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Poor gas milage ruff idle - 2000 Mercury Sable

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Have a compression test. Your valve maybe leaking. Check also your ignition timing.

Posted on Nov 09, 2012

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Ford f250 runs ruff and will not idle


fuel pressure should be 35 - 45 psi.could have faulty tps sensor.could have intake vacuum leak or ignition timing valve timing off due to worn timing chain.do engine vacuum test replace all vacuum hoses bad leaking egr valve diaphram or gasket will cause engine run poorly.

Jul 29, 2013 | 1997 Ford F250 SuperCab

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Not picking up gas when engine is cold, sputtering, bogging out especially when travelling uphill, Is this some sort of a sensor maybe??,the spark plugs are new. thanks


check fuel filter. it is starving for fuel. unless the fuel pump is bad. check filter first, then go from there. symtoms of a bad coolant sensor--poor cold idle, stalling, rich mixture retarded timing, slow idle speed, cold hesitation or stumble, poor fuel milage.

Aug 20, 2010 | 2001 Pontiac Grand Prix

1 Answer

The car will pop alittle when you try to start it...It wants to start but wont..replaced the fuel filter,plugs.I have spark to all plugs..I can squirt gas into the intake and it will run but will not idle...


usually when a vehicle backfires, it is caused by the timing or a bad crank sensor. symtoms of a bad coolant sensor are--poor cold idle, stalling, ( rich mixture,retarded timing) slow idle speed, cold hesitation or stumble, and poor fuel milage. check coolant sensor first. good-luck!!

Aug 08, 2010 | 1989 Audi 80

1 Answer

Poor gas milage


Gas milage will vary, depending on the manner in which you drive, also poor gas milage could be due to poor maintenance. Replace the PCV valve, the oxygen sensors, the fuel filter, plugs and wires, and have the injectors cleaned, switch to synthetic oil should improve the milage. .

Jun 29, 2009 | 1991 Toyota Pickup

1 Answer

Lite tapping in engine,very ruff idle,stops when idled up and runs smooth


ruff idle may b idle controll senc. ----tapping may be plugs-- wires, and or gas try 91 oct gas next 3 tanks and see thats the cheeepset place to start

May 28, 2009 | 1998 Ford Explorer

1 Answer

Car shakes at stop signs, very poor gas mileage, and sputters whe


Try having your fuel injector cleaned, you can start with running fuel injector cleaner though your gas tank and if that does not help then you have to get it cleaned out professionally or even worst have the injector's replaced if they are bad.
The other thing that will give it bad fuel would be a bad air intake temperature sensor go bad, as for the ruff idle that is common to a dirty or stuck EGR valve.
Good luck and keep me posted, by the way, what kind of Garage did you take it too? And are there and DTC codes from the ECM?

May 26, 2009 | 2002 Buick Regal

1 Answer

Poor gas milage


Not sure where you live but if the gas you get has a higher amount of ethanol in it you will get worse gas milage.But there are many reasons that effect gas millage.

Nov 24, 2008 | 2004 GMC Canyon

1 Answer

1998 Toyota Corolla poor gas milage


first i would change the fuel filter. this is the number one reason for poor gas milage. the engine tries to compansate for the lack of fuel and in the long run this weakens your fuel pump and it will fail sooner rather than later. i als would check the air filter. if the engine can't breath properly it will lose power. if you have not had a tune up I would suggest getting one. this most certainly help boost the performance of your vehicle. i would try and use an additive in your fuel to clean the injectors clogged injectors will make the engine run rough and cause hard starting and rough idle.. the last thing i would have you check is the throttle positon sensor and the O2 sensor. take it to a shop and have them hook a diagnostic scan tool to it this will show if either of these sensors are bad or if they threw a code and the computer is trying to overcompensate for the lack of fuel. hope these options help you. please rate this solution thanks

Sep 01, 2008 | 1998 Toyota Corolla

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