03 7.3 Rough Cold Start
#1
#2
Intake air heater might be having issues as well as glow plugs. It might be a combination of the 2. your valve cover gasket is unique it allows connections on it. you might want to start by checking those connections. Big possibility that those might be bad or not connected properly. check those if it is not them let us know.
#3
#4
Naw Glowplugs and valve cover gaskets are not hard and not that expensive.
---AutoMerged DoublePost---
I missed the part in your post that I just bolded and highlighted. You might want to get the checked for compression in that cylinder, and possibly checking the ECM for Codes. It might be possible that either an injector or a piston ring failure. Never hurts to have these things looked at by a local shop that you can trust before you spend the cash.
---AutoMerged DoublePost---
I missed the part in your post that I just bolded and highlighted. You might want to get the checked for compression in that cylinder, and possibly checking the ECM for Codes. It might be possible that either an injector or a piston ring failure. Never hurts to have these things looked at by a local shop that you can trust before you spend the cash.
Last edited by Rustin; 01-03-2011 at 05:15 PM. Reason: Automerged Doublepost
#5
With a test light and the key off, check both big terminals. One side should have power and the other should not.
Now turn the key on and check. Both sides should have power for about one minute to one minute 30 seconds...
If not, then replace your relay.
There are two relays there, the one closest to the turbo is the GPR, the other is for the Intake Air Heater...
Intake air heater might be having issues as well as glow plugs. It might be a combination of the 2. your valve cover gasket is unique it allows connections on it. you might want to start by checking those connections. Big possibility that those might be bad or not connected properly. check those if it is not them let us know.
The Intake Air Heater has nothing to do with cold starts, it is only used for extended idle conditions to help stop white smoke complaints. It does not even turn on unless the oil temp is above a preset level (notice I said ABOVE). It also will not turn on unless the truck is in park with the brake set...
IE, it never comes on.
#6
With 200k on it, it more then likely has several issues, Glow Plugs, Glow Plug Relay, And possable UVC (Under Valve Cover ) harness issues...
Need to get it scanned, but check the glow plug relay first off.
Once Warm, does it smooth out and run fine? If not, remove the oil fill cap and flip it upside down. Set it back on top of the filler neck. It should not blow off, it will move around, but should not blow off.
The following users liked this post:
Rustin (01-03-2011)
#7
The Intake Air Heater has nothing to do with cold starts, it is only used for extended idle conditions to help stop white smoke complaints. It does not even turn on unless the oil temp is above a preset level (notice I said ABOVE). It also will not turn on unless the truck is in park with the brake set...
IE, it never comes on.
#8
Sorry I never posted back to this, a lot has been going on since then. Anyway I never got the truck, the guy had already sold it when I called him. However, last weekend I got the greatest deal known to man. It's a '99 f350 dually service bed 6 speed and the 7.3. All it needs is the cam position sensor. Got it for (if you beleive me) 1500 bucks!
#9
Sorry I never posted back to this, a lot has been going on since then. Anyway I never got the truck, the guy had already sold it when I called him. However, last weekend I got the greatest deal known to man. It's a '99 f350 dually service bed 6 speed and the 7.3. All it needs is the cam position sensor. Got it for (if you beleive me) 1500 bucks!
#10