Question about 1995 Toyota 4Runner

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1995 3.0 2WD 4runner SR5 Long Explanation Before problem description: New short block was installed and engine was run (less than 50 miles) when knock sensor code was set and due to illness was parked and never touched/run for about 3 years. Knock sensor code was only issue in the beginning after it sat for 3 years several thing had to be done: replaced fuel pump,strainer ,filter,cleaned and flushed tank and lines, replaced knock sensor (and all necessary parts), replaced 1 injector(cracked plastic end),replaced water pump and thermostat,(cleaned and flushed system). Tuned up (air oil spark plugs etc, and checked and rechecked timing,verified vacumm hose routing and vsv operation on Power Steering and A/C idle-up and EGR and PAIR systems along with Fuel control VSV system, have ran Seafoam through the fuel system (fuel tank) and through the intake vacumm (brake booster inlet). Problem: A skip or lope 90% of the time when started (acts like a vacumm skip)have checked vacumm at idle on ports P E R (supposed to be "0" at idle) and Port P Has a very slight vacumm at idle, Motor smooths out at higher rpms (2000-2500rpm) rough under load (tranny in reverse or drive) Sometimes when it starts it DOES NOT act like this, it runs smooth as silk. No Check engine light or codes that I can find using the DLC1 method. I sprayed carb cleaner at all vacumm points and all connections with engine running to try and find any vacumm leaks- none found Am at my wits end to determine the issue(s)as I have checked everything I can with my limited knowledge and resources Any thing I have not added or You need clarification on please ask.

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  • slowgo1959 Jun 03, 2009

    1995 3.0 2WD 4runner SR5 <<<< 3.0 V6 3VZ?E ENGINE,
    Will post Compression Results in a bit Thanks in Advance

  • slowgo1959 Jun 14, 2009

    To Duane_wine
    Sorry it took me so long to post results of compression test
    This was after running compression test(s) wet and dry.

    I noticed that #4 plug was a blacker that the rest(the others were normal in apperrance) upon checking it has a good spark(equal to the others anyway)
    Is there a way to check the injectors on the vehicle? I cannot check them by testing the electrical leads at injectors (under plenum).

    To: Avid101
    And no I do not have a vaccum gage, but which vaccumm port are you referring to so that when I acquire one I will know which one to check?

  • duane wine May 11, 2010

    sounds like valves to me . run a compresion test and tell me what you find . sounds like a valve is sticking open . witch motor is in it


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Did you do a compression test? and did you do a Vac. text at the Port hole to see if you had a steady needle?

Posted on Jun 04, 2009

  • Bruce Hathcock Jun 17, 2009

    Ok do the following buy a bottle of lucas fuel treatment and add it to a tank of gas, it sounds like the injector or valve is sticking on the plug that is black that will help loosen the valve and some of the carbon, after you do that then go to any GM dealer and go to the parts department and buy a can of GM tp engine cleaner fluid, get a tooth brush and pull the air intake hose off to get to the throttle plate, now dip the tooth brush into the top engine cleaner and clean the throttle plate both sides you will have to hold it open to do the back side of the plate, next clean the port hole that the plate is in especially where the plate sits at rest then clean off with starting fluid or carburetor cleaner. next put intake hose back on. Now you will find a vacuum port on top of the intake it will have a rubber plug on it buy 2 feet of hose that will fit on that port its shaped at a 90 degree angle and points to the back of the engine and is on top of the intake plenum, next with two people get one to start and run the car while you put the hose on the intake tube and put the hose in the gm Top engine cleaner container, start the car it will smoke and will try to die but keep it running til it sucks the entire contents of the top engine cleaner into the engine then shut off the engine and let it sit for 20 minutes, next start the engine and keep it running until it stops smoking then take it for a ten mile test drive and see if this fixes the problem. After sitting for so long the carbon has gotten hard and will cause an intake leak in the valves or the injectors so this will fix that if that is a problem. You will know when you pull the intake hose off and look inside the tube if it's all black and sooty you know that this is the problem. If you need more help post another comment here and I will help you with the next step.


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