rpm gauge wont go over 4k - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

blu2fourty · 12-11-2005, 12:29 PM

when i rev my car on neutral above 4k the rpm gauge will stay at 4k and the needle will act like 4k was redline. on every gear also. never happen before. if i'm flooring and i hit over 4k the car doesnt run smooth like its struggling. if i'm not flooring it hard over 4k the car runs pretty good.

the car is a s14 with a redtop sr. i think a part of the problem could be i'm still on a stock fuel pump(got to double check if its stock) but i don't see how that would effect the rpm gauge.

any help would be nice.

thanks,
jon

S14-vietusmc · 12-31-2005, 05:40 PM

yeah, i got the same problem with the ka motor. never happened til now. i can hear the engine revving about 4k, but the gauge doesnt read about 4k. any help or suggestions? thanks. happy new years too

smithers584 · 12-31-2005, 10:57 PM

you are ridiculous to run a sr20det with a stock ka fuel pump. just asking for problems. upgrade to the walbaro, its only a 100 bucks and easy to do yourself, even if it doesnt fix your problem. could be a boost leak for the sr guy. dont look at the gauge as the problem, its reading what your ENGINE is doing.

smithers584 · 12-31-2005, 11:01 PM

does your engine rev over 4? from your post it sounds like it doesnt, in which case you are either losing spark or fuel or a boost leak, probably fuel since you have the stock pump but it could also be electrical. i had a similar problem with my audi a4, i replaced the alternator and everything was fine, i also swapped in a optima battery before i changed my alternator and that helped. run a multi meter across your battery terminals w/o the car running. should read around 12vdc. then stay on it and have someone start the car and watch the voltage, make sure it doesnt drop to low, if so, your battery will be bad, but that has nothing to do with your prob. after you start the car check the same thing and you should read 14.4 or so, that will tell you if your alternator is good. if it only reads 12 then your alternator is bad and you cant provide enough spark because the voltage will change under different loads.

andrewmp6 · 12-31-2005, 11:24 PM

smither with a higher flow pump upi wanna run a fuel pressure regilator if it wont rev over 4k sound like the maf is bad or not wired right sure the tach isnt fucked up

smithers584 · 12-31-2005, 11:40 PM

i dont really understand your post andrew (about the pump and regulator) cuz i ran the stock regulator for a long time. since he isnt sure about the pump that probably means that he bought the car with the sr, so it probably is wired right or else the car would have acted up the when he bought and he probably would never have bought it. its hard to say without knowing more, it could be fuel pump, alternator, ecu, ignitor chip, coil packs, a bad ground on the coil pack harness, a boost leak, etc......... but your right the tach isnt messed up.

projectRDM · 01-01-2006, 01:33 AM

MAF.

The search function does work if you actually bother using it.

S14-vietusmc · 01-01-2006, 02:58 PM

i did search, thats how i found this thread. see how i posted 20 days later?

i can hear my engine rev about 4k but the gauge isnt registering over 4k. ill will check all things listed on here. thanks for the help.

krazyskata13 · 01-02-2006, 01:10 AM

Quote:

Originally Posted by S14-vietusmc

i did search, thats how i found this thread. see how i posted 20 days later?

owned

BoNyG515 · 01-02-2006, 01:20 AM

ive had the same problem and I found out my MAF connector was half way on haha...only cuz dat little clip came off

12-11-2005, 12:29 PM	#1
blu2fourty Zilvia Member Join Date: Jul 2005 Location: toronto Posts: 203 Trader Rating: (2) Feedback Score: 2 reviews	rpm gauge wont go over 4k when i rev my car on neutral above 4k the rpm gauge will stay at 4k and the needle will act like 4k was redline. on every gear also. never happen before. if i'm flooring and i hit over 4k the car doesnt run smooth like its struggling. if i'm not flooring it hard over 4k the car runs pretty good. the car is a s14 with a redtop sr. i think a part of the problem could be i'm still on a stock fuel pump(got to double check if its stock) but i don't see how that would effect the rpm gauge. any help would be nice. thanks, jon

01-01-2006, 01:33 AM	#7
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	MAF. The search function does work if you actually bother using it. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

01-02-2006, 01:20 AM	#10
BoNyG515 Leaky Injector Join Date: May 2004 Location: San Francisco Age: 40 Posts: 106 Trader Rating: (0) Feedback Score: 0 reviews	ive had the same problem and I found out my MAF connector was half way on haha...only cuz dat little clip came off __________________ "Sugar we're going down swinging..."

12-31-2005, 05:40 PM	#2
S14-vietusmc Zilvia Member Join Date: Jan 2004 Location: WILMINGTON, NC Posts: 237 Trader Rating: (0) Feedback Score: 0 reviews	yeah, i got the same problem with the ka motor. never happened til now. i can hear the engine revving about 4k, but the gauge doesnt read about 4k. any help or suggestions? thanks. happy new years too

12-31-2005, 10:57 PM	#3
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	you are ridiculous to run a sr20det with a stock ka fuel pump. just asking for problems. upgrade to the walbaro, its only a 100 bucks and easy to do yourself, even if it doesnt fix your problem. could be a boost leak for the sr guy. dont look at the gauge as the problem, its reading what your ENGINE is doing.

12-31-2005, 11:01 PM	#4
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	does your engine rev over 4? from your post it sounds like it doesnt, in which case you are either losing spark or fuel or a boost leak, probably fuel since you have the stock pump but it could also be electrical. i had a similar problem with my audi a4, i replaced the alternator and everything was fine, i also swapped in a optima battery before i changed my alternator and that helped. run a multi meter across your battery terminals w/o the car running. should read around 12vdc. then stay on it and have someone start the car and watch the voltage, make sure it doesnt drop to low, if so, your battery will be bad, but that has nothing to do with your prob. after you start the car check the same thing and you should read 14.4 or so, that will tell you if your alternator is good. if it only reads 12 then your alternator is bad and you cant provide enough spark because the voltage will change under different loads.

12-31-2005, 11:24 PM	#5
andrewmp6 Zilvia Junkie Join Date: Nov 2005 Location: kentucky Posts: 376 Trader Rating: (0) Feedback Score: 0 reviews	smither with a higher flow pump upi wanna run a fuel pressure regilator if it wont rev over 4k sound like the maf is bad or not wired right sure the tach isnt fucked up

12-31-2005, 11:40 PM	#6
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	i dont really understand your post andrew (about the pump and regulator) cuz i ran the stock regulator for a long time. since he isnt sure about the pump that probably means that he bought the car with the sr, so it probably is wired right or else the car would have acted up the when he bought and he probably would never have bought it. its hard to say without knowing more, it could be fuel pump, alternator, ecu, ignitor chip, coil packs, a bad ground on the coil pack harness, a boost leak, etc......... but your right the tach isnt messed up.

01-01-2006, 02:58 PM	#8
S14-vietusmc Zilvia Member Join Date: Jan 2004 Location: WILMINGTON, NC Posts: 237 Trader Rating: (0) Feedback Score: 0 reviews	i did search, thats how i found this thread. see how i posted 20 days later? i can hear my engine rev about 4k but the gauge isnt registering over 4k. ill will check all things listed on here. thanks for the help.