Bucking under acceleration
#16
Rennlist Member
Thread Starter
Thom, I saw your post about 2 hours AFTER I bought them from Lindsey...
I installed them today and it's fixed! My car actually feels like I just did a tune up. Definitely more responsive and I can finally feel the recent mods. The evergreen turbo, upgraded intercooler, lightened flywheel and lighter con rods = WOW!
I installed them today and it's fixed! My car actually feels like I just did a tune up. Definitely more responsive and I can finally feel the recent mods. The evergreen turbo, upgraded intercooler, lightened flywheel and lighter con rods = WOW!
#20
Rennlist Member
Wow, those wires look/sound very similar to the Clewett wires -- I wonder if LR makes them or buys them? Either way, they look good. The Clewett's are $85 for reference, plus I think $15 for special colors like Blue...
#21
Rennlist Member
Thread Starter
So, the same thing is happening again. At first, the new spark plug wires seems to fix the problem but now it's back. It only happens in 3rd - 5th gears when cruising at 3000 rpm then getting on it, it bucks as if a cutoff is happening at around 3800 rpm. I can floor it in first and second all the way to redline with no issues.
#22
Rennlist Member
So, the same thing is happening again. At first, the new spark plug wires seems to fix the problem but now it's back. It only happens in 3rd - 5th gears when cruising at 3000 rpm then getting on it, it bucks as if a cutoff is happening at around 3800 rpm. I can floor it in first and second all the way to redline with no issues.
#23
Rennlist Member
Thread Starter
I use an MSD ignition and I do have newish plugs, new blaster 2 coil and a newish rotor. Newish means within the last 18 months. My msd ignition is not new though. Is there a way to test those things to isolate what may need to replace?
#24
Burning Brakes
I noticed my cap and rotor wear more quickly now that I have an MSD blaster coil. I replace it once a year.
What's the plug gap? Do you know your AFR at full throttle?
What's the plug gap? Do you know your AFR at full throttle?
#25
Three Wheelin'
Test it and get back to us. If the MSD is at fault, it might be worth sticking with regular ignition. Just the MSD Blaster coil alone should probably suffice with your modifications, though you could always go wasted spark as well.
#27
Rennlist Member
Thread Starter
No spark! Failed the first test... I have the older MSD 6A. I did this test about 18 months ago and it sparked.
So what are your recommendations for replacement/reasonable upgrade?
So what are your recommendations for replacement/reasonable upgrade?
#28
Three Wheelin'
This would be simple to verify: do the same test with the MSD box bypassed (wire the primary ignition circuit as it was from the factory).
EDIT: the above test might not pass with the coil in 12V inductive mode. A better test would be to wire the ignition as stock and take it for a test drive and see if the symptom goes away. Make sure you set the spark plug gaps back to stock if you had opened them up for use with the MSD 6AL.
Last edited by Droops83; 12-31-2018 at 12:00 PM.
#30
Rennlist Member
Thread Starter
I did not install it, my old mechanic did it back in 2007, so what must I do to bypass the MSD and put back to stock?
Any other things that I need to consider?
Any other things that I need to consider?