Hot start/Timing relation
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Long story short I had it a dealership that has a corvette guy. He found the distributor was not "aligned?" right (I had paid a guy to change it to HEI and then back to original) so he set the timing to what the emissions label said and adjusted the fuel and air screws.
When i left the dealership it was so sluggish it accelerating it was embarrassing so when I got home I nudged the timing up, knowing what my starting point was.
When i left the dealership it was so sluggish it accelerating it was embarrassing so when I got home I nudged the timing up, knowing what my starting point was.
Thread Starter
Drifting
Joined: Nov 2013
Posts: 1,806
Likes: 258
From: Dublin Ohio
Originally Posted by 7T1vette
You would have to test which way the TCS solenoid worked. If it passes vacuum when not powered, you could just leave it all connected as is but not put the electrical connector back on the solenoid. If it blocks passes vacuum when powered, then you would need to send 12vdc signal to the solenoid at all times. Not too sure how that would work out long-term.
So removing the plunger from one sounds like a fun project.
As opposed to just bypassing the solenoid which would be too easy to be called a project.
Anyway, timing light gets here Tuesday.
Last edited by BarryB72; Jun 13, 2020 at 09:37 AM.
Melting Slicks
Joined: Oct 2003
Posts: 2,077
Likes: 334
From: Dallas TX
St. Jude Donor '06-'09,'22,'25
Something else to consider, with the hot weather it could be your coil breaking down. They don't last forever, and the heat gets to them. I had similar problems and the coil and fuel filter were replaced yesterday... Runs great now.
Thread Starter
Drifting
Joined: Nov 2013
Posts: 1,806
Likes: 258
From: Dublin Ohio
Originally Posted by C6-CYa
Something else to consider, with the hot weather it could be your coil breaking down. They don't last forever, and the heat gets to them. I had similar problems and the coil and fuel filter were replaced yesterday... Runs great now.
Thread Starter
Drifting
Joined: Nov 2013
Posts: 1,806
Likes: 258
From: Dublin Ohio
TCS project done
By the way, I've driven it a couple times with the TCS out and it feels like someone dropped in an LT-1. Maybe a tired LT-1, but yeah, it runs nice.
Need to drive it on a hot day and see how the temperature compares.
By the way, I've driven it a couple times with the TCS out and it feels like someone dropped in an LT-1. Maybe a tired LT-1, but yeah, it runs nice.
Need to drive it on a hot day and see how the temperature compares.
Last edited by BarryB72; Jun 15, 2020 at 11:46 PM.
Thread Starter
Drifting
Joined: Nov 2013
Posts: 1,806
Likes: 258
From: Dublin Ohio
Man. Timing guns are fun.
Not exactly sure what the timing was on that hot day but now it's 16 initial, all in 36-37 @ 2600-2700 and I'm getting 15-16 vacuum advance so initial with vacuum is 32 and total with vacuum 52ish.
All of that seems to be within the parameters of Lars' suggested numbers.
Today I put initial down to 12 and took it for a drive and it did not respond well "off the line" so whether or not there is a hot start issue I think I'd rather have fun driving it and keep it in the garage on hot days if need be.
As to what it was set at on the day it wouldnt start- Because of the location of my vacuum advance canister hose and the distributor shield brace I can not go any more than 20 initial so I'm guessing I would have been at 18 when I nudged it up from 8 because I know I didn't have the hose touching the bracket.
Anyway, on different forums I've read that a hot engine is harder to start and an advanced engine is harder to start so it makes sense that it might not start in a perfect storm situation.
Still have half a tank of gas so have not got the ethanol free fuel yet but that is the next thing on my list.
Not exactly sure what the timing was on that hot day but now it's 16 initial, all in 36-37 @ 2600-2700 and I'm getting 15-16 vacuum advance so initial with vacuum is 32 and total with vacuum 52ish.
All of that seems to be within the parameters of Lars' suggested numbers.
Today I put initial down to 12 and took it for a drive and it did not respond well "off the line" so whether or not there is a hot start issue I think I'd rather have fun driving it and keep it in the garage on hot days if need be.
As to what it was set at on the day it wouldnt start- Because of the location of my vacuum advance canister hose and the distributor shield brace I can not go any more than 20 initial so I'm guessing I would have been at 18 when I nudged it up from 8 because I know I didn't have the hose touching the bracket.
Anyway, on different forums I've read that a hot engine is harder to start and an advanced engine is harder to start so it makes sense that it might not start in a perfect storm situation.
Still have half a tank of gas so have not got the ethanol free fuel yet but that is the next thing on my list.
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Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,094
Likes: 4,447
From: Marlton NJ
Gotta love early GM emissions controls and their "retarded" timing! Or should i just say "retarded" emissions controls? LOL