95.5 Isuzu Rodeo running rich

11-10-2010, 02:34 PM
I have a 1995.5 Rodeo with 3.2L and 160k miles. It runs rich. Black smoke from exhaust. No codes. Air to fuel ratio is 2:1. Timing is good. What should I do to fix this?

Cat Fuzz
11-10-2010, 07:57 PM
Where are you getting your air/fuel ratio? Ideally, air/fuel ratio is 14.7:1.

You could have any of a number of things wrong. Leaky injectors, bad fuel pressure regulator, coolant temp sensor, plugged up air filter.....that's off the top of my head.

11-11-2010, 10:02 AM
I have a snap-on mt-2500 brick. One of the pids displayed is the air to fuel ratio. I have already replaced all the injectors, fuel pressure regulator and air filter. I did not replace the coolant temp sensor because I was getting readings on both the dash gauge and the snap-on scan tool. Any other ideas would be greatly appreciated. Thanks.

95.5 Rodeo
11-12-2010, 12:30 PM
When I had this problem, it turned out to be the oxygen sensor.


Good Luck,

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