I recently replace the EGR valve on my car and cleared the check engine codes. Then, took it out for a drive.

The good news is that I managed to get the car to pass inspection.

The bad news is that the check engine light came back on for the same issue after my inspection was done. It says EGR insufficient flow...what could be causing this to still be a problem even after replacing the EGR valve?

 

Take the egr tube and clean out all the built up carbon from the inside and see if that helps

 

its either the tube that feeds the EGR from the exhaust or the passage in the upper intake manifold that the egr sends exhaust to. one of these could be blocked... sounds like the old EGR might have been ok...

 

Delete it and delete the code!

 

all depends on which car it is on too.... and if he has a tuner. if it is a DD deleting it can hurt mpg. even with retuning! if your doing mods its prob worth removing...

 

That is true, I like the look of the engine without it but if its a stock engine it shouldn't matter. I have a few if you need one.

 

The 3100 (especially the '94-'95 models with the 3 solenoid EGRs) are none for quarky EGR issues. Most of the time, the EGR is not really bad.

Best first thing to do, pull the EGR off. Using carb clean generously and something thin/long/flexible (I use a piece of old speedometer cable), spray and force the speedo cable down the tube/tunnel that connects the EGR to the UIM. That is common for gunking up.

 

Gun cleaning kits have a nice rod n brush for cleaning it to. Your style egr couldve been taken apart n cleaned. after its cleaned if you throw a code check cat, it should b good since u passed the test .