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Idle drops when brake pedal is applied #205821 Jun 23, 1:57pm Jun 23, 1:57pm
Joined: Feb 2004
Posts: 6
Farmersville, TX
1991 red Toyota Celica GT
lloydjv OP
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1991 Toyota Celica GT
lloydjv OP
1991 red Toyota Celica GT
New Member
1991 Toyota Celica GT

Joined: Feb 2004
Posts: 6
Farmersville, TX
Idle drops when brake pedal is applied
I've had this strange symptom for a few months now, but I can't seem to find anything wrong. This has been a trouble shooting nightmare. The idle also drops drastically when the a/c is switched on, the windows are rolled down, or I open the Sun roof.
I have replaced: all timing components, TPS, coolant temp switch, disty, cap, rotor, plugs, alt, battery, and installed my own grounding kit.
All the lights work, except courtesy door light switches, and this is driving me nuts.
Do you geniuses have any ideas?
Oh, and great job with Gen conversion over here.
Nice to see all of you, kinda, I guess...

Re: Idle drops when brake pedal is applied [Re: lloydjv] #205822 Jun 23, 2:07pm Jun 23, 2:07pm
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Posts: 3
jacksonville florida
9
91stxman
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1991 Toyota Celica STX
91stxman
9
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1991 Toyota Celica STX

Joined: Feb 2004
Posts: 3
jacksonville florida
my car car used to do that before i put my other motor in...as long as the engine doesnt die...your fine ...for the ac there sould be a black thing with a spring and a big skrew looking thing that you can adjust ...mine was way outta adjustment and the car would shut off if the car was idling below 600 rpm


91 celica stx @ 235k......my learning experience
93 camry le @ 228k......custom fabricated 3 inch Intake
Part of the celica.net group that moved to EC.com
Re: Idle drops when brake pedal is applied [Re: 91stxman] #205823 Jun 23, 2:10pm Jun 23, 2:10pm
Joined: Oct 2003
Posts: 1,669
MADERA, CA
2002 Super White Toyota Celica
ravertony
Specialist
2002 Toyota Celica
ravertony
2002 Super White Toyota Celica
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2002 Toyota Celica

Joined: Oct 2003
Posts: 1,669
MADERA, CA
it has something to do with your electrical system by lookin at your description did you check the fuses in the engine bay and the one inside by the stereo.. check it out thumbsup

Re: Idle drops when brake pedal is applied [Re: ravertony] #205824 Jun 23, 2:40pm Jun 23, 2:40pm
Joined: Jun 2004
Posts: 9
Tennessee
1990 Red (For current) Toyota Celica ST
Murgatroy
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1990 Toyota Celica ST
Murgatroy
1990 Red (For current) Toyota Celica ST
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1990 Toyota Celica ST

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Posts: 9
Tennessee
It sounds like a Vacuum problem. Common occurence in old Carbuerated cars. How heavy is it dropping hte idle, almost to the point of stalling? Check you brake booster and all the hoses.

Then again I have never really paid attention to my Celica's brakes... I am sure it is still a traditional Vacuum set up though.


Your thinking privileges have been revoked!
I am now your thought process.
^Chaos. `90 ST.
Re: Idle drops when brake pedal is applied [Re: Murgatroy] #205825 Jun 23, 2:56pm Jun 23, 2:56pm
Joined: Feb 2004
Posts: 6
Farmersville, TX
1991 red Toyota Celica GT
lloydjv OP
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1991 Toyota Celica GT
lloydjv OP
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1991 Toyota Celica GT

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Posts: 6
Farmersville, TX
Thanks, Murg. I am EFI, 91gt similar to Chaos. I will check all these things out, tough.

