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  #1  
Old 08-20-2013, 01:28 PM
Scramblurr Scramblurr is offline
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Default 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?
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Old 08-20-2013, 04:07 PM
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#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.
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Old 08-21-2013, 09:37 AM
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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.
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Old 08-23-2013, 09:48 AM
Scramblurr Scramblurr is offline
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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!!
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Old 08-23-2013, 12:35 PM
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Good to hear you fixed it.
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