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Discussion Starter · #1 ·
Hey all, looking for some additional feedback for my 2015 Chevy Cruze LS 1.8.
-This car has given me a handful of stress. I’ve been going through the motions of replacing intake & exhaust manifolds. Swapped out my ignition coil with an OEM, I’m also running NGK spark plugs. On top of parts I’ve purchased a trifecta tune to even out the air/fuel ratio. All this, & my Chevy is still running pretty rough when idling. I’m convinced it’s a misfire, pretty bad one at that. What else can I check to fix the issue? I’m considering doing a compression test.
 

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I had a bad idle issue I finally took to the dealer to sort out, they say they found broken wiring under the fuel tank, all I know is it runs a whole lot better!

Sent from my moto g(7) using Tapatalk
 

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2015 Chevrolet Cruze LT 1.4L Turbo
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Hmm. Normally misfires leave codes of some sort. You can try a compression test. OR It could be your engine mount(s) are worn out causing the engine to transmit vibrations to the body of the car causing symptoms that mimic a misfire?
 

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Discussion Starter · #6 ·
I'm convinced its a misfire because the car won't drive well. It "Coughs" & is very sluggish, barely made it up my hill to my garage. When idling, it hums at first and then the RPM needle starts to bounce around 1k
 

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Discussion Starter · #8 ·
UPDATE**
I took my car to the dealership to have them try and fix the issue. They fried an ignition coil & spark plug so I ended up paying for those, we removed the tune in my car & it ran okay stock for about 2 weeks before I started having a very rough idle & poor jerky acceleration. I was able to get some codes while getting my car home.
P0301
U0100
P0137
P2301
P2270

Any ideas guys?
 

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UPDATE**
I took my car to the dealership to have them try and fix the issue. They fried an ignition coil & spark plug so I ended up paying for those, we removed the tune in my car & it ran okay stock for about 2 weeks before I started having a very rough idle & poor jerky acceleration. I was able to get some codes while getting my car home.
P0301
U0100
P0137
P2301
P2270

Any ideas guys?
You have an electrical problem.

Cylinder 1 misfire
Communications error
O2 sensor low voltage
Ignition coil voltage
O2 sensor

Has your car had the negative battery cable replaced yet? If not, I'd start there. Special Coverage #14311: Negative Battery Cable. Once this is done, clear the codes and leave the stock tune on to see what happens.
 

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A bad ground could do that all of the above. It makes a good bit of difference.
 

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Discussion Starter · #11 ·
I never considered the negative battery cable. I figured electrical as well & bought a new preprogrammrd ECU that will be here in a few days, will update with results.

If the ECU doesnt help the ground cable will be my next bet.
 

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Discussion Starter · #13 ·
UPDATE:
-Plugs were installed by the dealer, i double checked the gap & they all check out.

-New ECU didnt fix my issue🤬 & i melted another ignition coil. Spark plugs looked fine & the coil melted after running smooth for 3min. Idfk

--My next move is to sell this POS, Im done! Sorry i couldnt come to a solution for you guys with the same issue. ✌🏾
 

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Discussion Starter · #14 · (Edited)
UPDATE:
-I didn't sell her quite yet. I replaced my VALVE COVER GASKET & have had no issues at idle. No codes, no bouncing needles, no burnt up coil packs. Ill be taking it for a drive in a bit but for anyone reading this discussion, check your valve cover gaskets FIRST! It's simple & I've wasted a couple grand when I just needed a $30 gasket.
 

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Your car has a breathing problem and since it's worse at idle.. pcv issue, exhaust restrictions, vacuum leak
UPDATE:
-I didn't sell her quite yet😄 I replaced my VALVE COVER GASKET & have had no issues at idle. No codes, no bouncing needles, no burnt up coil packs. Ill be taking it for a drive in a bit but for anyone reading this discussion, check your valve cover gaskets FIRST! It's simple & I've wasted a couple grand when I just needed a $30 gasket.😄
😉
 

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2015 Chevrolet Cruze LT 1.4L Turbo
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UPDATE:
-I didn't sell her quite yet😄 I replaced my VALVE COVER GASKET & have had no issues at idle. No codes, no bouncing needles, no burnt up coil packs. Ill be taking it for a drive in a bit but for anyone reading this discussion, check your valve cover gaskets FIRST! It's simple & I've wasted a couple grand when I just needed a $30 gasket.😄
Next time don't condemn the car so quickly. I'm guessing you paid good money for it. PATIENCE and GOOD DIAGNOSTICS go a long way. Especially with a Cruze.
 
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