Three questions from a newbie!
Thread Starter
Racer
Joined: Jun 2006
Posts: 286
Likes: 0
From: Plainfield Illinois
Three questions from a newbie!
I'm starting to go through the 85 I just purchased and have two questions related to that plus one general question. Here we go:
1. I changed the plugs and wires and did a Seafoam treatment (the smoke is cool!). When I am idling it is all over the place from 500 rpm to 950 -- just fluctuating back and forth. It is worse when I am in drive with my foot on the break at a stoplight. Why?!?!?!?!
2. Tried the parking break, now the dash warning light wont go off. The break isnt engaged.
3. Best Corvette magazine. Ive seen Corvette Fever and Corvette Enthusiast. Any others?
Thanks!!
1. I changed the plugs and wires and did a Seafoam treatment (the smoke is cool!). When I am idling it is all over the place from 500 rpm to 950 -- just fluctuating back and forth. It is worse when I am in drive with my foot on the break at a stoplight. Why?!?!?!?!
2. Tried the parking break, now the dash warning light wont go off. The break isnt engaged.
3. Best Corvette magazine. Ive seen Corvette Fever and Corvette Enthusiast. Any others?
Thanks!!
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I would check out the TPS and clean the IAC to troubleshoot #1. The procedure is on my website (click on my name at the left, it'll come up)
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Re/ the park brake light issue, I'd check the switch for proper operation and adjustment, assuming that the brake, cable and lever are indeed fully releasing. I've not seen all of the Vette mags but the ones I've seen I've not been overly impressed with, especially for C4 info. I'd rather do my own research, here and other places on the internet.
Burning Brakes
Joined: Aug 2005
Posts: 1,152
Likes: 1
From: It's Bad Ass in Black! Cape Coral, Florida
I have an 85 
and I get more info here than in any book or magazine, but I'm not saying not to read any! Its the experience that's worthy here. By the way, I have to try that seafoam........
Do what Vader says, any questions, ask!!!
and I get more info here than in any book or magazine, but I'm not saying not to read any! Its the experience that's worthy here. By the way, I have to try that seafoam........ Do what Vader says, any questions, ask!!!
Last edited by thecatmac; Jun 26, 2006 at 07:50 PM.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
The unstable is probably do to a vacuum leak and/or dirty IAC and TB. Vader86's website will tell you haow to adjust the TPS and minimal idle. For the IAC I would take it out of the bottom of the TB and clean it good with carb cleaner and a toothbrush. When the TB and IAC are clean and you have set minimal idle, if it is still there, check for vac leaks. It's easier to take the TB off to get the IAC off.
