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| Car running rich!; Need help diagnosing why engine is running rich | |
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| Tweet Topic Started: Aug 20 2012, 10:46 PM (994 Views) | |
| 91xfi1.0 | Aug 20 2012, 10:46 PM Post #1 |
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Hi Everyone, My xfi is running good, but my wife's Toyota Echo is not. I am hoping someone can give me ideas. The car is a 2001 Echo, and it is running rich. It was running rich enough that friends behind me noticed. A sniff test at the exhaust confirms it is gas. This engine is an ULEV, so the exhaust is seriously clean when the emissions system is working. The check engine light is not on, so no trouble codes. So far, I have given the car a tune up, and cleaned the MAF sensor (it was very dirty!) but that didn't solve the problem. Using Toyota service manual specs, I tested the MAF sensor. It is within specs. I also tested the Oxygen sensors. Both appear to working fine. Any other ideas of what to look for? I just realized I have one more test to try with the MAF sensor. I can test that tmw. Does anyone have suggestions of where to look if the MAF sensor is ok? Hey, thanks! Brad Edited by 91xfi1.0, Aug 20 2012, 10:47 PM.
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| Memphis metro | Aug 20 2012, 11:40 PM Post #2 |
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Are you sure the check engine light is working and the bulb is not blown? Map sensor can cause running rich issues. How does it run? |
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| 91xfi1.0 | Aug 21 2012, 12:03 AM Post #3 |
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Thanks for your help. I went out and confirmed the check engine light is working. It is. The car is not putting out the power it normally puts out. |
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| crankcase | Aug 21 2012, 01:07 AM Post #4 |
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I second the MAP sensor idea. I've had a similar problem on my 94Metro, but not real sure about the Toyota. Problem must be unmonitored if the engine light is not on. Other ideas that come to mind are an oxygen sensor or cat. Check for any pending codes if you can. |
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| idmetro | Aug 21 2012, 11:39 AM Post #5 |
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My thoughts run to fuel pressure - could it be possible (as on the Metro) where the fuel return line gets kinked or obstructed causing the fuel pressure to raise significantly and dumping "extra" fuel through the injector(s)? Good Luck! |
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