GM tech or guru please help
#1
GM tech or guru please help
2010 silverado 6.2 flexfuel 15k mi.
negative fuel trims off the charts,hard starting cold,just put gauge on it,at idle 45 LBS fuel pressure,turn engine off pressure creeps to 58lbs in 4min.
fuel filter and regulator all part of fuel pump assembly?
local dealer can be wierd about mods.considering pulling headers.This issue is with modified tune and stock tune
Any ideas or next test?
negative fuel trims off the charts,hard starting cold,just put gauge on it,at idle 45 LBS fuel pressure,turn engine off pressure creeps to 58lbs in 4min.
fuel filter and regulator all part of fuel pump assembly?
local dealer can be wierd about mods.considering pulling headers.This issue is with modified tune and stock tune
Any ideas or next test?
#4
Idle log,i have a driving log,tons of KR at cruise or light load.I tried to post it but to big,it see's -30 LTFT at times
it took no time to get headers off,cast iron goes back on AM before race starts ,fuel pressure gauge dropped to 35lbs after resting approx 5hrs.
next dealer ship is an hour away.that wierdness of the FP raising after engine shut off makes me think could it be filter plugged?
Im open to ideas,out of 12 new gm trucks since 1989 Ive had great luck and not had an issue this soon,sorta tempted to order FP just do it,Ive got little faith in dealer unless I personally know a tech
it took no time to get headers off,cast iron goes back on AM before race starts ,fuel pressure gauge dropped to 35lbs after resting approx 5hrs.
next dealer ship is an hour away.that wierdness of the FP raising after engine shut off makes me think could it be filter plugged?
Im open to ideas,out of 12 new gm trucks since 1989 Ive had great luck and not had an issue this soon,sorta tempted to order FP just do it,Ive got little faith in dealer unless I personally know a tech
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#8
Mod with training wheels
iTrader: (16)
Is that all the mods it has is long tubes? Sounds like it just needs some traditional fueling changes... Reset your LTFTs to see if it starts any easier.
Fuel pressures are normal. These trucks have an FPCM instead of FPR. Fuel pressures are controlled in the tune under 'desired pressure' in the fuel settings. You can change them if you like...mine runs 58psi all the time.
Fuel pressures are normal. These trucks have an FPCM instead of FPR. Fuel pressures are controlled in the tune under 'desired pressure' in the fuel settings. You can change them if you like...mine runs 58psi all the time.
#9
FP readings today are with stock tune,45lbs at idle is normal?,hey anyone want to see driving log just PM me your email,happy to send it.(up to) 14* KR at lt throttle cruise slight tip in. could really shitty gas be doing this? Im not hearing any detination