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Fox Body Mustangs
Extremely rich and rough idle
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<blockquote data-quote="Mustang5L5" data-source="post: 16484430" data-attributes="member: 38517"><p>Code 42/92 are worth looking into, but keep in mind they could be a result of how the car is running and unable to control the fuel trim. </p><p></p><p>42/92 are system rich. Run the codes one more time and run a cylinder balance test. Run it 3 times and verify you get a 90 each time to eliminate a misfire as the source of running rich. </p><p></p><p>Next, you can test the O2 sensors. </p><p></p><p><strong>87-90 5.0 Mustangs:</strong></p><p>Computer pin 43 Dark blue/Lt green – LH O2 sensor</p><p>Computer pin 29 Dark Green/Pink – RH O2 sensor</p><p>The computer pins are 29 (LH O2 with a dark green/pink wire) and 43 (RH O2 with a dark blue/pink wire). Use the ground next to the computer to ground the voltmeter. The O2 sensor voltage should switch between .2-.9 volt at idle.</p></blockquote><p></p>
[QUOTE="Mustang5L5, post: 16484430, member: 38517"] Code 42/92 are worth looking into, but keep in mind they could be a result of how the car is running and unable to control the fuel trim. 42/92 are system rich. Run the codes one more time and run a cylinder balance test. Run it 3 times and verify you get a 90 each time to eliminate a misfire as the source of running rich. Next, you can test the O2 sensors. [b]87-90 5.0 Mustangs:[/b] Computer pin 43 Dark blue/Lt green – LH O2 sensor Computer pin 29 Dark Green/Pink – RH O2 sensor The computer pins are 29 (LH O2 with a dark green/pink wire) and 43 (RH O2 with a dark blue/pink wire). Use the ground next to the computer to ground the voltmeter. The O2 sensor voltage should switch between .2-.9 volt at idle. [/QUOTE]
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Extremely rich and rough idle
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