Question about 1992 Toyota 4Runner

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CAN NOT GO OVER 3800 RPM WITH 1992 4RUNNER

HAVE REPALCED MASS AIR FLOW METER. REPLACED COMPUTER, STILL NOTHING OVER 3800 RPM FROM ENGINE SPEED

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  • yadayada
    yadayada May 11, 2010

    have u tested and verified the fuel pressure is ok under a load? have u had the exhaust checked for a possible restriction in the catalytic converter?.

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Check your fuel filter I know it seems kind of basic. But if the fuel filter is clogged or bad it will not let your car go over a certain RPM or MPH. Just a suggestion hope it works

Posted on Feb 13, 2009

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Posted on Jan 02, 2017

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It starts but as soon as it's put into gear acts like it wants to go but quits.


Could be a few things. But here are the obvious. Check for a vacuum leak around the intake. When you put the car into drive it starts putting strain on the engine, a vacuum leak will give it too much oxygen and cause a fuel mixture issue / reading.
If nothing wrong there, you may have a bad throttle position sensor. When you put the car into drive and it starts putting strain on the engine it will pull the idle down then the sensor will adjust it automatically. Hope this helps.

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02 Monte Carlo SS 3800 SERIESII V6, no mods. Replaced MAP, IAC, TPS, ECM, Air Filter, Ignition module. No codes! Engine wants to idle from 1500 to 2300 rpm. If I am cruising at 1800 rpm and take my foot...


Sounds like a faulty mass air flow sensor.Try spraying the small thin wires with a nono-chlronated brake cleaner then let it dry for 10-15 minutes then re-install.Make sure to reset the computer whether you clean it or replace it with a new one.

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I would like to ask you about a problem I dont get on my own. When the engine is running in 2 000 rpm the motor is changing in rpm constantly! (higher and lower, higher and lower) I have replaced the air...


I suppose its possible both mass air flow sensors were bad but to have failed the same way is not that likely, the part that came to mind on this one would be A throttle position sensor (TPS) located at throttle body (butterfly) and is reostat which tells computer the psition of butterfly opening. when these go out in a specific spot, they will cause speed or rpm fluctuations at bad spot.

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Change plugs check wires for correct connection. Check pcv for vacuumn leaks. Starter fluid on mass air flow meter may damage it.

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Check the fuel pressure,also change the fuel filter.check the crankshaft sensor,or replace.It sounds more like the tps sensor(throttle position sensor).It is mounted in line with the throttle axle,on the throttle horn.Of course .with out being there and checking I am just guessing.But map sensor or mass air flow sensor could also cause this.Have you checked the air filter?This will cause the problem,if it is stopped up restricting air flow to engine and mass air flow.,map sensor,and vacuums needed to run the car.If I can help,let me know.

Sep 23, 2009 | 1988 Oldsmobile Delta 88

1 Answer

My vehicle just shuts off while im diving, it pulled codes p0453


They might be refering to the MAP Sensor. A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.
Contents How the MAP value is used The manifold absolute pressure measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. (See stoichiometric.) The mass of air is proportional to the air density, which is proportional to the absolute pressure and inversely proportional to the absolute temperature. (See ideal gas law.) Engine speed determines the frequency, or rate, at which air mass is leaving the intake manifold and entering the cylinders.
(Engine Mass Airflow Rate) ˜ RPM × (Air Density) or equivalently (Engine Mass Airflow Rate) ˜ RPM × MAP / (absolute temperature) They could also be refering to the fuel pressure sensor. If so, then yes this also can cause the problem. You shoud have your fuel pressure checked for about $34.00. If you have a bad fuel pressure regulator you will need to change it out. If it remains undelt with then it could take out your fuel pump. Most fuel pumps are located and installed in the top of your fuel tank and are submerged into your tank. It needs the fuel to keep it cool, but if you continually keep your fuel under 1/4 of a tank you will drastically reduce the life of your fuel pump. Fuel pumps can be expensive to replace. I replaced my wifes in her 1997 Chevy Blazer and it cost me $350.00 (lifetime warrenty). If you keep your gas under a 1/4 of a tank most of the time and your pump is found to b bad then you need to opt for the LIFETIME replacement pump. You only want to have to pay for the pump once, believe me. Otherwise you really haven't provided enough of the symptoms to go on. Does it shut off when you are at speed, or stall when at a stop? If it stalls when you come to a stop you could have bad Oxygen sensor(s). If it's the oxygen sensor(s) then you should replace all of them.

These are merely suggestions.
Good Luck!

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My car will only rev to 2500 rpm in drive or in


bad mass air flow meter replace it also check for a ecm update at the dealership goes by vin pretty common problem

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1 Answer

Engine light on, bad fuel milage


You didn't mention if you replaced the mass air flow sensor, if the tech got that code, it needs replacing, if you haven't alresdy done so.

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