Rough idle
06-06-2019, 07:14 PM
#1
Melting Slicks
Thread Starter
Rough idle
Picked this convertible up 3 weeks ago and noticed a rough idle. I figured I'd toss in a bottle of Chevron cleaner with Techron just as a possible solution. Two tanks later it is still a little rough. The water in my bottle moves from it. Anybody know of anything else I should check like the IAC or cleaning the throttle body? 60K miles on it and previous maintenance unknown.
Thanks guys
Thanks guys
06-06-2019, 07:21 PM
#2
Team Owner
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St. Jude Donor '11-'12-'13, '16-'17-'18
LT1 is kinda known for a rough idle.....
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06-06-2019, 08:17 PM
#3
Team Owner
Agree.^^^^^^
06-06-2019, 08:32 PM
#4
Pro
I think they all do.
06-06-2019, 09:25 PM
#5
Le Mans Master
Yup, they all do....
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Art17 (06-10-2019)
06-06-2019, 10:09 PM
#6
Melting Slicks
Yes compared to my previous C6Z it is rough. According to my personal friend and Corvette Technician, part of the problem is related to the direct injection. His recommendation to help in minimizing carbon build up on the back of the valves, is to run up the rpm's in the lower gears from time to time.
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06-06-2019, 10:14 PM
#7
Team Owner
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Ttt
Man check your spark plug wires. ALSO they are a big PITA to make sure they are fully on the plugs... My stock c7 never did run like you are saying until the time I chg out the wires and didnt get one totally hooked up good..Also in here a number of guys had had this problem just from a wire coming a little loose. Robert
Last edited by robert miller; 06-06-2019 at 10:18 PM.
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yellow2007 (06-07-2019)
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06-07-2019, 11:26 AM
#9
Safety Car
I thought this was a feature of the LT1 V8 - it has that old school muscle car rumble at low RPMs that shakes the car.
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yellow2007 (06-07-2019)
06-07-2019, 11:33 AM
#10
Team Owner
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St. Jude Donor '11-'12-'13, '16-'17-'18
Yes compared to my previous C6Z it is rough. According to my personal friend and Corvette Technician, part of the problem is related to the direct injection. His recommendation to help in minimizing carbon build up on the back of the valves, is to run up the rpm's in the lower gears from time to time.
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devnull (06-09-2019)
06-07-2019, 12:02 PM
#11
Le Mans Master
There's a service bulletin for adjusting the engine mounts on some of the early cars. But the engine is supposed to have a noticeable rumble at idle.
06-07-2019, 02:58 PM
#12
Instructor
It is an American V8 muscle car. Have you been in one of those before?
Yea, they are intentionally unrefined. You want refined and LGBT friendly, get a Porsche.
Yea, they are intentionally unrefined. You want refined and LGBT friendly, get a Porsche.
06-07-2019, 07:42 PM
#13
Burning Brakes
I ran a bottle of Lucas fuel system cleaner though mine and now only use Shell gas, it’s better now.
Last edited by The Successful Plumber; 06-07-2019 at 07:45 PM.
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yellow2007 (06-07-2019)
06-07-2019, 09:27 PM
#15
06-08-2019, 09:33 AM
#17
Burning Brakes
My 2017 started to do this a few months ago. I took it into the dealer and they said it needed a PCM update. It seemed to help a lot. It still has a little vibration but that is normal for that motor.
06-08-2019, 04:57 PM
#20
Race Director
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"I thought this was a feature of..." 
And, check the cam specs... that ain't it, if interpreted as typically done.
And, check the cam specs... that ain't it, if interpreted as typically done.