Question about 2000 Toyota Tacoma PreRunner

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Just replaced MAF sensor with full tune up, but now idles rough..

Sprayed throttle body with appropriate cleaner, added fuel injector cleaner, replaced plugs, wires & coils. New air filter, and O2 air/fuel sensor. 86,500 miles 3.4 liter V6/Auto.

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Earl,
The check engine light came on when we first started it but went off. Then it would come on and blink off and on then it went off and stayed off. We replaced all plugs and wires, we replaced the head gaskets, and the intake gaskets. When we replaced the 3 new fuel injectiors. Under the manifold. I think they were 2-4&6 injectors.

Posted on Aug 07, 2015

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  • Toyota Master
  • 450 Answers

Replace the IAC, idle air control valve at throttle body. replace fuel fiter, put drygas in tank, todays fuel w/ethenol is bad news for older vehicles.

Posted on Jan 03, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: rough idle

check you throttle position sensor first then fuel pressure regulator, then fuel pump. i have a 92 and had to recently do a massive overhaul. my rough idle was caused by a malfunctioning tps with a small exaust leak causing it to race and an intake manifold gasket. also check your idle speed adjustment settings.

Posted on Dec 03, 2008

Big Poppa Ma
  • 302 Answers

SOURCE: Check engine light on

There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Posted on Dec 07, 2008

MNfisherman
  • 11896 Answers

SOURCE: 2001 toyota celica vaccum leak, po171 keeps comingon

problem is most likely your purge canister itself.

Posted on Apr 15, 2009

co7196
  • 3433 Answers

SOURCE: 1991 toyota 3L V6 Overfueling, raw fuel pouring out exhaust pipes

The valve cover gasket change is related only to the extent of needeing to remove something else . There is the fuel pressure regulator and the MAF SENSOR talks to the ECU telling the computer how much fuel is needed for proper mixture of thre air passing into the intake. It is the first sensor in the intake duct coming out of the sir filter. Make sure all the injectors are secure in wiring connection and look around for any other that had to be removed. All plugs mean it isn't just one injector. Unplug and replug the MAF. cHECK THE THROTTLE POSITIO SENSOT. iT RIGHT THERE where the fuel likage is attached.

Posted on Jun 02, 2009

  • 15 Answers

SOURCE: 22RE no power. 240K on body Rebuilt motor w/ 1k on it.

check to see if plug wires are cracked or burnt threw from laying on exhaust manifold

Posted on Jul 13, 2009

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You can get special MAF spray cleaner at your local auto parts store.
As I recall, the sensor is located between the air fliter and the throttle body.
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1 Answer

Engine idles rough. Engine shuts off while coming to a complete stop unless revving engine


Rough Idle covers several symptoms. Do you mean Idle (RPM) goes up and down or do you mean it is too low and car tries to stall? Idle is dependent on fuel delivery and spark Depending on your mileage and driving style it is more likely an Idle Air Control valve, Mass Airflow Sensor or Throttle body. I would purchase CRC MAF Cleaner and CRC Throttle Body cleaner. you will need to disconnect the induction hose from the air filter and throttle body. On the Taurus/Sable the air filter is loated on driver side under hood. Trace back from it and mid way youwill find a plastic cylinder that is wired in with a plug. Unplug the MAF. Make sure and notate which side is facing the engine as the air flow has to be the right way. I put a dot on the side that should face inward to remember the flow direction. Find a ventilated area and take the CRC MAF cleaner and spray the inside of the Mass airflow from about an inch away. Be careful there are very fine wires inside that can be broken by the nozzle by touching or being too close when spraying. Spray liberally and then set aside to dry. Continuing up the intake you will find the throttle body whihc is a cirucular intake that is metalic It has a butterfly valve inside. Use the same CRC brand but this time us CRC Throttle body cleaner. DONT USE CARB CLEANER OR OTHER BRAND. Ford coats their Throttle bodies with teflon and any other brand can eat this lining away. Clean in short bursts. You can gently take a clean shop rag to wipe inside with your finger as sprayed to dislodge some of the dirt, but be gentle. Dont use stiff brushes.. A qtip, a soft bristle tooth brush with very light pressure. as well. Clean it very well. Place rag underneath to catch any run off. After its cleaned and teh MAF is cleaned, replace the air filter and reassemble the unit. The car will be hard to start at first. Turn it over a few times and it will start. It will sputter a bit and then should run better. Start with MAF and Throttle body first. then move to plugs..Finally, the MAF and Throttle body should be cleaned every other oil change.

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1 Answer

What would cause my car to idle rough?


Rough Idle covers several symptoms. Do you mean Idle (RPM) goes up and down or do you mean it is too low and car tries to stall? Idle is dependent on fuel delivery and spark Depending on your mileage and driving style it is more likely an Idle Air Control valve, Mass Airflow Sensor or Throttle body. I would purchase CRC MAF Cleaner and CRC Throttle Body cleaner. you will need to disconnect the induction hose from the air filter and throttle body. On the Taurus/Sable the air filter is loated on driver side under hood. Trace back from it and mid way youwill find a plastic cylinder that is wired in with a plug. Unplug the MAF. Make sure and notate which side is facing the engine as the air flow has to be the right way. I put a dot on the side that should face inward to remember the flow direction. Find a ventilated area and take the CRC MAF cleaner and spray the inside of the Mass airflow from about an inch away. Be careful there are very fine wires inside that can be broken by the nozzle by touching or being too close when spraying. Spray liberally and then set aside to dry. Continuing up the intake you will find the throttle body whihc is a cirucular intake that is metalic It has a butterfly valve inside. Use the same CRC brand but this time us CRC Throttle body cleaner. DONT USE CARB CLEANER OR OTHER BRAND. Ford coats their Throttle bodies with teflon and any other brand can eat this lining away. Clean in short bursts. You can gently take a clean shop rag to wipe inside with your finger as sprayed to dislodge some of the dirt, but be gentle. Dont use stiff brushes.. A qtip, a soft bristle tooth brush with very light pressure. as well. Clean it very well. Place rag underneath to catch any run off. After its cleaned and teh MAF is cleaned, replace the air filter and reassemble the unit. The car will be hard to start at first. Turn it over a few times and it will start. It will sputter a bit and then should run better. Start with MAF and Throttle body first. then move to plugs..Finally, the MAF and Throttle body should be cleaned every other oil change.

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1 Answer

When i press accelerator engine is cutting ....


The van may just need a good tune up.

  • Replace the fuel filter
  • Replace the air filter
  • Replace the PVC valve
  • Replace Engine oil and filter
  • Replace the Spark plugs
  • Clean out the Throttle body with throttle body cleaner
  • Clean out the MAF sensor
This should help you get your van running 100% soon. If your on a tight budget, start with Cleaning the throttle body with spraying throttle body cleaner into the throttle body and cleaning up the MAF sensor with MAF sensor cleaner, just follow the instruction on the can. Then replace the PVC valve and add fuel injector cleaner in to the gas tank. This should help your engine running better and then you can do the rest of the work to complete the tune up. Good luck and keep me posted. If you go to Auto Zone, you can get all the things you need and they can scan your van for any DTC codes that may also indicate what issues your engine has.

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