High idle at start up
Thread Starter
Junior Member
Joined: May 2006
Posts: 40
Likes: 0
From: Orlando, Florida
Car: 1986 IROC Z
Engine: 305 4bbl.
High idle at start up
Hey guys, I looked for an hour for a topic that coverd this with little luck.
Anyway, Ive had the car for about 4 mo. now. When I got it it would sit at 1100 RPMS after 1st starting it, after a min. I would pop the pedal and it would go back to 800 or so. imo, it was good to go.
For the last couple weeks, when I start it in the AM it makes its way up to about 2000 RPMS and wont come down till its good and ready. It seems to last longer that the 1100 RPMS did, it dont sound right and makes me a lil nervous to have it sit that high after 1st starting it. This only happens 1st thing, after that it starts normaly.
Any ideas on why its happening, and what to do to fix it?
Also, is it normal for the ALT. to run in the lower half of the gage at a stop light? I have the fog lights on all the time, and with the a\c on it will dip pretty low. as I get going, it goes back up and if I rev it up, it will come up. Is the Alt. going bad??
Thx!
Anyway, Ive had the car for about 4 mo. now. When I got it it would sit at 1100 RPMS after 1st starting it, after a min. I would pop the pedal and it would go back to 800 or so. imo, it was good to go.
For the last couple weeks, when I start it in the AM it makes its way up to about 2000 RPMS and wont come down till its good and ready. It seems to last longer that the 1100 RPMS did, it dont sound right and makes me a lil nervous to have it sit that high after 1st starting it. This only happens 1st thing, after that it starts normaly.
Any ideas on why its happening, and what to do to fix it?
Also, is it normal for the ALT. to run in the lower half of the gage at a stop light? I have the fog lights on all the time, and with the a\c on it will dip pretty low. as I get going, it goes back up and if I rev it up, it will come up. Is the Alt. going bad??
Thx!
Senior Member
Joined: Jul 2005
Posts: 566
Likes: 0
Car: 1998 Volvo S70
Engine: B5254S Engine
Transmission: Automatic
Axle/Gears: It's a volvo?
Originally Posted by Rick James
Hey guys, I looked for an hour for a topic that coverd this with little luck.
Anyway, Ive had the car for about 4 mo. now. When I got it it would sit at 1100 RPMS after 1st starting it, after a min. I would pop the pedal and it would go back to 800 or so. imo, it was good to go.
For the last couple weeks, when I start it in the AM it makes its way up to about 2000 RPMS and wont come down till its good and ready. It seems to last longer that the 1100 RPMS did, it dont sound right and makes me a lil nervous to have it sit that high after 1st starting it. This only happens 1st thing, after that it starts normaly.
Any ideas on why its happening, and what to do to fix it?
Also, is it normal for the ALT. to run in the lower half of the gage at a stop light? I have the fog lights on all the time, and with the a\c on it will dip pretty low. as I get going, it goes back up and if I rev it up, it will come up. Is the Alt. going bad??
Thx!
Anyway, Ive had the car for about 4 mo. now. When I got it it would sit at 1100 RPMS after 1st starting it, after a min. I would pop the pedal and it would go back to 800 or so. imo, it was good to go.
For the last couple weeks, when I start it in the AM it makes its way up to about 2000 RPMS and wont come down till its good and ready. It seems to last longer that the 1100 RPMS did, it dont sound right and makes me a lil nervous to have it sit that high after 1st starting it. This only happens 1st thing, after that it starts normaly.
Any ideas on why its happening, and what to do to fix it?
Also, is it normal for the ALT. to run in the lower half of the gage at a stop light? I have the fog lights on all the time, and with the a\c on it will dip pretty low. as I get going, it goes back up and if I rev it up, it will come up. Is the Alt. going bad??
Thx!
Nah, there's nothing to fix. Its normal for the car to sit at 1100 rpms after you fire her up for the day. It just makes it so that the motor can warm up quicker.
It can be an annoyance especially if you are in a hurry, but I always try to give my car atleast a minute to warm up. Lately although my car hasn't been starting with a high idle.
as for alternator question, ummm first check and see how old your battery is. My battery is like 4 months old and whenever I have my lights on, the gauge stays in the middle.
