tioga Posted December 29, 2018 Author Share Posted December 29, 2018 Never check the back three with a light. Yes load made a difference. Less throttle higher I could rev. This made it impossible to check timing at high rpm and see if it was moving around because it wouldn’t do it. Quote Link to comment Share on other sites More sharing options...
madkaw Posted November 5, 2019 Share Posted November 5, 2019 (edited) Okay - I am in the same boat here and I’m glad you posted . A while back I had a misfire issue that was very hard to diagnose . It was the spark plug wires were leaking and cross firing . These were genuine GM wires that weren’t very old . It took forever to figure out . Put a new set Magnacore on there and fixed it Now I have put a bigger motor in and have a high compression build I am having issues again. #6 is fouling for no apparent reason . I swapped everything possible , coils, wires, plugs, injectors - nothing helps . 225 cylinder pressure , good leak down test, good coolant pressure test . Getting ready to install a zx dizzy and wires to check to see how things go . I think these smart coils trigger to easy . #6 coil sits right above my starter . Maybe proximity is going to be the issue . If not I have a hardware problem - like piston ring ? Edited November 5, 2019 by madkaw Quote Link to comment Share on other sites More sharing options...
Chickenman Posted November 10, 2019 Share Posted November 10, 2019 Don't think you have a engine internal problem Stephen. Other than possibly a slightly leaking oil seal on #6. But I don't think that is the main issue. Funny, I was just thinking about coils on your FB thread. Seems you had a lot of problems with those COP's. Going single coil with dizzy should be a good way to check to see if its' anything related to the coils. And yes, D585 coils are sensitive to EMI and electrical noise from large ground loops. . It can trigger Auto Discharge. One of the big things is that the Main ground for the GM Coils ( Not the Trigger ground ) MUST be grounded to the cylinder head. Grounding elsewhere creates a larger ground Loop and thus more EMI. Might be a good idea to double check the ground wires on all of the coils. Especially #6. Also had a couple of thoughts on the injector drivers in your FB thread. Quote Link to comment Share on other sites More sharing options...
madkaw Posted November 10, 2019 Share Posted November 10, 2019 7 minutes ago, Chickenman said: Don't think you have a engine internal problem Stephen. Other than possibly a slightly leaking oil seal on #6. But I don't think that is the main issue. Funny, I was just thinking about coils on your FB thread. Seems you had a lot of problems with those COP's. Going single coil with dizzy should be a good way to check to see if its' anything related to the coils. And yes, D585 coils are sensitive to EMI and electrical noise from large ground loops. . It can trigger Auto Discharge. One of the big things is that the Main ground for the GM Coils ( Not the Trigger ground ) MUST be grounded to the cylinder head. Grounding elsewhere creates a larger ground Loop and thus more EMI. Might be a good idea to double check the ground wires on all of the coils. Especially #6. Also had a couple of thoughts on the injector drivers in your FB thread. I started a thread #6 fouling. I swapped to a zx dizzy and nothing changed Quote Link to comment Share on other sites More sharing options...
madkaw Posted August 17, 2020 Share Posted August 17, 2020 On 12/29/2018 at 10:09 AM, tioga said: Never check the back three with a light. Yes load made a difference. Less throttle higher I could rev. This made it impossible to check timing at high rpm and see if it was moving around because it wouldn’t do it. I keep rereading this thread because I am sure I am experiencing the same thing. At around 6700 rpm my engine starts to get louder and not smooth and looses power. This shouldn't be happening with this motor. I will get fouling of 5&6 . It will clear off during normal driving . Can't see anything during datalogging . Looks like you went different coils? looks like Audi COPs? I guess I need to go this route to be sure . There doesn't seem to be any other reason this could be happening. Quote Link to comment Share on other sites More sharing options...
tioga Posted August 17, 2020 Author Share Posted August 17, 2020 You should be able to close the plug gap down and see a difference in rpm where the break up occurs if it’s exactly the same issue. Quote Link to comment Share on other sites More sharing options...
madkaw Posted August 17, 2020 Share Posted August 17, 2020 Cool- I’ll try that. I was wondering if I could somehow see it on a trigger log , but they are limited on size . Quote Link to comment Share on other sites More sharing options...
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