EGR Effect On Emissions Driveability

• Too little EGR flow may cause detonation and IM240 emissions failure for excessive NOx. Because EGR tends to reduce the volatility of the air/fuel charge, loss of EGR typically causes detonation to occur. If EGR is commanded but doesn't flow (restricted passage in manifold, nonfunctional valve, etc.) severe detonation will occur.

• Too much EGR flow and/or excessive flow for driving conditions may cause stumble, flat spot, hesitation, and surging. Because EGR dilutes the air/fuel charge, too much EGR for a given engine demand can cause a misfire. It is not uncommon to see tip in hesitation, stumble and surging when too much EGR is metered.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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