Quote Originally Posted by zadam123 View Post
I have taken maby 3 like trips and then cleand out the egr passage with carb cleaner then drove 20 miles befor the light came on again.

how long or how many trips should i drive the car befor this light shuts off?
Short of having actual Isuzu testing equipment, all I can say is that referring back to those same four sentences I mentioned last time is all that can be done.

"The number of test samples required...may vary according to..."

"Normally, the PCM will only allow for one EGR flow test sample to be taken during an ignition cycle." (Does this "ignition cycle" mean the entire time between when the engine is started and when it's finally shut off for that first test run after getting the new part put in? Depends on a persons' interpretation of "ignition cycle".

"To aid in verifying a repair, the PCM allows twelve test samples during the first ignition cycle following a Tech 2 "Clear info" or a battery disconnect."
How often does it take to run these twelve test samples? 20 minutes perhaps? I don't know.

"Between nine and twelve samples should be sufficient for the PCM to determine adequate EGR flow and pass the EGR test."
Could it possibly have taken around 20 minutes to take the nine-twelve samples that resulted in your EGR code being generated again even after you replaced the EGR valve? I don't know. Maybe someone will chime in with more info on how often these test samples are taken as an ignition cycle is occurring.