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Old 05-02-2018, 11:27 PM   #1
Zee-Ell-One
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Please Help!! 2013 ZL1 LSA Powered Misfire/Pop Problem

I have an intermittent misfire/hesitation on my 2013 LSA powered Camaro ZL1. Only mod is a Hooker cat back 3" dual exhaust with xpipe no mufflers and a K&N drop in filter no tune.

It seems to be limited to and occur only after a long coast down a canyon with sustained low RPM engine braking. When it's time to accelerate again seems if I give it a decent amount of throttle starting from 2000 RPMish and put a good load on it I get a Misfire/Pop at about 3000 RPM. Then it seems to be okay again until I repeat a similar scenario.
Any ideas, suggestions, solutions would be much appreciated.
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Last edited by Zee-Ell-One; 05-05-2018 at 01:32 AM.
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Old 05-03-2018, 07:32 AM   #2
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Dirty MAF sensor, cracked plug or wires, bad fuel or delivery.
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Old 05-03-2018, 12:32 PM   #3
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Are u actually logging a misfire, or are you assuming this because of the popping sound.

I'm willing to bet it is un burnt fuel in the exhaust system firing off when you give it throttle after deceleration.

With no mufflers, and a larger exhaust without a tune, I'm sure you are running a little richer than ideal.
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Old 05-04-2018, 02:48 PM   #4
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Mine did that when I pulled the fuse. There is a deceleration table that regulates the fuel during that period. You can have it tuned out if you don't like it. Once I did the headers, the popping snorting sounds were even louder...
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Old 05-05-2018, 01:28 AM   #5
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Quote:
Originally Posted by VRZL113 View Post
Are u actually logging a misfire, or are you assuming this because of the popping sound.

I'm willing to bet it is un burnt fuel in the exhaust system firing off when you give it throttle after deceleration.

With no mufflers, and a larger exhaust without a tune, I'm sure you are running a little richer than ideal.
Thank you for your response!
I am not logging a misfire I don't have that telemitry capability yet. The pop is accompanied by a hesitation so it's definately a disruption in the cylinder combustion process.
I do have more black soot at the tailpipes between washes than before the exhaust swap. Does opening up the exhaust typically induce a rich condition? Is a misfire a symptom of being too rich? Is a rich condition harmful to the engine or is too lean harmful or both?
I'm full of these questions because I'm a novice DIY mechanic. I have a pair of long tube headers in the box waiting to be installed and that is why I have been stalling on getting a dyno tune.
Any and all advice is very much appreciated. Thank you Forumers.
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Old 05-05-2018, 02:23 AM   #6
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Quote:
Originally Posted by NVRL8 ZL1 View Post
Mine did that when I pulled the fuse. There is a deceleration table that regulates the fuel during that period. You can have it tuned out if you don't like it. Once I did the headers, the popping snorting sounds were even louder...
It's not the deceleration crackle. It actually hesitates and pops upon acceleration. I assume you are talking about having pulled the exhaust valve fuse? Did your car actually misfire and hesitate?
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Old 05-05-2018, 02:27 AM   #7
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Quote:
Originally Posted by JB'sZL1 View Post
Dirty MAF sensor, cracked plug or wires, bad fuel or delivery.
Do you have experience with this on an LSA engine? I did change the plugs today but haven't driven it yet.
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Old 05-06-2018, 08:50 PM   #8
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Quote:
Originally Posted by JB'sZL1 View Post
Dirty MAF sensor, cracked plug or wires, bad fuel or delivery.
I changed the plugs and solved the problem thanx! Runs stronger especially on low RPM also idles better and fuel mileage increased. At only 18,000 miles the plugs were shot they looked pretty bad compared to a new plug. I must admit my 18,000 miles is probably more equal to 50,000 miles from a daily driver. There was alot of wide open throttle driving in those miles.
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Old 05-07-2018, 02:13 PM   #9
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That's great you fixed it. The answer to your questions would have been, yes with the fuse pulled, no to the miss fire/hesitate, and yes, I found I have much more soot on the tips. I have a DIY mild to wild switch, and I leave it open 90% of the time.

And get those headers on, the car will sound fantastic....
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Old 05-08-2018, 12:21 PM   #10
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Great news. Glad you got her fixed.

Keep in mind, running too rich can eat up plugs. Were they all black and sooty looking?

Not saying this is def what happened, but I'd keep an eye on everything. Un-tuned with exhaust mods, can change up the air/fuel mixture some.
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