Repeat problem 401 code Changed EGR Valve and two EGR Vacuume Regulate\or Solenoid Valves. Checked Vacuum. Lite stayed out for about 50 miles this time. Thanks for all the help. Any more suggestions?Repeat problem 401 code Changed EGR Valve and two EGR Vacuume Regulate\or Solenoid Valves. Checked Vacuum. Lite stayed out for about 50 miles this time. Thanks for all the help. Any more suggestions?
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No Engine I know of has a 1,2,3,4, fitting I am sure you have the firing order connected wrong, plus your description point to the firing order as well. Cheers, Malcolm Campbell.
well I'm a mechanic and you just told me what's wrong....
now all you have to do to fix it is test all parts listed replace the one (s) that fail test....
Check all the connections to the MAF sensor, check the sensor for dirt and debris, clean the sensor with a spray cleaner like brake cleaner, check for vacuum leaks, Replace the MAF sensor.
Your 401 code relates to the EGR system, vacuum hose leaks are more common for code setting. Also check vacuum modulator as they are known to faile more often than egr valve. If all check out o.k. and there are no exhaust leaks, suspect e.c.m. (computer) problem.
You may just want to check your gas cap also and make sure there is not any air coming through or it will throw off the sensor. Just a quick cheap check. (You may need to change it)
The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.
The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.
Make sure you has a NEW EGR gasket before you start the job.
It's a 2-3 hours job.
If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).
you probably have blocked passages in the intake manifold. remove the egr and check the port for a clog. you can scrape most of the carbon out with a pick or screw driver and then use some spray carbon cleaner in there. also check the metal exhaust line to the egr
Replacing the EGR valve, its actuator, or your DPFE sensor could all be at fault. I would probably start with the valve itself since it's an EGR leak code. Your gas cap was a wasted repair. The gas cap would cause a P0441 or 445 evap code, but not an EGR code.
Have replaced it twice (Vacuum Solenoid)
Repeat problem 401 code Changed EGR Valve and two EGR Vacuume Regulate\or Solenoid Valves. Checked Vacuum. Lite stayed out for about 50 miles this time. Thanks for all the help. Any more suggestions?
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