Welcome Guest [Log In] [Register]
Posted ImageWelcome to the all new Geo Metro Forum. We hope you enjoy your visit.

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features:

Join our community!




Username:   Password:
Add Reply
Car running rich!; Need help diagnosing why engine is running rich
Topic Started: Aug 20 2012, 10:46 PM (994 Views)
91xfi1.0


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.
Offline Profile Quote Post Goto Top
 
Memphis metro


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?
Offline Profile Quote Post Goto Top
 
91xfi1.0


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.

Offline Profile Quote Post Goto Top
 
crankcase


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.
Offline Profile Quote Post Goto Top
 
idmetro
Member Avatar


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!
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Engine Tech & Diagnostics · Next Topic »
Add Reply