Question about 1991 Nissan Pickup

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Replaced timing components and head gasket plus 2 exhaus valves 1991 nissan pickup,starts but idles rough and wont accelerate sounds like timing retarded but double checked cam and dist timing seems to be correct, no misfire.I am a master cert ase but little experience with this vehicle

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  • mikenorman07 Mar 20, 2011

    2.4 vin y cannot find vin y with my diag sys,used diagram vin f and h seemed to be correct but vague on 12 oclock position of cam knock pin,12 oclock to world or to slant of engine installed in truck,have tried cam timing 3 diff positions no help,cam sprocket is pinned to cam and ok,manually finding top center of 1 piston,kinda need to know about butterfly valves in intake manifold,problem seemed to get better when vac applied to diaphram controlling this system.what does this do?

  • mikenorman07 Mar 20, 2011

    had internet problems last night dont know if you received my last email so will send again.Firstly thanks for new info diagram is better than one i got thru identifix.svc info very interesting,history on vehicle,it came to me after recent timing chain job at other shop.cam bolt and sprocket was laying in timing cover apparently not tightened but in process bent 2 ex valves.Supposedly vehicle ran ok up to that point.would like fuel press specs and dist timing info that i cannot find.You are getting me closer, I will double check cam timing with new diagram but I am fairly certain that is where i hav it.

  • mikenorman07 Mar 20, 2011

    thanks,will recheck everything mon let u know if still hav problem

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  • Master
  • 1,168 Answers

Hi Mike.

A problem like this one is frustrating isn't it?
Been there too.

First thing that I thought of when I read your issue was.. "Did a cam gear slip on the cam?"


You working on the 2.4 or the 3.0 liter?
What are you using for a manual?
Can I send you a different diagram?
Let me know. In the meantime I'll try to think of some other possibilities.

KL

Posted on Mar 20, 2011

  • 1 more comment 
  • FUBAR Mar 20, 2011

    OK Mike, as long as the pin hasn't broken and shifted. That happened to me and rove me crazy until I found it..

    What was the reason for the repair? Just the burned valves?

    Here's a diagram from All Data.




    Here is a description of the variable air induction.

    The swirl control valve (SCV), located in the intake manifold passage, partially closes off the
    intake passage of each cylinder at idle, restricting air flow. This
    causes the velocity of the intake mixture to increase, promoting the
    vaporization of the mixture. This increase in velocity makes the fuel
    mixture burn faster, increasing fuel economy and engine stability.

    During all other operating conditions the SCV opens allowing the intake
    flow to encounter less resistance, improving power and acceleration. The
    ECU supplies the ground circuit to the SCV solenoid, cutting the vacuum
    source to the SCV. This allows the SCV passage to open, thereby
    allowing non-restrictive air flow.

  • FUBAR Mar 20, 2011

    Good afternoon Mike.

    Ignition timing 10 degrees +/- 2 degrees.
    There is a service bulletin on timing. It may relate to your issue.
    Here is the procedure, but you may need a Nissan scanner (consult) to make it easier.

















    1.Connect CONSULT. If the vehicle you are working with is not CONSULT
    compatible, connect a tachometer (digital readout if possible).
    2.Start the engine (the accelerator may have to be opened and/or the
    fuel pump fuse removed during cranking to get the engine to start), and
    warm it to operating temperature.


    Note :

    If the engine will not start after performing the above procedure, clean and dry the spark plugs, and attempt to start the engine again.





















    3.Run the engine at 2000 rpm (no load) for two minutes. Then shut the engine off.
    4.Check the oil level and correct if necessary (between the "L" and
    "H" marks on the dipstick). If the oil level is overfull and has a
    gasoline odor, change the oil and filter before performing this
    procedure. If the crankcase is overfull with oil, idle speed adjustment may be affected.
    5.Disconnect the throttle position sensor (TPS) connector. Now re-start the engine.


    Note :

    When the engine is in this condition (TPS disconnected), the IACV-AAC valve and the ignition timing are held in a "fixed" position, and the idle sped
    is called "base idle." If the engine stalls with the TPS disconnected,
    the base idle speed is adjusted too low. Temporarily increase the base
    idle speed by turning the adjusting screw on the IACV-AAC valve until
    the engine will idle.














    6.Rev the engine 2-3 times to 2000-3000 rpm, then allow it to idle (all accessories "off").
    7.Check the ignition timing with a timing light and adjust it to specification (if necessary).













    8.If the vehicle is not CONSULT compatible, monitor the idle speed using the tachometer connected in step 1. If using CONSULT, perform the following procedure:
    Monitor the idle speed (CMPS^RPM) on the CONSULT screen.

    9.Check the idle rpm and adjust to specification (if necessary) using the screw on the IACV-AAC valve.


    10.

    Turn the engine off, and re-connect the TPS.



    FUEL PRESSURE

    At idle:






















    More than 226 kPa (2.3 kg/cm2, 33 psi) [1]

    Approximately 294 kPa (3.0 kg/cm2, 43 psi) [2]


    [1] When fuel pressure regulator valve vacuum hose is connected.

    [2] When fuel pressure regulator valve vacuum is disconnected.

    There is some info for you.
    Let me know if you need some more.
    KL


  • FUBAR Mar 20, 2011

    OK ,great!
    Hope it works out for you.
    KL

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