wierd bank 1 ltft
#1
wierd bank 1 ltft
i have been trouble shooting a problem with my ltft for about a month. i am getting a +8 to +15 in b1 while bank 2 hangs out around +1- -5. the wierd part is this only happens from 65-70mph at 1800-2000 rpm in od with the tc locked. if i drop her into third while maintaining this speed it goes away and trims drop to +-2.
heres what i have done so far with no joy
cold air intake checked
new w/b o2 sensor
reprogrammed w/b
new percys manifold gakets(deadsoft aluminum)
swapped o2s (problem stayed in bank 1)
swapped plug wires
checked plugs and gaps
fixed ground on the back of the block(the one on top of block next to cam sensor)
seafoam
swapped injectors
checked pushrods
rechecked the torque on the header bolts(again)
got any suggestions besides a 500 shot of juice to blow this fugger up?
heres what i have done so far with no joy
cold air intake checked
new w/b o2 sensor
reprogrammed w/b
new percys manifold gakets(deadsoft aluminum)
swapped o2s (problem stayed in bank 1)
swapped plug wires
checked plugs and gaps
fixed ground on the back of the block(the one on top of block next to cam sensor)
seafoam
swapped injectors
checked pushrods
rechecked the torque on the header bolts(again)
got any suggestions besides a 500 shot of juice to blow this fugger up?
Last edited by mcfarlnd; 08-13-2008 at 11:10 PM.
#4
the only place it could leak is at the gasket at the head (replaced) and the o2 sensor. (ive checked a million times and even sealed it in for extra insurance) both are good. the headers i have place the bank 1 sensor in the #1 primary and bank 2 in the #8 primary before the collector.
Last edited by mcfarlnd; 08-11-2008 at 08:18 AM.
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#8
TECH Senior Member
iTrader: (7)
Possibly a single injector dumping more fuel? Doesn't make sense at a certain spot in rpm range and tcc condition.
My second guess would be heat. NB o2's read different at different temps. Possibly at that rpm range that o2 is getting cold, low exhaust flow, compared to the other. Wrap that collector maybe.
It is not unusual to see one bank vs other with different fuel trims. Don't know if that much.
My second guess would be heat. NB o2's read different at different temps. Possibly at that rpm range that o2 is getting cold, low exhaust flow, compared to the other. Wrap that collector maybe.
It is not unusual to see one bank vs other with different fuel trims. Don't know if that much.
#10
Resident Retard
iTrader: (31)
After making a histogram that has LTFT Bank1 and LTFT Bank2 seperated, it looks like you might have a vacuum leak on one side... Notice the difference between the sides... Leaky intake perhaps or a leak around the injectors.... I would log the trims at idle and spray the crap out of it with some carb cleaner and see if the trims change..... Looking at the histogram the problem is across the board, not just at a certain MPH...
VE Bank1 LTFT
VE Bank2 LTFT
MAF Bank1 LTFT
MAF Bank2 LTFT
VE Bank1 LTFT
VE Bank2 LTFT
MAF Bank1 LTFT
MAF Bank2 LTFT
Last edited by BlackGMC; 08-11-2008 at 11:53 AM.