More updates crazy fuel trims maf cats etc.. I'm lost
#1
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1) New MAF reads about 7g/s at idle. Seem correct?
2) MAF reads 5.5 gs ignition on motor off
3) front o2s read .09 to .9 and the cycle all over in between.
4) just added back o2s to my ultragauge. Key on they read .445 each. Once motor warms up they are cycling between .8 and .1 this does not sound good but are the cats toast or just a major problem somewhere else?
2) MAF reads 5.5 gs ignition on motor off
3) front o2s read .09 to .9 and the cycle all over in between.
4) just added back o2s to my ultragauge. Key on they read .445 each. Once motor warms up they are cycling between .8 and .1 this does not sound good but are the cats toast or just a major problem somewhere else?
Last edited by Ben Matheson; 05-01-2019 at 06:22 PM.
#4
#5
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I swapped it because I'm to stupid to leave crap that isn't broken alone. I put the old maf back in got same reading of 5.5. Might just be a default value. This thing is clearly running very rich with no explanation. Cats appear to be toast but is that a cause or effect?
#6
#8
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#9
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OK, with those graphs it cannot be running rich. The 02's are cycling right at stoichometric, so it can't be rich. If it was rich they would be at 1 volt all the time. The downstream cats look like the upstreams are bad (not burning off the excess) and they are cycling in time with the ECU injector cycle.
#10
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OK, with those graphs it cannot be running rich. The 02's are cycling right at stoichometric, so it can't be rich. If it was rich they would be at 1 volt all the time. The downstream cats look like the upstreams are bad (not burning off the excess) and they are cycling in time with the ECU injector cycle.