2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

cold start assist takes tooooooo long!

Old Oct 3, 2004 | 04:03 PM
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Question cold start assist takes tooooooo long!

i got a new thermostat and i was hoping it would change the warm up procedure a bit but i guess i was wrong. is there anything i could do so i dont have to wait 10 mins for my car to warm up?
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Old Oct 3, 2004 | 04:06 PM
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You live in So.Cal., you need to wait for your car to warm up?

The accelerated warmup system isn't good for your car.
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Old Oct 3, 2004 | 05:22 PM
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decrease the size of your sig.
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Old Oct 3, 2004 | 07:18 PM
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i dunno it just takes too damm long for the idle to get down, i just wish i knew a way to disable the cold start assist. stupid ecu, it thinks we live in freakin alaska and i dont want to drive around til my rpms drop, that sounds a bit risky.
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Old Oct 3, 2004 | 09:12 PM
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start the car in gear
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Old Oct 3, 2004 | 09:45 PM
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there are 3 different things....

the cold start assist is a fluid bottle which is useless and never used. it's not what you mean.

acclerated warm up is when the car revs to 3000 at start up and stays there for a few secs to maybe 30. this is really bad. always start the car in gear to prevent this from happening. it's controled by the ECU.

3rd is the fast idle. this idles the car at 1500 untill it's fully warm. this is a mech. thing and has nothing to do with the ECU.

if you want it to warm up faster. drive the dam thing. leting it idle is the worst thing you can do. 1/4 throttle and 3000rpm max till the idle drops. yes it takes 5-10 mins.
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Old Oct 3, 2004 | 10:11 PM
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From: Coldspring TX
There are several ways to disable the 3K warm-up:

1) disconnect at least one connector from the radiator water temp switch, in the lower left hand corner.
2) disconnect the plug from the bottom of the air bypass solenoid relay, forward of the intake, behind the right headlight area
3) remove the air bypass solenoid valve, and plug the openings (or, just pull the connector off)
4) everything else that's already been said, lol

Note # 2 & 3 is not a good idea if you still have power steering on the car
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Old Oct 4, 2004 | 12:03 AM
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Originally Posted by DerangedHermit
The accelerated warmup system isn't good for your car.
Please elaborate...?
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Old Oct 4, 2004 | 12:25 AM
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Old Oct 4, 2004 | 12:29 AM
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Originally Posted by Kenteth
Please elaborate...?
Unless I've been misinformed (quite possible) Mazda sent out a bulletin saying that the AWS is bad and should be removed.
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Old Oct 4, 2004 | 12:45 AM
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Originally Posted by DerangedHermit
Unless I've been misinformed (quite possible) Mazda sent out a bulletin saying that the AWS is bad and should be removed.
No. They did however send out a bulletin saying the Cold-Start-Assist(Sub-Zero injector) should be removed. That is *completely* different.

AWS gets the engine warm enough to drive so you're not driving harshly on a cold engine. Its a good thing, not a bad thing.


EDIT:

Service Bulletin Number: C5-018/88
Bulletin Sequence Number: 081
Date of Bulletin: 8810
NHTSA Item Number: SB004773
Make: MAZDA
Model: RX7
Year: 1988
Component: ELECTRICAL SYSTEM:IGNITION:OTHER PART
Summary: HARD START WITH COLD ENGINE CORRECTIVE ACTION IF COMPLAINS
OF HARD STARTING IN COLD
WEATHER: RESTARTING AFTER
SHORT DISTANCE DRIVING AND AFTER MOVING FROM GARAGE, STOPPING ENGINE
THEN RESTARTING-CHANGE
SPARK PLUG TO NEW AIR GAP
TYPE-DISCONNECT SUB ZERO STARING ASSIST DEVICE (IF EQUIPPED)-ALL 1986
TO 1988 MAZDA RX7 MODELS TLH



ALSO TSB: # F00590 JUN 90 Sub Zero Starting Assist Device - Discontinued


Second...as far as that stupid cold start assist sub zero BS there are TSB's that recommend removing it and plugging the line. I have never seen one work, and they stopped installing them in about 1990 for the most part, and some cars never got them at all before that. I always take them off, and sometimes I test the motors...the dc motor is usually no good anway, so it couldnt pump anytihing if it wanted.


Kevin Landers Morristown, TN
Rotary Resurrection, FC repair and parts

Last edited by Kenteth; Oct 4, 2004 at 12:52 AM.
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Old Oct 4, 2004 | 12:52 AM
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From: Knoxville, TN 37916
Originally Posted by Kenteth
No. They did however send out a bulletin saying the Cold-Start-Assist(Sub-Zero injector) should be removed. That is *completely* different.

AWS gets the engine warm enough to drive so you're not driving harshly on a cold engine. Its a good thing, not a bad thing.


EDIT:

Service Bulletin Number: C5-018/88
Bulletin Sequence Number: 081
Date of Bulletin: 8810
NHTSA Item Number: SB004773
Make: MAZDA
Model: RX7
Year: 1988
Component: ELECTRICAL SYSTEM:IGNITION:OTHER PART
Summary: HARD START WITH COLD ENGINE CORRECTIVE ACTION IF COMPLAINS
OF HARD STARTING IN COLD
WEATHER: RESTARTING AFTER
SHORT DISTANCE DRIVING AND AFTER MOVING FROM GARAGE, STOPPING ENGINE
THEN RESTARTING-CHANGE
SPARK PLUG TO NEW AIR GAP
TYPE-DISCONNECT SUB ZERO STARING ASSIST DEVICE (IF EQUIPPED)-ALL 1986
TO 1988 MAZDA RX7 MODELS TLH

ALSO TSB: # F00590 JUN 90 Sub Zero Starting Assist Device - Discontinued
Eh, thanks for the info.
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Old Oct 4, 2004 | 12:52 AM
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From: Rapid City, SD
Originally Posted by DerangedHermit
Eh, thanks for the info.
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Old Oct 4, 2004 | 02:06 AM
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From: so cali
thanks to all for the helpful info. i started my car in gear earlier and it idles at 2k, then after 2 mins or so i just drove off and it went down eventually in about 5 mins or so.is that normal?
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Old Oct 4, 2004 | 03:13 AM
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Originally Posted by Kenteth
AWS gets the engine warm enough to drive so you're not driving harshly on a cold engine. Its a good thing, not a bad thing.
No, it is a bad thing. There is no way revving a stone cold engine to 3000rpm will ever be good for it. The engine wear this causes will be far higher with than a normal 1000rpm cold idle. The only reason Mazda did it was to get the pre-cat up to light-off temp quicker, not to warm the engine up. It was a quick-fix to pass US emissions regs and smacks of desperation on Mazda's part. IMO the AWS solenoid valve should always be removed.
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Old Oct 4, 2004 | 04:44 AM
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From: Rapid City, SD
hmm, interesting... I stand corrected
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Old Oct 4, 2004 | 07:19 AM
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OK, I guess it's time to stop my car from revving to 3k at start up?
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Old Oct 5, 2004 | 10:15 PM
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From: so cali
something wierd happened today, as most of u know i changed my thermostat a couple days ago, my temp guage always goes to the 1/4th mark, but today it barely went up .just barely before 1/4 mark, and i was driving her pretty hard it didnt go up any further like it use to, is this normal for a new thermostat??
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Old Oct 5, 2004 | 11:47 PM
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maybe your new thermostat actually works well... if the reading on the guage is erratic or nonexistent sometimes maybe your temp sensor is flaking out... happened to my saturn.
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