I find the revving part weird though? Not sure I understand that part
Senior Member
Joined: May 2006
Posts: 514
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From: NorCal
Car: 91 Camaro RS(RealSlow)
Engine: 3.1L
Transmission: 700R4
Axle/Gears: unknown/mostlikelycrappy
for the idle part, its been explained.
depending on surrounding temperature i think the RPM could start
from 2000 to warm up the engine faster.
i know with the loud car like ours, it might sound a little like a problem there,
but its really normal.
for the alternator, the A/C does take lots of voltage away(i think)
so it could be normal, at least it happens with my car too.
but my alternator and battery is brandnew, so yeah..
my guess for the rev is that
when ur engine is rotating faster, ur alternator spins faster too(im not totally sure)
so it would make sense there to have the V little higher when revved up.
again im not totally sure.. but just to give u relief my alternator is BRAND NEW bought 3days ago, my battery is 2month old,
and my voltage does the same thing as urs(lower with A/C, rise a bit when revved)
depending on surrounding temperature i think the RPM could start
from 2000 to warm up the engine faster.
i know with the loud car like ours, it might sound a little like a problem there,
but its really normal.
for the alternator, the A/C does take lots of voltage away(i think)
so it could be normal, at least it happens with my car too.
but my alternator and battery is brandnew, so yeah..
my guess for the rev is that
when ur engine is rotating faster, ur alternator spins faster too(im not totally sure)
so it would make sense there to have the V little higher when revved up.
again im not totally sure.. but just to give u relief my alternator is BRAND NEW bought 3days ago, my battery is 2month old,
and my voltage does the same thing as urs(lower with A/C, rise a bit when revved)
Thread Starter
Junior Member
Joined: May 2006
Posts: 40
Likes: 0
From: Orlando, Florida
Car: 1986 IROC Z
Engine: 305 4bbl.
cool, Ill stop looking at the ALT. every 3 sec.
the high rev. at startup still seems weird to me though. I live in Fla. and its 80+ when I go to start it.
The 1100 RPMs is cool, I understand how that works. But for it to go almost 1000 RPMs higher and sit there seems strange. (I really see no reason for it to be up there while warming up) If I lived in a cold place, I would really not like it. Just seems that 2000ish RPMs a split sec. after turning it on and it not wanting to come down for awhile would be bad for a "cold" engine
Plus the fact that it never did it before, leads me to think there might be something to adj. (?) I shudder to think what might happen if I tried to put it in gear while it was up there.
the high rev. at startup still seems weird to me though. I live in Fla. and its 80+ when I go to start it.
The 1100 RPMs is cool, I understand how that works. But for it to go almost 1000 RPMs higher and sit there seems strange. (I really see no reason for it to be up there while warming up) If I lived in a cold place, I would really not like it. Just seems that 2000ish RPMs a split sec. after turning it on and it not wanting to come down for awhile would be bad for a "cold" engine
Plus the fact that it never did it before, leads me to think there might be something to adj. (?) I shudder to think what might happen if I tried to put it in gear while it was up there.
Junior Member
Joined: Feb 2006
Posts: 74
Likes: 0
From: fort gratiot, michigan
Car: 1982 Pontiac Trans Am
Engine: 383 stroker 4 bolt roller, juiced
Transmission: b&M th400
Axle/Gears: 4.10 with c-clip elims
could be a bad vacume leak somewere check all the vacume hoses on the motor... if one is cracked or even off... it will idle high from the extra incomming air... and it will take a while for the computer to adjust to the added air its not supose to have....
Computer controlled QJet?
If so, there is a fast idle speed setting screw that will affect ONLY your high idle (when the choke is on). You can see the screw heads (Torx head) underneath the mess of choke linkages on the pass. side of the carb. Look for it when the choke is on (engine cold). Small changes in this can make a big change in fast idle speed.
1500 on a cold engine is plenty. Tap the gas to let the choke set, fire it up, let it settle in for a second or two and then adjust it. Remember you only get one shot at this every morning before it starts to warm up and the choke begins to open.
Once the choke opens fully this screw has no effect on idle speed and you use the regular idle speed screw on the driver's side of the carb as usual.
FYI- the cc-QJet has several "steps" on the high idle speed linkage. It'll sit on the highest one when you first fire it up and the choke is fully engaged. It'll slowly work it's way down the steps (only if you blip the throttle occasionally to unload the choke linkages) over the course of several minutes and the idle will slow down a little with each step. Maybe 2 minutes until the choke opens fully on a warm day, maybe 4-5 in the dead of winter.
If so, there is a fast idle speed setting screw that will affect ONLY your high idle (when the choke is on). You can see the screw heads (Torx head) underneath the mess of choke linkages on the pass. side of the carb. Look for it when the choke is on (engine cold). Small changes in this can make a big change in fast idle speed.
1500 on a cold engine is plenty. Tap the gas to let the choke set, fire it up, let it settle in for a second or two and then adjust it. Remember you only get one shot at this every morning before it starts to warm up and the choke begins to open.
Once the choke opens fully this screw has no effect on idle speed and you use the regular idle speed screw on the driver's side of the carb as usual.
FYI- the cc-QJet has several "steps" on the high idle speed linkage. It'll sit on the highest one when you first fire it up and the choke is fully engaged. It'll slowly work it's way down the steps (only if you blip the throttle occasionally to unload the choke linkages) over the course of several minutes and the idle will slow down a little with each step. Maybe 2 minutes until the choke opens fully on a warm day, maybe 4-5 in the dead of winter.
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