Location: Vancouver Island, British Columbia, Canada
Posts: 13
91 240sx jerky accelleration up to around 3k RPM?
Hey there everyone. I tried the search function and couldn't find anything on this. Sorry if it's a repeat. Anyways I have a 91 240sx SE Super Hicas with 170k KM on it. I have this slight issue with it. If I just really ease off and let it slowly climb to speed I notice it rev's up a little uneven. It will go up say 300ish rpm fine and then kinda slow down a bit in it's ascension, just for a split second and then go up another 300-400rpm smoothly. It's just berely what you could call jerky but it doesn't feel right. If I gun it it's not as noticeable. No white/black smoke out the car.
It has new NGK Platinum Plugs gapped to .044 (factory). When the car is warm and has been run for a while it isn't as noticeable as well. Generally it's when the car is still cold-ish and I drive off in the morning. I installed a new fuel filter (canadian tire).
Once I'm in second gear and on it's not really noticeable, just really in first gear. Also if I am in first gear and give it some gas and then let go of the pedal quickly it is a little jerky in decelleration and there is some 'bubbling' sound in the exhaust. Nothing loud, just a quiet gurgle sound? Any insight on this would be awsome. I was considering swapping for a better name brand/z32 fuel filter, maybe new plug wires?
Any help would be awsome guys(and gals)!!
Thanks,
Mike
I would suspect your problem might be ignition related. With that many miles on the car, it's recommened to replace the following ignition components:
- Distributor cap and rotor. Buy only OEM from a Nissan dealer.
- Ignition wires. Buy an "NGK Blue" wire set; it's better then OEM.
You're better off to use the standard NGK plugs BKR5E-11 instead of the platinum plugs. I've tried platinum and found the standard plugs work better. Also the 0.044" gap is too large. The proper gap is 0.039 - 0.043".
__________________
KA > SR anyday of the week.
Last edited by rogoman : Apr 25th, 2008 at 03:00 PM.
Location: Vancouver Island, British Columbia, Canada
Posts: 13
Awsome, thanks a lot! I kind of suspected it was something to do with ignition myself, I will definetly try out your suggestions. It is 170 000KM not miles...I don't know if ya got that one. Anyways doesn't matter haha. Thanks!
also the iridiums are a butch of crap. i ran those on an n/a setup not even turboed and they caused my car to stutter (never use iridium plugs for turbo setup). like said before just stick with regular plugs.
Location: Vancouver Island, British Columbia, Canada
Posts: 13
Haha how much you offer? it's not really for sale but maybe for the right price. 240's around here are really popular and worth quite a bit. 6g+ for one in this shape with low k's for a 91. you can see lots for more than 6k on usedvictoria.com or usednanaimo.com usedvancouver.com. that's my area. just got in brand new tie rods inner/outer, all new rotors/pads.
Location: Vancouver Island, British Columbia, Canada
Posts: 13
Yeah Super Hicas comes standard with a nice Viscous Limited Slip Differential, works great. I installed new drilled rotors/slotted pads all around, slightly thicker tie rods inner/outer on both sides (one of the old ones was bent). I'm glad I got it off when I did because as I twisted off the nut with the tie rod in the vice, it snapped!! Good thing it didn't happen on the road haha..
Car is solid now though. New tie rods and 4-wheel alignment made the Hicas a lot more noticeable and functionable I LOVE IT. Thinking about maybe adding some boost to my KA, it's in pretty good shape and pulls strong, only 105k miles. Anyone here have experience building a KA-T?
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