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  #1  
Old 11-08-2012, 09:34 AM
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Question Multiple Misfire Codes With No Supporting Evidence!

My engine light has been on and sometimes flashing at me so I hooked up my SC programmer and it read three codes: P300, P302, and P303 (multiple misfires in cylinders 2 and 3). I asked three buddies of mine who're licenced techs to take a look/drive and none of them noticed any signs of a misfire. The truck runs fine, idles steady, and sounds great.
My first thought, since I can smell coolant burning after long highway trips (no white smoke coming from exhaust though), was a cracked head or a head gasket but then I was told that those cylinders are on opposite banks so the chances of that are slim to none (right?). Also, the guy before me said he put in new plugs, wires, and rotors. My next thought was possibly a crankshaft position sensor - but again, the truck idles, sounds, and runs just fine.

If anyone has any experience or opinion to share AT ALL, please do! I hate seeing the engine light constantly (and no I wont put tape over it) and not knowing what it is.
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Old 11-08-2012, 09:43 AM
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Check the intake manifold plenum pan gasket and see if it's blown. Are you consuming any oil between changes?
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Old 11-08-2012, 09:49 AM
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Not even 500mL (half a quart?) of oil over 3500mi, figure that's "normal" for a 165k engine though. What i'm more worried about is the slight coolant consumption seeing as that shouldn't be going anywhere at all lol
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Old 11-08-2012, 09:55 AM
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Ok, Just wanted to start with the obvious. he only way to be 100% sure is by checking it with a vacuum gauge but it sounds like that isn't the culprit. Have you pressure tested the cooling system or done a chemical test to see if combustion gasses are entering the cooling system?
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Old 11-08-2012, 10:44 AM
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No, I haven't done that, I'm assuming that'd have to be done at a shop?
And speaking of vacuums, there is a faint high-pitch whistle sometimes between 1500 and 2000 rpms, could that be related and/or helpful?
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Old 11-08-2012, 11:03 AM
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Here is the bulliten on diagnosing the plenum pan gasket (sometimes referred to as a belly pan). http://www.ramforumz.com/showthread.php?t=46305
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Old 11-08-2012, 11:18 AM
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Thanks for the link. Is this what you suspect is triggering the misfire codes then?
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Old 11-08-2012, 11:23 AM
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It's possible. The rear cylinders are usually the first to be affected but that's not a hard and fast rule. The fact that the cylinders aren't side by side steers me away from a head or gasket issue unless this engine has been severely overheated. pressure testing the cooling system and cap would be high on my diagnosis list after verifying the secondary ignition system is in good working order.
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Old 11-08-2012, 11:50 AM
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Perfect. Thanks for all of your help! I'll post the results of those tests on here once I get them done.
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Old 11-10-2012, 03:20 PM
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Agreed. The plenum gasket is my first thought. Having both heads crack at the same time (unless abused as mentioned by Ramtech) would be a twisted rarity. If you're smelling coolant, could just be a small leaker in a cracked hose. Need to get under the hood and look for drips or steam.
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