low egr flow obd II code

[saul]

i´ll have a 1995 gran marquis and it give me code p0401 (i think so ) well code problem it´s low egr flow , the first time i change egr valve , egr solenoid and dpfe sensor , and the problem eliminated , no more check engine light ..........well but that was like 3 weeks before , now the light comes on and if retrieve codes it´s the same , i erase it and start the car and before finish first block , ligths come on on the same code ........i need help

[fordman123]

Might want to check the egr ports.
To do this you would need to remove the throttle body.
You might find a string of carbon built up on the ports.
Some carb cleaner and an air line to blow it out!!

Just a thought.

Good luck!!

Fordman123

[V-8Fan]

I too have a 95 GM that gives me the same problem. I have replaced the EGR Solenoid and the EGR Valve itself, but the problem persists. One interesting thing about this problem---I took the car to the mountains of Colorado for a short vacation last fall, and the idiot light extinguished. But the darned thing came back on about the time I got back to the Texas Panhandle. I'm thinking that either the gasoline blends were different enough to make a difference, or altitude was a factor (I buy into the altitude theory myself).

Fordman, are you sure these EGR ports accessible on a '95 with a 4.6 Liter by removing the Throttle Body? I'll give it a go one day when I have enough time to finish the job.

Saul, have you had any luck yet with this problem?

[V-8Fan]

Fordman is right on the money! I don't know who sent me the email, but I received a good explanation as to how to remove the Throttle Body and take care of the problem.

Saul, I'd bet a dollar to a donut that this will fix your problem too. It worked for me, and only took about an hour or so to finish the job---after psyching myself up for a few minutes to convince myself that I could work on this unfamiliar beast (it always seems to come down to conquering fear of the unknown)!

Fordman, or whoever it was who emailed me, THANK YOU!

[greers]

I am having the exact same problem with code P0401 on our 96 Mercury Sable (3.0 24 valve). Any advice or detailed procedures on this would be helpful. In addition to the code P0401, I also have P0156, something about a O2 circuit problem (bank 2 sensor). This car runs smooth as a silk normally, but wants to hesitate and stumble when you hit the gas real hard, especially going uphill. Could this be related to the possible clogged egr ports? Thanks for any help.

[MaxPowers_68]

Originally Posted by V-8Fan

Fordman is right on the money! I don't know who sent me the email, but I received a good explanation as to how to remove the Throttle Body and take care of the problem.
Fordman, or whoever it was who emailed me, THANK YOU!

Can you do me a fav and send me that email with the instructions or post something up i have the same problem on my 92 Grand Marquis, thanks.

[jaimegmunoz]

Hi Guys !! I just saw your comments and I would like to ask for your help. I need to clean the EGR PORTS. the shop told me that they are clogged. my car is 1995 Grand Marquis. Did some have a good explanation in how to remove the Throttle body??
I would like to save some money. my mercury dealer gave me a quote for $ 300.00 Dlls.

[T-Bird]

I have a 93 Grand Marque LS, with Check Engine light on after about 20 minutes of driving. I retrived the code, and it was 332 low EGR flow. DPFE, EVR, or EGR Valve.

How do you remove the Thottle Body to clean the EGR Valve?

Thanks,

T-Bird

[gregf69]

I have a 1996 Mercury Sable that is also giving a 401 code....Dealer is quoting $765.00. When I finished laughing I told him I would pick up the car without having the woke done. How do I get to the EGR ports on the DOHC v6 3.0 engine?

[gregf69]

Originally Posted by gregf69

I have a 1996 Mercury Sable that is also giving a 401 code....Dealer is quoting $765.00. When I finished laughing I told him I would pick up the car without having the woke done. How do I get to the EGR ports on the DOHC v6 3.0 engine?

After much looking I found a vacuum line to the PCV valve that had come loose. After reseting the computer the cade has not returned.

