That's Rich! - MustangForums.com


5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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Old 10-11-2017, 05:53 PM   #1
Rumblefrog
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Join Date: May 2005
Location: Oregon
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Default That's Rich!

For quite a few years, I have been running the following set-up: 5.0 block (stock from Ford Racing), AFR 185 heads, 1.7 roller-rockers, E303 Cam, 24 lb/hr injectors, 70mm throttle body, GT40 upper and lower intakes. This combination has always performed very well - good mileage, great power, very smooth. However, it has also always run very rich. My exhaust pipes are quite sooty, and I can smell a lot of gas in the exhaust. I have very carefully (and repeatedly) searched for any possible exhaust leaks and not found any. I also cannot locate any vacuum leaks.

My question: Is the stock, factory computer from an '89 GT able to deal with my mods and add-ons okay, or is some sort of "flashing" required?

Any other ideas as to why I might be running rich?
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Old 10-12-2017, 12:05 AM   #2
dawson1112
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Soot and smell is not an indication of rich. Unless you get a CEL indication a rich condition or you have an a/f meter monitoring the system you dont really know if its rich or not. If it were in fact very rich, you would most likely notice it in idle and or drivability.
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