Question about 1996 Toyota Tercel

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I suspect ,my egr valve doesn't work or is clogged can you, tell me how to test it before taking any action to clean or replace it?

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If it doesn't work, the computer should give you a code about the egr valve. that's the basic test. there is also a vacuum strength required, you can use a vacuum pump to test this - but i don't have one. (a haynes manual can tell you how, step by step.)
if it's clogged, that's pretty simple to fix, you might as well try. you take the egr valve off, soak it in carb cleaner. then try opening and closing the valve, see if there's a little chunk of carbon stuck inside. the carb cleaner should loosen it enough to fall out.

Posted on Sep 04, 2008

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Wiring diagrm for egr valve 2009 jeep wrangler 3.8


JK jeep, i have 08 and full docs.
it wires to the PCM, same wire colors
as you can see drawing dont work right in fixya.
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the EGR is PWM modulated,
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p0405 means the pin on sensor part is stuck low.
tell me in most cases, the valve is stuck closed.
clean it is best first action.



26404471-dlj153dynqe1qkaeryvrbplc-3-0.jpg

26404471-dlj153dynqe1qkaeryvrbplc-3-1.jpg
the monitor pin is at X, this tells the PCM where the EGR moved
per PCM command. (called feedback) yours is hard stuck.
26404471-dlj153dynqe1qkaeryvrbplc-3-3.jpg

Dec 18, 2016 | 2009 Jeep Wrangler

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Engine runs rough wont idle in drive


1. replaced the air filter
2. replaced the PCV valve
3. inspected the PCV hose and connectors (nothing wrong)
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5. tested the EGR valve by pulling the vacuum hose off the top, and blocking the hose. The idle didn't smooth out. I applied a vacuum to the EGR valve manually and the car immediately stalled which tells me that the EGR valve itself is working fine.

Jul 05, 2014 | Ford Focus Cars & Trucks

1 Answer

What causes p0400 obd code


that is easy, EGR is failing.

what can causes, this can fill a book.
im not typing a book.

but the 2.5L (i own one and the FSM book)
covers this. H25A engine.
the 2.5l V6 the EGR is in the back top of engine where people cant go easy...
but needs to be removed and cleaned, its an electric motor driven
EGR main valve , i do the MACRo failure list.

1: bad EGR main valve. (or just dirty, we clean them..)
2: exhaust path to it or away from it are clogged.
3: there is some huge problem with air fuel ratios, or vacuum leaks
making the test lie,, the EGR test on all cars can lie.
because the test uses vacuum or engine air flow to tell if the EGR works. got other DTC errors, not posted??????

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1 Answer

I have a po401 code on my 96 Ford explorer


Your egr port is probably block..Apply vacuum to your EGR valve,while the vehicle is running..The vacuum should hold and the vehicle should run very rough or even go dead..If the valve doesnt hold vacuum,,then replace the valve..If the valve holds vacuum,but there is no difference or very little difference,,the EGR port is clogged in your intake..If all works fine ,,then suspect the DPFE sensor..This tells the computer if your receiving any flow..from the EGR

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1 Answer

I repaced my catalytic converter on my car. It was clogged, and drove it longer than I should have. It has been replaced, but my car still will not pull up hills and idles rough at low RPMS. We have...


Hi, not sure what car or engine you have but I would agree with both. If the IAC is popping, it probably isn't working right or the passage is clogged. If your exhaust was clogged, the EGR may also be clogged ot the valve possibly broken. Take it off and check to see if it closes properly. Remove the IAC valve and clean out the air passages. Put it all back together and see how it does. If these actions don't solve the issues, please get back to me with model, year, and engine.

Feb 10, 2011 | Oldsmobile Aurora Cars & Trucks

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Ford Taurus. Check Engine Light Code P1400


P1400 Exhaust Gas Recirculation valve position sensor
P1401 Exhaust Gas Recirculation valve position sensor
P1402 Exhaust Gas Recirculation metering orifice restricted
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P1406 Exhaust Gas Recirculation Differential Pressure Feedback Sensor downstream hose off or plugged
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P1408 EGR solenoid -Flow out of Self- Test Range
P1409 EGR Vacuum Regulator solenoid circuit malfunction
---
The sensor for the EGR Valve position is not functioning correctly.

