Discussion Starter · #1 ·
I have a lot of engine hesitation, or a bog-down feeling when accelerating, as if it is not getting sufficient fuel. I was almost convinced to change out the filter/pump, which is in the tank on my model ('05 Tacoma). That job is no picnic (plus expensive!), and I do not want to undertake it unless I am convinced it is, in fact, a clogged filter. The reason I am doubting this particular analysis of the problem is because it will only hesitate when I am not kicking it into a lower gear. The "passing gear" will never cause the engine to hesitate at all, and I seem to get all the power I need. Since there is often more fuel required for such a demand, then a clogged filter would simply not allow it. And engine light has appeared three or four times. My OBD code reader indicated a lean fuel situation. Probable causes were vacuum leak or clogged filter. I reset the CEL, first time, but it reset itself after that, indicating to me that the lean fuel error occurs only when a lot of demand is placed on the engine (like when I vacationed in the mountains). Any ideas? I have changed the plugs, and visually inspected all such things as vacuum lines. All other scheduled maintenance has been maintained properly. Would 10% ethanol cause this problem? Forgot to mention.....cleaned the MAF more than a couple of times.