GM EGR Valve Testing (P1404 Case Study)
Use this video to support Sections 3 (Transistor Drivers and Output
Solenoids), 7 (Potentiometers) and part of 20 (Idle Speed Controls) in my
eBook available at www.scannerdanner.com.
How to test a GM linear EGR valve. What is duty cycle and how does it
relate to valve position? What is the learned EGR valve closed position and
why is it needed?
P0401 EGR Valve Port Cleaning
This is my DIY for clearing the CEL code P0401 (EGR Insufficient Flow) on a
98 Honda Prelude.
In cars with OBD2 if the EGR valve is restricted by carbon deposits it will
detect that and throw a CEL. To get rid of that CEL you must clean out the
carbon to allow flow.
After combustion occurs within the engine it creates Exhaust. Gas from the Exhaust straight from the engine is very bad for
the air. The EGR valve recaptures that Exhaust and runs it through the combustion
process again, which lowers the temperature of the fumes (Exhaust gas) and lowers the amount of pollution
exiting into the atmosphere.
If you don't fix it you won't pass SMOG in California. You may experience
rough idling and poor acceleration.
Get your "EGR port plugs" from Honda. They will have it.
Removing the injectors are important to allow clearance to the port plugs.
When you pull out the injectors you might as well clean them since they are
Slide hammers make pulling the port plugs out easily.
Drill with a bit the size of your tap. Drilling halfway through the port
plug to should be enough distance to fully grab the port with the slide
If after you clean your ports and valve the CEL has not been cleared, you
EGR valve maybe faulty and needs to be replaced.
EGR valve cleaning WITHOUT DISMANTLING - Cleaner kit test Before/After
How to clean an EGR valve without dismantling with a Bardahl EGR valve
cleaner kit. Test of the effectiveness of the kit by visually checking the
valve before and after cleaning. Cleaning with removing/refitting of this
valve here: http://youtu.be/o6k99PvANew
Auto, automobile, car, vehicle maintenance tools parts accessories engine
mechanics do-it-yourself diy tutorial tuto
This video does not constitute or replace a real specialized technical
manual, and was only made for convenience and educational purposes.
"TutoBuild Eng" makes no warranties of any kind and accepts no liability.
"TutoBuild Eng" cannot be held responsible for any damage caused to devices
or persons using information contained in this video. The use of the
information contained in this video is at your own risk.
How To Clean The EGR Valve On A GMC Safari Vortec V6 Engine
Here is how to clean the EGR (Exhaust
gas recirculation) valve on a GMC Safari Vortec V6 engine. If your engine
started running really rough all of a sudden, your EGR valve may be stuck
open. It's easy to remove and clean up. It is a good idea to install an
EGR valve gasket with a filter in it to prevent future carbon buildup.
Here is a link to a video I made showing the gasket:
How to Seafoam your vehicle (Also called Top Engine Clean)
This is a carbon deposit cleaner that when used can help eliminate the
carbon deposits that build up in the top end of your engine block. I
perform this about every 15,000 miles on my own vehicle.
Steps to seafoaming:
1. Bring your vehicle up to normal operation temperature
2. Separate seafoam canister into 3 equal parts (one will be for sucking
through a pvc line or brakeBooster
line, one for gas tank, and one for putting in the oil filler cap)
3. Locate the PVC valve that runs through the intake manifold, for this is
where you will initially suck 1/3 of the seafoam canister through.
(If PVC is non accessible then you can use your brake Booster line in the same manner.)
4. Once engine is at normal operational temperature, have another person
sit in the drive seat and bring the engine RPM up to around 1500.
5. Pull your PVC off (or brake Booster line) and start slowly sucking 1/3 of
the seafoam in through either of these locations. Be cautious & steady
handed, you don't want to stall the engine out.
6. Once you've sucked all of the 1/3 portion up turn the engine off &
replace pvc or brake Booster to its
7. Once engine is off, unscrew your Oil Filler cap & pour 1/3 of the
seafoam in as if it were oil.
8. Unscrew gas cap and put the remaining 1/3 seafoam in.
9. Leave the car alone for 15 minutes.
10. Come back to the car and start it up, let it idle for about 10-15
seconds and then BRING ENGINE RPMS TO A STEADY 2000-3000RPM for no more
than a couple minutes.
(major revving or fluctuation can knock carbon deposits loose so please
keep a steady foot)
11. Once this is complete, take your car for a 10-15 mile drive, while
doing so make sure to bring the engine through its total rev band spectrum
to make sure all the carbon deposits have been cleaned out.
12. Once the drive is complete, bring the car back home.
13. CHANGE YOUR OIL & FILTER & SPARKPLUGS WITH KNOWN GOOD OEM SPEC PARTS.
(The reasoning behind this is that the seafoam lowers the viscosity of your
oil, thus weakening its ability to control wear on your engines major
mating surfaces and your plugs get buggered up with carbon after this
tuneup due to the carbon coming loose during the tuneup.. So an Oil/Filter
change & Spark Plugs are a must after seafoaming is complete
14. Tune Up is complete!
A 101 on the component of the car the reduces nox emissions, the egr
Valvoline EGR Cleaner
Valvoline EGR + turbo Cleaner is a blend
of selected solvents, carefully formulated to remove deposits on EGR valve
and turbo systems. It quickly removes
gum, varnish,carbon and dirt.
* Cleans EGR valves and turbo chargers
* Leaves no residue
* Restores engine performance
To buy in the UK:
For more information see:
Volkswagen TDI - Dieselgeek EGR delete install
This is a step-by-step instructional video showing how I installed a race
pipe and EGR cooler delete kit from Dieselgeek.com on my 2002 Volkswagen
Jetta TDI. Written instructions were not included in either kit. This mod
did trigger a Check Engine Light after about 12 miles of driving.
The race pipe and EGR cooler delete kit together ran me exactly $169.01
How to fix p0401 egr code on 3.1 v6
Don't go out and buy a new EGR valve for $100. Heres how to fix it
yourself. If you have the code P0401 EGR flow insufficient, just clean the
passage way. Using a wire coat hanger or piece of flexible yet strong wire
and throttle body cleaner you can clean this yourself. Afterwards make sure
to clean out your throttle body of all the crud deposits. This engine is in
my 98 Buick century, along with Chevy Malibu, Chevy Lumina, Grand Am, Grand
prix. Thanks for watching
Dumb Things NOT To Do To Your Car
Scotty Kilmer, mechanic for the last 47 years, shows some of the dumb
things he's seen people do to their cars. And, If you like my car help, be
sure to watch my live car talk show every Saturday morning at 10 AM CST on
YouTube. I answer your car questions LIVE there. Just check it out at
eature=c4-overview . And remember, every TUESDAY I upload a new video, so
don't miss them.
P0401 EGR Insufficient flow test
Here is how to test code P0401 and the DPFE sensor. Sure, the DPFE has a
high failure rate, but do we "throw" the part at it, or do we test it to be
sure it's actually failed. AND, this is a great way to confirm the
repair to prevent a "come back"