If they start to rise and hold steady above 20% this is a good indication that the fuel pump cant keep up with the pressure and volume demand and the PCM is holding the injectors open for a longer and longer period. Let her idle for a minute and watch the fuel trims then slowly increase the engine speed and watch the trims. A negative number means that fuel is being taken away and a positive number means that fuel is being added. Ideally, both should be around 0 but 5 to 8 percent either side of zero is "acceptable". What you are wanting to look at are the long term and short term fuel trims. a certain # of misfires in a given period is a good example. Pending issues are issues where there is a problem but it hasnt yet risen to the point of setting off the CEL. While at the parts store ask if the scanner that they will be using has live data provisions and the capability to check for pending issues. Just because the CEL isnt on does not mean that there isnt any information to be gathered by putting a scanner on it. If you live in a reasonably sized city there should be a auto parts store that can check codes for you for free. My second suspicion suspecting that your fuel pump is questionable because you state that an immediate opening of the throttle causes a miss, classic issue of a fuel pump failing. Without being there and looking at everything, my first gut reaction is rats nibbled on some wires (any signs of rat poop under the hood?) because it sat but it could be almost anything. Any leads would be greatly appreciated, leaving it at the mechanic for them to screw around at $120/hr and come up with nothing really isn't working for me. Anyone have any experience with this? I couldn't find anything on the forums. BUT NOT ALL DAYS! I'm not leaking coolant and I lose about 1/2 qt of oil between changes.īecause it's so sporadic I'm leaning toward an issue with the fuel pump or an electrical issue related to ignition. For some shitty reason it ran perfectly for him and didn't show any symptoms for about a week after, but now exhibits symptoms nearly every day.
Toyota rav4 2004 loss of power cracked#
Initially he believed I might have a cracked head/bad head gasket leaking into one of my cylinders causing it to misfire, but after a leakdown test he ruled that out. Things I have done: changed spark plugs, inspected cables for obvious housing issues, replaced fuel filter, replaced air filter, run Seafoam through the system a few times. I have no check engine codes in the computer and the light has never come on. When the truck is running well I have no power issues whatsoever. Sometimes the power will come back gradually as I pump the throttle: First pump nothing, second pump nearly nothing, third pump a lil something, fourth pump and we're off! If the throttle is unresponsive and I simply hammer down, nothing (AT ALL) happens for about 3 or so seconds, then it comes back to itself and I'm peeling off. I seem to be able to cause the symptoms if I hammer down on the throttle then suddenly let off, then push on the throttle again. The present iteration of the problem is very sporadic: I can drive 100 miles on the highway and have no power loss, but when I go to pull into the gas station at the end of those miles I'm frantically pumping the throttle trying to get it to do anything at all. The power loss can be a little blip you hardly notice or a total loss of power for a few seconds. I no longer have any rough idle at start, but I never let it sit for more than 2 days. If it sat for more than 6 or so days it would repeat the same set of symptoms, but if I drove it regularly the symptoms went away.įast forward to today: I'm driving the truck almost every day for work now and I'm randomly losing power no matter how much I drive it.
Initially this problem correlated to how long I let the truck sit. After about 45 minutes it started driving like nothing happened.
It seemed to happen predictably (75% of the time) when I would let off the throttle for a second then push it down again, a.k.a when shifting gears. After about 5 minutes it was idling fine, but it would randomly lose power when driving at a constant speed for 1-3 seconds (not electrical, it acted like I let off the throttle). It started with very little hesitation, but immediately started acting like it was missing on 1-2 cylinders the whole truck was shaking like a bastard. About 6 months ago I let my truck sit for about 10 days without even starting it up. I recently moved to a new area where I initially needed to drive my truck much less often. Truck: 2003 3.4l 4x4 TRD xtracab, manual.
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