[sable problem]

i HAVE A P0401 TROUBLE CODE ON MY SABLE AND CANT SEEM TO GET RID OF IT, PEOPLE HAVE TOLD ME TO CLEAN THE VALVE AND IT SHOULD GET RID OF THE PROBLEM. HASN'T THOUGH.....A LITTLE HELP ANYONE TRYING TO CLEAN THE PORTS AND SEE ABOUT WHAT PARTS NEEDS TO BE REPLACED. I SEE SOMEONE HAS A DETAILED SET OF INSTRUCTIONS FLOATING AOUND ANYWAY I CAN GET A HANDLE ON THIS....ANY HELP WOULD BE APPRECIATED.

[dxrflyboy]

I just want to clear something up about cleaning the EGR ports on the pre-'96 4.6L engine. It isn't the throttle body that needs to come off, but the elbow between the throttle body and the intake manifold. Leave the TB attached to the elbow and remove the 4 bolts attaching the elbow to the manifold. Once the elbow and gasket are removed, you will see that exhaust gas flows into the intake stream through 3 small ports, which clog with carbon quite easily. A little carb cleaner, scraping, and compressed air will clean them right out. Install a new gasket, reattach the elbow, and the problem is eliminated.

The Sable is a different animal. It doesn't have the same clog-prone ports, although clogging is possible in any engine. To diagnose a faulty EGR valve or plugged system, apply vacuum to the EGR valve with the engine idling. The idle speed should drop and the engine should run rough. If there is no change, Check the EGR valve and make sure it is opening. If the valve checks out OK, check the ports to make sure they are clear. If the valve and ports are OK, the fault could be with the EGR solenoid, wiring, vacuum lines, or the DPFE (most common fault with the Duratec V6). Of greater concern to you is the O2 sensor circuit fault. Check the wires to make sure none of them is chafed or burned (from touching hot exhaust components). Use a scan tool to access the O2 sensor output with the engine running. It should fluctuate between 0 and 1 volt. A shop manual is a very valuable tool when diagnosing engine management components and may be necessary to pinpont the cause accurately and avoid unnecessary component replacement.

[Scorpion4Life2003]

i have a problem here and was hoping to get an answer i have my car to 2 mechanics and they are saying that my bank 2 sensor need replace and i was wonderng if someone can tell me where the bank 2 sensor is located because the dealer wont tell me but they put it on the machine to test it out and it keep coming up bank 2 sensor and my light is on and i wanna know when i take it to the emmission test will they tell me excatly what is wrong with it because i have put money in this car and it still coming on i need some help plz.

[jimmytroanoke]

Originally Posted by Scorpion4Life2003

i have a problem here and was hoping to get an answer i have my car to 2 mechanics and they are saying that my bank 2 sensor need replace and i was wonderng if someone can tell me where the bank 2 sensor is located because the dealer wont tell me but they put it on the machine to test it out and it keep coming up bank 2 sensor and my light is on and i wanna know when i take it to the emmission test will they tell me excatly what is wrong with it because i have put money in this car and it still coming on i need some help plz.

You might want to post what kind of car and engine. You may also want to post as a new topic instead of burying it in a thread about EGR. That said, bank 2 is the drivers side of the engine in a RWD application - at least that is what alldata says for my f150. depending on application - OBD1 or OBDII, you may also have an upstream and downstream O2 sensor on each side (bank) of engine. IF your Engine light is on you will not pass emissions even if your car is running perfectly clean. There are many reasons for an O2 code to be thrown, and not all of them are caused by the sensor itself. Assuming it is a Grand marquis 95 and up you are OBDII and have 4 O2 sensors. Usually the problem is upstream or the sensor closest to the exhaust manifold. Inspect the wiring to the sensor for chafing or burns. Ohm out the heater wire to ground - look for open circuit. After you replace you need to disconnect battery to clear code or have a shop clear it with a scan tool. You will have to drive the car for a few days to make sure all tests have run and passed before it will pass emissions.