02 Dodge Ram po307 / overheating
Thread Starter
|
New Member
Joined: Jul 2016
Posts: 1
Likes: 0
02 Dodge Ram po307 / overheating
Hey guys
I have a 02 Dodge Ram with a 4.7lt
Last week it overheated after idling for a extended time. I took it to the shop and they replace a cracked over flow res. And said the block tested it and it was fine. I also got a check engine light the same day for a p0307 or po309 which ever one is 7 misfire. Could these be connected. I've notice my truck running like crap and it over heated again today after idling for a hour or two. ( that's the only time it over heats is when I let it ideal for a extended time then when I drive it my temp jumps to 220 or so.
I'm thinking head gasket but why only when it ideals for a long time and could this cause a #7 misfire and no other cylinder? I would think it would be a multi cylinder misfire. Idk
HELP!!!!!! Truck has 175000 miles or so.
I have a 02 Dodge Ram with a 4.7lt
Last week it overheated after idling for a extended time. I took it to the shop and they replace a cracked over flow res. And said the block tested it and it was fine. I also got a check engine light the same day for a p0307 or po309 which ever one is 7 misfire. Could these be connected. I've notice my truck running like crap and it over heated again today after idling for a hour or two. ( that's the only time it over heats is when I let it ideal for a extended time then when I drive it my temp jumps to 220 or so.
I'm thinking head gasket but why only when it ideals for a long time and could this cause a #7 misfire and no other cylinder? I would think it would be a multi cylinder misfire. Idk
HELP!!!!!! Truck has 175000 miles or so.
Last edited by Krreid73; Jul 12, 2016 at 05:02 PM. Reason: 175000 miles
Record Breaker
Joined: Dec 2005
Posts: 1,412
Likes: 2
From: Nashville
The 4.7L engines are prone to overheating due to the small cooling ports in the block.
Yes, do the compression test. Especially on #7.
Change the oil.
Change out the coolant. Flush the radiator, hoses and the system with 1/2 distilled water and 1/2 white vinegar only (or Prestone radiator flush). NEVER use tap water!
If you get distilled water in those water looking milk jugs, get a current made date on the jug. RO water and Berkey water are good to use too.
After the flush, do a rinse flush of only distilled water or the other types mentioned above.
Check the hoses for any that are soft or collapse too easy when squeezed. A hose will look good on the outside, take the clamp off and feel the inside of the hose. If it feels funny, replace it.
It the temps rise during idle, replace the T-stat too.
Sure this will take a whole afternoon and some cash to do, but it will rule out the cooling system from the overheating problem.
As for the oil change, use a half bottle of Gunk Motor Flush. Follow the bottle directions for the most part. DO NOT use a whole bottle on a high mileage engine like the bottle says to do.
Report back your findings please.
Yes, do the compression test. Especially on #7.
Change the oil.
Change out the coolant. Flush the radiator, hoses and the system with 1/2 distilled water and 1/2 white vinegar only (or Prestone radiator flush). NEVER use tap water!
If you get distilled water in those water looking milk jugs, get a current made date on the jug. RO water and Berkey water are good to use too.
After the flush, do a rinse flush of only distilled water or the other types mentioned above.
Check the hoses for any that are soft or collapse too easy when squeezed. A hose will look good on the outside, take the clamp off and feel the inside of the hose. If it feels funny, replace it.
It the temps rise during idle, replace the T-stat too.
Sure this will take a whole afternoon and some cash to do, but it will rule out the cooling system from the overheating problem.
As for the oil change, use a half bottle of Gunk Motor Flush. Follow the bottle directions for the most part. DO NOT use a whole bottle on a high mileage engine like the bottle says to do.
Report back your findings please.
Champion
Joined: Mar 2006
Posts: 4,739
Likes: 8
From: ct.
I run the napa 180 stat part number 530080, and get rid of that 203 stat if you let your truck idle for so long. misfire could be a small tear in the head gasket. you wont crack the block but you will warp the heads badly