Bad Coils?

BeauRichardson · 05-13-2021, 08:34 AM

Alright, boosted (11 psi) , cammed, e85, lt4 high side and injectors, fore dual pump on the low side.

Car seems to run fine at idle, but at WOT it starts misfiring like nobody’s business. Breaking up, flashing CEL. The second i mat the pedal and it downshifts is when it starts. at least that what it seems like. might be a little after (like a second at the longest).

I have colder plugs, smaller gap, taylor wires. only thing else i could think of would be tune or ignition coils. i do have the msd 2-step as well.

how do i test coils? what do you think it is? anyone ever dealt with this issue?

Umbriel · 05-13-2021, 08:54 AM

If you are on full E85 you might be running out of fuel. Can you drop the boost a few pounds and see if it still does it?

Might want to post this in the Forced Induction section.

ctrlz · 05-13-2021, 10:34 AM

Quote:

Originally Posted by BeauRichardson

Breaking up, flashing CEL.

What is the code?
Coil packs would not be my first guess.
Since this is (right now) a wide open guessing game, I'll go with throttle position sensor problem.

Gunkk · 05-13-2021, 10:44 AM

Is it rich or lean at WOT.

That will narrow down where the problem is.

L78toLT1 · 05-13-2021, 11:15 AM

What's your high side pressure at WOT. My car missed and threw multiple codes when my hpfp went out. High side was around 2000psi and the curve was wery jagged looking, sort of like a compressed ekg. Normal is 2800 - 2900 with a nice, smooth curve

BeauRichardson · 05-13-2021, 12:36 PM

Quote:

Originally Posted by Gunkk

Is it rich or lean at WOT.

That will narrow down where the problem is.

it is extremely rich at idle, which is an issue that will have to be worked out with the tuner. as far as WOT, i’m not sure. I don’t log nor have a wideband gauge so here soon i’ll be getting hp tuners and a wideband so i can log, but next week i’m seeing the tuner so we can log what exactly is going on. luckily i don’t drive the car hard often, do to traction issues and the roads here in oklahoma.

BeauRichardson · 05-13-2021, 12:38 PM

Quote:

Originally Posted by L78toLT1

What's your high side pressure at WOT. My car missed and threw multiple codes when my hpfp went out. High side was around 2000psi and the curve was wery jagged looking, sort of like a compressed ekg. Normal is 2800 - 2900 with a nice, smooth curve

i’m unsure how i could log that, i do not have hp tuners, tuners, but i do have a code reader that does log. just don’t know what all of it means. what would it show up as?
I’ll be getting Hp tuners soon so i can log. but next week i’m seeing the tuner to log, since i don’t drive that much it’s not a timely matter

BeauRichardson · 05-13-2021, 12:40 PM

Quote:

Originally Posted by ctrlz

What is the code?
Coil packs would not be my first guess.
Since this is (right now) a wide open guessing game, I'll go with throttle position sensor problem.

it does have a tps code, but as far as i know, it’s just a permanent code that was thrown in the past and is just always going to show up. at least that’s what i was told by a previous tuner

BeauRichardson · 05-13-2021, 01:23 PM

Quote:

Originally Posted by Umbriel

If you are on full E85 you might be running out of fuel. Can you drop the boost a few pounds and see if it still does it?

Might want to post this in the Forced Induction section.

it’s not full e85 currently. it’s probably sitting around 60-65%
and thank you, i’ll post it there too

parish8 · 05-13-2021, 01:31 PM

Number one stop flooring it.

Almost for sure a fuel/tuning issue. You need a log with a wideband. Need to look at a/f, pw, fuel pressures...

ctrlz · 05-13-2021, 01:35 PM

Quote:

Originally Posted by BeauRichardson

it does have a tps code, but as far as i know, it’s just a permanent code that was thrown in the past and is just always going to show up. at least that’s what i was told by a previous tuner

So does it have a misfire code too???

BeauRichardson · 05-13-2021, 07:12 PM

Quote:

Originally Posted by parish8

Number one stop flooring it.

Almost for sure a fuel/tuning issue. You need a log with a wideband. Need to look at a/f, pw, fuel pressures...

i definitely stopped. the second it started that i let out

BeauRichardson · 05-13-2021, 07:13 PM

Quote:

Originally Posted by ctrlz

So does it have a misfire code too???

no sir, but the code reader live logs misfires, but doesn’t throw codes so i have no idea where it’s coming from. but it logged misfires way back before i was even cammed. just 6 psi boost in a procharger. and i changed my plugs multiple times, at many different gaps

Back To Pray · 04-01-2022, 03:26 PM

Quote:

Originally Posted by BeauRichardson

Alright, boosted (11 psi) , cammed, e85, lt4 high side and injectors, fore dual pump on the low side.

Car seems to run fine at idle, but at WOT it starts misfiring like nobody’s business. Breaking up, flashing CEL. The second i mat the pedal and it downshifts is when it starts. at least that what it seems like. might be a little after (like a second at the longest).

I have colder plugs, smaller gap, taylor wires. only thing else i could think of would be tune or ignition coils. i do have the msd 2-step as well.

how do i test coils? what do you think it is? anyone ever dealt with this issue?

I’m experiencing the same after installing a MSD 2step, except that it’s still flashing CEL and misfiring after removing the 2step.

What did you end up doing?

05-13-2021, 08:34 AM	#1
BeauRichardson Drives: 2019 Chevrolet Camaro SS Join Date: Apr 2021 Location: 405 Posts: 146	Bad Coils? Alright, boosted (11 psi) , cammed, e85, lt4 high side and injectors, fore dual pump on the low side. Car seems to run fine at idle, but at WOT it starts misfiring like nobody’s business. Breaking up, flashing CEL. The second i mat the pedal and it downshifts is when it starts. at least that what it seems like. might be a little after (like a second at the longest). I have colder plugs, smaller gap, taylor wires. only thing else i could think of would be tune or ignition coils. i do have the msd 2-step as well. how do i test coils? what do you think it is? anyone ever dealt with this issue?

05-13-2021, 11:15 AM	#5
L78toLT1 Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017 Location: North Ga Posts: 1,787	What's your high side pressure at WOT. My car missed and threw multiple codes when my hpfp went out. High side was around 2000psi and the curve was wery jagged looking, sort of like a compressed ekg. Normal is 2800 - 2900 with a nice, smooth curve __________________ Baby Blue 2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned

05-13-2021, 01:31 PM	#10
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	Number one stop flooring it. Almost for sure a fuel/tuning issue. You need a log with a wideband. Need to look at a/f, pw, fuel pressures... __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

05-13-2021, 08:54 AM	#2
Umbriel Drives: 2016 Camaro SS Join Date: Sep 2018 Location: Bartlett, TN Posts: 1,121	If you are on full E85 you might be running out of fuel. Can you drop the boost a few pounds and see if it still does it? Might want to post this in the Forced Induction section.

05-13-2021, 10:44 AM	#4
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	Is it rich or lean at WOT. That will narrow down where the problem is.

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