Well, I went to fire her up and...

Can'tHave2MuchHP · 02-28-2021, 06:53 PM

Good evening gents.

I know, it's been a while right? Well, I'm back

.

Anyways, I went to fire up the ZL1 after probably 4 months of sitting. Fired right up, battery health perfect, everything checked out under the hood etc. I drove it about 2 miles around the block when the dash lights up like a Christmas tree. Service stabilitrak, service rear axle, and flashing check engine light. Car didn't sound right. Luckily I had been babying it, using hardly any throttle. I continued this to baby it home.

Got out my code reader. Code P0304. Misfire on Cylinder 4. Very rough idle, vibrations, surging, etc. Cleared the code, came right back. Opened the hood to start checking injectors, plug wire, etc. but it was WAY too hot under there. Plus I was a bit frustrated having issues on a basically brand new car so I bailed and went inside until it cools off.

What should I check for when I get back out there? I'm 1% worried that I had to drive it probably 4 miles total with the engine running in that state, I kept it ultra low load/RPM. I can get my flatbed to take it to the dealer but I'd prefer not to if I can find the problem in my garage.

Thanks guys.

Joshinator99 · 02-28-2021, 07:17 PM

The misfire will cause the other codes, like Stabilitrak, to pop up too. Could be a few things: plug wire, plug, injector, etc. If it’s under warranty I guess it’s an easy choice of what to do...

PROMETHEUS · 02-28-2021, 08:14 PM

Had the same thing happen to me on Cylinder #1. Turned out to be a fouled plug. Dealership replaced under warranty.

EvilZL · 02-28-2021, 08:24 PM

Check plug wires when your motor cools down. If you can't find the problem and you still have warranty, maybe let the dealership figure it out?

grampa_ss · 02-28-2021, 08:31 PM

Check for corrosion in the coil packs/connectors. That happened to me after sitting for 2 months.

Bangkok_ZL1 · 02-28-2021, 08:53 PM

Quote:

Originally Posted by Can'tHave2MuchHP

Good evening gents.

I know, it's been a while right? Well, I'm back

.

I drove it about 2 miles around the block when the dash lights up like a Christmas tree. Service stabilitrak, service rear axle, and flashing check engine light. Car didn't sound right. Luckily I had been babying it, using hardly any throttle. I continued this to baby it home.

Got out my code reader. Code P0304. Misfire on Cylinder 4. Very rough idle, vibrations, surging, etc. Cleared the code, came right back. Opened the hood to start checking injectors, plug wire, etc. but it was WAY too hot under there. Plus I was a bit frustrated having issues on a basically brand new car so I bailed and went inside until it cools off.

What should I check for when I get back out there? I'm 1% worried that I had to drive it probably 4 miles total with the engine running in that state, I kept it ultra low load/RPM. I can get my flatbed to take it to the dealer but I'd prefer not to if I can find the problem in my garage.

Thanks guys.

Yeah, What's up with that???? Only visit us when you need us? How dare you, LOL. Sorry it took a code to get you back here.

I'm definitely not a fan of the way this ZL1 does this code thing. I hope I don't have to deal with this for a very long time, if ever..... Especially since I'm doing all of these long trips away from my garage. Hope you get it figured our shortly so you can get back on the road.

Gunkk · 03-01-2021, 09:25 AM

Rats chew on anything?

EDFHOBBIES · 03-01-2021, 10:13 AM

I bet anything its a bad injector.. 3 so far everytime its the injector it's never been a coil pack or wire for me.

Realist · 03-01-2021, 10:41 AM

Welcome back!

Interested in seeing resolution.

Crushed 1LE · 03-01-2021, 11:24 AM

Valve spring?

az4783054 · 03-01-2021, 11:48 AM

Four months of sitting usually has an impact on the battery if not on a maintenance charger. Since it 'fired right up', electrical related to a discharged battery can probably be eliminated.

Rodent damage was my first thought. Any indication of rodent nesting in the garage or under the hood?

Did you check the plug wire connections at the coil(s)? Did you put any fuel stabilizer into the tank before it was stored?

https://www.obd-codes.com/p0304

Indyblue98 · 03-01-2021, 01:34 PM

Maybe Ethanol in gas went bad ?

I rarely drive my ZL1 , so make sure only Pure Gas no Ethanol .

Ruined a couple small engine carbs before I learned my lesson .

Revalot · 03-01-2021, 02:21 PM

Marine grade stabile is the best ! 3× stronger than the red, You can put a drop on ethanol crust build up(a wire brush will not clean it all off), and it wipes off like butter !

SJFGTO · 03-02-2021, 06:48 AM

If it drove fine before it sat, the most likely variable is 4 months of inactivity. My wild guess is the fuel sitting in the tank. Water, dirt, a bit of corrosion. I might consider just filling up the tank with fresh gas, let it idle for a while, take it out on the road and burn off the old gas as diluted by the fresh fuel. Just a wild guess.

02-28-2021, 07:17 PM	#2
Joshinator99 Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 4,749	The misfire will cause the other codes, like Stabilitrak, to pop up too. Could be a few things: plug wire, plug, injector, etc. If it’s under warranty I guess it’s an easy choice of what to do... __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion *1059 WHP/944 WTQ, 9.48@150*

02-28-2021, 08:31 PM	#5
grampa_ss Drives: 2016 Camaro 2SS Join Date: Apr 2017 Location: Stansbury Park, Utah Posts: 1,092	Check for corrosion in the coil packs/connectors. That happened to me after sitting for 2 months. __________________ 2016 2SS, MRC, NPP, A8. Procharger P-1X,Stage II,std bypass, 3.9, Alky Meth - 10.84 @129 - DA+2000 New Mods - GPI drop ins, Kooks 2", LT4 fueling, Cam, Circle D Converter, 3.5 pulley & dual nozzle meth.

