hesitation on hard accel - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

91s13coupe · 07-25-2002, 10:54 PM

the car has done this since i bought it in jan. of this year. i just installed new plugs, cap, rotor, wires and a holly anniahlator digital ignition sytem. it only does when i mash the pedal to the floor and only in the uppper rpm range from say 4500 to 6000 rpm. it just stumbles for a second and the takes off from there. it does not do it from like 3/4 throttle acceleration even when i go into the same rpm range. its an automatic 1991 coupe. i know its not the tranny slipping in case someone was going to suggest that! any ideas???

xhdriver · 07-26-2002, 01:18 AM

replace your fuel filter, if that doesnt work than get a new pump also.

xeroxed · 07-26-2002, 10:48 AM

most 240's have a slight hesitation when mashed to the floor....it seems to accelerate faster about 5/6 of the way down from my experience

hurleyboi514 · 07-26-2002, 11:04 AM

mines the same way, it feels quickest about 5/6 throttle...  ive done a through tune up recently and havent left anything out.  i cant figure it out...

91s13coupe · 07-26-2002, 12:53 PM

actually i have replaced the fuel filter also right after i got the car so its been on there for 6 months. i was thinking that the problem was fuel related. its good to know that im not the only one with this same problem. if anyone figures it out for sure please let me know! thanks for all the input!

xeroxed · 07-26-2002, 08:07 PM

you could try the injectors, but i dont necessarily think this is a problem i've drove many 240's(im in a large 240 car club here in central florida) and every one  of them has done this exact same thing....so i think its kinda just how the car is made if its only a few seconds just dont mash down the pedal next time :-D

phase2 · 07-27-2002, 04:35 AM

Make sure you gap the plugs to the KA specs, I believe is 0.045 or 0.044, or something on that end.

If it's a short stumble, it might be an ignition miss from your holly xxxx?? ignition amplifier.  I would bypass that and run stock ignitor to see if the problem persist to narrow down the possibilities.

91s13coupe · 07-27-2002, 10:03 AM

it doesnt do it off the line.  it did it before i put the holly system on. it its only at about maybe 4500rpm or 5500rpm and it doesnt really cut out it just kinda "hiccups" ,like there is a hole in the fuel map?

07-25-2002, 10:54 PM	#1
91s13coupe Leaky Injector Join Date: Jun 2002 Location: blue springs, mo Age: 52 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	the car has done this since i bought it in jan. of this year. i just installed new plugs, cap, rotor, wires and a holly anniahlator digital ignition sytem. it only does when i mash the pedal to the floor and only in the uppper rpm range from say 4500 to 6000 rpm. it just stumbles for a second and the takes off from there. it does not do it from like 3/4 throttle acceleration even when i go into the same rpm range. its an automatic 1991 coupe. i know its not the tranny slipping in case someone was going to suggest that! any ideas??? __________________ [IMG]http://www.imagestation.com/picture/sraid43/pdff9475e53f1e81e41da0332e76c32e0/fce514e2.jpg[IMG]

07-26-2002, 01:18 AM	#2
xhdriver Zilvia Member Join Date: Jan 2002 Location: 6 Posts: 273 Trader Rating: (0) Feedback Score: 0 reviews	replace your fuel filter, if that doesnt work than get a new pump also. __________________

07-26-2002, 10:48 AM	#3
xeroxed Leaky Injector Join Date: Apr 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	most 240's have a slight hesitation when mashed to the floor....it seems to accelerate faster about 5/6 of the way down from my experience __________________ http://community.webshots.com/album/44481102XTDEdt -89 240sx SE Coupe

07-26-2002, 11:04 AM	#4
hurleyboi514 Zilvia Addict Join Date: Mar 2002 Location: The Fort Posts: 905 Trader Rating: (0) Feedback Score: 0 reviews	mines the same way, it feels quickest about 5/6 throttle...  ive done a through tune up recently and havent left anything out.  i cant figure it out... __________________ HighTach Motorsports

07-26-2002, 12:53 PM	#5
91s13coupe Leaky Injector Join Date: Jun 2002 Location: blue springs, mo Age: 52 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	actually i have replaced the fuel filter also right after i got the car so its been on there for 6 months. i was thinking that the problem was fuel related. its good to know that im not the only one with this same problem. if anyone figures it out for sure please let me know! thanks for all the input! __________________ [IMG]http://www.imagestation.com/picture/sraid43/pdff9475e53f1e81e41da0332e76c32e0/fce514e2.jpg[IMG]

07-26-2002, 08:07 PM	#6
xeroxed Leaky Injector Join Date: Apr 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	you could try the injectors, but i dont necessarily think this is a problem i've drove many 240's(im in a large 240 car club here in central florida) and every one  of them has done this exact same thing....so i think its kinda just how the car is made if its only a few seconds just dont mash down the pedal next time :-D __________________ http://community.webshots.com/album/44481102XTDEdt -89 240sx SE Coupe

07-27-2002, 04:35 AM	#7
phase2 Zilvia.net Advertiser Join Date: Jun 2002 Location: Walnut, CA 91789 Posts: 380 Trader Rating: (3) Feedback Score: 3 reviews	Make sure you gap the plugs to the KA specs, I believe is 0.045 or 0.044, or something on that end. If it's a short stumble, it might be an ignition miss from your holly xxxx?? ignition amplifier.  I would bypass that and run stock ignitor to see if the problem persist to narrow down the possibilities. __________________ 909-594-3619 Business Hours: Mon-Fri 10am-6pm (Pacific) email: [email protected] http://www.phase2motortrend.com

07-27-2002, 10:03 AM	#8
91s13coupe Leaky Injector Join Date: Jun 2002 Location: blue springs, mo Age: 52 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	it doesnt do it off the line.  it did it before i put the holly system on. it its only at about maybe 4500rpm or 5500rpm and it doesnt really cut out it just kinda "hiccups" ,like there is a hole in the fuel map? __________________ [IMG]http://www.imagestation.com/picture/sraid43/pdff9475e53f1e81e41da0332e76c32e0/fce514e2.jpg[IMG]