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2002 Misfire All Cylinders | Have read other posts | Advice?

3819 Views 12 Replies 8 Participants Last post by  Whoelse
PO301 through PO306 codes. Triggering CEL + VTM-4 lights. Car has 175k miles.

Work performed after reading through this great forum:

-Valve adjustment performed by local mechanic in Portland, OR
-Coils replaced with ones from a 50k mile motor by local mechanic
-New plugs
-EGR port cleaned
-New EGR valve
-New air filter
-Fresh oil change
-Lucas injector cleaner added to full tank of gas
-Premium gas always used


-CEL + VTM-4 lights still coming back on after clearing codes


-Should I take to Acura dealer have them perform valve adjustment again? What else am I missing here or should I try? This seems to be a common problem…
-Is there a way to ‘disconnect’ the connection between the CEL and VTM-4? In other words, it’s a big bummer to needlessly lose AWD in winter months when the car seemingly runs fine and the CEL goes on. Thoughts?

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Low fuel pressure might cause missing w/o setting codes. There should be some change in the Long Term Fuel Trim's (Increased positive LTFT) indicating low fuel delivery. Measure fuel pressure at idle and under load to check.

good luck
Unusual for EGR fix to resolve a problem w/o P0401, P0403, P0404, P0406 code. Did you ever have an EGR code?

good luck
1 - 2 of 13 Posts