RX7Club.com


Go Back   RX7Club.com > Generation Specific > 2nd Generation Specific (1986-1992)
Sign in using an external account
Register Forgot Password?
Register Photos FAQ Members Search Today's Posts Mark Forums Read VendorsUsed Cars TSB & Recalls Garage
Welcome to RX7Club.com

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 10-17-06, 10:06 PM   #1
I beckon the thaw~
 
gbaki's Avatar
 
Trader Score: (0)

Join Date: Sep 2006
Location: New York
Posts: 262
My car revs high on start up...

Cant figure it out. When I start the vehicle, it revs out of control at about 3 to 4000 rpms. After about maybe 30 to 40 seconds it returns to normal. why is it doing this. Cant be an air leak, because filter was recently change. Im not really sure. If you guys could help me out, Id trully appreciate.. Thanks..
gbaki is offline   Reply With Quote
Old 10-17-06, 10:16 PM   #2
Drift FC
10 Year Member
 
CyborgRyu's Avatar
 
Trader Score: (8)

Join Date: Nov 2003
Location: Cincinnati, OH
Posts: 1,606
normal, cold start assist warm up. you can make it not do that by leaving it in 1st gear when you start the car. then after 30 seconds, put it in neutral
CyborgRyu is offline   Reply With Quote
Old 10-17-06, 10:30 PM   #3
I knw wht u did last sumr
 
Soma's Avatar
 
Trader Score: (0)

Join Date: May 2006
Location: AZ
Posts: 356
Yeah, that cant be good on your seals in cold climates...
prolong the life of your engine and leave it in gear when you start it up!
Soma is offline   Reply With Quote
Old 10-17-06, 10:35 PM   #4
Insane Burnout
 
Boostmaniac's Avatar
 
Trader Score: (0)

Join Date: Mar 2006
Location: Louisville, Ky
Posts: 675
Yeah, or a little throttle blip clears mine right up.

You can get a few things to remove it though, Rtek being the foremost at the front of my mind.
Boostmaniac is offline   Reply With Quote
Old 10-17-06, 10:37 PM   #5
75LIDE7
 
playdeadva's Avatar
 
Trader Score: (0)

Join Date: Oct 2005
Location: va beach, va
Posts: 373
Send a message via AIM to playdeadva
+1 i get chills up my spine when i hear my car aggressivly shoot to 3k when i can still see my breath. leave it in gear for start up ftw
playdeadva is offline   Reply With Quote
Old 10-17-06, 10:57 PM   #6
<3Convertable Love<3
 
Gallardo's Eggroll Shop's Avatar
 
Trader Score: (0)

Join Date: Aug 2005
Location: Cherry Hill, New Jersey
Posts: 73
Send a message via AIM to Gallardo's Eggroll Shop
it's ok to start the car while its in 1st gear? from personal experience... the car jolts foward and it is really bad to start it in 1st gear... so i would just like it clearified? do u like hold the clutch in put it into gear and leave ur foot on the clutch while u start the car? is that how u do it cause im really confused.
Gallardo's Eggroll Shop is offline   Reply With Quote
Old 10-17-06, 11:08 PM   #7
7th Heaven
5 Year Member
 
slpin's Avatar
 
Trader Score: (9)

Join Date: Nov 2004
Location: California
Posts: 3,653
i really dont think it is all that bad... alot of unmodified FC lasts a long time even with that system, yer knoe....
slpin is offline   Reply With Quote
Old 10-17-06, 11:14 PM   #8
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by Gallardo's Eggroll Shop
it's ok to start the car while its in 1st gear? from personal experience... the car jolts foward and it is really bad to start it in 1st gear... so i would just like it clearified? do u like hold the clutch in put it into gear and leave ur foot on the clutch while u start the car? is that how u do it cause im really confused.
... yes, clutch IN, otherwise youll bump your way up the driveway
FCKing1995 is offline   Reply With Quote
Old 10-17-06, 11:16 PM   #9
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by slpin
i really dont think it is all that bad... alot of unmodified FC lasts a long time even with that system, yer knoe....
anytime you rev the engine cold with no oil pressure built its a bad thing, wether or not the engine fails isnt the issue. it IS bad for any engine
FCKing1995 is offline   Reply With Quote
Old 10-17-06, 11:24 PM   #10
7th Heaven
5 Year Member
 
slpin's Avatar
 
Trader Score: (9)

