Question about 2002 Toyota 4Runner

1 Answer

Engine idle? fuel filter or injectors?

I got a 92 4runner 4cyl. Im tryin to find my fuel filter and how to get at it. The engine runs pretty good, except it runs a little rough at idle, like it stumbles a bit... ive done a tune up (plugs, wires, cap/rotor) Im thinking it must be bad injectors or a clogged fuel filter.
Any suggestions?

Posted by on

  • 2 more comments 
  • skyguy309 Nov 28, 2008

    no engine light on, whats the recommended mileage to replace fuel filter? any other things i should do for a tune-up? Engine was rebuilt at 180,000kms, truck now has around 300,000kms. Starts up great, revs to 2000rms till it heats up, then when its at running temperature, it sounds like it misses once in a while, or stumbles a bit. wondering what it is. Ive noticed a decrease in gas mileage over the past 6 months about 50-75kms per tank now. But it may be just the way im driving. I think it is the injectors now, maybe they arent spraying like they should, just drizzling, should i be replacing them or just cleaning them out? And is there a trick to cleaning out injectors, ive never done it.

  • Anonymous Jan 26, 2009

    Ive been trying to get a hold of a can of bg44k, im in canada, so its a little difficult. I listened to the injectors by putting a screwdriver on them, and putting my ear to it. All of them click nicely except for the rear injector #4 i guess. Its gummed up i bet, first one on the fuel rail thats closest to the tank, collects all the **** first. Should i take my truck into a shop and get them to do a on car injector clean? Or is could i just pop off that injector and throw it in some gunk clean stuff for a night?

  • Toyota Ed May 11, 2010

    First, make sure you have the correct spark plugs. Use only the plugs designed for the engine, buy them at a Toyota dealer. "Aftermarket" plugs have been found to reduce mileage, and create driveability problems. Regarding the injectors, I would try to find a can of "BG 44K". Dump a can in, top off the tank and runs the fuel out as soon as you can. I have found that there is NOTHING on the market that cleans injectors like "BG 44-K". Get the right plugs in it and run the BG thru the engine; then get back to me with the results.

  • Toyota Ed May 11, 2010

    Please don't waste your time on the fuel filter. I highly doubt that it is your problem. Clogged fuel filters will cause you problems all of the time, not just at idle. Is the Check Engine light on?



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 90 Answers

Dont bother with the filter, its under your intake I believe, but Im sure its not the problem. yes, only use toyota plugs and wires

Posted on Jan 26, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2001 nissan sentra 1.8L 4cyl. running codes P0105:P1605:P0171:P0325... engine idles fine when in park just not in gear, in gear it shakes pretty bad, also hesitates to accelerate when you press on gas...

code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

Sep 21, 2013 | Cars & Trucks

2 Answers

Audi 1999 a4 runs rough idles up and down

I think the fuel has gone bad. it's cloging the injector ports. Try this first remove all fuel from the tank, replace the fuel filter. add 5 gallons of fuel and one bottle of fuel treatment. Run the engine for an hour
this will allow all of varnish from the bad fuel to disolve and clean the injectors. Don't be suprised
if this doesn't totally elimnate the problem chances are the plugs are fouled and need to be replaced also. Good luck
Hope this helps
Please leave feedback

Nov 29, 2009 | 1999 Audi A4

2 Answers

1987 chevy engine problem

you have to reset base idle see manual at library for procedure

Jul 19, 2009 | 1987 Chevrolet S-10 Pickup

1 Answer

Tacoma 4cyl idles rough, heditates, multiple misfires

Possible fuel delivery problem, fuel pump, fuel line, clogged fuel filter, leaking injectors or injector O-rings, faulty pressure regulator etc. Check your fuel pressure.

Jun 20, 2009 | 1998 Toyota Tacoma

1 Answer

I have a 99 accord that lacks power when I hit a hill. It runs fine and gets good mileage but I have to downshift from 5th to 4th on minor hills. Check engine light is off.

howdy, there are a few things on your 99 Accord that could cause that problem. usually all will eventually turn on the check engine light in time. make sure your check engine light is working when the key is first turned to run.

* a partially clogged catalytic converter.
* faulty O2 Sensor (Bank 1 Sensor1).
* low fuel pressure caused by a bad fuel pump, clogged fuel filter(in the tank) or a bad fuel pressure regulator on the injector rail.
*bad ignition switch which can cause intermittent stalls.

now i don't know which engine you have, (i'm guessing a 4cyl.) there were two 2.3L- 4cyl. engines (F23A1 & F23A4) and a 3.0 V6. but if you also have a rough idle or low idle miss, a jumped timing belt can also causing loss of power.

if you know anyone with a scanner that reads the computer datastream, see what the O2 Sensor (Bank 1 Sensor1) is doing & look at fuel trim readings. Also check backpressure on the converter where that O2 Sensor is screwed in.

please let me know if i have helped, totally confused or scared you to death! Good Luck!

Jun 17, 2009 | 1999 Honda Accord

1 Answer

Runs & idles rough has no power when cold gets better when warm

Spluttering and missing is usually one of two things Fuel or spark ?
Fuel problems will be traced to 1/ in line fuel filters .. 2/ tank run low on petrol throwing dirt and grit into tank filter ( if Fitted ) and blocked or restricted injectors a good fuel additve sometimes cures that problem , but replacement is a far better option .
Poor spark plugs breaking down under preassure oiled plugs due to overfilling or incorrect fuel mixtures .. poor or cracked distributor caps dirty or damaged rotor arms in said cap .. leaking HT leads damaged by rubbing and contact with hot engine causing sparks to fly to nearest earth disrupting the spark and ignition timing ... hope this helps Regards vortash

May 11, 2009 | 1999 Kia Sportage

1 Answer

88 toyota pickup v6 wont stay running

Early Toyota fuel injection use a cold start injector, it only works when the engine is cold. It is located in the intake manifold. for the mean time you can turn up your idle by turning a flat head screw in your intake manifold counter clock wise . It could be a coolant temp switch for the injector that has gone bad also.

Mar 26, 2009 | 1985 Toyota Pickup

1 Answer

Engine still missing


If your fuel filter was considerably blocked with debris, sand of foreign material, then it is highly possible that your fuel pump would also require looking over (check/replace). In most instances, there is a strainer (a filter of sort) incorporated into the pump. Should you decide to do this, it may also help if you add "fuel injector cleaner" to your tank so as to clean the other fuel lines.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 26, 2008 | 1991 Daihatsu Charade

Not finding what you are looking for?
2002 Toyota 4Runner Logo

Related Topics:

342 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

81285 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides