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Old 12-29-2007, 07:09 PM   #1
MikE2
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Bad EGR valve symptoms question

I pulled codes and got a 332, which is EGR valve opening not detected. My question is, would that make the truck surge very badly at times, and so far only after its been driven for nearly 2 hours? When the truck is turned off and cools down it seems to run OK again.
When it starts doing it all the power is cut off for maybe 1/3 of a second, then the power comes back for maybe a full second then it cuts the power off again and does that continuesly untill it decides to quit doing it.
Also, when its doing it the tachometer is dropping off quickly to zero but it usually never gets down that far untill the power comes back on and brings the tach back up to what the actual RPM is. I'd say if the engine is at 2000 RPM's the tach will flicker between 1400 and 2000 when the engine is surging. Because the tach is moving like that it makes me think its an ignition problem and not something with the EGR? Or can the EGR have any control over the ignition?

Thanks for any help.

94 F150, 302, M5OD
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Old 12-29-2007, 07:33 PM   #2
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Don't you know a good dealership to take it too?When my TFI module was failing it acted like that but only when it was cold.
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Old 12-29-2007, 08:23 PM   #3
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idk if this will be any help to you but i was just pulling codes on my ranger and got the same code.

i found this link earlier when searching, it could be some help to you.

http://www.niehoff.com/techtips/n_sen.html
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Old 12-29-2007, 08:33 PM   #4
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Yeah that sounds like what its doing. I just went out and bought a new EGR valve anyways so I'll install it tomarrow and see what happens.
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Old 12-29-2007, 08:34 PM   #5
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it could also be the EGR valve position sensor
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Old 12-29-2007, 08:37 PM   #6
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That may be. I wonder if that sensor can have control over the ignition through the computer, since I really think its the ignition cutting off since the tach is dropping down.
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Old 12-29-2007, 08:39 PM   #7
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I just pulled the EGR code on my 88 f150 302 and my mechanic said the valve/tube/port going into the intake is more then likely clogged. He said all you have to do is chip it out, might want to take the throttle body out to get those chips out of the engine. I have yet to do it, but when I do, I am definately throwing in a throttle body spacer!!!
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Old 12-29-2007, 09:12 PM   #8
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from what i remember a clogged egr will cause a stumble.
the egr will play havoc with A/F ratio if stuck open or closed as well.
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Old 12-29-2007, 11:33 PM   #9
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I took mine off, disconnected the hose, removed the sensor, plugged the sensor back in, took off the vaccuum and pretty much every combination therein and never saw a difference...especially at idle.

EDIT: But in theory, a bad EGR valve can cause a stumble at idle and some bucking during accel.
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Old 12-30-2007, 01:35 AM   #10
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if it is stuck open it is a vaccum leak. mine did it when i first got it just not as bad as your mike
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Old 12-30-2007, 10:43 AM   #11
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You would have thought the dealership would have gotten this code and fixed it, or at least told you about it.
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Old 12-30-2007, 11:47 AM   #12
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"I pulled codes and got a 332, which is EGR valve opening not detected. My question is, would that make the truck surge very badly at times, and so far only after its been driven for nearly 2 hours? When the truck is turned off and cools down it seems to run OK again."

MikE2, I had the same issue a few years back it turned ot to be a couple of holes in the AIR crossover tube at the back of my engine, couple of wraps of exhaust tape verified the problem and got it running good again. I swapped the part out when I was in the area after I got headers.
Look straight up between firewall and back of engine, when engines COLD. You may need to feel around a bit, hope this helps.
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Old 12-30-2007, 12:02 PM   #13
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Quote:
Originally Posted by 94broncoxl View Post
You would have thought the dealership would have gotten this code and fixed it, or at least told you about it.
I would have been suprised if they could figure out something as easy as that
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