Question about Cars & Trucks
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Posted on Jan 02, 2017
Common issue at the shop (i'm a ford technician), here is what I do to correct it.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Mar 11, 2009
The smoke and the the bogging down are due to either too much fuel flow or to too little airflow. Your engine is flooding and running way to rich hence the low fuel mileage. Could be a faulty pump with too high pressure, bad or wrong sized injectors, (assuming they actually fixed the sensor problem) or airflow restriction,
Posted on May 08, 2009
You have a bad coil pack, they usually crack from age and heat. It's best to replace them all. Check for a VW recall on this item.
Posted on Dec 22, 2009
Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.
Posted on Jun 22, 2010
Testimonial: "Thank you for your tips and ideas you have gave me, One question, but before read my latest update. my car rpms hover around in between 1100 to 1500rpm at idle, but when I shift into drive it goes to a steady 1000rpm... is that good? if not, what are the correct specs. thanks again"
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