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cataiytic converter-removed-engine runs -rich


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carman
New User

Oct 7, 2008, 10:56 AM

Post #1 of 6 (2890 views)
cataiytic converter-removed-engine runs -rich Sign In

i removed the converter at the exhaust manifold now engine runs rich fuel condition i adjusted fuel level did not help engine runs poor --black spark plugs-high fuel consumption--this is the 3rd time i have used carjunky for this problem--i can find your diagnoses--1991-mazda-b2200--200000mi new rebuilt engine TKS-AGAIN


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 7, 2008, 2:40 PM

Post #2 of 6 (2884 views)
Re: cataiytic converter-removed-engine runs -rich Sign In

Is this to suggest it wasn't running rich till converter was removed? Why did you remove it anyway and what's in its place?

T



dmac0923
Enthusiast

Oct 8, 2008, 11:35 AM

Post #3 of 6 (2874 views)
Re: cataiytic converter-removed-engine runs -rich Sign In

i find this a little odd.. because basically what a converter does is heat up and burn off any excess unburnt fuel in the exhaust. and the 02 sensor at the rear of the converter reads the oxygen levels in the exhaust and tells the computer wether the car is running to rich or too lean.

now if the converter was removed i would think the 02 sensor would be detecting an extremely rich exhaust flow and tell the computer to lean out the air/fuel mixture thus giving you a constant lean condition.

inorder to help that situation they sell anti-foulers (pretty much a just a Spacer) for the 02 sensor. What they do is remove the tip of the sensor up out of the direct exhaust flow and up into the spacer thus in basic terms giving the sensor a false reading.
__________________________________________________
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2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


(This post was edited by dmac0923 on Oct 8, 2008, 11:39 AM)


way2old
Veteran / Moderator
way2old profile image

Oct 8, 2008, 3:20 PM

Post #4 of 6 (2868 views)
Re: cataiytic converter-removed-engine runs -rich Sign In

Being a 1991 Mazda pickup, I think there was only one O2 sensor.



Being way2old is why I need help from younger minds


HYdrogen_on_Demand
User

Oct 9, 2008, 4:13 PM

Post #5 of 6 (2861 views)
Re: cataiytic converter-removed-engine runs -rich Sign In

If you also removed the O2 sensor with the cat...well then your ECU isn't getting any signal and is dumping gas wholesale into your carb !!
If you don't want the cat but still want to lean out the gas and save in fuel and polution reduction go to
link removed by mod. not relevent to question
for more info on how to do that. There you will find out how to reduce your emmissions, clean up those soft carbon deposits, and save dramatically on your gas bill too.

Good Luck Smile


(This post was edited by way2old on Oct 9, 2008, 4:17 PM)


Guest
Anonymous Poster
pete.bruce@bigpond.com

Oct 19, 2008, 7:24 PM

Post #6 of 6 (2836 views)
Re: cataiytic converter-removed-engine runs -rich Sign In

Make sure your engine isn't running to cold. you may warp the head






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