Re: Idle drops when brake pedal is applied [Re: lloydjv] #205826 Jun 23, 3:07pm Jun 23, 3:07pm
Joined: Jun 2004
Posts: 9
Tennessee
1990 Red (For current) Toyota Celica ST
Murgatroy
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1990 Toyota Celica ST
Murgatroy
1990 Red (For current) Toyota Celica ST
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1990 Toyota Celica ST

Joined: Jun 2004
Posts: 9
Tennessee
I am a self proclaimed Domestic Expert. I recognized your problem instantly, but as our cars are FI I am not certain as to what all transfers. wink I am still learning when it comes to Imports. grin


Your thinking privileges have been revoked!
I am now your thought process.
^Chaos. `90 ST.
Re: Idle drops when brake pedal is applied [Re: Murgatroy] #205827 Jun 23, 10:31pm Jun 23, 10:31pm
Joined: Jun 2004
Posts: 4
Santa Barbara, CA
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damselracer
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Santa Barbara, CA
i thought at first this was a vacuum problem, but that doesnt explain the windows or the sunroof causing the same problem. i think its electrical.

the brake lights put a large draw on the system, as does the a/c, the windows, and the sunroof. the alternator has to work harder to keep up with this draw, and thats causing your idle to drop. If its not so bad that its causing your engine to stall, i would say dont worry about it- most cars will drop at least a little when a large load is put on them at idle, like headlights, or the afore-mentioned brake lights etc.

Re: Idle drops when brake pedal is applied [Re: damselracer] #205828 Jun 23, 11:32pm Jun 23, 11:32pm
Joined: Aug 2003
Posts: 16
Orange County, CA
SaigonCELICA
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1991 Toyota Celica GT
SaigonCELICA
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1991 Toyota Celica GT

Joined: Aug 2003
Posts: 16
Orange County, CA
When I turn my A/C on it raises my idle.


VIVA LA REBELLION!!!
Re: Idle drops when brake pedal is applied [Re: SaigonCELICA] #205829 Jun 24, 1:43pm Jun 24, 1:43pm
Joined: Feb 2004
Posts: 6
Farmersville, TX
1991 red Toyota Celica GT
lloydjv OP
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1991 Toyota Celica GT
lloydjv OP
1991 red Toyota Celica GT
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1991 Toyota Celica GT

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Posts: 6
Farmersville, TX
Thanks all.
Very nice to hear from you again, Damsel. Nice to see you here as well.
My suspicions about this situation you have helped to confirm. If there were a way to boost amperage back to the battery, I think this would solve the problem. thumbsup

Re: Idle drops when brake pedal is applied [Re: SaigonCELICA] #205830 Jun 24, 3:05pm Jun 24, 3:05pm
Joined: Jun 2004
Posts: 4
Santa Barbara, CA
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damselracer
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Santa Barbara, CA
Originally Posted by SaigonCELICA
When I turn my A/C on it raises my idle.

thats normal- there is a high idle switch that turns on to bump the idle up, for exactly the reason i was mentioning before. The A/C puts a large draw on the alternator, as well as drawing power from the engine for the compressor, so it can drastically drop your idle if the engine doesn't do something to compensate. Hence, when you hit the A/C switch, something kicks on and raises the idle so that your engine has enough power to drive both of those things.

Re: Idle drops when brake pedal is applied [Re: lloydjv] #205831 Jun 24, 3:08pm Jun 24, 3:08pm
Joined: Jun 2004
Posts: 4
Santa Barbara, CA
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damselracer
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Santa Barbara, CA
Originally Posted by lloydjv
Thanks all.
Very nice to hear from you again, Damsel. Nice to see you here as well.
My suspicions about this situation you have helped to confirm. If there were a way to boost amperage back to the battery, I think this would solve the problem. thumbsup


you said you just replaced the alternator? it might be that your new alternator isnt made to put out as many amps as the previous one you had, so its having to work harder to make the same power. Like i said, if its not to the point of killing your engine at idle, i wouldnt worry about it. If it is... just bump up the idle a bit tongue

Re: Idle drops when brake pedal is applied [Re: damselracer] #205832 Jun 24, 11:29pm Jun 24, 11:29pm
Joined: Jun 2004
Posts: 9
Elgin, IL
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Playfortoday
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1992 Toyota Celica All-trac Turb
Playfortoday
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1992 Toyota Celica All-trac Turb

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Posts: 9
Elgin, IL
Have a load test done on the car. Autozone offers the service, amongst others. If the alt and bat test ok, I would suggest upgrading the pos wire between the alt and bat, and upgrading all major ground points.


Jay (Playfortoday)
1992 Toyota Celica All-trac Turbo
Elgin, IL
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