Den1707 Posted August 31, 2021 Share Posted August 31, 2021 My renix 2.5 tbi. (Wrangler) needs 0.5% co it has around 0.6 % after warming up for a few minutes. Then when running stationary and standing still, after 6 or 7 minutes it rises to 6%in a few seconds 🤯. I know i have a bad egr.. but could that be the problem? Checked CTS , MAT replaced: MAP. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted September 1, 2021 Administrators Share Posted September 1, 2021 Den1707...The purpose of the EGR is primarily to reduce NOx, not CO or HC. If the EGR is stuck open at an idle, however, that could impact your CO readings. The O2 sensor and fuel trim can be read if you have a scanner. Other possibilities: a clogged exhaust (cat or muffler) or a dead cat. If you have a simple infrared non-contact thermometer, read the catalytic converter from front to rear. (A Flir thermal image works even better here.) See if there are cold areas, indicating a clogged catalytic converter. Check the muffler for clogging. Let us know if this turns up something specific. Higher CO can also be the result of tune issues, spark timing irregularities or the fuel pressure at the TBI regulator. Moses Quote Link to comment Share on other sites More sharing options...
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