burning too much gas. how to fix?

jaycas
55

Asked by jaycas Jun 16, 2013 at 10:45 AM

Question type: Maintenance & Repair

My 1991 toyota camry is burning too much gas. At first it was missing so I replaced the 4 spark plugs and distributor cap and wires, now it isn't missing and has power but it gives me about 8miles per gallon! I really need a solution

16 Answers

dandyoun
78,445

How long since air filter replaced?

judge_roy
Not Active

If it's still got a vacuum advance mechanism would suspect it's lack of influence on performance~

1 out of 1 people think this is helpful.
dandyoun
78,445

Double check to in sure all plug wires are in correct order. I would also check timing. With age of your vehicle could be about time for timing chain/belt replacement.

1 out of 1 people think this is helpful.
judge_roy
Not Active

you might just verify that the timing belt is in the correct position and the tensioner isn't too worn to affect performance~

1 out of 1 people think this is helpful.
dandyoun
78,445

http://autorepair.about.com/library/firing_orders/bl-fo-9549.htm

jaycas
55

definatly not the timing. was recently replaced and set correctly. both fuel filter and air filter was replaced 2 months ago.

1 out of 1 people think this is helpful.
jaycas
55

thanks for the link but it is firing correctly. can anyone tell me anything bout a sensor called mass air flow sensor?

1 out of 1 people think this is helpful.
judge_roy
Not Active

the MAF is partially responsible for telling what to do with the EGR (exhaust gas recirculation) valve-

Best Answer
judge_roy
Not Active

A mass air flow sensor is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each piston stroke. (See stoichiometry and ideal gas law.)

2 out of 2 people think this is helpful.
jaycas
55

should that be replaced?

1 out of 1 people think this is helpful.
judge_roy
Not Active

there's more...from WIKI. There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's electronic control unit can determine the mass flowrate of intake air. Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings. When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. Also see MAP sensor.

1 out of 1 people think this is helpful.
judge_roy
Not Active

You must get your diagnostic information from the car's memory~ any autoparts store will do this for free or you could buy your own OBD-II scanner...that would tell you whether or not to replace this delicate instrument...if it were clobbered with oil, carbon would simply spray it clean with bra-kleen and let it dry~

1 out of 1 people think this is helpful.
judge_roy
Not Active

the EGR is a devlish little device which introduces exhaust gasses back into the intake...on deceleration and intentionally if the combustion temperatures are too hot~ when malfunctioning can really play hell on performance as well~...of course your OBD-II diagnostics would tell us should we fix it or leave it alone~

1 out of 1 people think this is helpful.
jaycas
55

okay. thanks

2 out of 2 people think this is helpful.
nosmo
1,805

the MAF is partially responsible for telling what to do with the EGR

1 out of 1 people think this is helpful.
pedro810
0

I have the same problem with my 1991 toyota camry 4 cyl. please if you find the problem please share it thank you.

Your Answer

Add photo

Related Questions

  • Burning Engine Oil 16 answers

    I have a toyota corolla 2001 and its burning oil. There is no oil leakage as such but i have to put 1L every 1500-1800 Kms. Went to a mechanic, he told the oil seal(packing) around oil pan needs to be...

    2001 Toyota Corolla

    -

    Maintenance & Repair

  • 2000 Solara - oil burning 2 answers

    I see white smoke coming out of the tailpipe when I first start my car. I also can smell oil burning while driving. What's the problem and is it worth fixing?

    2000 Toyota Camry Solara SE V6 Coupe

    -

    Maintenance & Repair

  • My 2002 Camry SE burns and excessive amout of oil 46 answers

    For abt the last 30k miles my Camry has been increasingly burning oil. It also has a slight hesitation when taking of, so usually first gear and then fifth gear is I am going slightly slow. I went to ...

    2002 Toyota Camry SE

    -

    Maintenance & Repair

  • Why is 2010 Toyota Camry burning oil at 65,000 miles? 10 answers

    My well cared for 2010 Toyota Camry 4 cyl. has had synthetic oil changed every 5,000 miles at dealership as recommended. Last week my oil light came on. I was 2 qts down at the dealer today and they c...

    2010 Toyota Camry Base

    -

    Maintenance & Repair

  • pontiac firebird not burning gas 16 answers

    ive replaced the spark plugs and the rotor for the distributor and for some reason the engine does alot of shaking and makes knocking sounds and does not burn the gas the way it should be burned. th...

    1992 Pontiac Firebird Base

    -

    Maintenance & Repair

Toyota
Looking for a Used Toyota in your area?
CarGurus has 328,561 nationwide Toyota listings starting at $999.
ZIP:

Search Toyota Questions

Toyota Experts

#1 Tom Demyan
Tom Demyan
Reputation 13,010
#2 FordNut
FordNut
Reputation 11,080
#3 tenspeed
tenspeed
Reputation 6,680
View All