Join Date: Nov 2004
Location: California
Posts: 3,653
it builds oil pressure when you crank.
maybe thats why it takes 3 cranks before it starts up
build up just enough oil pressure
slpin is offline   Reply With Quote
Old 10-17-06, 11:26 PM   #11
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by slpin
it builds oil pressure when you crank.
maybe thats why it takes 3 cranks before it starts up
build up just enough oil pressure
it does build oil pressure after you crank it, but it takes a little time for the oil to circulate through the entire engine. especially if the car has sat over night, its all run back to the oil pan by then
FCKing1995 is offline   Reply With Quote
Old 10-17-06, 11:36 PM   #12
7th Heaven
5 Year Member
 
slpin's Avatar
 
Trader Score: (9)

Join Date: Nov 2004
Location: California
Posts: 3,653
there will still be oil in the bearings.
it will be fine

most high mileage motor doesnt show any copper

i hate how everyone makes the 3000rpm warm up sound like the destruction of motor, but when pretty much all the motors that let go, around here or not, are due to overheating or apex seals going.
slpin is offline   Reply With Quote
Old 10-17-06, 11:38 PM   #13
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by slpin
there will still be oil in the bearings.
it will be fine

most high mileage motor doesnt show any copper

i hate how everyone makes the 3000rpm warm up sound like the destruction of motor, but when pretty much all the motors that let go, around here or not, are due to overheating or apex seals going.
that might be so, but bottom line is, 1200rpm warmup is better than 3000rpm any day of the week. better safe than sorry. ive never in my life hopped into my car one cold morning and cranked it up then rev it to 3000rpm to warm it up.
FCKing1995 is offline   Reply With Quote
Old 10-18-06, 12:08 AM   #14
I am the stig.
 
Twofer's Avatar
 
Trader Score: (0)

Join Date: Aug 2005
Location: San Diego, CA
Posts: 605
Send a message via AIM to Twofer Send a message via Yahoo to Twofer
You can disable the AWS by unplugging the sensor on the driver's side of the radiator, near the bottom. You should be able to see it clearly from the bottom, with the underbody pannel removed.

(Not to be confused with the coolant level sender at the top of the radiator.)

My car starts, revs to 3k, then down to 1.5k high idle.
Twofer is offline   Reply With Quote
Old 10-18-06, 12:25 AM   #15
<3Convertable Love<3
 
Gallardo's Eggroll Shop's Avatar
 
Trader Score: (0)

Join Date: Aug 2005
Location: Cherry Hill, New Jersey
Posts: 73
Send a message via AIM to Gallardo's Eggroll Shop
yeah same with my car. it revs to 3k then idles at 1500 till warm... which isnt that bad. as for the cold start system. isnt it bad to run a rotary while cold? and thats y the cold start system is there to heat up the engine? just checking...
Gallardo's Eggroll Shop is offline   Reply With Quote
Old 10-18-06, 12:29 AM   #16
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by Gallardo's Eggroll Shop
yeah same with my car. it revs to 3k then idles at 1500 till warm... which isnt that bad. as for the cold start system. isnt it bad to run a rotary while cold? and thats y the cold start system is there to heat up the engine? just checking...
its there to get the cat up to temp faster
FCKing1995 is offline   Reply With Quote
Old 10-18-06, 12:37 AM   #17
<3Convertable Love<3
 
Gallardo's Eggroll Shop's Avatar
 
Trader Score: (0)

Join Date: Aug 2005
Location: Cherry Hill, New Jersey
Posts: 73
Send a message via AIM to Gallardo's Eggroll Shop
yeah forgot about that detail. well if you stop the cold start from starting. is that a bad for the cats?
Gallardo's Eggroll Shop is offline   Reply With Quote
Old 10-18-06, 01:02 AM   #18
Rotary Slave
 
FCKing1995's Avatar
 
Trader Score: (3)

Join Date: Jul 2005
Location: Birmingham, Alabama
Posts: 1,599
Send a message via AIM to FCKing1995
Quote:
Originally Posted by Gallardo's Eggroll Shop
yeah forgot about that detail. well if you stop the cold start from starting. is that a bad for the cats?
perhaps, i wouldnt know because i live in alabama and we dont have emission control here So they are gone as soon as I get the cash for an exhaust system
FCKing1995 is offline   Reply With Quote
Old 10-18-06, 09:55 AM   #19
Insane Burnout
 
Trader Score: (0)

Join Date: Oct 2006
Location: wisconsin
Posts: 516
Its a no brainer to not rev and engine that high on start up. There just isnt sufficiant oil where it needs to be at that point. It still takes a few seconds to circulate through all the passages and bearings. The little residual amount that is left around the bearings is not enough for a high rev start. Synthetic (mobile 1) will help this due to better filming, but you have to disconect your oil injection and run premix fuel. When ever I start my race car I prime the oil pump first, most racers do on higly modified engines. I dont see why everyone even argues this. its just not a good idea. Save the engine a bit more, and leave her in first...nuf seid.
bean13 is offline   Reply With Quote
Old 10-18-06, 10:01 AM   #20
Caliente
5 Year Member
 
lchaidez's Avatar
 
Trader Score: (4)

