Question about 2008 Toyota 4Runner

Open Question

1995 Toyota 4runner check engine light 3.0 v6 4x4 manual trans

I recently bought this truck and the check engine light came on but truck seems to be running fine except loss of power up steep hills. I had it scanned and was told to replace the o2 sensor. I did this with a universal but the light came back on. I then replaced it with an OE sensor, but light came back on. I had it scanned again and this time was told there were no codes but my hydrocarbon numbers at idle were very high, going from 400-1200 but they would drop to normal when engine was revved up to higher rpms. Everything else was fine besides that, the o2 sensor and catalytic conv. Iwere working fine. I took it to a mechanic who scanned it and said there was a code for too lean coming up and tested it for a vacuum leak and told me there wasn't one but he said that he adjusted my idle and timing, turned off the light and told me I would be fine. It came back on after about 20 miles of driving. I then took it to another mechanic who told me I also didn't have a vacuum leak and it wasn't misfiring, but the person who owned the truck before me didn't use the right Toyota plug wires when they did a tune up and that if I put the Toyota OE wires on it will clear up the problem. I have already spend over $250 on incorrect diagnoses and don't mind paying the $110 to buy them if it clears up the problem but I am hesitant after already shelling out this much on guesses. Has anyone heard of this causing this problem or any other suggestions for the problem. Thank you for your help

Posted by on

  • David Melrose May 11, 2010

    If it isn't misfiring, then why change the wires? High HC numbers are usually caused by misfiring---caused by an ignition problem, or a fuel mixture that is either too rich or too lean to burn properly. It seems to me in your case that all the plugs are firing (so no detected misfire and no ignition problem), but the mixture in one or more cylinders is too lean to burn at idle (lean code + high HC at idle). This would lead me to believe you have a vacuum leak--- most noticeable at idle. A likely place on this old of vehicle would be a leaky intake manifold gasket. Ask your mechanic how he tested the vacuum and if what I'm saying is a realistic possibility.



6 Suggested Answers

  • 2 Answers

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

a 6ya Mechanic can help you resolve that 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Toyota Guy
  • 42 Answers

SOURCE: 1994 toyota pickup 4wd 22re hesitation and stalling

When the timing chains stretch( and they do!) they can cause the 22re to stumble intermittently. Have trouble starting, misfiring, and even some trouble codes But first check your engine for codes You can do this by jumping TE1 and E1

If you have codes we can go from there.
You should pull your valve cover and check you timing chain tension, it should be very tight and not loose. if it is loose it is most likely time for a new chain and/ or tension and guides. I always replace them as a kit. Keep in mind that if the chain is worn it will get progressively worse until the engine will not run or the chain will wear in to the water galleys behind the water pump on the timing chain cover. sorry man.

Posted on May 04, 2009

  • 14036 Answers

SOURCE: Code 25 for Toyota 3.0 3VZE


Posted on Jul 20, 2009

  • 21 Answers

SOURCE: 2004 Toyota 4Runner, Regarding The VSC TRAC and VSC OFF lights

Check your switches for the VSC, some get bumped on (due to their location) and some get stuck in the "on"position.

Posted on Aug 04, 2009

  • 12744 Answers

SOURCE: O2 Sensor Problem?

yes an o2 sensor can cause those symptoms so can a minor vacuum leak --bad ignition wire -clogging fuel filter --sticking egr valve etc.

Posted on Mar 01, 2010

  • 456 Answers

SOURCE: High HYDROCARBONS on emissions test. I

first thing to do is change the air filter. even if it appears clean, the airflow can be blocked enough to affect the petrol air ratios in the engine which will give high HC readings.
changing the spark plugs can give a cleaner spark, and better ignition, with lower HCs. high HCs could also be caused by traces of oil getting through worn piston rings and valve stem seals and burning in the combustion chamber. there are many oil additives that can help stop this and reduce HC levels as well.
hope these suggestions help

Posted on Aug 28, 2011

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

Can a diagnostic connector on 1995 Toyota 4 runner be jumped over with jumper wire to get check engine codes?

There is probably a way to access codes by using a jumper and causing the engine checklight or an integral led to flash in groups. I can't say which pin or pins need jumping.

I suggest you ask the question of google and click on the youtube video.

Jun 26, 2016 | 1995 Toyota 4Runner

1 Answer

My 95 Toyota 4runner looses power and the check engine light comes on after I first start the engine and it shifts into 2nd.

The check engine light is the cpu telling you that there is a fault in the parameters of the sensors it continually monitors. Have a fault code reading done and replace the faulty sensors

Apr 20, 2013 | 1995 Toyota 4Runner

1 Answer

My toyota 4runner v6 engine seems to be stuck

Check the pulley behind the fan clutch, remove the belts and check for a seized pulley, the fan should spin by hand with the pulley.

Feb 25, 2013 | 1995 Toyota 4Runner

1 Answer

I'm proudly own a 1995 Toyota 4Runner with 3.0L V6 engine, with 149k on it and i want to ask if there's any way to improve MPG, i put correct pressure on tires, clean MAF sensor, altough no...

verify good spark plugs and correct ignition timing. make sure the engine is getting to correct temp (195f) Has the mileage always been this bad? be sure the cam timing is correct.

Aug 30, 2011 | 1995 Toyota 4Runner

1 Answer

How do I reset check engine light on a 1995 toyota 4runner?

Remove the "negative" battery cable for at least one monute then reconnect it. This will reset the system.

The FixYa Team.

Jan 30, 2011 | 1995 Toyota 4Runner

1 Answer

Where is the thermostat in a 1995 toyota 4runner?

1995 Toyota Truck 4 Runner 3.0L EFI 6cyl


Fig. 1: On, 3VZ-E engines the thermostat is located in the waterpump (click over pic for zoom)


Fig. 2: Exploded view thermostat and housing on the 1FZ-FE engine


Fig. 3: Exploded view thermostat and housing on the 2RZ-FE and 3RZ-FE engines


Fig. 4: Exploded view thermostat and housing on the 5VZ-FE engine

Hope helps (remember to rate and comment this answer).

Dec 29, 2010 | 1995 Toyota 4Runner

1 Answer

I'm looking for a vacuum diagram for a 1995 toyota 3.0 4runner 4wd. engine has a miss and nobody seems to be able to find it. it gets bad gas mileage and has almost no power.

You need to take to to a shop that does Toyota work, I would check the fuel pressure, and exhaust back pressure and find out why it has a miss.

May 14, 2010 | 1995 Toyota 4Runner

2 Answers

Rattling comming from the right front of my 95 toyota 4runner

the common problem is a loose shock, check it.

May 21, 2009 | 1995 Toyota 4Runner

1 Answer

Lack of Power

Could be one of many but it may help pinpoint problem area better, if there is any codes.

May 18, 2009 | 1995 Toyota 4Runner

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

1,264 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8826 Answers

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

Answer questions

Manuals & User Guides