EGR Low Flow
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Elder User
Joined: May 2002
Posts: 778
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EGR Low Flow
Hey all, class is in session. This is a test. We have a 98 F-150 with a 4.6 I have the egr low flow problem. I changed the egr control solenoid which was full of dirt. It ran good for a week, then it came back with egr low flow. The feedback pressure transducer voltage was at .97 volts and would not change by use of a vacum guage or engine. I then replaced it. The new one is a plastic one not steel like the old one. The voltage went up to a max of 1.29 volts with a 89% egr regulation. Our shop manual does not have the info i need on this situation, but what i have does not fit the limits. So far the truck has not come back. Ok class send your papers to the front of the class. 
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
EGR Low Flow
The most common problem on these is the PFE sensor but since you already replaced that we'll rule it out. Seeing that voltage only goes up to 1.29 that would still indicate low flow. With full vacuum applied to the EGR you should be able to get the PFE voltage up over 4V. I'd be inclined to pull the EGR valve and the throttle body off and check for plugged EGR passages in the intake.
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Elder User
Joined: May 2002
Posts: 778
Likes: 1
EGR Low Flow
Thanks Racerguy. I will try those things next. So far the truck has no complaints, but i feel it will just be a matter of time. The Egr had some build up in it, and when vacum was applied to it. It had only a slight effect on the motor. I replaced the Egr valve as a precaution. I will let you know if any thing happens. Thanks for your reply, and all the info you have shared with us. 
