Can't fix idle!
#1
Senior Member
Thread Starter
Can't fix idle!
Well heres whats going on. I have a low idle it useually sets about 750 RPM's, and sometimes it will shutter down to like 500-600. I've adjusted the tps and I've tired to adjust the idle but it never stays. Ive replaced all the vacuum lines so I know there all good. Is there anything else I can check?
#6
Senior Member
Thread Starter
No I don't have a PFC. The car is basically stock. And thanks for the picture I thought thats where it was but I never could get a screw driver on anything in there, Ill try again.
Trending Topics
#8
Senior Member
Thread Starter
I figured this thats why I asked you guys on the forum hoping you could help me out with what I should be looking at to fix this problem. Does anyone know what could cause this problem?
#12
Full Member
Join Date: Feb 2007
Location: Melbourne, Florida
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
Is this the same screw as the air bleed screw? Cause I am having somewhat same issues with my idle with the deal that when sitting at idle if I rev the engine it goes down to about 5 or 600 RPM then vibrates for a little bit then goes back to normal around 800 or so.
#13
same problem here exactly - but I haven't replaced all of my vacuum hoses yet, just 1 solenoid that was causing boost issues. When idle drops down to 500-600, does it bounce pretty steadily? And usually not respond to gas unless you half-floor it?
#16
Full Member
Join Date: Feb 2007
Location: Melbourne, Florida
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
Mine shutters also then goes back to normal after giving it a good rev at idle. I think lossening the air bleed screw will help this though. Or bumping up the idle. Maybe someone can still help us though on this.
#17
Full Member
Join Date: Feb 2007
Location: Melbourne, Florida
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
No I dont have any problems like that at all. Just shutters a bit then goes back to its normal work of a nice smooth idle at around 800
#19
Senior Member
Thread Starter
I think I have mine fixed. I adjusted the other idle screw and then readjusted the one on the front of the throttle body and it seams to be working for now.
#20
Junior Member
Join Date: Feb 2008
Location: Stony Plain Alberta
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Well I just went and looked at my throttle body and there is a black peice covering the screw and im not sure if I can reach in their
I have my car booked for a mechanic but it would be nice to fix it earlier
I have my car booked for a mechanic but it would be nice to fix it earlier
#21
Recovering Miataholic
Same problem here, although my car is a stock '94, except for a DP replacing the pre-cat converter. In my case, I set the secondary throttle butterflies closed, and the primary throttle stop screw so that the idle speed adjust screw (air bypass screw shown in the picture above) was about 1/2 turn out at 720 rpm. With "TEN" jumpered to "GND" in the Diagnostic Connector, I set the lower of the two unpredictable idle speeds to 720 rpm. When warm, the engine just randomly moves between 720 rpm and about 1100 rpm. In either state, the idle continues at that speed. When at the lower speed, idle is smooth. When at 1100 rpm, there is a noticeable "miss," as if there is a vacuum leak. I have replaced all 68 vacuum hoses with Viton, and am convinced that they are all solidly attached. When the UIM was off the car, I sprayed both the IAC valve and the AWS valve with WD-40, and verified their rods move smoothly.
Is there any possibility this idle speed variation is caused by the EGR valve intermittently sticking open when it is supposed to be shut? IS it supposed to be shut at idle?
Is there any possibility this idle speed variation is caused by the EGR valve intermittently sticking open when it is supposed to be shut? IS it supposed to be shut at idle?
#22
I swear my car hates me!
Join Date: Jun 2002
Location: San Diego, CA
Posts: 629
Likes: 0
Received 0 Likes
on
0 Posts
Well, I guess I can join the "same problem here" club. My car idled fine before I took off the UIM about 3 weeks ago. After removing the AWS and ISC, I put everything back together. Now after warm up my car idles as low as 600ish-sometimes even stalling. Never had this problem before. Any tips?
#23
wannaspeed.com
iTrader: (23)
Well, I guess I can join the "same problem here" club. My car idled fine before I took off the UIM about 3 weeks ago. After removing the AWS and ISC, I put everything back together. Now after warm up my car idles as low as 600ish-sometimes even stalling. Never had this problem before. Any tips?
#25
wannaspeed.com
iTrader: (23)
did you set the idle to all zeros in the power fc? once you remove the ISC you will need to go to manual idle control. You may need to adjust your idle fuel and ignition maps. When using the power fc to control the idle it uses hidden maps and the ISC.
Have you adjusted the idle bleed screw on the manifold? Or any of the other idle adjustments on the throttle body?
Chuck westbrook has some very useful tuning notes on how to set up manual idle control if you don't already have the notes.
Have you adjusted the idle bleed screw on the manifold? Or any of the other idle adjustments on the throttle body?
Chuck westbrook has some very useful tuning notes on how to set up manual idle control if you don't already have the notes.