1997–1999 Acura 3.0CL EGR Port Clogging 20131309

1997–1999 Acura 3.0CL EGR Port Clogging
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In some areas of the u.S., certain basic chemical properties of gasoline (regardless of brand) may cause the intake manifold egr port to clog or the egr valve to fail. If this happens, the mil comes on with a dtc p0401 (insufficient egr flow) or p1491 (insufficient egr lift) stored. Repair procedure 1. Remove the throttle body cover, intake manifold covers, ignition wire holder, and ignition wire cover. Throttle body cover ignition wire cover intake manifold covers 2. Disconnect the brake booster vacuum hose and the vacuum hose from the intake manifold. 3. Remove the throttle body from the intake manifold (two nuts and two bolts). Leave all hoses, cables, and electrical connectors connected to the throttle body.
Discard the throttle body gasket(s). Intake manifold manifold gasket (save.) pcv valve gasket (discard.) (discard – (’97 models ’97 models only) only) spacer 4. Remove the pcv valve from the cylinder head cover. Remove the intake manifold (three nuts and six bolts). 5. Remove the intake manifold chamber, iat sensor, boost plate, and pcv hose from the intake manifold. Intake manifold cover brackets intake manifold chamber gaskets (retain.) underside of intake manifold gaskets (retain.) brace boost plate gasket (retain.) o-ring (retain.) iat sensor pcv hose 6. Cover the six ports on the bottom of the manifold with duct tape. 8 mm drill bit duct tape egr port 7. Use an 8-mm drill bit and carburetor cleaner to clean the egr port in the intake manifold. Turn the drill bit only by hand. Do not use a power drill. 8. Put the special drill bit from the egr pipe installation kit in your power drill. Coat the drill bit completely with clean engine oil. Note: the oil coating is critical to drilling the hole accurately, and it contributes to drill bit life.