98.5 cummins hard start
03-01-2017, 10:02 PM
#1
Registered User
Thread Starter
Join Date: Mar 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
98.5 cummins hard start
I have a 98.5 Dodge Cummins 24 valve. Has the pump in the tank that is putting out 12 psi at 2000 rpm 9psi under load. The problem is that it has a hard start issue it fires up in the morning no problem but when I drive it and it gets warm and then I will let it sit for an hour so then it has hard start. Everything I have read online people with this issue have it not starting in the morning mine fires up in the morning without any problems. Help!
Last edited by akina67; 03-01-2017 at 10:17 PM. Reason: Missed something
03-02-2017, 12:17 PM
#2
Registered User
I had that problem with my `99 after I had the block mounted lift pump and IP replaced. He installed an after market pump that put out a higher pressure than the OEM. I found on here that that can cause a 'Hard hot start'. The guy picked it up, replaced the higher press pump with the OEM and all has been fine since then and that's been a few years back. Don't know if that's your issue but worth looking into.
03-02-2017, 05:17 PM
#3
Registered User
Another quick test-
When hot, bump the starter and wait for 40 seconds and try to start- if it fires up immediately it should be a problem with too high pressure from the lift pump while starting.
The VP 44 loves 0-7 psi while starting and 10-15 psi while running.
When hot, bump the starter and wait for 40 seconds and try to start- if it fires up immediately it should be a problem with too high pressure from the lift pump while starting.
The VP 44 loves 0-7 psi while starting and 10-15 psi while running.
03-02-2017, 09:54 PM
#4
Registered User
Thread Starter
Join Date: Mar 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Thanks tried that didn't work. I'm thinking air getting into my system somewhere so I'm trying to trace down on my lines. According to the Old owner the pump has been on there for quite a while.
03-02-2017, 09:58 PM
#5
Registered User
Thread Starter
Join Date: Mar 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
I had that problem with my `99 after I had the block mounted lift pump and IP replaced. He installed an after market pump that put out a higher pressure than the OEM. I found on here that that can cause a 'Hard hot start'. The guy picked it up, replaced the higher press pump with the OEM and all has been fine since then and that's been a few years back. Don't know if that's your issue but worth looking into.
03-03-2017, 03:20 AM
#6
Registered User
OK, now try the following: Drive the truck until warm, let it sit until it has the hard start condition.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
03-03-2017, 09:40 AM
#7
Registered User
Thread Starter
Join Date: Mar 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
OK, now try the following: Drive the truck until warm, let it sit until it has the hard start condition.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
Trending Topics
03-03-2017, 10:38 AM
#8
Registered User
OK, now try the following: Drive the truck until warm, let it sit until it has the hard start condition.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
Before trying to start cool the VP44 by trickling some cold water over it.
If it can be brought to fire up immediately like this it's VP44 time.. electronics toast.
03-03-2017, 12:40 PM
#9
Registered User
Well, I don't like to give those messages.. but sometimes they are not to be avoided.
Read here:
https://www.bluechipdiesel.com/vp44_diagnostics.html
Especially the chapter HARD START WARM OR HOT,
LONG CRANK TIMES
Good Luck!
Read here:
https://www.bluechipdiesel.com/vp44_diagnostics.html
Especially the chapter HARD START WARM OR HOT,
LONG CRANK TIMES
Good Luck!
03-04-2017, 11:01 AM
#10
Registered User
Well, I don't like to give those messages.. but sometimes they are not to be avoided.
03-04-2017, 03:40 PM
#11
Registered User
Well... the VP 44 dies from different causes:
1.) Wear on the distributor and housing-- postponed by better lubrication added to the fuel
2.) Heat cycling the electronic part-- remedied by living in alaska and only long distance driving.
3.) low fuel pressure- restricted fuel supply--- remedied by a number of vendors who tell you that they have the end-all solution to aal the world's problems.
(This post may contain traces of cynicism -contact whoever you want in case of... )
1.) Wear on the distributor and housing-- postponed by better lubrication added to the fuel
2.) Heat cycling the electronic part-- remedied by living in alaska and only long distance driving.
3.) low fuel pressure- restricted fuel supply--- remedied by a number of vendors who tell you that they have the end-all solution to aal the world's problems.
(This post may contain traces of cynicism -contact whoever you want in case of... )
03-08-2017, 12:05 PM
#12
Registered User
Thread Starter
Join Date: Mar 2017
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Hard start after running
Well I did the run water over the injection pump 4 different times and each time it started up after I did it so I am ordering a new injection pump I'll let you know how it goes. Thanks for the help
Thread
Thread Starter
Forum
Replies
Last Post