Rich2279
CEG'er
What is the "Suck Test" procedure for clogged ports? I am getting the P0401 code.
-
Welcome to the Contour Enthusiasts Group, the best resource for the Ford Contour and Mercury Mystique.
You can register to join the community.
"Suck Test"
- Thread starter Rich2279
- Start date
EGR sucktest vacuumtest.
(remove the green vacuum hose from the top, be careful as it is brittle, and apply a vacuum (attached a small hose and suck on itl) to see if the car stumbles while running. This indicates a properly operating EGR.
Does it work properly?
NO: The EGR valve is defective or the EGR passages are clogged. Check (and clean, if needed) the passages behind the Throttle Body. Purchase a TB gasket, and remove the air plenum (rubber accordion tube) then remove the TB. Clean the EGR passage (small cut-out in the outer edge of the TB's mating surface) really well, install a new gasket and re-attach the TB. If the passages are clear, the EGR valve is defective. While rare, they do fail.
YES: The EGR valve works and the passages are clear. The likely fault is the DPFE sensor or its sample hoses, followed by the EVR solenoid or the PCM. May also be caused by interconnecting vacuum lines or electrical connections.
(remove the green vacuum hose from the top, be careful as it is brittle, and apply a vacuum (attached a small hose and suck on itl) to see if the car stumbles while running. This indicates a properly operating EGR.
Does it work properly?
NO: The EGR valve is defective or the EGR passages are clogged. Check (and clean, if needed) the passages behind the Throttle Body. Purchase a TB gasket, and remove the air plenum (rubber accordion tube) then remove the TB. Clean the EGR passage (small cut-out in the outer edge of the TB's mating surface) really well, install a new gasket and re-attach the TB. If the passages are clear, the EGR valve is defective. While rare, they do fail.
YES: The EGR valve works and the passages are clear. The likely fault is the DPFE sensor or its sample hoses, followed by the EVR solenoid or the PCM. May also be caused by interconnecting vacuum lines or electrical connections.
P0401 means you need to remove the TB and clean the egr passages
Rich2279
CEG'er
I had to do the "Suck Test" since I dropped my vacuum pump and broke it. Anyway, the engine did stumble when I sucked on the hose. If a new DPFE sensor fixes the problem I figure with 100k miles I should unclog the EGR ports, regardless.
TourDeForce
Hard-core CEG'er
Yes, do this FIRST! Don't spend money on the DPFE if you don't have to. That's enough for a case of beer.
