irritating TBI mis-fire
08-10-2009, 09:10 PM
#1
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Car: 1993 Caprice Classic "Woodie"
Engine: 350 TBI W/EBL Flash
Transmission: 4L60 S10 converter
Axle/Gears: 8.5, Torsen T2, 3.73s
irritating TBI mis-fire
'93 L05
I have fought this for too long I may breakdown and take it to a professional.......
The car has been running like butt for too long, now it failed emmisions (too rich).
The mis-fire is thru the rpm range but real bad just off idle.
I have replaced....
O2 sensor twice (including a heated one from TBI chips)
coolant sensor
map sensor
Iat sensor
IAC
coil
new distributor (and module)
rebuilt the throttle body/regulator (and swapped in a spare set of injectors)
cap/rotor/plugs/wires
replaced fuel filter
None of these made it run better or worse........
I seafoamed it
I haven't found any vacuum leaks
did compression check, 2 thru 8 at 210, #1 at 190. Not great but that doesn't seem like enough to make it run this bad.
Checked fuel pressure... 9psi at idle
tested the EGR by applying vacuum, stalled the motor, probably OK?
I'm stumped.......................................
I have fought this for too long I may breakdown and take it to a professional.......
The car has been running like butt for too long, now it failed emmisions (too rich).
The mis-fire is thru the rpm range but real bad just off idle.
I have replaced....
O2 sensor twice (including a heated one from TBI chips)
coolant sensor
map sensor
Iat sensor
IAC
coil
new distributor (and module)
rebuilt the throttle body/regulator (and swapped in a spare set of injectors)
cap/rotor/plugs/wires
replaced fuel filter
None of these made it run better or worse........
I seafoamed it
I haven't found any vacuum leaks
did compression check, 2 thru 8 at 210, #1 at 190. Not great but that doesn't seem like enough to make it run this bad.
Checked fuel pressure... 9psi at idle
tested the EGR by applying vacuum, stalled the motor, probably OK?
I'm stumped.......................................
Last edited by WagonmasterRuss; 01-21-2010 at 08:13 AM.
08-12-2009, 01:46 PM
#2
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Car: 1993 Caprice Classic "Woodie"
Engine: 350 TBI W/EBL Flash
Transmission: 4L60 S10 converter
Axle/Gears: 8.5, Torsen T2, 3.73s
Re: irritating TBI mis-fire
O.K...................
08-13-2009, 01:04 AM
#3
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Car: SOLD IT. Mopar guy only now.
Engine: gone
Transmission: gone
Axle/Gears: gone
Re: irritating TBI mis-fire
no vacuum leaks? you spray carb cleaner around the intake ports and see if the rpm goes up or around the throttle body gasket. compression seems to be good so you'd assume the valves are okay. egr might be okay but is the egr solenoid activating it. the timing is right?
08-14-2009, 02:33 PM
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Car: 1988 Pontiac Firebird
Engine: 5.0 TBI
Transmission: W/C T5
Axle/Gears: 3.08 Posi
Re: irritating TBI mis-fire
Your fule pressure sounds low. Your pump is most likely the problem.
02-02-2010, 09:18 AM
#7
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Car: 1993 Caprice Classic "Woodie"
Engine: 350 TBI W/EBL Flash
Transmission: 4L60 S10 converter
Axle/Gears: 8.5, Torsen T2, 3.73s
Re: irritating TBI mis-fire
Correct!
see my other post.
Thanks!
see my other post.
Thanks!
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