Car doesnt like to idle in the morning

tsupra89 · 12-18-2007, 03:01 PM

brake booster, brake booster, brake booster. i have the same problem the car will crank and it will flucuate in revs and when you try to press the gas it like to die then rev up like 4 seconds later. i thought my cold start injector, which it still might be but i lost my brakes the other day and when i lost my brake my engine went weird reving slow reving high flucuating, and the brake booster was making weird sounds so look at the cold start injector or the brake booster.

Supra2NR · 12-18-2007, 03:51 PM

or it could also be a boost leak sumwhere

XxSupra4LifexX · 12-18-2007, 10:10 PM

Actually, i replaced the brake booster like 2 months ago. i still have all of my brakes, and it only happens in the morning. once the car is warmed up it idles. so i know its not my brake booster, and as for the boost leak, my car isnt turbo.

Supra2NR · 12-18-2007, 10:34 PM

a vacuum leak then lol

XxSupra4LifexX · 12-18-2007, 10:37 PM

yeah, i also thought about that. but wouldnt that cause the idle to fluctuate all the time and not just in the morning?

Pretaco · 12-22-2007, 12:59 AM

x2 on vacuum leaks.

A lot of the time the vacuum leak will go away after warming up due to the metal parts expanding and sealing the leak back up.
Pinch off your brake booster hose before starting it one morning to rule it out.
The cold start injector won't make it idle bad, just makes it take longer to start on first start, but once it does start the injector shuts off. If it cranks for 15-30 seconds before starting, then look at that injector.
Do you have a check engine light? If the engine coolant temp sensor is bad, the ecu uses 180 degrees as a failsafe so that the engine will still run, but when it is cold, it will run like crap.
Hate to say it, but a blown head gasket will make a car run like crap when first started, but then clear up as the coolant gets burned out of the cylinders.

XxSupra4LifexX · 12-24-2007, 07:27 AM

actually, i found out what it was. it wasnt a vaccuum leak or my cold start injector. my coolant temp sensor was unpluged. the little clip fell out. so i plugged it back in and it started up and ran fine.

12-18-2007, 03:01 PM	#1
tsupra89 3" Exhaust Join Date: Sep 2007 Location: asheville Posts: 71	brake booster, brake booster, brake booster. i have the same problem the car will crank and it will flucuate in revs and when you try to press the gas it like to die then rev up like 4 seconds later. i thought my cold start injector, which it still might be but i lost my brakes the other day and when i lost my brake my engine went weird reving slow reving high flucuating, and the brake booster was making weird sounds so look at the cold start injector or the brake booster. __________________ 89 Supra Boosted 11psi lexus afm k&n air system aeromotive fuel pressure regulator walboro fuel pump stage 3 weitght reduction koki style tail lights silver and black 2 tone paint Enkei rs7 17" 17.5lbs each hankook ventus hr2's 225/45/17 apc hood pins yellow fogs ----------------- Soon To be Megan racing seats, roll bar, either takata or sparco harnesses

12-18-2007, 03:51 PM	#2
Supra2NR 1000whp postwhore Join Date: Apr 2006 Location: Chi-Town Posts: 1,643	or it could also be a boost leak sumwhere __________________ http://www.myspace.com/supra_2nr Into Bikes now,, apparently the supra couldnt kill me, so my zx6 might lol

12-18-2007, 10:10 PM	#3
XxSupra4LifexX Stock Join Date: Dec 2007 Location: Lake Elsinore Posts: 15	Actually, i replaced the brake booster like 2 months ago. i still have all of my brakes, and it only happens in the morning. once the car is warmed up it idles. so i know its not my brake booster, and as for the boost leak, my car isnt turbo. __________________ 1986.5 MKIII(7MGE soon to be 7MGTE)

12-18-2007, 10:34 PM	#4
Supra2NR 1000whp postwhore Join Date: Apr 2006 Location: Chi-Town Posts: 1,643	a vacuum leak then lol __________________ http://www.myspace.com/supra_2nr Into Bikes now,, apparently the supra couldnt kill me, so my zx6 might lol

12-18-2007, 10:37 PM	#5
XxSupra4LifexX Stock Join Date: Dec 2007 Location: Lake Elsinore Posts: 15	yeah, i also thought about that. but wouldnt that cause the idle to fluctuate all the time and not just in the morning? __________________ 1986.5 MKIII(7MGE soon to be 7MGTE)

12-22-2007, 12:59 AM	#6
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	x2 on vacuum leaks. A lot of the time the vacuum leak will go away after warming up due to the metal parts expanding and sealing the leak back up. Pinch off your brake booster hose before starting it one morning to rule it out. The cold start injector won't make it idle bad, just makes it take longer to start on first start, but once it does start the injector shuts off. If it cranks for 15-30 seconds before starting, then look at that injector. Do you have a check engine light? If the engine coolant temp sensor is bad, the ecu uses 180 degrees as a failsafe so that the engine will still run, but when it is cold, it will run like crap. Hate to say it, but a blown head gasket will make a car run like crap when first started, but then clear up as the coolant gets burned out of the cylinders. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

12-24-2007, 07:27 AM	#7
XxSupra4LifexX Stock Join Date: Dec 2007 Location: Lake Elsinore Posts: 15	actually, i found out what it was. it wasnt a vaccuum leak or my cold start injector. my coolant temp sensor was unpluged. the little clip fell out. so i plugged it back in and it started up and ran fine. __________________ 1986.5 MKIII(7MGE soon to be 7MGTE)

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