I have a 1998 4wd Taco Ex cab,with a 2.7 motor that has 420K miles on it. The CEL came on and the code was P0401 "insufficient EG flow to EGR system". I tried cleaning the EGR, roto-rooting the tube the connects the EGR to the exhaust manifold and cleaning the EGR solenoid. When none of that worked I even replaced the EGR for $130 bucks and I still get the CEL.
The truck is running fine. I don't want to disconnect the system as some have suggested in other threads. Any ideas?
Is it possible that the temp sensor is shot? Those things run about $120 so I'd really like to know if its the likely culprit based on my description of the problem.
Side bar: When I removed the new EGR during my roto-rooting effort I did notice that the inside of the new valve was getting some fouling for the week that I ran it. It wasn't as bad as the original but it certainly had a coating of fouling indicating exhaust gas flow.
thanks
The truck is running fine. I don't want to disconnect the system as some have suggested in other threads. Any ideas?
Is it possible that the temp sensor is shot? Those things run about $120 so I'd really like to know if its the likely culprit based on my description of the problem.
Side bar: When I removed the new EGR during my roto-rooting effort I did notice that the inside of the new valve was getting some fouling for the week that I ran it. It wasn't as bad as the original but it certainly had a coating of fouling indicating exhaust gas flow.
thanks