What else causes a hard start?
Thread Starter
|
Elder User
Joined: Aug 2009
Posts: 946
Likes: 0
From: Clearfield County, PA
Try using an old screwdriver or other device and jump the 2 relay posts for about 20 to 30 secs and see if starts. Will verify not heating the glow plugs. Next check the small terminal for ground signal when key is turned on. Might not be a bad relay, might not be getting the required signal
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
With KOEO, the orange wire is a grd from the pcm sending that signal. Would think, remove it and with a multimeter, set to ohm and test it. Should be 0.00....i bench tested my relay to confirm that my pcm failed to send signal. Its why i have a ground switch to activate it
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,350
Likes: 5,945
From: Lake Hartwell, GA
With KOEO, the orange wire is a grd from the pcm sending that signal. Would think, remove it and with a multimeter, set to ohm and test it. Should be 0.00....i bench tested my relay to confirm that my pcm failed to send signal. Its why i have a ground switch to activate it
Does that ground wire go directly from the GPR to the PCM, or does it hit a bus or a connector anywhere first?
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
never really dug too far into it Souskazee...i went the path of least resistance and installed the new wire and switch..when measuring the "grd" side with it being hooked up factory wise, with gpr energized, no volts showing onboutput but 12.x showing onbthe ground side
Thread Starter
|
Elder User
Joined: Aug 2009
Posts: 946
Likes: 0
From: Clearfield County, PA
So the gp relay is working from time to time. Went to test it today and it was working and the truck started. So that issue will be taken care of however, the other issue is still around. The truck starts ok but once it fires, sounds sorta rough but idles at lower rpms and gradually gets higher rpms until it idles normally. It doesnt sorta search for rpms at idle. It seems to run good and then while driving on flat ground will also sometimes hunt for rpms. When on and off the throttle you never notice it. Also when it warms up it doesnt seem to really have the issues. I'm not sure what else to do to really test it. No ses light has come on recently either I'll try to scan it again once I get my new gp relay and see if I have anything to work off of
Thread
Thread Starter
Forum
Replies
Last Post
cabloom300
1999 - 2003 7.3L Power Stroke Diesel
60
Feb 6, 2019 09:10 PM
Milwaukee1979F150
1999 - 2003 7.3L Power Stroke Diesel
10
Dec 24, 2011 02:19 AM