Oct 16, 2010 | 2002 Ford Taurus

1 Answer

Random missfire all cylinders 1996 honda civic sohc


Check the EGR valve system. Honda's are prone to the exhaust supply to the EGR valve getting clogged with carbon at the valve port entrance. A clogged EGR valve can cause the engine combustion temperature to climb and then for pre-ignition miss-fire events to become common. The EGR is located inside the elbow of the air filter pipe at the back of the engine on the left beneath the coil. Anything you can temporarily remove to provide access the better. The EGR valve has two bolts, an electrical connector and a vacuum line attached to its top. Take it off and give it a really good clean, carburettor or brake cleaner works well in conjunction with cloths and brushes. Once cleaned like new replace everything including the vacuum line and electrical connector.

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4 Answers

About a month or so ago my engine light came on showing an egr code. I didnt worry too much about it and then one day last week it started idling rough and badly sputtering going down the road. I am...


The most common problem is a clogged EGR valve. In any case, you should take it to a mechanic who has the tools to diagnose it further, because 1/2 a dozen things can cause rough idle in a 10 year-old Windstar.

Nov 26, 2009 | 1999 Ford Windstar

1 Answer

EGR Valve Cleaning on a 1999 4.3 Silverado


If it is not just badly clogged, the intake does not need to be cleaned out. If you want to clean it out then take some brake cleaner and spray it in there and wipe it with a rag. I have never seen someone have to clean the intake due to not being clogged. Just my expierence I would just change the EGR and go from there

May 21, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

Insufficient EGR Flow problem


Specifically DTC P0401 is "Exhaust Gas Recirculation (EGR) Insufficient Flow". Now this is where we have to be careful when we read a code. In this case it is not saying the EGR valve is bad, it's saying the EGR flow is too low. Now it could be because the EGR valve is bad. Or it could be a clogged EGR tube or a broken vacuum line. This is why you have to be careful and check the whole system before you go changing parts. The PCM tests the EGR system during deceleration by momentarily commanding the EGR valve to open while monitoring the Manifold Absolute Pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in MAP. If the expected increase in MAP is not seen, the PCM notes the amount of error that was detected and adjusts an internal fail counter towards a fail threshold level. When the fail counter exceeds the fail threshold level, the PCM will set DTC P0401. The number of test samples required to accomplish this may vary according to the amount of detected flow error. Normally, the PCM will only allow one EGR flow test sample to be taken during an ignition cycle. To aid in verifying a repair, the PCM allows twelve test samples during the first ignition cycle following a scan tool Clear Info or a battery disconnect. Between nine and twelve samples should be sufficient for the PCM to determine adequate EGR flow and pass the EGR test. To check the system first you need to remove the EGR valve and if it is clogged or broken. If it is, clean or replace it. If it is okay, then remove the EGR inlet tube from the exhaust manifold and the EGR outlet tube from the intake manifold. If either or both are clogged, clean them out or replace them. Then check the ports in the manifolds themselves to see if they are clogged. If so, clean them out. When you are done, disconnect the battery for about 30 seconds to clear the code and drive the car to see if the light comes back. This should take care of the problem. If not, then you will need to put a scan tool on the car and see what the EGR control system is doing wrong and correct it.
The Valve on this car is electronic, so, unfortunately a vacuum pump will not work for testing.
If you have a scan tool, you can command the pcm to open the valve to see if the valve itself is working.There are really only4 things to go wrong with these things, PCM, wiring,the valve itself, or plugged passages. I have never seen the pcm cause this problem, or the wiring for that matter. If you say you have pulled the EGR and checked the intake passages, then I would be pretty confident in saying the the egr valve itself is bad.
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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