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Old 02-28-2008, 05:58 PM   #1
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I have a VX

Hi hi have a 1994 vx with a little problem i pulled the spark plugs today and found that cylinder 4 spark plug looked like it was running very lean but i figured it was because of lean burn and such then i pulled the rest of the plugs they were all showing signs of runnining rich any ideas on what could be causing this problem?

i thought it might be injectors but it would be weird since 3 cylinders have that problem

could oxygen sensor be causing this problem

Please any ideas or suggestions will help me it doesnt seem like i am getting the mpgs i should be gettin

thanks
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Old 02-28-2008, 06:21 PM   #2
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Stuck/clogged injector on #4 maybe
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Old 02-28-2008, 08:02 PM   #3
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If you have a fuel problem that is only with one cylender why wouldn't it be that one injector? an easy way to tell is to swap injectors and see if the problem moves.
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Old 02-29-2008, 08:50 AM   #4
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But then why would the others be showing sighns of burning rich
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Old 02-29-2008, 08:55 AM   #5
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Because the O2 sensor sniffs the oxides from the lean cylinder and ECU richens the mixture. Also they'll look rich anyway in winter driving with a lot of sub 30 minute trips.
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Old 02-29-2008, 05:31 PM   #6
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Was the plug melted/worn down?

Or was it just discolored?

Does your car smoke at all or take any oil?

I suspect it could be a clogged injector.
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