Engine misses/stumbles when cold.
Thread Starter
|
New User
Joined: Feb 2007
Posts: 18
Likes: 0
From: Wake County NC
Engine misses/stumbles when cold.
I have a 1995 F350 with a 7.3 with about 195,000 on it. Recently, it has started to miss/stumble when it is cold. It will always start right up, but will die shortly if left at an idle. If I start it up and rev it up, its RPMs will die back and rev back up over and over again. It does not seem to be spewing any smoke, so I am assuming that fuel is not being injected while it is stumbling. If I run it for 5 to 10 minutes, it will run fine.
I recently replaced all 4 of the under valve cover harnesses, both valve cover gaskets, the glow plug relay and replaced one of the connectors to the valve cover gasket. I replaced the wiring because it was burnt and the GPR because it was bad. I do not have a scanner and do not know anybody with one. The engine has plenty of oil in it and has about 1000 miles since the last change.
Any help as to what to check would be greatly appreciated
I recently replaced all 4 of the under valve cover harnesses, both valve cover gaskets, the glow plug relay and replaced one of the connectors to the valve cover gasket. I replaced the wiring because it was burnt and the GPR because it was bad. I do not have a scanner and do not know anybody with one. The engine has plenty of oil in it and has about 1000 miles since the last change.
Any help as to what to check would be greatly appreciated
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
I agree with Tim, sounds like too heavy a weight oil for the temp. Try a 10W-30 or if it's in the low teens, a 5W-30. Let us know after you have it plugged in over night how it starts and what weight oil your running.
Thread Starter
|
New User
Joined: Feb 2007
Posts: 18
Likes: 0
From: Wake County NC
Thank for the response.
Unfortunately I do not have a block heater. I live in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com
ffice:smarttags" /><st1:State w:st="on"><st1
lace w:st="on">North Carolina</st1lace></st1:State> and it was only getting down to the 40s at night when I observed this problem. I am running 10w30 in it now. I have to admit that I have not driven it much in the last 6 months because I was putting off the purchase of the wiring harnesses.
Do you think romping could be a problem with lows in the 40s?
Thanks
Unfortunately I do not have a block heater. I live in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com
ffice:smarttags" /><st1:State w:st="on"><st1lace w:st="on">North Carolina</st1lace></st1:State> and it was only getting down to the 40s at night when I observed this problem. I am running 10w30 in it now. I have to admit that I have not driven it much in the last 6 months because I was putting off the purchase of the wiring harnesses. Do you think romping could be a problem with lows in the 40s?
Thanks
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Originally Posted by 68GTFastback
Thank for the response.
Unfortunately I do not have a block heater. I live in ffice:smarttags" /><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com[img] /><st1:State w:st=[/img]<ST1lace w:st="on">North Carolina</ST1lace></st1:State> and it was only getting down to the 40s at night when I observed this problem. I am running 10w30 in it now. I have to admit that I have not driven it much in the last 6 months because I was putting off the purchase of the wiring harnesses.
Do you think romping could be a problem with lows in the 40s?
Thanks
Unfortunately I do not have a block heater. I live in ffice:smarttags" /><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com[img] /><st1:State w:st=[/img]<ST1
lace w:st="on">North Carolina</ST1lace></st1:State> and it was only getting down to the 40s at night when I observed this problem. I am running 10w30 in it now. I have to admit that I have not driven it much in the last 6 months because I was putting off the purchase of the wiring harnesses. Do you think romping could be a problem with lows in the 40s?
Thanks
Do one test at a time....
Thread Starter
|
New User
Joined: Feb 2007
Posts: 18
Likes: 0
From: Wake County NC
Thanks for the great advice. I will check the HPOP Res and unplug the ICP and check for leaks as advised. When I started having this problem, I did not even know that the injectors were actuated by high pressure oil.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This problem does not happen when the truck is warm.
<o></o>
I did a search on the romping on this sight and I am not sure if I am experiencing romping. I am not just having a fluctuation of RPMs. It seems to me that the injectors are completely stopping and then starting again. The drop in the RPMS is as if the engine has been shut off and turned on again over and over again. This happen at all RPMs until the engine has been running for a while. Is his romping?
My worry is that it is some electronic control device that will finally stop working while I am further from home than AAA will tow me.
<o></o>
Thanks.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
fficeffice" /><o></o>This problem does not happen when the truck is warm.
<o
></o>I did a search on the romping on this sight and I am not sure if I am experiencing romping. I am not just having a fluctuation of RPMs. It seems to me that the injectors are completely stopping and then starting again. The drop in the RPMS is as if the engine has been shut off and turned on again over and over again. This happen at all RPMs until the engine has been running for a while. Is his romping?
My worry is that it is some electronic control device that will finally stop working while I am further from home than AAA will tow me.
<o
></o>Thanks.
Trending Topics
Posting Guru
Joined: Nov 2006
Posts: 1,059
Likes: 0
From: Herndon KY
It sounds like a Cam Position Sensor now with your further description. THat part should be 25 bucks at the dealer, and you may fall under a recall where they will replace it for free. The CPS is very easy to install, you need a flathead screwdriver a 10mm socket (I use a deepwell) a ratchet and a small extension is preferrable.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Elder User
Joined: Nov 2005
Posts: 555
Likes: 0
From: Cincinnati OH
Originally Posted by bkcowboss
It sounds like a Cam Position Sensor now with your further description. THat part should be 25 bucks at the dealer, and you may fall under a recall where they will replace it for free. The CPS is very easy to install, you need a flathead screwdriver a 10mm socket (I use a deepwell) a ratchet and a small extension is preferrable.
Thread Starter
|
New User
Joined: Feb 2007
Posts: 18
Likes: 0
From: Wake County NC
Thank you, thank you, thank you.
It worked. I plugged in a new CPS and the injectors cutting out problem went away.
Oddly enough, the truck started spewing white smoke out of the exhaust. I am hopping that this is just a temporary consequence of the computer getting the correct signal for a change. I did not have time to run it for long, but I will run it again tomorrow.
It worked. I plugged in a new CPS and the injectors cutting out problem went away.
Oddly enough, the truck started spewing white smoke out of the exhaust. I am hopping that this is just a temporary consequence of the computer getting the correct signal for a change. I did not have time to run it for long, but I will run it again tomorrow.
Thread
Thread Starter
Forum
Replies
Last Post
Grinder Man
1997 - 2006 Expedition & Navigator
14
Oct 10, 2014 09:35 AM
BigGreen7.3swap
1994.5 - 1997 7.3L Power Stroke Diesel
13
Sep 28, 2014 09:21 PM
Technocrsr
1999 - 2003 7.3L Power Stroke Diesel
3
Jun 6, 2007 08:27 PM
