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DIY PROM Do It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.

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Old 01-17-2008, 05:25 PM   #1
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Join Date: Apr 2004
Location: Calif
Posts: 515
Car: 75 Vette
Engine: 406 TPI
Transmission: 700 R-4

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new o2 sensor

what would cause my block learn to slowly go down
like from 128, ran that way for a long time for over
a year, then real slowly started to get richer down
to 118 this took about 4 weeks this is at a steady thottle,
tried a new o2 sensor
same problem

Last edited by 1tpi; 01-17-2008 at 05:29 PM.
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Old 01-17-2008, 09:34 PM   #2
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Car: check
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Re: new o2 sensor

Leaky injectors, fuel pressure increasing, FPR diaphram leaking, fuel has less ethanol in it, bad MAF, bad MAP sensor.

RBob.
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Old 01-17-2008, 09:34 PM
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