Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
2003 dodge ram 1500 engine trouble
10-23-2015, 06:30 PM
Post: #1
2003 dodge ram 1500 engine trouble
. My 2003 dodge ram 1500 hemi 5.7L is giving me some problems. First off when i fill my truck up w/gas and drive a few miles the gas lite comes on and The gauge goes to empty. After i drive it ~50 miles the gauge goes back full. Another issue i am having is that when i start up the truck the engine oil pressure is low and the check gauges light is on but after i shut the engine down and restart it the light is cleared and the oil pressure is back to normal. Finally, I don't know if this could contribute to this but the A/C clutch fan went out and i just replaced it but recently the engine started like surging. In idle the rpms bounce from 1k to 1.5k. I thought it could be bad fuel but i noticed that when it surges the lights go dim as the rpms bounce. My obd II scanner shows up the code 522 which is the oil pressure sensor but i have checked the oil, charged the battery, checked all of the fuses. I dont know what else to do except change out the oil pressure sensor. But i dont know if it will fix the surging because the pressure gaue has been messing up. One more thing is when i get it up to speed the surging makes it feel like the engine is loose or a bad tire or something be ause it vibrates bad. What could cause this?
Find all posts by this user
Quote this message in a reply
10-23-2015, 09:01 PM
Post: #2
RE: 2003 dodge ram 1500 engine trouble
Let's tackle the easy stuff first. I suspect the oil pressure issues is actually the sender and they are known to go bad.

The gas gauge problem is likely the sending unit as well. I haven't worked on too many Mopars recently but based on the age of the vehicle that's my first guess.

The surging speed could be a variety of things. What I'd do is a visual inspection of the vacuum lines and possibly replace them all just to eliminate the possibility of a leak or one that is too soft and collapses when warm. They are cheap and you might even save yourself a problem down the road by doing them as a preventive measure. The second thing I would do is clean the Idle Air Control in the throttle body. If it's dirty it may not be able to respond to changing load conditions. It should be done say every 50k miles anyway. If you are not sure how to do this we can walk you through the basics. There's other things but let's go the easy route first.

Not sure what you mean by "A/C clutch fan" and I'd have to guess you either mean the coupling on the engine cooling fan or the clutch on the A/C compressor. If the engine surges as the A/C comes on and off that likely goes back to the IAC not working correctly. Please clarify and I'll try to help.
Find all posts by this user
Quote this message in a reply
10-23-2015, 10:08 PM
Post: #3
RE: 2003 dodge ram 1500 engine trouble
(10-23-2015 09:01 PM)Rupe Wrote:  Let's tackle the easy stuff first. I suspect the oil pressure issues is actually the sender and they are known to go bad.

The gas gauge problem is likely the sending unit as well. I haven't worked on too many Mopars recently but based on the age of the vehicle that's my first guess.

The surging speed could be a variety of things. What I'd do is a visual inspection of the vacuum lines and possibly replace them all just to eliminate the possibility of a leak or one that is too soft and collapses when warm. They are cheap and you might even save yourself a problem down the road by doing them as a preventive measure. The second thing I would do is clean the Idle Air Control in the throttle body. If it's dirty it may not be able to respond to changing load conditions. It should be done say every 50k miles anyway. If you are not sure how to do this we can walk you through the basics. There's other things but let's go the easy route first.

Not sure what you mean by "A/C clutch fan" and I'd have to guess you either mean the coupling on the engine cooling fan or the clutch on the A/C compressor. If the engine surges as the A/C comes on and off that likely goes back to the IAC not working correctly. Please clarify and I'll try to help.
0
I am not sure I knew what I meant by saying that either. Mind was thinking about multiple things. I meant to say I replaced the electric A/C condenser fan. But no it is an issue whether I turn the A/C on have it off. On the way home from work today the engine light came on and i pit my code scanner on it and got P0172 & P0685
Find all posts by this user
Quote this message in a reply
10-23-2015, 11:12 PM
Post: #4
RE: 2003 dodge ram 1500 engine trouble
The P0172 code is "rich bank 1" so may or may not be related to other issues. (vac hoses, etc) the other code seems to point to the ASD relay, which means "Automatic Shut Down" and controls the fuel punp in case of a crash, over boost, and a few other conditions. (battery problems may be the first choice to look at)

The ASD circuit has a fuse too. If it's blown you may have a no-start issue. The relay can also go bad and make the fuel pump run intermittently, or cut out. Bad contacts might also cause the fuel pressure to wander around. You can check that with a gauge. If the fuse is blown I hear it may be due to melted wires near the EGR feed tube. (HOT, as in exhaust gas)

BTW, over my 45 years in the field it seems like anything Mopar has issues if the battery voltage isn't on the money. (starting with the 1975 "lean burn" V-8) It's kinda like the chicken or the egg question. If all else fails borrow a known good battery and do all of your diagnosis from scratch.

