Heat soak issues. So the car spins a little slow, but starts fine, when the engine is cold. Example. Monday, I went to a store, that sales lunch plates. Grate food, and inexpensive too. Car was cold, when I left in it. Let it warm up to 160+ and go into open loop, as Holley says to do, with the sniper EFI. Left home, and drove about 7 or 8 miles. Got there, and went inside to get a lunch plate. Took maybe 5 mins max. When I got there, a guy in a truck, was admiring my Vette. Came back to start it, and the starter spun very slowly. Pulled the volts down to 9 volts. Back to around 12 volts, when I let off of the key. So, I put my window down, and asked the guy, if he had a set of jumper cables. He said, no, but I have a jump box. OK, perfect. I hook it up to the battery. It showed 12.8 volts. Turned the key, and again, dropped to 9 volts. Released the key, and back to 12.5 volts, and now his jump box is at 85 percent. Was at 100 before I hooked it up. I let it sit for about 1 min, and the jump box is back at 100 percent. Try again. 12.8, until I turn the key, and 9 volts with the key in the start position. After 2 attempts, I didn't want to hold this guy up, so, I said, don't worry about it. I will get it started . I open the hood, and double check the wires on the alt. All good there, no to mention, I was at 13.0 to 13.5 before I stopped at that store. So after sitting and fooling with the car, for about 5 mins are so, it fires up. Starter was spinning closer to normal speed. I put the car in the back yard, and go eat my lunch. Come out, once I'm done, and it starts decent. Still a little slow, on spinning the engine, but not bad. So, now I'm experimenting with the issue. Once I start it, again, I let it run to 195ish. Turn it off. Then try to start it. Starter spins slow, but the car does start. I do it again, and back to the very slow spin, ( about 1 revolution of the flywheel) and it stops, then a few seconds later, a 1/2 a revolution of the fly wheel, then it stops. All the while back to 9 volts. So again, I pop the hood, and let it sit for about 15 mins. The car starts. Not a fast spinning start, but fast enough to fire up the engine, and 11.5 to 12 volts. I got in it this morning, and fired it up. Volts fell to 12.5. pulled it out, put it on ramps, and went got some heat blanket for starters. I could not get it around the starter, BC of the metal heat shield, that is on the starter, and against the header. So , I decided to wrap the header. After doing that, I do the same test. Get it up to 195ish. Same situation. Would not spin the engine fast enough to start. I leave for about 2 hours. While I'm gone, my wife gets in the car, and starts it up, to move it so she can cut the grass. It starts fine. I replaced the battery in the car last month. Battery cables look fine. No corrosion. Keep in mind that all C3 Corvettes battery's, are in the floor, behind the driver's seat. As for the starter, this is the one I am talking about. It fits a 1999, to 2004, I think 4.3L Silverado, a 4.3L S10, a 4.3L Isuzu, and IDK what all else. These starters, are smaller than a 350 starter. I think I will go to the junk yard tomorrow, and get 1. That way, if it doesn't pan out well, I won't have lost much money.
