Help with DOD cam swap
Mar 26, 2009 | 01:26 PM
#21
TECH Apprentice
Joined: Sep 2005
Posts: 376
Likes: 0
From: bakersfield ca
You left in the DOD lifters????? Holy crap. Okay, there could be two problems I can think of:
1) You installed the lifter trays in the wrong bores. As you may know, the DOD lifters when you look into the lifter tray have a big spring on them, 2 lifters side by side. These are the lifters that cannot fall out of the tray.
The DOD lifters go into drivers side cylinder # 1 and # 7 (most front and most rear).
and
Passenger side cylinders #4 and # 6, (the two middle cylinders).
Honestly, is sounds to me like you put the passenger side trays in the drivers side, and the drivers side trays into the passenger side. Completely backwards. The DOD lifters are now not aligned with the oil pipes to the LOMA, thus not getting any oil to open the valves. And....now the other 8 standard lifters are getting TOO MUCH oil.
Or,
2) You didn't connect the electrical connector to the LOMA unit (valley cover), and the DOD solenoids aren't passing oil to the lifters.
Or,
3) Both of the above.
In reality, you should have never put those lame-*** DOD lifters back into the engine. You had the heads off, you should have put LS7 lifters, trays and the LS2 valley cover on.
I'm not being a dick, but man oh man you went in that far and then reinstalled a screwed-up design back into your engine?
Sounds like you need to pull the intake manifold back off, see if the electrical connector is plugged in the LOMA. If it is, then unfortunately you are pulling the heads off again, to fix the real problem.
This time buy the right stuff and do it for real. Believe me, you would have hated the truck anyway after you got it running with the DOD lifters. They cannot handle a real camshaft lobe. In fact, the DOD cam has special lobes just for the DOD lifters/cylinders, and running a normal cam on them freaks them out and collapses them, and sets of p0300 codes, and makes the engine run poorly.
Remove those lifters.
If you are really tight on cash, just buy 8 standard 5.3 lifters and LS7 trays, and re-use the 8 normal lifters that are in your engine. You need to buy the LS2 valley cover also.
1) You installed the lifter trays in the wrong bores. As you may know, the DOD lifters when you look into the lifter tray have a big spring on them, 2 lifters side by side. These are the lifters that cannot fall out of the tray.
The DOD lifters go into drivers side cylinder # 1 and # 7 (most front and most rear).
and
Passenger side cylinders #4 and # 6, (the two middle cylinders).
Honestly, is sounds to me like you put the passenger side trays in the drivers side, and the drivers side trays into the passenger side. Completely backwards. The DOD lifters are now not aligned with the oil pipes to the LOMA, thus not getting any oil to open the valves. And....now the other 8 standard lifters are getting TOO MUCH oil.
Or,
2) You didn't connect the electrical connector to the LOMA unit (valley cover), and the DOD solenoids aren't passing oil to the lifters.
Or,
3) Both of the above.
In reality, you should have never put those lame-*** DOD lifters back into the engine. You had the heads off, you should have put LS7 lifters, trays and the LS2 valley cover on.
I'm not being a dick, but man oh man you went in that far and then reinstalled a screwed-up design back into your engine?
Sounds like you need to pull the intake manifold back off, see if the electrical connector is plugged in the LOMA. If it is, then unfortunately you are pulling the heads off again, to fix the real problem.
This time buy the right stuff and do it for real. Believe me, you would have hated the truck anyway after you got it running with the DOD lifters. They cannot handle a real camshaft lobe. In fact, the DOD cam has special lobes just for the DOD lifters/cylinders, and running a normal cam on them freaks them out and collapses them, and sets of p0300 codes, and makes the engine run poorly.
Remove those lifters.
If you are really tight on cash, just buy 8 standard 5.3 lifters and LS7 trays, and re-use the 8 normal lifters that are in your engine. You need to buy the LS2 valley cover also.
Mar 26, 2009 | 02:28 PM
#23
Staging Lane
Joined: Jan 2009
Posts: 51
Likes: 0
Hopefully now the original problem is that the engine never got up to speed to fill the bled-down lifters with oil, thus the multiple cylinders with no fire.
I still think you are going to have to analyze whether you want the engine to be operated long-term with the AFM/DOD lifters installed, and the LOMA routing oil, yet de-activated.
If you have any valvetrain noises, "ticking", knocking, intake backfires, no "lope", poor horsepower or loss of power, or constant p0300 codes, I am sure these conditions will make up your mind on going back in and restoring the system to a LS7/LS2 configuration.
I still think you are going to have to analyze whether you want the engine to be operated long-term with the AFM/DOD lifters installed, and the LOMA routing oil, yet de-activated.
If you have any valvetrain noises, "ticking", knocking, intake backfires, no "lope", poor horsepower or loss of power, or constant p0300 codes, I am sure these conditions will make up your mind on going back in and restoring the system to a LS7/LS2 configuration.
Mar 26, 2009 | 02:44 PM
#24
i am defenatly taking your advise and changing these out as soon as i get the chance. thanks for the help by the way i was almost just going to take it to someone and say just fix it
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