Keep us posted.
Find all posts by this user
Quote this message in a reply
10-24-2015, 02:13 PM
Post: #5
RE: 2003 dodge ram 1500 engine trouble
(10-23-2015 11:12 PM)Rupe Wrote:  The P0172 code is "rich bank 1" so may or may not be related to other issues. (vac hoses, etc) the other code seems to point to the ASD relay, which means "Automatic Shut Down" and controls the fuel punp in case of a crash, over boost, and a few other conditions. (battery problems may be the first choice to look at)

The ASD circuit has a fuse too. If it's blown you may have a no-start issue. The relay can also go bad and make the fuel pump run intermittently, or cut out. Bad contacts might also cause the fuel pressure to wander around. You can check that with a gauge. If the fuse is blown I hear it may be due to melted wires near the EGR feed tube. (HOT, as in exhaust gas)

BTW, over my 45 years in the field it seems like anything Mopar has issues if the battery voltage isn't on the money. (starting with the 1975 "lean burn" V-8) It's kinda like the chicken or the egg question. If all else fails borrow a known good battery and do all of your diagnosis from scratch.



Keep us posted.

I. Changed out the oil pressure switch and cleared the codes last night and it didnt help. This evening im going to check all of the fuses, relays, and connections. Do you think it could be caused from an O2 sensor or the mass flow?
Find all posts by this user
Quote this message in a reply
10-24-2015, 02:30 PM
Post: #6
RE: 2003 dodge ram 1500 engine trouble
Depends on which problem you mean. The MAF will generally set it's own code and will affect both cyl banks. A bum O2 sensor might affect one bank... but only maybe. The forward sensor is in charge of trying to control the mixture and the rear most sensor just reports on the final result. (rich, lean, or OK) Typically you will get a code for an O2 sensor that is out of range for too long. The code will be followed by some numbers such as 1/1 or 1/2... 2/1 or 2/2. That tells you which sensor is out of range, say bank 1 sensor 1 (front) sensor on the side with #1 cyl.

Since you haven't mentioned any O2 codes I suspect the sensors themselves are fine and you need to dig into something that only affects one bank, or possibly a single cylinder. Here's where you may want to do something the old fashion way, like pulling the plugs to see if it's an issue with 4 cyls or maybe a single cyl. That will help narrow things down.
Find all posts by this user
Quote this message in a reply
11-16-2015, 05:50 PM
Post: #7
RE: 2003 dodge ram 1500 engine trouble
Well here is where i am now. I changed all of the spark plugs and plug wires an ran the obd scan and got P0172 P0300 P0300 pd & P0305. I got these codes once before and but it cleared so I decided to runa compression test on coil #5 and had no compression. Pulled the vavle cover and there laid the problem. A busted valve spring on #5. It had broke in several places and the push rod was bent. I ran another compression test on it to make sure the valve wasn't damaged or the piston was busted and had good compression. So I ordered a valve spring and push rod yesterday and waiting for them to come in. I will let uou know how everything turns out
Find all posts by this user
Quote this message in a reply
11-16-2015, 06:37 PM (This post was last modified: 11-16-2015 06:46 PM by Rupe.)
Post: #8
RE: 2003 dodge ram 1500 engine trouble
Broken spring? Hmmmmm!

Can you move that valve by hand or is it stuck? Even if the piston is all the way up you should be able to move it somewhat.

When the valve is all the way up is the height the same as the others that are also up? If not, then you may have a bent valve and need to remove the head.

BTW, there are tools made to compress a valve spring without removing the head. (if there's no other damage)

Hint: with the plug removed stuff a few feet of rope (clothes line or similar) into the cylinder leaving a tail for removal. With a wrench, turn the front of the crankshaft till the piston pushes the wad of rope tight against the valves holding them up from the inside. Now you can do the repair without dropping the valve inside the engine and without having to use compressed air. When done simply back the engine up a bit with the wrench and pull out the rope.
Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)