General query about RPM and idle
07-13-2010, 01:08 PM
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General query about RPM and idle
Just curious as to what is normal range for idling currently I move between 700-800 when the car nears 750 I can feel it shudder and vibrate it usually moves back up .... is this normal or should I be concerned.
My other question is general crusing speed what RPM/Gear do you normally cruise at?
My other question is general crusing speed what RPM/Gear do you normally cruise at?
07-13-2010, 01:12 PM
#3
Huge hole is huge
I don't shudder on idle...at least not that bad.
Around town *35mph* I cruise in 4th gear which sets me at around 2750. I usually go about 39 *According to the spedo* and that sets me closer to 3k.
Around town *35mph* I cruise in 4th gear which sets me at around 2750. I usually go about 39 *According to the spedo* and that sets me closer to 3k.
07-13-2010, 02:42 PM
#8
Extraordinary Engineering
Just curious as to what is normal range for idling currently I move between 700-800 when the car nears 750 I can feel it shudder and vibrate it usually moves back up .... is this normal or should I be concerned.
My other question is general crusing speed what RPM/Gear do you normally cruise at?
My other question is general crusing speed what RPM/Gear do you normally cruise at?
Is your A/C on?
6th, 4K
07-13-2010, 03:02 PM
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No measuring either in first gear ready for the light to change or in neutral, No AC though with the AC on it makes very little difference.
07-13-2010, 05:23 PM
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I'm a delivery driver for donatos and i can average 230-250 miles per tank, now at my other job its all highway and i get about 250-280 a tank. I use 4th gear alot for doing my dels.
07-14-2010, 07:20 AM
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and yet I am currently at 75 miles and half a tank.... granted is more city driving but not a lot of lights and im usually in 4th gear in the 3.5 - 4 k RPM range ... what gives I would love to get 230 miles to the tank
07-14-2010, 10:28 AM
#20
rotor brain
I got close to 300 out of a tank on my trip to GA this weekend but when my low fuel light comes on and I fill it up I only put around 14 gallons... 3 gallons of reserve?
07-14-2010, 10:38 AM
#21
Strength/Confidence
75 at half a tank? Geez. I got 245 on my last tank. Maybe you'll get more miles out of your last half if your fuel gauge isn't real accurate? I've noticed with my 8 the first half goes by quicker than the last half.
07-14-2010, 12:49 PM
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It turns out it's a common problem for the car to vibrate a little bit at idle....possible fixes are a grounding kit, new spark plugs, wires, coils, motor mounts,dirty throttle body and MAF sensor...etc. Turning on the AC usually makes it worse.
My problem turned out to be an improperly installed mount, which was touching metal to metal with the bracket.
It makes it difficult to troubleshoot if you don't have a check engine light, kinda gotta throw parts at it.
That's just my experience though.
A "hunting idle" as you are describing it seems more like a dirty MAF or throttle body, which is easy to fix. This car is known for venting oil into the intake. If you pull out your air filter box look into the accordion tube and see if there's oil puddled in there, can cause your throttle body to gum up over time.
Edit: Oh and for cruising if I'm below 45 mph I cruise in 5th gear, above that I go into 6th. Owners manual suggestion.
My problem turned out to be an improperly installed mount, which was touching metal to metal with the bracket.
It makes it difficult to troubleshoot if you don't have a check engine light, kinda gotta throw parts at it.
That's just my experience though.
A "hunting idle" as you are describing it seems more like a dirty MAF or throttle body, which is easy to fix. This car is known for venting oil into the intake. If you pull out your air filter box look into the accordion tube and see if there's oil puddled in there, can cause your throttle body to gum up over time.
Edit: Oh and for cruising if I'm below 45 mph I cruise in 5th gear, above that I go into 6th. Owners manual suggestion.
Last edited by thisisnotahonda; 07-14-2010 at 12:51 PM.
07-14-2010, 04:09 PM
#23
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A "hunting idle" as you are describing it seems more like a dirty MAF or throttle body, which is easy to fix. This car is known for venting oil into the intake. If you pull out your air filter box look into the accordion tube and see if there's oil puddled in there, can cause your throttle body to gum up over time.
Edit: Oh and for cruising if I'm below 45 mph I cruise in 5th gear, above that I go into 6th. Owners manual suggestion.
Edit: Oh and for cruising if I'm below 45 mph I cruise in 5th gear, above that I go into 6th. Owners manual suggestion.
07-15-2010, 01:05 PM
#24
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I had a rough sitting idle that would sit around 1k, then dip down to around 600 then back up.. did it for over a year. i had my plugs, wires, and coils replaced last week and it sits right at like 800 and doesnt miss a beat, a/c has no effect.
07-15-2010, 01:30 PM
#25
The RX-8 is missed
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^no that's kinda of normal. 100% stop and go or short city driving KILLS gas mileage. i used to drive less than 10 miles a day in city driving and i got well under 200 miles a tank, it's was bad. as soon as i moved further away and extended my driving trips, and wasn't idling at red lights, i get 250 or more per tank.