whats wrong with my car?
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Member
Joined: Dec 2005
Posts: 102
Likes: 0
From: Waldorf,MD
Car: 87, 88 and 89 Iroc-Z
Engine: 305, and 350
Transmission: 700R, and T-5
Axle/Gears: 3:23 POSI
whats wrong with my car?
I just bought an 88 IROC-Z lo3 TBI T-5 and its really slow and the only idea i have is to ask and see what people say. My friend has an RS with the same specs and his rolls out. Mine is very slow and hesitant. Its bone stock. And im thinking the exhaust is cloged and is thier any tune-ups to TBI I can do? Im new to TBI so i need to just learn some new things i guess. Thanks Tim
Joined: Feb 2001
Posts: 13,756
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Welcome aboard Tim!
Chances are your car is just in a bad state of tune. I would look at a full tune up which should require the following.
New plugs (gapped to .035) (AC Delco preferred)
New plug wires
New cap
new rotor
new fuel filter
new air cleaner filter (might want to research open element)
check the base timing with the EST unplugged (set 0°, 2° or 4° advanced)
Replace the O2 sensor (stick with AC Delco)
Replace all fluids.
Check all of the vacuum lines that run out of the TBI unit. Make sure they are free of cracks and or damage. If damage is present replace them.
Your car might not need all of this but seeing how these cars are old and get neglected it is a good idea to replace them anyways. A little preventative maintenance can save you a lot of money in the future.
Take some time to read through the New to TBI sticky above as well. They will go into detail about parts selection..
Chances are your car is just in a bad state of tune. I would look at a full tune up which should require the following.
New plugs (gapped to .035) (AC Delco preferred)
New plug wires
New cap
new rotor
new fuel filter
new air cleaner filter (might want to research open element)
check the base timing with the EST unplugged (set 0°, 2° or 4° advanced)
Replace the O2 sensor (stick with AC Delco)
Replace all fluids.
Check all of the vacuum lines that run out of the TBI unit. Make sure they are free of cracks and or damage. If damage is present replace them.
Your car might not need all of this but seeing how these cars are old and get neglected it is a good idea to replace them anyways. A little preventative maintenance can save you a lot of money in the future.
Take some time to read through the New to TBI sticky above as well. They will go into detail about parts selection..
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