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Engine running rough why?

1989 nissan d21 hardbody 2.4L the engine have eight spark plugs i done replace spark plugs, ignition wires, ignition coils and the engine is still running rough what i need to replace now to fix the problem?

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Might be a bad vacuum line, check all vacuum lines for cracks or dry hose and replace as needed

Posted on May 02, 2017

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  • Cars & Trucks Master
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Did you replace the plugs leads one at a time
and not mix up the firing order

is this plug lead layout the same as your engine ?


if the car was running rough before

could be fuel related
or a burnt valve = uneven cylinder compression



engine running rough why? - index-hpsofzl4yoq5ipvgh24ehjib-2-2.png

Posted on Apr 29, 2017

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  • Joe Russell Apr 29, 2017

    yes i replace the plugs leads one at a time but if i did mix up the firing order how do i correct it? what does uneven cylinder compression mean? you ask about is this plug lead layout the same as your engine? did you send me a photo? i didn't see one.

  • magna buff Apr 29, 2017

    firing order layout picture can be seen in first reply
    .....was the cap and rotor ok
    do cylinder compression tests...... if one or more cylinders have a low compression compared to the rest .....engine will run badly

  • Joe Russell Apr 29, 2017

    the plug lead layout look the same as my engine the car was running rough when i got it i thought it need spark plugs, ignition wires, cap and rotor so i replace that, i don't see where the ignition wires that run from the cap to the coils in the picture, do i need to pull the codes on this vehicle? when i remove the mass air flow sensor wire the engine keep on running could it be bad? i will try to do a cylinder compression test, what the psi suppose to be on this engine?

  • magna buff Apr 29, 2017

    replace the MAF
    if its fixes the problem dont worry about the compression test ..i would be happy with anything close to 140 psi or above

  • Joe Russell May 02, 2017

    I replace new spark plugs/wires/and coils the engine was still running rough so I check couple of the new spark plugs by connect it to the plug wire and crank the engine the new plug did not spark so I use a good spare plug and the spare plug spark so I am thinking the new spark plugs are bad causing the engine to run rough are could it cause the engine to run rough? so now the engine want start I spray starting fluid into the throttle body and the engine still want start what I need to do next to fix the problem?

  • magna buff May 02, 2017

    if start you mug gets the motor to run
    there is a fuel pump or fuel pressure delivery problem worth checking the fuel pressure regulator on the injector rail

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Replace the cap and rotor and the fuel filter.

Posted on Apr 29, 2017

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1986 nissan d21 4wd with z24 motor it is not getting any fire.the distirb.is working the injector


i am not sure if it has eight plugs or not but if it has two coils , check coils if they seem okay check the modulators thats hookrd to the back of the coil (coils). I have a 1986 nissan hardbody 4x4 w/z24i engine. Check back with me i might be a little help due to i have had resent problems under the hood of mine and maybe have a part or two you can get.

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No spark from distributor


Replace the cap and center element in the cap. Also, you'll want to check the wiring from the coil to the distributor. Chase it back as: Cap and rotor, wire to the coil, timing unit which ignites the coil from the ECU control point. There could even be an issue with the wiring from the flywheel sensor which sends a signal to ignite the coil.
Being an 89, you should get a check engine light if the sensor on the crank is not receiving a signal. Anything coil-distrubutor-spark plugs should not send a specific code.
Hope this helps

Apr 05, 2011 | 1989 Nissan Hardbody King

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I have a 1989 nissan hardbody d-21 and i can not find the negative side of the coil. im trying to hook up an rpm gauge.


take the plug wire thats going to the distributor turn the truck over and touch it to something thats grounded when its sparks its hot if not its a neg

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