1984 Nissan 300zx non turbo jumpy and lagging acceleration


Asked by Mar 29, 2015 at 03:21 PM about the 1984 Nissan 300ZX 2 Dr STD

Question type: Maintenance & Repair

I recently got a 300zx non turbo model. Im having an issue with the acceleration in the
vehicle. When I put my foot on the gas it accelerates no problem, but when I'm going a
constant speed with my foot on the pedal it tend the jump around a bit. It will gain
slight acceleration without changing the pedal position and then drop back to where it
was previously.
I have already replaced my fuel filter and my pump has been tested and is in 100%
working order. There are also no holes in the exhaust the may hinder performance,

Any ideas of what could be causing this?

8 Answers

Check the led code window on ecm it self that will save you a lot of time. These cars have similar problems, but trying to fix them online can turn out bad.


Well, I took a look at the ecm, but it doesnt appear to have an led window on it. Any other ideas?

Xenonzcar/FSM has a zipped file that contains all factory service repairs and trouble shooting.

Its free and there are several 300zx pages on Fb DO YOUR HOME WORK BEFORE ASKING A QUESTION, OR BRING YOUR FIRE SUIT.


Well I did my research, I just always prefer a second opinion on things. Thanks for the help though!

Was just trying to look out there are some real trolls on the fb pages is what I was saying


Ah i get ya. Well thank you. You actually did help alot!


If you need the pdf I can send it to you. Had the same problem with mine it ended up being a broken wire on the fuel pump relay. It was getting voltage but the correct amount. Its green located on passenger side behind the battery

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