Popeye775

Huge breakthrough when it comes to the car and how it runs. So here's what I did. I decided to try and increase the gap .001 to see what would happen. From .025 -> .026. The car loved it. It idled a lot better and even revved a lot better. I did mess with the CO Pot a little bit more, but ended up putting it right back to 517 ohm like it was before. It definitely is still missing a little bit, but not like it was just a couple days ago. I am going to try to increase the gap again to .027 and see if that completely solves the issue as well. Tomorrow I will also be installing - or working on installing - that wideband gauge in order to properly dial in the air/fuel mixture. Although it feels pretty good mixture wise currently and the plugs are reflecting that a bit.

We will also find out this weekend how it’s running. I just got my wideband gauge in and will be installing tomorrow Sent from my iPhone using Tapatalk

Minor update: got the car smoke tested. It has zero vacuum leaks and zero boost leaks. So I’m assuming either just needs to be tuned more, or possible ground issue? Sent from my iPhone using Tapatalk

So i set it to 500 ohm and adjusted the idle air screw accordingly. Due to the advancement in timing that I did the other day, I still needed to up the ohms to take some fuel out to drop the idle a bit. Gonna rest drive in a bit and give an update Sent from my iPhone using Tapatalk

No sir. The problem also doesn’t get worse as the car warms up. It is pretty consistent usually Sent from my iPhone using Tapatalk

Advice real quick here: So I am considering trying this. I was adjusting the CO Pot today along with the idle air screw, but I am thinking that what I should do is set the CO Pot back to 500, then set the idle air screw from there and then set the CO Pot accordingly for that. Would this be a good way to go about trying to tune this thing or not? I am going to order a wideband as well because I think that will help a lot when it comes to trying to get this thing dialed in 100%

Update: Took the car out for a little drive again - i have not pulled the plugs yet - and it still feels misfire-like under 2k rpm but it is off and on. It does it on take off and what seems to be under that RPM of 2k. Something new, when I turned the car back on after driving it for a while then letting it sit a couple minutes, it idled perfect and revved perfect for about 30 seconds then went back to it's misfire-like ways under 2k.

Awesome, I will turn the CO pot down more then. I know that the timing and spark plug gap are good, so I will work with the CO pot to richen it up! Thank you sir

Plugs after most recent run. One plug looks a little whiter than the others that’s for sure but they are looking better. Sent from my iPhone using Tapatalk

That was the best drive it’s had in a long time. The only spot I really felt a miss (other than a tiny bit on takeoff) was in third gear if I went full throttle around 2.5k rpm Sent from my iPhone using Tapatalk

So I did some research and from what it seems the CO pot should be set to 500ohm. That way it isn’t pulling or adding fuel. So what I did was set mine to 500ohm and I will see how it feels from that adjustment Sent from my iPhone using Tapatalk

When it comes to adjusting the CO pot, do you do it while the car is on or off? Also I’m assuming in 1/4 turn increments clockwise? Sent from my iPhone using Tapatalk

The 268 cam is not yet in there. I am waiting on a valve cover gasket to get here before I can put it in. So when I say burbly or missy I mean it sounds like it is stuttering and it lacks acceleration. Basically like it is hesitating. Here is an old video that has the sound captured pretty well. You can hear as soon as I go to rev the car, there is a burble like sound. https://www.youtube.com/watch?v=4AOgdg1Hsps

Update: I just took it out after the gap being at .025 and increasing the timing by about one degree. It felt really good. It misfired a little full throttle at first but then stopped doing it after a couple pulls. It also didn't feel like it was missing while cruising. At least if it was, then I didn't feel it. Under 2k it was a little missy or burbly taking off unless I blurped the throttle. I am assuming there is a boost leak or vacuum leak somewhere causing it to do that because it wasn't consistent. But that is the best it has felt in a long time. Do you think I should decrease the gap back down to .024 and try it that way or take a look at the plugs first and figure out where to go from there? PS: I will post a photo of the plugs here in a little once the car cools off a little bit.

Awesome sounds good sir! Thank you so much for all of your constant help

The timing is set for 6 degrees BTDC currently. I only increased the plug gap by .001 (.024 - .025) so I didn't compromise the fuel igniting under boost. Advancing the timing maybe like one degree? Maybe two?

Here’s a drive on 4bar fuel pressure and .024 gap. Felt good shifting in boost but felt a little misfire-ish cruising. So I might increase gap to .025. Am I going about that the right way? Sent from my iPhone using Tapatalk

Perfect! I will turn it up to 4bar with the vacuum unplugged and see what it does. Thank you sir! Sent from my iPhone using Tapatalk

So I am running a 3-5 bar fuel pressure regulator so I could turn up the fuel pressure. My CO pot is set to a resistance of 550 ohms, what would you say this should be turned up to? Or should I turn the fuel pressure to 4bar and leave the CO pot where it’s at? Sent from my iPhone using Tapatalk

New development as well. Took her back out again after regapping plugs. Car started right up, and this time if I eased into boost going into third, there wasn’t any misfire action. But if I shifted into third and immediately went foot down, then it misfired. Sent from my iPhone using Tapatalk

Here are the plugs. I dropped the gap on them because they were at .029. I also did a voltage test on the harness connector going to the distributor as well as a voltage test on the grounds. I am going to do a voltage drop test later to make double check the grounds as well. Sent from my iPhone using Tapatalk

It sounds like I won’t have access to a smoke tester until next weekend. So in the meantime, would it help to go ahead and pull the plugs and I will post them up? Sent from my iPhone using Tapatalk

Ok I just wanted to be sure o had the fuel pressure set correctly. Sent from my iPhone using Tapatalk

Now this may also be a dumb question but when adjusting the fuel pressure up for the chip - since it needs 3.5 bar - , is it 3.5 bar with the vacuum line plugged in or unplugged because I saw someone say with it unplugged but want to double check this Sent from my iPhone using Tapatalk

Sounds good! Tomorrow I am also going to check for weak spark. Sent from my iPhone using Tapatalk