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Potential Tuner
Only 5psi bad misfire
2008 cobalt ss ldk swap on S256
The car is missing really bad after about 6psi it falls on its face after a few drives got a random misfire code.
note* car ran fine for the first 2 days this started happening on the third day (brand new engine/sensors/everything)
1. tried changing coils & plugs
2. compression dead even on all cylinders
3. boost leak tester no leaks at 25psi
4. gapped spark plugs
run after exhaust.hplrun home.hpl
Mods:
86mm wesico pistons
K1 rods
ZZP Turbo Piping
Bigger fuel pump lobe
Lt1 fuel pump
balance shaft delete
Opels
S257
Tr10 intercooler
38mm wastegate
Blow off valve
Full exhaust (catted)
Upgraded map sensors
E47
Stage 3 clutch masters
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Advanced Tuner
1st off your fuel trims are pegged lean at idle so you need to verify that you do not have any vac leaks and fuel pressure is proper and fix the airflow model - ive never used the lt1 fuel pump on a lnf/ldk before so im not sure it will work correctly given im sure the internal attributes are different to a point. Cyl 2 and 4 seem to be the problem childs and you've appeared to of swapped coils and plugs to no success and have good compression - what were your readings?. could possibly be an injector issue. is it a brand new engine or used - same same with the injectors? just a question because sticky valves are known to cause misfires along with shitty fuel - did you recently just fill up? but with your trims being as lean as there are and if everything checks out fine vac leak wise/fuel pressure then you need to work on getting the airflow model tuned better because then it could just be a lean misfire but hopefully it doesn't have anything to do with the fuel pump. add current misfires to you pids and desired fuel pressure
also what plugs are you running and at what gap?stock coils? tune file would also help
Last edited by TCSS07; 02-25-2019 at 05:04 PM.
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Potential Tuner
brand new LDK block straight out of the machine shop, brand new opels aswell. stock plugs and coils. getting new plugs tomorrow and changing maf out with my old good one. compression is at 150psi in every cyclinder.
Jordan257-E47-01.hpt
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Potential Tuner
turned out it was a mixture of zzp rewire kit/coil pack/bad gas
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Advanced Tuner
good, glad thats handled but if that doesn't fix your trim issue you need to work on tuning the airflow model
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Potential Tuner
Yeah I'm getting tuned by Kevin he just sent me a base map then this happened lol