What causes sudden rough idle?
10-23-2006, 05:23 PM
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Car: 1986 Camaro Sport Coupe
Engine: 305 V8 LG4
Transmission: 700R4
What causes sudden rough idle?
My car ran perfect on Sunday. On Monday morning, I started it up, and immediately it was idling very rough. This has never happened before in the 20 years I've had the car.
I drove it about 50 miles today on normal roads, and it drove fine. The only issue is that it idles rough.
Any ideas for what I can check myself before I take it to the garage?
Thanks,
John
I drove it about 50 miles today on normal roads, and it drove fine. The only issue is that it idles rough.
Any ideas for what I can check myself before I take it to the garage?
Thanks,
John
10-23-2006, 05:32 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Vacuum leak you can check yourself. Look for a hissing hose underhood.
10-23-2006, 05:33 PM
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Car: 89 RS
Engine: 305
Transmission: Auto w/ evil shift kit; not my doin
Axle/Gears: It has a locker; not my doing
Check the choke on the carb, then check your contact points on your dist cap. Possible problem with o2 sensor. Good luck.
10-23-2006, 05:34 PM
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Car: 89 Firebird
Engine: 408
Transmission: 700r4
Axle/Gears: 12 bolt/4.11
Vaccum leak and check if your getting a good flow of fuel!
Last edited by BlkBird408; 10-24-2006 at 04:45 AM.
10-23-2006, 07:38 PM
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Car: 1986 Camaro Sport Coupe
Engine: 305 V8 LG4
Transmission: 700R4
Ok, I found a small hose that was detached near the windshield. I reattached it, and that fixed it. It idles perfectly again.
I'm attaching a picture of the hose, what is this???
Thanks for your help!!!
-John
I'm attaching a picture of the hose, what is this???
Thanks for your help!!!
-John
10-23-2006, 07:56 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
whoo hoo!
Doing my happy dance! woot, woot!
Called it, called it!!!
haha, I just like getting the right answer.... Wish my profs would agree with me more often...
I think that's for HVAC stuff.
Doing my happy dance! woot, woot!
Called it, called it!!!
haha, I just like getting the right answer.... Wish my profs would agree with me more often...
I think that's for HVAC stuff.
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10-23-2006, 08:09 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
It's still a vacuum line, with it detached, the motor got a schwack more air than it needed, without the fuel to match, so the idle went to hell.
I've heard that some HVAC units on these cars require a vacuum source to power it sorta thing. Helps keep certain ducts open in certain positions or something like that. I've never seen it on my car, so I can't say.
But a vacuum line on the firewall, driverside, in that place, sounds like HVAC to me.
I've heard that some HVAC units on these cars require a vacuum source to power it sorta thing. Helps keep certain ducts open in certain positions or something like that. I've never seen it on my car, so I can't say.
But a vacuum line on the firewall, driverside, in that place, sounds like HVAC to me.
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