egr code
 

my truck keeps throwing code 332; insufficient egr flow detected. what can i do about this? my cel light comes on and off throughout the day. all the original emissions equipment are there. the truck seems to be running okay, sometimes it has a hard time starting when it sits for a while but i think thats a totally different issue.

Pull up a chair and do some reading in this thread.
Click here:https://www.ford-trucks.com/forums/1...st-module.html

It may be the "fix" you're searching for.

Bob

There is no way for your Powertrain Control Module (PCM) to measure EGR flow. Your truck uses an EGR valve position sensor (EVP). Code 332 indicates the PCM never saw the EGR open. Check the vacuum lines running to the EGR valve. The vacuum supply comes from the intake manifold. The EGR Valve Regulator (EVR) modulates the vacuum going to the EGR valve.

It is also advised to verify the EVP sensor output is correct as well.

I had this after I out on my headers (shorty) and just ignored the check engine light as I knew that is what the problem was. Eventually I re-wired the check engine light to turn on and off with the ABS light so I didn't have a visual fail on a smog test (for the smog test the light needs to come on to indicate it's working and then turn off to indicate no codes).

I recently got an EGR eliminator. I've heard that half of the people that use those will have a check engine light come on...I am not one of those.

Yes, but if the circuitry is bad (unstable) in the PCM ...............I know, don't even go there yet. }>
That's why I said,"It may be the "fix" you're searching for." ;)

Bob

A while back, I was getting EGR codes so I replaced the EGR, EVP, and EVR and was still getting code 332. Found out I had a bunch of cracked, leaking vacuum lines. Replaced all with rubber tubing and code has never come back since.

the truck idles well so ive never suspected a vacuum leak but ill go after them tomorrow. i have also been contemplating the egr restrictor mod.

Before we get all hopped up on a bad ECM, how about we doing basic diagnostics and trouble shooting. We don't have any weird bizarre running conditions - we have a single simple code.

The light going on and off means that sometimes the EGR valve is able to open, and other times it is not. One thing with the speed-density trucks like yours, is that small vacuum leaks are often unnoticeable and the computer will compensate.

There are three major components to the EGR system:
-EVR: The EGR valve regulator. It's a variable vacuum solenoid
-EGR Valve itself
-EGR Posistion Sensor

What you can (sort of) rule out so far is a control-side electrical issue, as you'd probably get an EVR code. What I'd start with is some basic vacuum checks. You can rest a hand held vacuum tester from AutoZone. It'll cost you $55, but you'll get all your money back as soon as you return the tool. It's part number 27010 or AZ1030

Hook the tester's hose up to the EGR valve and start the engine. Slowly start pumping up the vacuum. The engine should run worse and worse the more you vacuum you apply, and with maximum vacuum the engine should stall or hardly run at all. The valve should hold pressure, if the pressure leaks down quickly than the diaphragm in the valve is ruptured and the valve needs to be replaced. Alternatively you can just suck on the hose going to the EGR valve, but it will be more difficult to identify a ruptured diaphragm.

Next find the feed to the EVR solenoid, and trace it back to the engine. When you find the hose at the engine take it off and hook it to the pump. Apply full vacuum and watch the gauge for movement. If it starts to loose vacuum rapidly, than either the hose has a leak, or the EVR has failed.

If you have a multimeter, you can also test the EGR position sensor using that same tool.

The EGR restrictor mod is a cover up, band-aid fix, for what is most likely a vacuum leak.

Bob

There's the possibility also of a build-up of deposits within the EGR valve itself, which would keep the valve from opening/closing properly.

Not "closing properly" would cause a vacuum leak.....hence the EGR restrictor mod the OP mentioned.


Bob

That's funny. Subscribed since I have to test my EGR once I get my engine rebuilt.

Don't do it...this mod is a band-aid fix to mask another problem. Fix the root cause......:-X19

Amen brother, amen !!!!!! :-X22

Bob