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2000 Prelude check engine light on. P0401 EGR ...

Sent to Honda Experts March 10 10:30 p.m.

2000 Prelude check engine light on. P0401 EGR insuficent flow. Replaced EGR valve and gasket. Cleared fault. As soon as readiness status comes on for EGR so does check engine light and fault is back. What am I missing?

Optional Information:
2000 Honda Prelude H22A4

Already Tried:
Voltage test at EGR connector. Voltage test at vacuum solenoid. 5v signal,o.k. Checked vacuum lines and cleared with air. Cleared exhaust passages of carbon. Checked and varified vacuum to EGR and from intake throttle housing.

Customer (name blocked for privacy)

Status: Closed Value: $9

Answer
March 10 10:51 p.m. (21 minutes and 43 seconds later)

ACCEPTED

Hi,
Your problem is caused by carbon build up in the EGR ports causing a restriction(loss of flow). This can be prevented by having fuel injection carbon clean services perfromed every 30,000 miles, I like the BG chemical services. To repair your situation you will need to manually clean each port and clear the restrictions for proper flow. There is a Honda bulletin on this. Honda sells a port plug kit which will be required as you must remove the old plugs to access the ports. The part # is P/N 171 99-PT3-AHM, H/C 6078596
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