I notice my car idles around 750 but at certain times it drops to below 500 and then jumps back. I want to know this because I'm not sure if this is right.

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Stock 2.8 MPFI auto w/ Flowmaster 80 Series, More to come......
New Pioneer Head Unit
Targa E-910 7-Band Equalizer w/ crossover
2x 10" Pioneer subs powered by 300 Watt Jensen amp
2- 6x9" Pioneer (rear)
More to come..... (hey, i dont got a job yet)

 

yep 750 is right, if your idle is dropping below 500 and then bouncing back up to 800 when you do hard stops with the A/C on then you need a new IAC because yours is sluggish and it's not opening fast enough. Believe me it happen to me, I didn't see the worning signs then DEATH, everytime I hit the brakes in traffic it would die.

 

Between 600 & 800, depending on the car's mood


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

well mine is pretty steady at 900. Manual tranny.

 

Hey! Mine does that too! It usually sits at around 750 and sometimes it will drop down to the 500 and sometimes die! It sucks! I still want to know what causes this. And it's not when I stop, sometimes you just start up the car and it can't hold the idle high enough.

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1992 RS 3.1L Bone Stock

"Yeah, it's a V6 SO WHAT!?"

 

800-900 with my 5-speed.

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Accel Cap and Rotor, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Gutted Air Boxes, 8mm Wires, Eibach Sportlines and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"It's not the ricers, it's those damn V8's!"

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro, 2000 3.8 5-speed Camaro.

 

i dotn friggin know because my 2.8 didn't even come with a friggin tach...

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1987 V6 MPFI Camaro SC with a white exterior and a red interior, get more info and a few pics of my ride by clicking here:

https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4760

 

500-550 RPM. Auto.

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89 RS

STILL Looking For:
An 87 IROC-Z28 350 TPI

 

Umm V-6 can you not read? Go troll elsewhere.

 

U see in my sig it says 89 RS?? Thats a 2.8 dude.

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89 RS

STILL Looking For:
An 87 IROC-Z28 350 TPI

 

Hey Camaro Hunter. I can vouch for IROCZTWENTYGR8, he's not a troll. Ease up there man.

 

My 92 RS 3.2L w/5speed idles at the 10 mark. It would somtimes dip and the engine would die. Afterwards I couldn't start it for about 10 min. So this last weekend I swaped the ECM and life is back to normal no diping idle, but still at the 10mark.

 

87Camaro, throw one on! It's not hard at all... the hardest part is leading the tach wires thru the firewall- you'll probably have to drill. Drill from underneath the dash "out" to the engine compartment. You might get lucky and have a factory "plug" in the firewall- knock it out with a punch. The plug's located to the driver's side of the brake booster on the firewall. The next hardest part is finding a spot to mount the tach where it looks good (and can be read easily). Hookup is simple. Your car's tach wire is the black/white wire on the gray connector on your spark coil.


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

my car used to idle anywhere from 1200 to 400..now its idling right at 800...

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1989 Firebird. Modded.
700r4-->t5 w/ram clutch
Cold air, 1.6 rockers, 21lb injectors, 3" y-pipe, random tech cat, 3" ipipe, flowmaster 80 series 3" in 3" out hand made stainless tips, Lakewood LCA's, Msd 6a, Msd coil, Wonder Bar, 180* stat,
Coming Soon: T/a hood, painted, panhard bar,4thgen front seats, compucam, msd 8.5 wires (accel is CRAP)
"I'd rather run last in a full out race, than to NOT have run at all"
See my car Here!
#3 Forever

 

600 permanent, after new digital EGR, ECM, IAC, Coolant sensor, new wires und spark pluggs, new ignition modular

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www.marion-becker-nidda.de
91 Firebird 3.1
Modsynomax ultra flow stainless steel -americanracing rims (ar26) rear 15x8 255/60
front 15x7 235/60
www.members.aol.com/tramphorst/pontiacpics

 

Yes, I'm not, Thanks 350.

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89 RS

STILL Looking For:
An 87 IROC-Z28 350 TPI

 

1250-1500 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Slayer of the following:
1996 Riced-out Honda Civic (all show and no go!!!!!!)
2000 saturn
198? Ford Crown Vic, (no i don't know why he bothered)
1990 Buick LeSabre 3.8
1986 Camaro 2.8
Newer Ford Explorer
Food that makes me sick: RICE
1991 Camaro RS 3.1 V6 5-speed
1991 Z28 Rims with Firestone Firehawks
dual snorkel intake w/ slashed boxes, 2 K&N's, 180* t-stat
my motto: I CAN'T DRIVE 55

 

i can second that!!!!! IROCZTWENTYGR8 is actually REALLY cool!!!!

 

 

0 MPH

 

I assume I idle at 750 or so.
I do not know as my tach is not hooked up yet. I have a gauge cluster to install.
Mine idles so smooth after I've fixed ALL vacuum line breaks (EVERY SINGLE LAST ONE OF THEM, SEEK AND YE SHALL FIND THEM!!) and swapped out a bad ICM. I have also cleaned the Idle control sensor in the throttle body, too.
All those things contribute.
BUT
BUT
BUT
Cheapest fix & BEST FREE EFFORT was the vacuum lines! Use 5/16" & 1/4" windshield wiper hose for repairs.
I'll bet if ya check codes, you'll see malfunctions, too.
I eliminated my malfunction codes by repairng vacuum leaks. Saved me over $75 (from buying another MAS sensor!)! Codes went away! Super smooth idle now! Clear computer after you think you solved all the vacuum leaks and check codes again. I think you'll have none!

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

won't STP fuel injector cleaner do the trick? i use it on my car i just got and i notice a smoother idle... smoother acceleration and a big increase in response

 

My tachometer is there...but it's faulty. It says I idle at about 1400, with a normal operating temp engine..

91 RS 3.1 V-6

 

My tachometer is there...but it's faulty. It says I idle at about 1400, with a normal operating temp engine..

91 RS 3.1 V-6

 

Hmmm, sounds like you have the same problem as mine, I can;t find the problem and it won;t run (Good that is) unless it is over 1100 rpm....