Overheating at high rpm - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sil8tyhavoc · 04-03-2009, 01:26 PM

basically the car overheats at high rpm. practically new engine. only has 3k on it. its nots leaking, all hoses are clamped and theres no water getting inside the oil. new OEM thermo and new radiator. it drives fine when driven normal. but when i gun it, it overheats. could this be the water pump? im pretty sure i bleed the car right so theres no air in the system. any ideas?

*DALAZ_68* · 04-03-2009, 01:39 PM

sounds like ur leaning out...

sil8tyhavoc · 04-03-2009, 01:48 PM

how so ? plugs ? i checked them. theyre at .039

BTW EVERYONE ITS A SOHC KA

*DALAZ_68* · 04-03-2009, 02:26 PM

u check fuel pressure?

sil8tyhavoc · 04-03-2009, 02:54 PM

fuel pressure seems to be ok.........i also pulled off the pump and checked it the strainer is clogged and put a new fuel filter......

*DALAZ_68* · 04-03-2009, 02:57 PM

and timing...

*ka24e* · 04-03-2009, 02:59 PM

It could be air in the system like you said, or possibly a bad pump, but have you check your fan? Your fan clutch could be acting up and not locking the fan spinning it faster at higher rpm's.

sil8tyhavoc · 04-03-2009, 03:01 PM

checked the timing too...its right on mark......im seriously running out of ideas.....

sil8tyhavoc · 04-03-2009, 03:04 PM

the fan locks up....its pretty much new.....

*ka24e* · 04-03-2009, 03:12 PM

Man I don't know. If your fan works, timing is right, no air in the system, good pump and no leaks the only other thing I can think of is a bad thermostat.
I know you said it was new, but I've had a couple thermostats that just never opened or never closed.
Did you bleed the system with the heater valve open?

fuco8210 · 04-03-2009, 03:19 PM

I say get an aftermarket temp gauge and study it, if you can drive all day normally without it overheating then i would say its bled fine, etc .. If its a stock rad i'd say upgrade.. the koyo is a beast

sil8tyhavoc · 04-03-2009, 03:20 PM

yes....i bleed the entire system with the heater on full blast.....

DJ_Sunrise · 04-03-2009, 03:33 PM

Where is it saying you are overheating? How do you know?

If you mean the little temp gauge on the cluster.. that's probably your problem. Not only the gauge.. but the sensor for the cluster gauge. I've seen my coolant temp gauge swimming, and I mean SWIMMINNNG around.. Yet on my Power FC, there was only a several degree difference in coolant temp. I've replaced 2 with aftermarket sensors.. my old sensor and the two other sensors all rested in different spots of the gauge. Totally unreliable.

If everything is bled right.. my bet is on the sensor and gauge. Replace the sensor, with a genuine OEM NISSAN part... Not aftermarket. They give wierd ass readings... The needle will never be centered where it should be. Hook up an external sensor to verify coolant temp. Most importantly.. buy a nice aftermarket temp sensor. Don't count on the gauge cluster's "gauge" to do anything but be wrong.

-Bart

drkidd22 · 04-03-2009, 06:11 PM

I had similar problem with my KA when I had my 2000 altima. My temp gauge would intermittently rocket up and then shoot right down to normal temp. I though it was electrical problem since my car had been on a fender bender, but turns out that one day traveling to school I decided to gun it and when I downshifted to 3rd BOOOOM! head gasket GONE...DONE...DESTORYED...exploded and that was end of story. Took my head apart and resurface it, replaced head gasket and timing chain and I was like, let me change the thermo while I'm at it, the thing was freaking F***UP took the thermostat out and put a new one in and my misterious gauge issues went away foreever...well untill I totaled my car a year after.

Have you been keeping an eye on the coolant level in the system? if you have to add coolant frecuently then you might have a small leak as well. Good luck

sil8tyhavoc · 04-03-2009, 06:34 PM

i really dont think its the thermo....ive had 3 and two of them were OEM......same thing.....

steve shadows · 04-04-2009, 01:28 AM

Make sure your head gasket was installed properly

DJ_Sunrise · 04-04-2009, 12:36 PM

Quote:

Originally Posted by sil8tyhavoc

i really dont think its the thermo....ive had 3 and two of them were OEM......same thing.....

Get a check up from the neck up and read my post. How do you know your car is over heating. What is indicating to your prefrontal cortex that the engine is overheating?

-Bart

Addicted2Kouki · 04-04-2009, 02:38 AM

make sure you bled it properly.
Ive seen a lot of ppl say they bled it properly and there was still air in their systems.

if its not that then either its your head gasket or water pump

04-03-2009, 01:26 PM	#1
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	Overheating at high rpm basically the car overheats at high rpm. practically new engine. only has 3k on it. its nots leaking, all hoses are clamped and theres no water getting inside the oil. new OEM thermo and new radiator. it drives fine when driven normal. but when i gun it, it overheats. could this be the water pump? im pretty sure i bleed the car right so theres no air in the system. any ideas?

