Question about 2000 Chevrolet Blazer

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**** HELP!!!!! My 2000 blazer has been idling really rough, worse when the a/c is on, when low on fuel better when in park or neutral. It accelerates really slowly and has little power already, but the other day I rran out of gas and ever since it has been hesitating almost like it's going to die. Also the battery has been dying alot, I've had to jump the battery about five times in the last two weeks.Tried to plug it in at three different auto shops but the computer can't even get a reading on it. I've changed the spark plugs and am going to change the fuel filter. Any suggestions?

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Go for a long ride at night ,look at your catalytic converter if its glowing red ,it could be blocked

Posted on Nov 16, 2010

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There are a few possibility on this one. If you run it out of gas or really low on gas you could of sucked junk up from the bottom of the tank and you will need to replace your fuel filter. Another is that your fuel pump us going bad and you would need to check the pressure. Your throttle position sensor may have gone bad. Your idle control valve is another. Your map sensor or mas sensor could be bad

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http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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1 Answer

My 2000 Ford Expedition 5.4L V8 4x4 idles really bad when stopped at a red light. Sometimes it will just stall. It always starts back up. It goes just fine when I hit the gas, real smooth and powerful. It...


Check the idle fuel pressure. Load the electrical with headlights and heater defrost etc and see if problem gets worse. Attempt again with all accessories off. Could be fuel pump is getting low voltage at idle or fuel pump is failing. Bad fuel pump would definitely be a problem high fuel demand. Check vacuum line between pressure regulator to intake manifold.

Check for a air leak in the intake manifold. Gasket/hose etc. The P0171/P0174 is an indication that not enough fuel or tow much air. You can sometimes hear the air leak during idle.


Best solution is to use a graphic capable scan tool and watch the fueling trim/idle.


scan-tool-software-graph-a-rikgbt5tk1ywbo1m3dxzkw2o-3-0.gif

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1 Answer

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2 Answers

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Its because its not clogged fully it allows enough fuel to reach engine to keep it idling. Replace fuel filter. Other wise bad fuel pump or timing is off

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1 Answer

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1 Answer

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