Power loss !!!, Only when it's HOT outside ...
#21
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One thing that i'm sure about is, It ONLY happens afternoon when it's the highest temperature of the day.
But, What the heat will affect exactly, I mean should i change my engine oil, gear oil or my engine coolant cause they are the ones getting affected?
do i need an oil cooler for example?
I'm really disappointed, Please help ....
But, What the heat will affect exactly, I mean should i change my engine oil, gear oil or my engine coolant cause they are the ones getting affected?
do i need an oil cooler for example?
I'm really disappointed, Please help ....
chill.
#22
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Hi,
I'm really getting sick of this. Every morning i will drive the car & it's accelerating OK, But afternoon when i'm back from work ( The outside temperature is about 120 F ), The car is totally losing power & it does not matter how hard the gas pedal will be pushed, The RPM is hardly going over 3000 RPM !!!
The car is not overheating at all and the temperature gauge is showing that it's OK.
Please help ...
I'm really getting sick of this. Every morning i will drive the car & it's accelerating OK, But afternoon when i'm back from work ( The outside temperature is about 120 F ), The car is totally losing power & it does not matter how hard the gas pedal will be pushed, The RPM is hardly going over 3000 RPM !!!
The car is not overheating at all and the temperature gauge is showing that it's OK.
Please help ...
#23
the hotter the air being sucked in by the intakes, the higher the power loss
You guys are right, but his car is in limp mode, not just down on power.
Despite the heat outside, what would make the car act like that?
Thanks,
#25
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I have a feeling he is NOT going into safemode. I think he is just experiencing what we all do on a day to day basis.
I live in Houston, and it has been HOT lately....well...always. I experience the same as you. In the morning going to work, car responds amazing. In the afternoon, car is sluggish and drives almost totally different.
What others have said is right.....Hence why ambient temp and miles above/below sea level is important factor to drag racers. The car will run quicker in cold, dense air and worse in hot, thin air.
If your temp gauge is reading that low always, however, id consider a stuck open thermostat in which your engine is not being allowed to heat up to proper operating temps.
I live in Houston, and it has been HOT lately....well...always. I experience the same as you. In the morning going to work, car responds amazing. In the afternoon, car is sluggish and drives almost totally different.
What others have said is right.....Hence why ambient temp and miles above/below sea level is important factor to drag racers. The car will run quicker in cold, dense air and worse in hot, thin air.
If your temp gauge is reading that low always, however, id consider a stuck open thermostat in which your engine is not being allowed to heat up to proper operating temps.
#27
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my personal thought on all this is, if the car is cutting out at 3k rpms, and its 120 degrees outside, i wouldnt continue to drive the car. its cutting fuel at 3k? like as if you were hitting rev limiter? if so, you can probably cause permanent damage... you have a decent car, bring it to nissan and get it fixed...
#28
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Limp mode, Candians car was doing the same on hot days. He could drive it to work in the morning , them in the afternoon here in the Vegas summer it would go into limp.
#30
About my performance mods, I have aftermarket headers, test pipes & Greddy EVO II & I have the stock air intake.
#31
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The thermostat is a physical device that blocks the coolant water flow. The ECU has no connection to it and never knows what is going on there. It closes when cool and opens to allow the water to flow once it reaches ~170ºF.
In theory, if stuck open it would take a longer time for your car to heat up. Or if you are in a cold environment, it might never warm up properly.
The fans are controlled by the ECU based on a number of conditions: vehicle speed, coolant temperature, refrigerant pressure and the A/C on/off state. It sounds likek your are working correctly.
Have you ever cleaned or checked your Mass Air Flow sensor (right past the air box)?
In theory, if stuck open it would take a longer time for your car to heat up. Or if you are in a cold environment, it might never warm up properly.
The fans are controlled by the ECU based on a number of conditions: vehicle speed, coolant temperature, refrigerant pressure and the A/C on/off state. It sounds likek your are working correctly.
Have you ever cleaned or checked your Mass Air Flow sensor (right past the air box)?
