1998 4Runner sputtering

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Feb 6, 2013 | 03:47 PM

TangoDown

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1998 4Runner sputtering

I just had a tune up on my 98 4runner 3.4L 2wd and replaced a coil but it's still sputtering and misfiring. Any suggestions? Thanks

Feb 6, 2013 | 05:57 PM

stockwell45

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From: Sonora, CA

Quote:

Originally Posted by TangoDown

I just had a tune up on my 98 4runner 3.4L 2wd and replaced a coil but it's still sputtering and misfiring. Any suggestions? Thanks

Any CEL?

Feb 6, 2013 | 06:04 PM

TangoDown

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The CEL had been on for an O2 sensor but it hasn't had a CEL since the tune up yesterday. It is sputtering intermittently.

Feb 11, 2013 | 01:34 PM

mastacox

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From: Fort Worth, TX

Sounds like you'd better try replacing your o2 sensor, it could be your engine is running either too rich or too lean due to a sensor issue.

Mar 22, 2013 | 11:45 PM

griffin1ets

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Was it o2?

Jun 19, 2013 | 06:27 PM

fhalperformance

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I would start with the oxygen sensor. Are you using the oem type spark plugs? I have a similar issue on my build. It ran alot better after I put the right spark plugs in. Could be coil, spark plug type, spark plug wire make, injector, engine ground, head gasket issue.