Question about 1997 Nissan Pickup

3 Answers

1997 Nissan pickup XE 2wd 5 speed After warming up, pickup starts to buck (does not backfire) I thought is was misfiring so I did a basic tuneup including plug wires & fuel filter. Did not fix the problem. Took it to a mechanic. The computer code indicated the mass air flow sensor. (This had been replaced in 2003) He replaced it with a new one but problem still existed so he removed it & reinstalled the old one. At this point his best guess was the distributor because he could not reproduce the problem in his shop. Mechanic installed new distributor. Did not fix the problem. I thought it could be a fuel problem so I checked the fuel line. I decided to replace the fuel pump. Did not fix the problem. Took it to a 2nd mechanic. He checked the computer code & it indicated mass air flow sensor. I told him that the 1st mechanic replaced this & it didn't solve the problem. So he looked further & added a ground wire to the existing ground on the mass air flow connector & attached it to the ground terminal on the battery. This only helped for a short time. He suggested replacing the connector, but this isn't an item that is available. When engine is cold/cool, it will start & run fine but once it warms up, it starts bucking & continues to get worse the longer it is driven. I can control this to a degree by keeping the rpm up around 3000 when I am going 50+mph in 4th gear but it still bucks somewhat. If I go down to any lower gear or into 5th gear it bucks like crazy. Help!!

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  • 4wolfman May 23, 2011

    Unplugged maf. Pickup started right up & idled at around 1250 rpm. Did not try to drive it. Using repair manual, I checked what I think is the crank position (angle) sensor. According to the manual, I should have battery voltage at Terminal A with the ignition key on. There was none. I checked for continuity at terminal D with the ignition key off. There was no continuity. Do not know about the fuel injectors.

  • 4wolfman May 23, 2011

    The maf sensor is oem. I will have mechanic check the crank position (angle) sensor & the ecu.

    I will let you know what the outcome is.

    Thanks.

  • 4wolfman May 28, 2011

    Thank you for the response. When I talked to a salvage yard about the connector, they were willing to sell the whole wiring harness, but not just the connector. I have a mechanic looking into getting just the connector. As of yet, I haven't heard back from him. I can let you know if that solves the problem.

    Is there any way to prevent the connectors from losing their connectivity? And if this one has gone bad will the rest follow?

  • 4wolfman Jun 10, 2011

    It turned out to be a short in the wiring from the maf to the pcm. Wire was replaced.

  • 4wolfman Jun 10, 2011

    It turned out to be a short in the wiring from the maf to the pcm. Wire was replaced.

  • 4wolfman Jun 10, 2011

    It turned out to be a short in the wiring from the maf to the pcm. Wire was replaced.
    Thanks for the input.

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Has any one checked the true temperature of your engine the fan might be coming on but at
the wrong temp you could have pre ignition and its firring ahead of time or the mas flow censor
is being restricted check the tubes and make sure they are clear but all and all it sounds to me its out of time electronically the pick up coil the crank censor or even a bad intake manifold gasket
leaking air when the intake heats up and expands allowing a pin hole

i hope this helps you
bob

Posted on May 23, 2011

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It is a common problem with Nissans that the harness and connectors lose their connectivity as they age-replace the harness and connector, worse case you might need to find something in a junkyard or make a connector out of pieces found there-use a ohm meter to check for broken wires, as that seems to be the issue. The reason it runs well when cold is the engine is run off of a set table of adjustments in open loop, when it goes into closed loop it has to get good input from these sensors and your MAF is not doing that-not due to a faulty sensor but because of an electrical problem, and the only solution is to find the fault or just replace the wiring/harness.

Posted on May 23, 2011

  • mike mountain May 29, 2011

    connectors just go bad, due to age, dirt, heat, rough handling...and buying the harness is usually what needs to be done, but just the harness for the connector-not like an entire engine harness-it should only be a few bucks

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Get the crank position sensor also checked by the mechanic.If its shorting then it will also cause bucking. ---------- Check the fuel injectors and spark plugs too.also check that fuel tank is not very low.Also check to run the pick up with out maf sensor.Just see if its getting started or its just dies when you try to start without maf. ---- This should help.Thanks.Helpmech.

Posted on May 22, 2011

  • raj somaiya May 23, 2011

    If there is no continuity and no voltage at terminals on then it can be the crank position (angle) sensor problem.------- The maf sensor is the part which tells your cars computer about how fuel /air mixture ratio to send to engine.But if the maf sensor is new and still Nissan is showing error code related to maf, then the new maf is not compatible with your vehicle, is it OEM product or compatible maf sensor.Try using original Nissan maf sensor.But if your maf sensor is original then this problem is related to faulty computer( ecu).The computer is having problem, so its not detecting new maf and thats why same problem is coming up .-----------
    The actual problem is as follows:---
    The fuel is not going as per required flow to the engine.So this problem is there.---------
    Now why the fuel is not going with proper flow?
    ----- This is because maf sensor is not functioning.----------- why maf sensor is not functioning still its new?--- because the ecu is not detecting maf sensor.-------- so problem is either maf or ecu.------------
    Try with original maf sensor is the first option.But if maf is original sensor, then check the ecu.-------
    Ask you mechanic to test the ecu.---- Also ecu has to be tested by professional mechanic , as it requires proper tol to do it.---- You can get it checked at autozone or any other professional car garage. --- Not ecu scanning but ecu testing is required.----------------
    This will help.Thanks.Helpmech.

  • raj somaiya May 23, 2011

    Yes keep updated with the details.thanks.Helpmech.


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