Spuddering when going from idle to drive

Tiny
350ZRAGTOP
  • MEMBER
  • 2001 NISSAN TRUCK
  • 2.3L
  • 4 CYL
  • 2WD
  • MANUAL
  • 70,000 MILES
My truck has been sitting for a few years. I do drive it around the block every three months or so to get the seals lubed and what not. I recently changed oil and filter and flushed coolant so I am trying to get this street ready and got a moving permit. What I am experiencing is a bit of a shudder when I am stopped and when I go at lights. Not always, but bad enough where I almost stall out. I did take it on the highway today no issues. It was when I came back that it started doing this. My ideas are many on this issue. MAF? Bad gas? Fuel filter plugged? I do not think I have any breathers disconnected I did a good investigation of this. Fuel pump failing maybe?

Also, if this helps I did check all the fuel injectors with the long screwdriver with my ear to the rear of them as the car ran and they all sudden great and consistent with each other. Lastly I went though each plug wire to looks for any burn or damage and they are perfect. Actually they look brand new in my eyes. I seem to be stuck on one or two things fuel filter clogged or has water. The other is the pump not always engaging. It fires up when I turn the key with out the motor on every time so maybe it is not that. MAF seems unlikely. Possible all though!

Any information would be greatly appreciated.
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Friday, May 26th, 2017 AT 12:29 PM

6 Replies

Tiny
HMAC300
  • EXPERT
Are you sure the shuddering is not the clutch plate with oil on it that will cause it. try cleaning throttle plate on both sides and IAC hole with choke cleaner it may be gummy causing it then check fuel pressure with a gauge auto parts rent it although you may need an adapter. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, May 26th, 2017 AT 3:38 PM
Tiny
350ZRAGTOP
  • MEMBER
Yes I did try that and it is clean and now cleaner, because that was my first step now I am on step eight I think. I took apart the distributor and the prongs around the inside of the cap had some minor build up a scraped off and sandpapered lightly. Checked all my plug lines and good continuity for each of the four lengths. The next step is try to replace that fuel filter which is pretty easy for this model truck along the frame next to the tank. I think what is going on is the fuel is rich to one or more cylinders briefly. Part of that maybe clogged fuel line. Well back to the garage thanks for the advise.
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Friday, May 26th, 2017 AT 3:56 PM
Tiny
350ZRAGTOP
  • MEMBER
Sorry I forgot, yes I inspected that rotor also little fire burn on the tip, but nothing major. I cleaned that with sand paper also and blew both parts out with nitro so no particles left over.
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Friday, May 26th, 2017 AT 3:57 PM
Tiny
KEN
  • ADMIN
Hello,

Try a new fuel filter and clean or replace the MAF here are some guide to help you see what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

and

https://www.2carpros.com/articles/mass-air-flow-service

and

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Please let us know what happens.

Cheers, Ken
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Monday, May 29th, 2017 AT 1:28 PM
Tiny
350ZRAGTOP
  • MEMBER
Ken,

Thanks for the reply yes I changed the Fuel filter and it solved my problem with the spudder. Also replaced two evap seals and the purge valve. All were relatively easy jobs. Now I will try the MAF which I have been researching, but I do have good power going to the lead. Engine light back on. Changed the gas cap. Didn't help so back to the evap leak search again I will try to smoke it and see where that leads me!
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Monday, May 29th, 2017 AT 4:29 PM
Tiny
HMAC300
  • EXPERT
If your light is on scan for codes so you know which circuit to try to fix or sensor instead of just changing parts.
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Tuesday, May 30th, 2017 AT 5:19 AM

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