you said the problem started when you turned down the idle, have you tried turning the idle back up to see if it'll will run? If it doesn't I'd try a new coil
Engine won't idle
- Thread starter 88olds421
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The camshaft is a lunati bracket master II it has 230 degrees duration at .050 lift and .480 lift on both intake and exhaust. It does cut off at 1800 or so rpm's Should I try the 5.5 power valve or go with a 4.5.
Thanks
Thanks
4.5 might be too far. Your cam is just a bit "smaller" than the one I was dealing with so I think a 5.5 would be OK. You might try either Barry Grant or Holley tech support just to be sure. Have you hooked up a vacuum gauge to get an idea of what ballpark you're in? That might be helpful to the tech support guys
when I was on the phone, one of the many times with the demon guys, he said a 6.5 would probably be fine. I have not had the engine running at idle so I haven't got a read from a guage. I can always just hook one up and see what the reading is as I crank the engine. I have a good feeling you are right on since I was steared away from th vacuum secondary holley since it would have low vacuum. Also when I checked the plugs they all smelled like gas.
when I was on the phone, one of the many times with the demon guys, he said a 6.5 would probably be fine. I have not had the engine running at idle so I haven't got a read from a guage. I can always just hook one up and see what the reading is as I crank the engine. I have a good feeling you are right on since I was steared away from th vacuum secondary holley since it would have low vacuum. Also when I checked the plugs they all smelled like gas.
I tried a 4.5 and 3.5 power valve in the holley today. The engine still would not idle. It would still just fire a few cylinders than quit. I got it running at 2000 rpm and it ran like a champ and sounded great. Once it was running I brought it up to 3000 and checked the total timing and it was at 37 so I backed it down to 35. I had a vacuum guage on it as well and it was readding at 24 inches of vacuum. When I backed it back down to 2000 it was at 22 inches of vacuum. After it cut off when I tried to adjust it below the 1800 mark it cut off. I check a couple plugs and they were a little black. I tried to start is back at a normal idle and it would still just fire a few cylinders and then quit. I have all of the vacuum ports plugged in the carb. I am at a loss with what the issue could be.
Have you adjusted the idle mixture screws? If not, run them all the way in, then back them out 1 1/2 turns for a primary setting to get it running. Then adjust. In for leaner, out for richer.
The idle mixture screws are 1.5 turns out. I actually got the engine to idle at 500 rpm's which is good. At 500 rpm the engine has between 8 and 10 inches of vacuum. The 3.5 power valve is in the carb. The odd thing is that the timing is at 2 degrees after tdc, when I try to advance it or increse the idle the engine shuts off.
Man, I'm baffled. The timing thing(ATDC) is really weird. Have you verified your timing marks? There are 2 different timing cover/balancer combinations. One has the marks straight up(viewed behind the water pump) and one at the 2 o'clock position. I'm wondering if you might have a mismatch or possibly a balancer with a spun ring. It's important because if you can't dial in the timing no amount of carb tuning will make it run right.
You know what they say; if you think its fuel - it's spark, if you think it's spark - it's fuel
. Keep us posted.
You know what they say; if you think its fuel - it's spark, if you think it's spark - it's fuel
. Keep us posted.- Status
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