Automotive/engine reving

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Expert: Sean Halliday - 6/10/2007


Question
QUESTION: I have a 93 ford ranger an intermittently when I am slowing down and put in the clutch the engine will rev up making it hard to down shift. The truck will either just stop having the problem or I will need to shut it off and then restart it to solve the problem.theair intake control valve,egr valve and the o2 senser have been replaced

ANSWER: Check for vacuum leak at the intake manifold.Check all hoses for leaks and make sure your MAF sensor is working.Also the idle air control solenoid.

---------- FOLLOW-UP ----------

QUESTION: what is the MAF sensor?


Answer
It is between the air filter and throttle body.If you go to ebay and type in your ford ranger and year ,you will see a pic of it.It has a plug in and if you start the car then remove the plug,,,if the car stalls out then it is ok.If the idle differs(speeds up) then it is faulty.

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Sean Halliday

Expertise

general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.

Experience

40 years experience on all general auto repair.

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