04-03-2009, 01:39 PM	#2
DALAZ_68 not giving a fuck Join Date: Apr 2007 Location: Los angeles Age: 38 Posts: 15,077 Trader Rating: (104) Feedback Score: 104 reviews	sounds like ur leaning out... __________________ LOL 240... whats better than 1? 5 1's ...lol PSN & XBL GT : Wh0pp3r68 CLUB LEXUS : Wh0pp3r

04-03-2009, 02:26 PM	#4
DALAZ_68 not giving a fuck Join Date: Apr 2007 Location: Los angeles Age: 38 Posts: 15,077 Trader Rating: (104) Feedback Score: 104 reviews	u check fuel pressure? __________________ LOL 240... whats better than 1? 5 1's ...lol PSN & XBL GT : Wh0pp3r68 CLUB LEXUS : Wh0pp3r

04-03-2009, 02:57 PM	#6
DALAZ_68 not giving a fuck Join Date: Apr 2007 Location: Los angeles Age: 38 Posts: 15,077 Trader Rating: (104) Feedback Score: 104 reviews	and timing... __________________ LOL 240... whats better than 1? 5 1's ...lol PSN & XBL GT : Wh0pp3r68 CLUB LEXUS : Wh0pp3r

04-04-2009, 01:28 AM	#16
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	Make sure your head gasket was installed properly __________________ Like Me on FaceBook !

04-03-2009, 01:48 PM	#3
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	how so ? plugs ? i checked them. theyre at .039 BTW EVERYONE ITS A SOHC KA

04-03-2009, 02:54 PM	#5
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	fuel pressure seems to be ok.........i also pulled off the pump and checked it the strainer is clogged and put a new fuel filter......

04-03-2009, 02:59 PM	#7
ka24e Join Date: Apr 2009 Location: Missouri Age: 37 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	It could be air in the system like you said, or possibly a bad pump, but have you check your fan? Your fan clutch could be acting up and not locking the fan spinning it faster at higher rpm's.

04-03-2009, 03:01 PM	#8
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	checked the timing too...its right on mark......im seriously running out of ideas.....

04-03-2009, 03:04 PM	#9
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	the fan locks up....its pretty much new.....

04-03-2009, 03:12 PM	#10
ka24e Join Date: Apr 2009 Location: Missouri Age: 37 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	Man I don't know. If your fan works, timing is right, no air in the system, good pump and no leaks the only other thing I can think of is a bad thermostat. I know you said it was new, but I've had a couple thermostats that just never opened or never closed. Did you bleed the system with the heater valve open?

04-03-2009, 03:19 PM	#11
fuco8210 Leaky Injector Join Date: Feb 2008 Location: stl Age: 40 Posts: 139 Trader Rating: (0) Feedback Score: 0 reviews	I say get an aftermarket temp gauge and study it, if you can drive all day normally without it overheating then i would say its bled fine, etc .. If its a stock rad i'd say upgrade.. the koyo is a beast

04-03-2009, 03:20 PM	#12
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	yes....i bleed the entire system with the heater on full blast.....

04-03-2009, 03:33 PM	#13
DJ_Sunrise Zilvia FREAK! Join Date: Feb 2004 Location: NJ Age: 38 Posts: 1,134 Trader Rating: (1) Feedback Score: 1 reviews	Where is it saying you are overheating? How do you know? If you mean the little temp gauge on the cluster.. that's probably your problem. Not only the gauge.. but the sensor for the cluster gauge. I've seen my coolant temp gauge swimming, and I mean SWIMMINNNG around.. Yet on my Power FC, there was only a several degree difference in coolant temp. I've replaced 2 with aftermarket sensors.. my old sensor and the two other sensors all rested in different spots of the gauge. Totally unreliable. If everything is bled right.. my bet is on the sensor and gauge. Replace the sensor, with a genuine OEM NISSAN part... Not aftermarket. They give wierd ass readings... The needle will never be centered where it should be. Hook up an external sensor to verify coolant temp. Most importantly.. buy a nice aftermarket temp sensor. Don't count on the gauge cluster's "gauge" to do anything but be wrong. -Bart

04-03-2009, 06:11 PM	#14
drkidd22 BANNED Join Date: Jun 2007 Location: USA Age: 39 Posts: 146 Trader Rating: (0) Feedback Score: 0 reviews	I had similar problem with my KA when I had my 2000 altima. My temp gauge would intermittently rocket up and then shoot right down to normal temp. I though it was electrical problem since my car had been on a fender bender, but turns out that one day traveling to school I decided to gun it and when I downshifted to 3rd BOOOOM! head gasket GONE...DONE...DESTORYED...exploded and that was end of story. Took my head apart and resurface it, replaced head gasket and timing chain and I was like, let me change the thermo while I'm at it, the thing was freaking F***UP took the thermostat out and put a new one in and my misterious gauge issues went away foreever...well untill I totaled my car a year after. Have you been keeping an eye on the coolant level in the system? if you have to add coolant frecuently then you might have a small leak as well. Good luck

04-03-2009, 06:34 PM	#15
sil8tyhavoc Zilvia Member Join Date: Jul 2005 Location: riverside, ca Age: 40 Posts: 165 Trader Rating: (2) Feedback Score: 2 reviews	i really dont think its the thermo....ive had 3 and two of them were OEM......same thing.....