60lbs & idle misfire - Cobalt SS Network

2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

60lbs & idle misfire

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Old 08-08-2018, 11:03 PM
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60lbs & idle misfire

i put some 60s and zzp tune on, it runs pretty smooth, its not super rich at idle and i dont get the hesitation between shifts anymore.

i do feel it misfiring at idle, and i've gotten the code recently.

but to be fair it did this before with the gm tune and 42s

ive tried all the normal **** to fix it,

fuel filter, plus, coils, check for vacuum leaks, clean maf, clean TB, new o2 sensors, uh probably other stuff...

dunno what else it can be
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Old 08-08-2018, 11:39 PM
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you wont get 60lb injectors to idle perfect with a canned tune. i find every car needs some finesse to make it work. i also had issues with my zzp tune years back with idle quality that stemmed down to what they did with the throttle body settings. not saying this is for sure whats going on, being you had idle issues before.

you didnt mention what plugs you were running, colder plugs dont help with idle quality, and neither does a tight plug gap. both things are needed for making more power, its sort of one of the tradeoffs we have to make.
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Old 08-08-2018, 11:45 PM
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Yeah from my experience you're spot on.

I have one step colder plugs and they're gapped fairpy tight around 32-35

It did idle better with a large gap 40-45

I mean it doesn't idle that bad... But it's annoying throwing a code. If it didn't throw a code I wouldn't care. I wish it couldve been turned off
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Old 08-09-2018, 12:18 AM
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32-35 is a little tight for a 3.0 pulley, and really you could almost get away with stock heat range plugs.
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Old 08-09-2018, 12:30 AM
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When I had them around 40 it wouldnt rev over 6900-7000.


​​​​​​I'd probably try normal heat range and see if that helps at all
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Old 08-09-2018, 12:56 AM
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whats your limiter set at?

if at 40 it wont rev that high, try 38. a slight change can make a big difference
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Old 08-09-2018, 01:21 AM
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7200 is the rev limit.

i really dont think it makes any real difference in acceleration if i shift at 6900 or 7200. but its lame having it fall on its face.

its seems hard to get the gaps perfect. i set them and when i take the plugs out they all change in random directions.

i think they're about 35-38 right now. i'm not using normal feeler gauges i have one of those shitty round plug gap tools
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Old 08-09-2018, 06:02 PM
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one weird thing i noticed about my ZZP PCM is that the gas mileage readout is way off. its like it still thinks there are 42s in there but they are spraying at a much lower %.

cruising at 65mph its showing like 45mpg, before it was saying 33ish

i dont know that much about hptuners is there some setting for this
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Old 08-09-2018, 06:14 PM
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Once you tune the car the DIC isnt accurate anyway. Not 100% sure but I think they calculate fuel flow based on injector open time with stock injector size.
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Old 08-09-2018, 06:15 PM
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with the GM stg 2 tune and the 42s i checked it manually and it was accurate. its not a big deal but i wanted to use it to see if there was a mileage difference between the tunes / injectors

i can do it manually
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Old 08-09-2018, 11:28 PM
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the fuel mileage is calculated by the bcm using the injector pulse width. being hp tuners only tuned powertrain, we cant fix the mileage calculations

in cars that had the gm stage 1 or 2 tune flashed from gm, the fuel mileage reading would be correct for 42lb injectors as gm updated the bcm.
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Old 08-09-2018, 11:28 PM
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Gotcha
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Old 08-12-2018, 02:39 PM
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There are no parts you can throw at the car that will tune it for everyday driving. You need to take it to a tuner that understands drivability and can dial in your long term fuel trim. I would say there are fewer of those than tuners that can tune for WOT. There are tuners here in Denver that will take $500.00 from you to tune on the Dyno and the car will run like crap at start-up till it goes into closed loop. FYI: Closed loop tuning is best done on the street. It's easy enough to pull off the road, adjust and drive some more. The tuner needs to know where fuel enrichment comes in or they will mess up the Fuel Enrichment settings.

When your tuner has it dialed in your LTFT will not budge in closed loop.


Last edited by HGT; 08-13-2018 at 01:37 PM.
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Old 08-13-2018, 01:03 PM
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