Join Date: Apr 2006
Location: Los Angeles, CA
Posts: 400
Send a message via AIM to lchaidez
I put mine in reverse before i start. Sometimes i think its good that its a cold start assist. But like you mentioned it probably isnt so healthy on the seals. Besides, i let my car warm up anyways, dont need to have the car screaming at 3-4rpm every morning ^^" it'll wake everybody up teeheehee...
__________________

"I feel rather... ravenous... dont you?"
lchaidez is offline   Reply With Quote
Old 10-25-06, 11:32 AM   #21
No Sleep, No Food
 
Trader Score: (0)

Join Date: Feb 2001
Location: n
Posts: 26,674
It should not be going over 3kRPM on the cold start.
To keep it from doing that, either start the car in ANY gear (yes, clutch in) or just blip the throttle when it the RPM's start to climb.


-Ted
RETed is offline   Reply With Quote
Old 10-25-06, 01:19 PM   #22
TANSTAFL
10 Year Member
 
alexdimen's Avatar
 
Trader Score: (5)

Join Date: Oct 2003
Location: Richmond, Va.
Posts: 3,068
alex.dimen.1
Send a message via AIM to alexdimen
alright, first of all: this is why everyone says "read the FAQ!!!"

Quote:
Originally Posted by Gallardo's Eggroll Shop
it's ok to start the car while its in 1st gear? from personal experience... the car jolts foward and it is really bad to start it in 1st gear... so i would just like it clearified? do u like hold the clutch in put it into gear and leave ur foot on the clutch while u start the car? is that how u do it cause im really confused.
even if your clutch switch is screwed, you can't possibly start the car in first with the clutch engaged, so what do you think?

Quote:
Originally Posted by Gallardo's Eggroll Shop
yeah same with my car. it revs to 3k then idles at 1500 till warm... which isnt that bad. as for the cold start system. isnt it bad to run a rotary while cold? and thats y the cold start system is there to heat up the engine? just checking...
it makes no difference that it's a rotary. it's just that the bearing surfaces are relatively "dry" and it would be better to have lower amounts of friction until warm oil flows in there.

as far as cats, disabling aws will not hurt them... they just won't be at sufficient temperature to catalyze for a bit longer.
alexdimen is offline   Reply With Quote
Old 10-26-06, 04:41 PM   #23
Balance is key..
5 Year Member
 
50/50's Avatar
 
Trader Score: (0)

Join Date: Sep 2006
Location: USA, New York
Posts: 24
Are you guys seriosly saying that it's normal for his car to be at 3k at start up? Am I hearing this right? This is what I got from this thread... Somebody please clarify. Im pretty sure theres gotta be something wrong with a sensor thats causing this. I just can't believe that this is normal and putting it in first gear or the other ideas I've read here is the only way to stop this..
50/50 is offline   Reply With Quote
Old 10-26-06, 04:59 PM   #24
90 rx7 convertable
5 Year Member
 
rotorymanincraig's Avatar
 
Trader Score: (0)

Join Date: Oct 2006
Location: Minot ND
Posts: 119
I just blip my throttle and it drops down to 1500rpm. Do the turbo models rev that high when cold? That would be bad for a turbo to spin up with cold oil.
rotorymanincraig is offline   Reply With Quote
Old 10-26-06, 05:01 PM   #25
Interruptor Illuminada
 
Trader Score: (0)

Join Date: Apr 2006
Location: MD
Posts: 1,504
Quote:
Originally Posted by 50/50
Are you guys seriosly saying that it's normal for his car to be at 3k at start up? Am I hearing this right? This is what I got from this thread... Somebody please clarify. Im pretty sure theres gotta be something wrong with a sensor thats causing this. I just can't believe that this is normal and putting it in first gear or the other ideas I've read here is the only way to stop this..
Yep, you are hearing (seeing) just right. There is nothing wrong with any sensor. Unless disabled, they all do it. Remove the AWS solenoid and cap the vacuum lines, blip the throttle, or start in gear to keep it from happening like everyone has already said.
riverzendz is offline   Reply With Quote
Old 10-26-06, 05:01 PM
RX7Club
Mazda RX7




Paid Advertisement


 
 
 
Reply

Tags
3000, car, cold, cranking, heat, high, idles, mazda, revs, started, starts, takes, warm, warms, wrong

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 10:32 AM.
All content Copyright 2007 by Internet Brands, Inc.

Contacts

SEO by vBSEO ©2010, Crawlability, Inc.