Question about 1991 Nissan Pickup

1 Answer

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

Posted by on

  • 1 more comment 
  • 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 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



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • 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.


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.


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


    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.

  • FUBAR Mar 20, 2011

    OK ,great!
    Hope it works out for you.



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

Idles rough 1991 Nissan truck

Tune up, EGR valve dirty, collant temp sensor bad, IAC dirty.

Feb 23, 2015 | 1991 Nissan Pickup

1 Answer

Engine sputters when accelerating

timing is off a little turn distributer a hair if it gets worse go the other way maybe injector cleaner in gas tank

Aug 15, 2013 | 1991 Nissan Maxima

1 Answer

Repair manual for 1991 4x4 nissan hard body pickup

Yeah Joe,Nissan's are well known for head gaskets to blow.Here's a link to replace head gasket.

Feb 10, 2013 | 1991 Nissan Pickup

2 Answers

I have a 1991 nissan pickup. The engine started getting hot, as i was driving it lost power and eventually shut off. I didnt see any water leaking so I checked the oil and antifreeze was in the oil. Now it...

I would really be concerned about the antifreeze in oil, sounds like head gasket at least or head, block problem, even if you dont see antifreeze leaking, the engine can burn it and exit through tail pipe-white smoke or steam (beyond just cold start-up)

Jan 28, 2011 | 1991 Nissan Pickup

1 Answer

89 nissan z24 pickup idles fine bute smokes very badly under acceleration bluish white color does note knock or tap

valve seals are gone over time with high mileage..check oil and make sure antifreeze is not mixing then it would be head gasket..

Mar 14, 2010 | Nissan Pickup Cars & Trucks

1 Answer

85 nissan pickup runs rough at idle

you may have a carbon buildup problem in the egr system, i would check this and the hoses for leaks first

Sep 10, 2009 | 1985 Nissan Pickup

1 Answer


I hate to be the barer of bad news, but may be the head gasket.

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

May 17, 2009 | 2002 Nissan Sentra

1 Answer

Clicking noise when accelerating

It's hard to diagnose with just the small information you have stated, but it 'sounds' like it's that Exhaust Gas Recirculation Valve gasket.

In your cylinder head is a runner that brings exhaust gas up through the intake manifold.
The EGR valve is attached to the intake manifold, and the sensory part of the EGR valve sits down in the pathway of the runner.

A bad EGR valve gasket will let exhaust gasses escape, making the sound you described.

Apr 20, 2009 | Dodge Neon Cars & Trucks

1 Answer

Engine starts,reaches high rpm,then slowly returns to a rough idle, misses badly,no backfire,surges as if searching/adjusting air/ fuel/est,timing light shows mark constantly changing/erratic,engine then...

Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

Apr 18, 2009 | 1991 Chevrolet Camaro

Not finding what you are looking for?
1991 Nissan Pickup Logo

Related Topics:

80 people viewed this question

Ask a Question

Usually answered in minutes!

Top Nissan Experts


Level 3 Expert

81400 Answers

Phil Lovisek
Phil Lovisek

Level 3 Expert

726 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

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

Answer questions

Manuals & User Guides