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-   -   4.7L overheating when idling and misfire #7 (http://www.ramforumz.com/showthread.php?t=150918)

Scramblurr 08-20-2013 01:28 PM

4.7L overheating when idling and misfire #7
 
As the title states, I have a misfire and overheating. The truck threw a P0307 code initially. I cleared it out hoping it was just random, but it came back a few days later. I had to take a 600 km trip on the weekend, and I had no issues with hesitation and no misfire.

On Saturday, I was driving and the truck started heating up rapidly when at a light. Once I started moving again, the temperature started to drop to normal. I was able to get back to where I was staying with no issues.

Sunday, I checked fluids and noticed there was a drop in the coolant level. I refilled and drove home. While stopped, the truck would still overheat. Once moving again it was fine, and I could drive for hours with no problems. Soon as I stopped at a light, overheat time.

Aside from ignoring traffic signals and pretending nothing has happened, I am not sure where to start to diagnose this. I plan on checking the plugs and wires, then compression on the cylinder. Could these two problems be related? Is there a way to check the fan clutch and the thermostat without too much trouble/cost?

RogerRamJet 08-20-2013 04:07 PM

#7 cylinder is misfiring. Why? I don't know. Coil pack may be going bad, plug could be bad, could be a few things. I don't think it is related to your fan clutch going bad. You could get a heat gun and put some heat to the clutch, then test the tension, but it's a pretty safe bet that the fan clutch has gone out. You can do 1 of 2 things. 1) you could replace the fan clutch or B) you could do the e-fan mod and get a few more horses out of the engine.

tjbiker031 08-21-2013 09:37 AM

When you get the engine up to normal operational temperature, the fan should kick on. You cant miss the noise of it running. Could also be a bad radiator.....

As far as the misfire. you can pull the plug and check the condition and replace based on how it looks. You can also buy a good HEI spark tester to see if you are getting spark from the pack to the plug.

Scramblurr 08-23-2013 09:48 AM

So I tested the fan clutch, and it seemed to be fine. I was getting worried, but for $30 I decided to try changing the thermostat. One coolant shower later, I had it running again. After a short drive, it started overheating again and would not remain stable. I got home, opened the hood and saw I forgot to seal the radiator cap. Damn! Refilled the rad, then topped up the reservoir and it was magic! I replaced with a stock unit, and the temp gauge now remains at just under halfway. The misfire hasn't come back so i'm hoping it was just related to the bad thermostat. Fingers crossed!!

RogerRamJet 08-23-2013 12:35 PM

Good to hear you fixed it.


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