Ive got a truck that has a cold start issue. I believe its hpo related as the res is about an inch from being full and no oil pressure on the dash until the engine fires. I have had this happen before and the hpop has been the culprit, so i just swapped in a reman pump. Still the same problem. Am i down to the lpop and the check valve? How would i narrow down which one it is?
2000 cold start issue
- Thread starter Short Bus
- Start date
bhudson
Member
Ummmm 2000?
I have verified that there is no hpo until it fires and that the res is low. If the batteries hold out it will start. Or ether and it fires right off. glow plugs are operating, glowplug relay is operating and new injectors last year.
wned:
bhudson
Member
Haha no worries.
Sounds like LPOP to me. Keeping an eye on voltage?
yes voltage is good. I may tap into the 1/8 npt port down by the oil cooler and see what oil pressure reads there. Just dont want to throw parts at this thing.
Dieselsvt
New member
Not trying to insult...Did you check the oil level? Had one recently that needed 2.5 gals.
2001 7.3 swamps 175/146 single shots/ idm ts-6 chip.
2001 7.3 swamps 175/146 single shots/ idm ts-6 chip.
rookie mistake.... no.
Dirtclod
New member
I did that when I first bought my truck. Got to where it wouldn't start. 7 qrts low and she won't. I never found out what was wrong with that engine but it was doing close to same thing. Except no compression. Truck didn't smoke except for first crank of the day. That was glow plug module. Low batteries will do it to. 14.? Amps to crank. Fresh batteries,trickle charger, good flo plug module,fuel tank mods with reg return. These 7.3's with done imo are the best Diesel engine ever put in a 3/4 1 ton truck!
Agree on the not throwing parts, so its test time. Lets just work through it..
What issues were being chased with the injectors?
Has the truck run good?
What crank and idle LPO did you get at the res? (compare to the bottom port)
When it fires is it real ratty idle for a few mins or is it always clean?
HPO pump gear is tight?
Starts good when hot?
HPO rails sealed?
Will it build HPO if the injs are disabled and cranked on?
Was the IPR new?
Sorry for all the questions but wanted to be sure of what you've done and are working with. Ive been thinking about bleed down, pump gear, IPR operation/voltage and rail leakage.
IIRC the truck had several injectors not passing a contribution test. also replaced glowplugs at that time.
The truck runs great unless it sits for 6+ hours then the no start issue.
When it fires the engine sounds great, nice crisp throttle response.
Have not checked gear but i dont think thats an issue since there's no lack of hpo under wot.
yes it starts and runs great when hot.
I do not see any hpo rail leaks
dont know
IPR is original, i thought about swapping a new spare in just to see if it did anything.
Also verified that the ICP sensor is reading properly, it matches with the mechanical pressure gauge i installed.
bluedge8
Active member
I would definitely by checking lpo
Dirtclod
New member
Question bluedge? Is there a check valve that can go bad at hpop draining back to crankcase? If not a check valve is it ipr valve?
bluedge8
Active member
I'm not certain, but I believe '96 and up has an anti drain back valve in the hpop res.
Dirtclod
New member
So if that is draining back there wouldn't be enough pressure to startup?