03-01-2021, 10:13 AM	#8
EDFHOBBIES Dyno Show Queen LOL Drives: 16 SS & 17 ZL1 Both Yellow Join Date: Jan 2014 Location: Houston Posts: 4,345 View My Garage	I bet anything its a bad injector.. 3 so far everytime its the injector it's never been a coil pack or wire for me. __________________ Kong Ported 2650, Crawford Racing Port Injection, Weapon X 112mm Adapter, NW112mm TB, Livernois Ported LT4 Heads, Lingenfelter GT32 stealth cam, Haltech Elite, and Carbon by Trufiber

03-01-2021, 11:48 AM	#11
az4783054 Drives: SWXXZL1 Join Date: Jul 2020 Location: the corrupt purple state of az Posts: 150	Four months of sitting usually has an impact on the battery if not on a maintenance charger. Since it 'fired right up', electrical related to a discharged battery can probably be eliminated. Rodent damage was my first thought. Any indication of rodent nesting in the garage or under the hood? Did you check the plug wire connections at the coil(s)? Did you put any fuel stabilizer into the tank before it was stored? https://www.obd-codes.com/p0304 __________________ "Joe" does a hilarious impression of a slinky toy on stairs.

03-01-2021, 01:34 PM	#12
Indyblue98 2012 RS 2ss Drives: 2018 ZL1 2012 2SS WhippleCharged Join Date: Feb 2012 Location: Kansas Posts: 414	Maybe Ethanol in gas went bad ? I rarely drive my ZL1 , so make sure only Pure Gas no Ethanol . Ruined a couple small engine carbs before I learned my lesson . __________________ 2018 ZL1 A10 and 2012 2SS RS Whipple-Corsa-RotoFab-ZL1 Diff 3.73 Pfadt ZL Stage 3 Suspension+

02-28-2021, 06:53 PM	#1
Can'tHave2MuchHP Drives: Fast Join Date: Mar 2015 Location: Michigan Posts: 3,696	Well, I went to fire her up and... Good evening gents. I know, it's been a while right? Well, I'm back . Anyways, I went to fire up the ZL1 after probably 4 months of sitting. Fired right up, battery health perfect, everything checked out under the hood etc. I drove it about 2 miles around the block when the dash lights up like a Christmas tree. Service stabilitrak, service rear axle, and flashing check engine light. Car didn't sound right. Luckily I had been babying it, using hardly any throttle. I continued this to baby it home. Got out my code reader. Code P0304. Misfire on Cylinder 4. Very rough idle, vibrations, surging, etc. Cleared the code, came right back. Opened the hood to start checking injectors, plug wire, etc. but it was WAY too hot under there. Plus I was a bit frustrated having issues on a basically brand new car so I bailed and went inside until it cools off. What should I check for when I get back out there? I'm 1% worried that I had to drive it probably 4 miles total with the engine running in that state, I kept it ultra low load/RPM. I can get my flatbed to take it to the dealer but I'd prefer not to if I can find the problem in my garage. Thanks guys.

02-28-2021, 08:14 PM	#3
PROMETHEUS Drives: 2019 ZL-1, Shadow Gray, Sold Join Date: Jan 2019 Location: Fredericksburg, VA Posts: 1,390	Had the same thing happen to me on Cylinder #1. Turned out to be a fouled plug. Dealership replaced under warranty.

02-28-2021, 08:24 PM	#4
EvilZL Drives: 2018 Camaro ZL1 Join Date: Sep 2020 Location: Michigan Posts: 251	Check plug wires when your motor cools down. If you can't find the problem and you still have warranty, maybe let the dealership figure it out?

03-01-2021, 09:25 AM	#7
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	Rats chew on anything?

03-01-2021, 10:41 AM	#9
Realist Drives: No Camaro :( Join Date: Apr 2013 Location: Chitown Burbs Posts: 1,136	Welcome back! Interested in seeing resolution.

03-01-2021, 11:24 AM	#10
Crushed 1LE Drives: 2022 ZL1(FEA suspension) Rapid Blue Join Date: Apr 2019 Location: Chemainus BC, Canada Posts: 489	Valve spring?

03-01-2021, 02:21 PM	#13
Revalot Drives: ZL1/1LE parts added Join Date: May 2018 Location: Somewhere around Texas pines tress and smooth asphalt Posts: 609	Marine grade stabile is the best ! 3× stronger than the red, You can put a drop on ethanol crust build up(a wire brush will not clean it all off), and it wipes off like butter !

03-02-2021, 06:48 AM	#14
SJFGTO Oh Oh it's Friday Night! Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018 Location: Walton Woods Posts: 1,061	If it drove fine before it sat, the most likely variable is 4 months of inactivity. My wild guess is the fuel sitting in the tank. Water, dirt, a bit of corrosion. I might consider just filling up the tank with fresh gas, let it idle for a while, take it out on the road and burn off the old gas as diluted by the fresh fuel. Just a wild guess. __________________ 2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm Four that wanna own me Two that wanna stone me One says she's a friend of mine...

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