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Repair Topics / Throttle
Body Injection
Car and Truck Engine T.B.I. (throttle body
injection) Fuel Injection Questions This
category contains featured questions as
examples. They relate to most vehicles.
Question:
1989
Chevrolet Camaro, mileage: 187,000. I
have backfiring thru the TBI unit problem.
I have changed the EMC, TBI unit, map
sensor, dist module, set the timing, and
scanned the computer with my Snap-On
scanner, all to no avail. There are no
codes in diagnostic or driving mode.
Any help would be appreciated. Thank
you.
Answer:
Check for internal engine problems such as a blown head
gasket, broken valve spring or rocker arm, flat cam etc.
Question: 1992 Buick Skylark
2.5, mileage 103,000. No gas out of T.B.I. unit. I
replaced whole unit and no change. Good gas pressure to
it. Pour gas in manually and it will fire. I wiggled
wires, rapped on computer, etc. I have electricity to
T.B.I. with switch on, and a ground on the same wire
when switch off. Any help would be greatly appreciated.
Thanks again.
Answer: The T.B.I. unit is
controlled by a number of inputs to the PCM. If the PCM
sees no distributor reference, or oil pressure, it will
not send a pulse to the injector, or if there is no
power to PCM, no injector operation can occur.
Repair Topics / Throttle
Body Injection
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