Over heating problem please help

[90_240sxx]

hey guys before you say search i did and it didn't help much. I still cant find the problem and before i give up and take it to a shop i thought ill try here first. So i got an s13 w/an s14 sr20. I got a 2 inch aluminum rad w/2 10 inch fans and a new water pump. I all ready checked for leaks and didn't find any and i have bleed the system. Also i checked if the water was running good and it is checked for smoke to see if it was the head gasket and nothing. If my boost/vac gauge is at 0 when idleing and around -12 when cruising at any speed could that cause my overheating issue. If so what can i do to fix it. oh and i all ready took the thermo out because i thought that it would be the problem thanks for any help given

[hpmachine]

Are you sure it's overheating? What gauge are you using? If it's the cluster gauge maybe try an aftermarket one to double check. If it is overheating, I doubt it has anything to do with your vacuum. When you say your boost gauge reads -12 while cruising, is that under light acceleration or off the gas completely? And I think the engine should be pulling vacuum while idling. Not reading zero. Does the car build boost ok? Any other problems?

[90_240sxx]

no its not the gauge it those get hot boiling hot in fact. the car builds up boost just find and the boost/vac gauge reads -12 while cruising under lightacceleration. my air/fuel gauge reads dead lean when the car gets warm i thought it was because my fuel rail had a kink on it but i just change it and it didn't make a difference so i think its my 02 censer. oh and i don't see white smoke at all i even had my brother in law stand in back of the car while i revved up to like 6 grad or so and nothing. im pissed that i cant figure it out im even running with the heater on on full blast and it still gets hot and im tiered of sweating my balls of its very hot here in az to begin with. Need more Help Please

[hpmachine]

does your a/f gauge read dead lean even while driving? If it's running way lean all the time, that could cause it to overheat. I think when a o2 sensor goes bad, it causes the car to run rich.

[IanS]

hey guys before you say search i did and it didn't help much. I still cant find the problem and before i give up and take it to a shop i thought ill try here first. So i got an s13 w/an s14 sr20. I got a 2 inch aluminum rad w/2 10 inch fans and a new water pump. I all ready checked for leaks and didn't find any and i have bleed the system. Also i checked if the water was running good and it is checked for smoke to see if it was the head gasket and nothing. If my boost/vac gauge is at 0 when idleing and around -12 when cruising at any speed could that cause my overheating issue. If so what can i do to fix it. oh and i all ready took the thermo out because i thought that it would be the problem thanks for any help given

you should be at around 20 inchs hg vacuum at idle, if you are at zero you have an issue, either the gauge is hooked up improperly or it is failing, at cruising speed I am seeing between 10 to 15 in hg and off throttle in gear I am between 25 and 30. Also, are you using the stock water temp gauge, when I first did my swap it read all the way hot even though the engine was running properly, I discovered that the gauge sender that was on my motor didnt put out the right signal for the stock gauge, try putting the gauge sender from your stock motor onto the new one.

[90_240sxx]

does your a/f gauge read dead lean even while driving? If it's running way lean all the time, that could cause it to overheat. I think when a o2 sensor goes bad, it causes the car to run rich.

when i first start the car the gauge reads optimal but close to lean then as the car worms up the needle goes down all the way down to lean and it stays there

[90_240sxx]

you should be at around 20 inchs hg vacuum at idle, if you are at zero you have an issue, either the gauge is hooked up improperly or it is failing, at cruising speed I am seeing between 10 to 15 in hg and off throttle in gear I am between 25 and 30. Also, are you using the stock water temp gauge, when I first did my swap it read all the way hot even though the engine was running properly, I discovered that the gauge sender that was on my motor didnt put out the right signal for the stock gauge, try putting the gauge sender from your stock motor onto the new one.

at cruising speed I am around -12 or -14 and off throttle in gear it goes back to 0. it only creates vac when im in throttle and yes it does make boost as well when i step on it . and no its not the gauge the water does get hot boiling hot.

[doridori23]

at cruising speed I am around -12 or -14 and off throttle in gear it goes back to 0. it only creates vac when im in throttle and yes it does make boost as well when i step on it . and no its not the gauge the water does get hot boiling hot.

First off you have vacuum leaks and that is why your reading 0 at idle. Get that fixed.

Secondly get a thermostat! Running with no thermostat can be just as damaging to you engine internals as overheating all the time. To put it mildly your heating the piss out of the engine then dipping it in a lake of cold water (eventually) and doing that over and over can cause a number of catastrophic failures that will render your 240 useless.

As stated before running lean will cause you to overheat. When you run lean you run hot, very very hot. This is the third thing you need to fix or risk blowing the motor.

What do you use to control the fans? Manual switch or adj thermostat?

[90_240sxx]

i had or i should say i have a flex a lite adjustable thermostat but i thought that that would be the problem so im running the fans on a acc power so as soon i turn the key on the fans kick on and stay on. and is there any way that i can test the 02 censer to see if its bad to see if thats why im running lean because i got a 255l fuel pump so its not that

[hpmachine]

this might helphttp://forums.nicoclub.com/zerothread?id=190023

[90_240sxx]

this might helphttp://forums.nicoclub.com/zerothread?id=190023

thanks but i cant use it since there talking about a ka24 ecu and my s14 sr dont got a nob or lights in the back of it. but i think you were right if the 02 censor goes bad i think it does make it run rich because my old ka had a bad connection on the 02 and it made it run rich. oooh i got an idea im gonna disconnect the 02 censor and see if it runs rich if it does it might stop the over heating since it wont be running lean any more. but if it does work that means i got some fuel issue that i got to take care of

[90_240sxx]

ok so i disconnected my o2 censor to see if it will run rich on gas since im running lean and i guess thats why im overheating. but i don't see black smoke coming from exhaust and its still over heating. i bought a 255L fuel pump on ebay but in case if it was fraud and they send me a regular fuel pump would a stock fuel pump make the sr20 run that lean that it would cause it to over heat. i thought a oem ka24 fuel pump could handle a stock sr20. Can anyone help please