim at
>cruise would average -10%.  Now it averages -2%... Appears it's flowing
>more air so it has richened it up a little.  Also, Max airflow at ~4600 RPM
>is 25.025 pounds/minute or 189.35 g/s
>
>===========================================================
>David Cooley N5XMT Internet: N5XMT at bellsouth.net
>Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
>We are Borg... Prepare to be assimilated!
>===========================================================
>
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