Last edited by DavesZ#3; 08-06-2010 at 03:30 AM.
#32
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I have a feeling he is NOT going into safemode. I think he is just experiencing what we all do on a day to day basis.
I live in Houston, and it has been HOT lately....well...always. I experience the same as you. In the morning going to work, car responds amazing. In the afternoon, car is sluggish and drives almost totally different.
What others have said is right.....Hence why ambient temp and miles above/below sea level is important factor to drag racers. The car will run quicker in cold, dense air and worse in hot, thin air.
If your temp gauge is reading that low always, however, id consider a stuck open thermostat in which your engine is not being allowed to heat up to proper operating temps.
I live in Houston, and it has been HOT lately....well...always. I experience the same as you. In the morning going to work, car responds amazing. In the afternoon, car is sluggish and drives almost totally different.
What others have said is right.....Hence why ambient temp and miles above/below sea level is important factor to drag racers. The car will run quicker in cold, dense air and worse in hot, thin air.
If your temp gauge is reading that low always, however, id consider a stuck open thermostat in which your engine is not being allowed to heat up to proper operating temps.
Im going to go with this. OP will your rpms go up further than 3k just slowly, or does it act like it hits a rev limiter and WILL NOT go higher. Very important.
#33
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First of all this is normal in this time of the year .... 2nd, the fuel you are using is not 98 in USA count "PON" but rather "RON" which is equal to let say 93 PON.
Also, do you park your car out in the sun when at work? if yes, then the fuel your are using is at best became not that good
Also, do you park your car out in the sun when at work? if yes, then the fuel your are using is at best became not that good
#34
Have you ever cleaned or checked your Mass Air Flow sensor (right past the air box)?
Im going to go with this. OP will your rpms go up further than 3k just slowly, or does it act like it hits a rev limiter and WILL NOT go higher. Very important.
First of all this is normal in this time of the year .... 2nd, the fuel you are using is not 98 in USA count "PON" but rather "RON" which is equal to let say 93 PON.
Also, do you park your car out in the sun when at work? if yes, then the fuel your are using is at best became not that good
Also, do you park your car out in the sun when at work? if yes, then the fuel your are using is at best became not that good
The car is parked for at least 4 hours directly under the heat of the sun. Going inside the car by that time is like going inside a bowl of boiling water .
#35
Here's some update,
So i went to a garage ( they are only working on 350z & infiniti G ), I cleaned the throttle body & MAF sensor. replaced my spark plugs also.
The car is Still acting like before & it's getting worst!!!. The car will accelerate ok once you push it from a stop, The rpm is moving OK & shifting OK, BUT once i will release the gas pedal & try to push it again, i will not be able to get the car to accelerate anymore. At the moment the car is not accelerating i will put it in the manumatic mode. ( The car is A/T ) & i will feel like a Turbo has been started & it's O.K .
I'm Realy worried about my transmisssion, Any ideas will be highly appreciated.
Thanks,
So i went to a garage ( they are only working on 350z & infiniti G ), I cleaned the throttle body & MAF sensor. replaced my spark plugs also.
The car is Still acting like before & it's getting worst!!!. The car will accelerate ok once you push it from a stop, The rpm is moving OK & shifting OK, BUT once i will release the gas pedal & try to push it again, i will not be able to get the car to accelerate anymore. At the moment the car is not accelerating i will put it in the manumatic mode. ( The car is A/T ) & i will feel like a Turbo has been started & it's O.K .
I'm Realy worried about my transmisssion, Any ideas will be highly appreciated.
Thanks,
#40
I will start a car from a stop & it will drive fine till i reduce the speed ( release the gas pedal & the car goes to lower gear ). After that the rpm is hesitating just under the 3000 rpm and not moving above even th speed will go a lil bit high.
In that moment i will push the car to the manumatic mode & it will go fine.
I didn't had a chance to test the manumatic mode in higher gears ( cops are everywhere ), So i cannot tell if it happens in manumatic mode at higher gears or no !
Thanks,