Need help won't rev past 4-4500 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Lazy706 · 02-28-2013, 01:50 PM

Ok here's my problem car runs fine when it's cold revs up all the way up, but when it reaches operating temp it wnt rev past 4-4500 and gets worse the longer it runs. After a while it doesn't even want to start what could be wrong?

Lazy706 · 02-28-2013, 02:03 PM

Check ecu no codes, checked tps, checked the cps all tested good. Tried swapping maf made no difference.

traxx07 · 02-28-2013, 02:11 PM

MAF wiring? Maybe unplug maf and see if it does the same thing. (Warms up and doesnt rev past 4500 with maf unplugged.)

Maybe a sticking injector? Do all the basics. Check plugs, injectors, make sure your getting spark, grounds, etc.

Lazy706 · 02-28-2013, 03:34 PM

Yup tried that still same problem. Imma have to try changing plugs n cables but I am getting spark. Any other ideas on wat I shud check?

Lazy706 · 02-28-2013, 04:34 PM

Question is it possible that my fuel pump is going out and gets weaker the longer I run? I know usually it works or it doesn't but i just want to kno if it's possible?

s13panic · 02-28-2013, 05:11 PM

Maybe coolant temp sensor? If its getting an inaccurate reading when hot it can possibly either lean out or richen the a/f mixture. Can also cause no start condition when engines hot.

Lazy706 · 02-28-2013, 06:31 PM

Yea I thought that too so I bought a new coolant sensor and swapped it still had the same problem.

s13panic · 02-28-2013, 06:51 PM

What year and engine is it? KA has 2. One tells gauge what its reading and the other tells ecu what to do.

Lazy706 · 02-28-2013, 07:26 PM

93 and yea I changed the ecu one with 2 pins I believe thats the right one?

Lazy706 · 02-28-2013, 07:32 PM

Srry yea it's ka

s13panic · 02-28-2013, 08:13 PM

Yea thats the ecu one. Gotta be something else.

2.5T_/<ouki · 02-28-2013, 08:20 PM

Quote:

Originally Posted by Lazy706

Question is it possible that my fuel pump is going out and gets weaker the longer I run? I know usually it works or it doesn't but i just want to kno if it's possible?

Was exactly my problem when i did my swap. I was experiencing exactly what you are and once i swapped out my fuel pump all hell was unleashed and my baby boosted like no other.

Lazy706 · 02-28-2013, 09:09 PM

Alright I'll try that nxt I got a pump I can put in at home. I'll let uall know if it changes anything.

PIN GIO 2 · 02-28-2013, 09:34 PM

hey hey hey i think that one happened to me before so luck i found ground wire connect firewall between rear cylinder head was loose bolt then tight bolt also make sure check all ground harness.

Lazy706 · 02-28-2013, 11:45 PM

Thnx I'll try that also

Lazy706 · 03-01-2013, 05:01 PM

Well I swapped fuel pump no difference :/. And I tried looking for that ground wire but couldn't find it maybe because it's a de swap?

Lazy706 · 03-02-2013, 07:47 AM

Swapped out distributor and o2 sensor and so far problem has fixed. Not sure which 1 was my problem but Thanx for yalls help.

02-28-2013, 01:50 PM	#1
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Need help won't rev past 4-4500 Ok here's my problem car runs fine when it's cold revs up all the way up, but when it reaches operating temp it wnt rev past 4-4500 and gets worse the longer it runs. After a while it doesn't even want to start what could be wrong?

02-28-2013, 02:11 PM	#3
traxx07 Nissanaholic! Join Date: Dec 2008 Location: San Antonio, TX Age: 32 Posts: 1,987 Trader Rating: (63) Feedback Score: 63 reviews	MAF wiring? Maybe unplug maf and see if it does the same thing. (Warms up and doesnt rev past 4500 with maf unplugged.) Maybe a sticking injector? Do all the basics. Check plugs, injectors, make sure your getting spark, grounds, etc. __________________

02-28-2013, 05:11 PM	#6
s13panic Leaky Injector Join Date: Jul 2006 Location: northern nj Age: 35 Posts: 118 Trader Rating: (6) Feedback Score: 6 reviews	Maybe coolant temp sensor? If its getting an inaccurate reading when hot it can possibly either lean out or richen the a/f mixture. Can also cause no start condition when engines hot. __________________ CLUSTER BOMB EC DORIFTO

02-28-2013, 06:51 PM	#8
s13panic Leaky Injector Join Date: Jul 2006 Location: northern nj Age: 35 Posts: 118 Trader Rating: (6) Feedback Score: 6 reviews	What year and engine is it? KA has 2. One tells gauge what its reading and the other tells ecu what to do. __________________ CLUSTER BOMB EC DORIFTO

02-28-2013, 08:13 PM	#11
s13panic Leaky Injector Join Date: Jul 2006 Location: northern nj Age: 35 Posts: 118 Trader Rating: (6) Feedback Score: 6 reviews	Yea thats the ecu one. Gotta be something else. __________________ CLUSTER BOMB EC DORIFTO

02-28-2013, 02:03 PM	#2
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Check ecu no codes, checked tps, checked the cps all tested good. Tried swapping maf made no difference.

02-28-2013, 03:34 PM	#4
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Yup tried that still same problem. Imma have to try changing plugs n cables but I am getting spark. Any other ideas on wat I shud check?

02-28-2013, 04:34 PM	#5
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Question is it possible that my fuel pump is going out and gets weaker the longer I run? I know usually it works or it doesn't but i just want to kno if it's possible?

02-28-2013, 06:31 PM	#7
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Yea I thought that too so I bought a new coolant sensor and swapped it still had the same problem.

02-28-2013, 07:26 PM	#9
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	93 and yea I changed the ecu one with 2 pins I believe thats the right one?

02-28-2013, 07:32 PM	#10
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Srry yea it's ka

02-28-2013, 09:09 PM	#13
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Alright I'll try that nxt I got a pump I can put in at home. I'll let uall know if it changes anything.

02-28-2013, 09:34 PM	#14
PIN GIO 2 Zilvia FREAK! Join Date: Sep 2008 Location: Ontario, California Age: 31 Posts: 1,355 Trader Rating: (20) Feedback Score: 20 reviews	hey hey hey i think that one happened to me before so luck i found ground wire connect firewall between rear cylinder head was loose bolt then tight bolt also make sure check all ground harness. __________________

02-28-2013, 11:45 PM	#15
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Thnx I'll try that also

03-01-2013, 05:01 PM	#16
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Well I swapped fuel pump no difference :/. And I tried looking for that ground wire but couldn't find it maybe because it's a de swap?

03-02-2013, 07:47 AM	#17
Lazy706 Leaky Injector Join Date: Aug 2012 Location: Rome, Ga Age: 28 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Swapped out distributor and o2 sensor and so far problem has fixed. Not sure which 1 was my problem but Thanx for yalls help.

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