nunman

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Question Asked: at operating temp the truck stumbles at idle
January 16, 2013, 06:55 AM
I have a constant low vacuum at the EGR valve less than 5 Hg at idle, which it seems is enough to move the diaphragm in the ERG valve. I replaced the EGR solenoid, and I have voltage at the solenoid plug. However if I disconnect the Solenoid plug I still have vacuum at the EGR. I removed the EGR vacuum hose and plugged it, put a vacuum Gage in the system at the intake manifold I get about 17Hg. Reconnect the EGR vacuum line and it drops to about 15Hg. I am stumped
Question Asked: trouble started as a P0401 EGR Low Flow
January 06, 2013, 03:23 PM
I changed all the vacuum lines, changed the ERG, and solenoid pump. The truck stumbles once i put the vacuum line on the ERG valve(runs smooth with out the vacum line on the EGR vavle). Can anyone suggest a system to look at?
Question Asked: P0401 Changed ERG valve and Pump, replaced all vacum lines
December 26, 2012, 04:03 PM
Cleard the code but it still runs rough at idol, anything els to check?
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