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About Ted Ritter
Expertise
I have more than 26 years experience as toyota technician, I will be able to answer most questions related to the toyota product line up to the present year models, I specialize in difficult to diagnose problems but when posting a question please keep in mind that some situations require the used of special test equipment and diagnostic procedures especially as the newer models become more technologically advanced, so without actually having the car on hand I may only be able to try to steer you in the right direction and in some cases may have to refer you to the toyota dealer but at least you will know what you may be dealing with. Please don't hesitate to ask any questions, I will have an answer for you in most cases. When posting a question keep in mind that I reside in the US, although I get questions from all over the world I may not have an answer for models that are not sold in the US, I will do a reasonable search to try to match your model to the US model,please refrain from asking about diesel powered vehicles, I have no information for them. In most cases I will not answer questions about major modifications of OEM components, engine swapping or aftermarket products,please post a question not a statement, please provide enough basic information such as year, model, what engine and if anything has already been done to fix the problem, the more information I get the more I can help without having to ask you more questions.

Experience
Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.

Education/Credentials
Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified.

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Toyota Repair - loss of power and hesitation on acceleration.

Expert: Ted Ritter - 11/4/2009

Question
'02 4runner, I have a loss of power on accelleration. The truck`s rpms jump rapidly like it is skipping but the speed increases as well. this only happens when i accell and only after speeds of higher than 40. The truck has been to 2 shops and neither knows what is wrong. One shop suggested the MAF which i changed and no difference and the other suggested fuel filter which made no difference. They stated that when they commanded the truck to suck more fuel that it ran much better. it commonly happens when i try to pass someone at WOT, if i let off the gas it drops back down and then i can gain speed normally. Both shops checked tranny for me and said its fine. thank you for any input

Answer
I assume the check engine light is not on or comes on and goes off, is this correct? Since most failures of input sensors would trigger a check engine light it would make sense that the light came on. If it's a fuel pressure issue then the light may not come on but even then it should since the fuel mixture will be too lean when this problem occurs, so before I try to diagnose this any further I would need to know if the light was/is on and what the diagnostic trouble codes are.

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