Question about 1999 Volkswagen Passat

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Car won't start...humming at the back center of engine

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I would check to make sure the fuel pump is working

Posted on Dec 30, 2010

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1998 Jeep grand cherokee Laredo turning over but won't start. It sounds like it wants to start but just won't power into it. We changed spark plugs w/in last year, brand new battery, the alternator...


When it sounds like it wants to start but won't, it is almost always a fuel problem. When you first turn on the ignition key (radio off, in a quiet setting) do you hear a faint 'hum' from the rear of the car? If so, your fuel pump is probably alright, so the next check it to remove the small, light green plastic cap (it might be black, about the size of a tire valve cap) on the top of the engine-it is part of the fuel rail and has a small pin in the center of it. With a rag in your hand, hold it over the valve, and with the key on, use a small screw driver and push the pin in-the rag will keep you from getting sprayed, if all is alright, but if you get little or nothing, you have a problem with your fuel pump, filter, fuel regulator or you may have a plugged 'sock' at the bottom of the tank.

Jul 19, 2011 | 1995 Jeep Grand Cherokee

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Engine won't crank. seems like no fuel getting to engine. Had the dealer replace the fuel relay worked for several days... replace it again myself....but still won't crank.


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Jul 16, 2011 | 2004 Nissan Armada

3 Answers

Car will start but won't stay running


Is the Check Engine Light on/ If yes, go to AUtozne & get codes read and report them here.

Also, try cleaning the MAF sensor and throttle bdy with spray carb cleaner.

Check for 40 psi of fuel pump pressure. Can you hear pump hum for 5 seconds when key is turned to ON? Listen at tank at rea of car, pump is in the tank.

May 15, 2011 | 1996 Ford Taurus

1 Answer

Computer


There's no code to reset the computer. Go out, turn the key on, but don't start the engine. The throttle position sensor sets itself up, and if you have an ATQ engine, you have a drive-by-wire throttle setup as well. In that case, the throttle body itself will align itself when you do this (you'll hear a humming from the back center of the engine). When the humming stops, you can crank up the car. My 99 A4 takes awhile to relearn everything - I'm usually in for a week's worth of surging idle and occasional stalling when I reconnect the battery after working on it, so give it some time.

Jan 22, 2009 | 1998 Audi A4

1 Answer

Dies after 1,000 rpms


Try this - disconnect the battery again for 30 minutes. Then reconnect it. Turn the key to full electrical power but don't crank the engine. You may hear a humming sound from the top rear center of the engine. This is the throttle body aligning itself. When the humming stops, you can start the car. You'll still have some stumbling for as much as a week, but it'll get better each day. If the throttle body alignment (TBA) isn't done, it can really mess up the driveability of the car.

Dec 17, 2008 | 1999 Audi A6

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