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Old April 30th, 2020, 11:28 AM   #1 (permalink)
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Low RPMs?

So about 4 days ago I had my 2.4L Auto in for my routine inspection. Passed with flying colors. They gave me a check engine light but I cleared that with a ECU reset. But now for some reason when in first gear when I rev up to about 6,000 rpm it automatically drops my RPM all the way down to 3,000 even with full throttle. Maybe I'm just ignorant on whats going on or is there a problem I need to address? If I'm just dumb please be sure to tell me haha
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Old April 30th, 2020, 11:31 AM   #2 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
So about 4 days ago I had my 2.4L Auto in for my routine inspection. Passed with flying colors. They gave me a check engine light but I cleared that with a ECU reset. But now for some reason when in first gear when I rev up to about 6,000 rpm it automatically drops my RPM all the way down to 3,000 even with full throttle. Maybe I'm just ignorant on whats going on or is there a problem I need to address? If I'm just dumb please be sure to tell me haha
I have the stock intake but I just changed out the filter for a KnW one. Could that do it? I'm still learning.
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Old April 30th, 2020, 01:57 PM   #3 (permalink)
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It would have been very useful to have read that code, as that is probably crucial information to what's going on.

Whatever they played with that caused it to throw a code while in their possession is probably the issue. It could be as simple as a loose plug on the mivec solenoid, can position or crank position sensor.


Does it do it in sport tronic mode, or just when in drive? That'll separate some things. Also, I'm giving benefit of the doubt that you know it's not just shifting to the next gear, or skipping a gear.
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Old May 1st, 2020, 07:19 AM   #4 (permalink)
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Originally Posted by Sabertooth^2 View Post
It would have been very useful to have read that code, as that is probably crucial information to what's going on.

Whatever they played with that caused it to throw a code while in their possession is probably the issue. It could be as simple as a loose plug on the mivec solenoid, can position or crank position sensor.


Does it do it in sport tronic mode, or just when in drive? That'll separate some things. Also, I'm giving benefit of the doubt that you know it's not just shifting to the next gear, or skipping a gear.
Yeah you're right. But after a day she seems to beack to Normal. It was unusually cold the other day and she has trouble revving I noticed after a cold start.
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Old May 1st, 2020, 07:26 AM   #5 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by Sabertooth^2 View Post
It would have been very useful to have read that code, as that is probably crucial information to what's going on.

Whatever they played with that caused it to throw a code while in their possession is probably the issue. It could be as simple as a loose plug on the mivec solenoid, can position or crank position sensor.


Does it do it in sport tronic mode, or just when in drive? That'll separate some things. Also, I'm giving benefit of the doubt that you know it's not just shifting to the next gear, or skipping a gear.
Yeah you're right. But after a day she seems to beack to Normal. It was unusually cold the other day and she has trouble revving I noticed after a cold start.
Cold temp outside will make the PCM shut off MIVEC, my car has like no power in the winter time because of this, but that’s fine because I don’t want to break my tires loose
But any other time it’s fine
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Old May 1st, 2020, 12:11 PM   #6 (permalink)
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No, it's cold coolant temperature. The outside sensors aren't used for that.

You could look at what your coolant temperature sensor readings look like, but you'll need an OBD scan tool.
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Old May 1st, 2020, 12:55 PM   #7 (permalink)
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Originally Posted by Sabertooth^2 View Post
No, it's cold coolant temperature. The outside sensors aren't used for that.

You could look at what your coolant temperature sensor readings look like, but you'll need an OBD scan tool.
You’re right
I just meant when it’s cold outside the car turns off MIVEC, because the coolant temp is so low, never happens to me except in winter

I just soldered on a new pigtail and got my ambient temp sensor back inside the bumper area for my A/C system, only the A/C system uses the ambient temp sensor, and there would be another ambient temp sensor if you have the temp reading in the dash clock but mine doesn’t
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Old May 1st, 2020, 04:15 PM   #8 (permalink)
140whp+15.72%= 162hp
 
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That is very interesting because my car seems to love winter and seems to be more responsive when sucking cold air. I dont get snow over here in San Antonio, mind you.
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Old May 1st, 2020, 07:40 PM   #9 (permalink)
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That is very interesting because my car seems to love winter and seems to be more responsive when sucking cold air. I dont get snow over here in San Antonio, mind you.
Colder air is more dense
Requires more fuel tho
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Old May 1st, 2020, 09:05 PM   #10 (permalink)
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Stock, the car will add the fuel. MAF sensors can account for colder alone. Then O2 sensors would also adjust for lean conditions by adding more fuel.

If your MIVEC isn't working in the cold, and your coolant is over 0c, that's very odd. You really shouldn't even consider using the MIVEC range below full coolant temperature even. When my coolant hits 185f, my oil is still only 120f. Oil takes way longer to warm
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Old May 2nd, 2020, 12:27 AM   #11 (permalink)
140whp+15.72%= 162hp
 
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Never notice fuel consumption as i dont drive it as much. As i mentioned before, it's my DD but i drive it as if it were my weekend car due to my job. It's good to know the car protects itself by keeping MIVEC at bay when very cold. Another reason to praise our hidden gem.
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Old May 2nd, 2020, 05:43 AM   #12 (permalink)
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Yeah if it’s cold enough to turn off MIVEC in the winter, you won’t want to be beating on it like that anyway because you’re oil will be cold

I drive mine like a grandma in the winter lol
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Old May 2nd, 2020, 08:20 AM   #13 (permalink)
140whp+15.72%= 162hp
 
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Move dwn over here to Texas and you wont have to worry about it. Then we drag down Saber next. 😂🤣
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Old May 2nd, 2020, 09:10 AM   #14 (permalink)
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Yeah if it’s cold enough to turn off MIVEC in the winter, you won’t want to be beating on it like that anyway because you’re oil will be cold

I drive mine like a grandma in the winter lol
Only when the oil is cold. Once it's warm, drive however you need.


As for winter fuel economy, it's mostly unchanged. Denser air will provide more resistance, as will snow. I gain about 1L/100km from the cold while cruising 50mph, and then have added up to 4L/100km from pushing snow. This is on a car that does 4L/100km at 50mph in the summer. As for the denser intake charge, that'll make more power and get more fuel. But would mean that you'll need less throttle to accelerate. So you'll just not hit the gas as hard instinctively, otherwise you'd be speeding all the time.
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