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Hestitation Issue - 2011 Tacoma w/TRD Supercharger

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Old 05-12-2013, 07:52 PM   #41
Stay Calm, and Fire For Effect
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Sub'd. Taking notes.
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Old 05-23-2013, 04:23 PM   #42
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Check the thing that the spark plug wires connect to, I think it's the distributer cap. If its not or a short/loose connection somewhere, it could be the computer. But the computers on vehicles rarely go bad.
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Old 05-23-2013, 04:24 PM   #43
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Is it possible that the computer erased the reflash?
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Old 05-24-2013, 09:48 AM   #45
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Quote:
Originally Posted by scottg918514 View Post
Since is random:


Check Engine Light On, P0300 Random Misfire Code

A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isnít getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean.
OP, had a similar issue with my Z06 which threw PO300. Checked injector harness for chaffing at the rear of the block, checked all chassis grounds, checked IAC, checked a bunch of other things. Ended up that I had blown out about 1" of my header gasket over the cylinder 1 primary causing the 02's to read unmetered air. Sorry if I missed it but are you experiencing any heavy fuel smell?
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