Well, if my translation of your language is correct, then it *seems*
to be *fine*.
You say: "seems to start and run" which makes no sense, either it
starts and runs, or it doesn't start and run. It cannot 'seem' to
start and run.
Seems to start and runs translates into we threw the 89 TBI on the 95
and it started up . ran rough and then we changed the MAF sensor?
ran much better, but still missing some. got dark and we quit.
truck was NOT driven. the other TBI bolted right on, all the
mechanical fittings were the same. The colors of the wires on the
TBI solenoids was different. the 95 had an engine fire on the TBI,
so it was crisp. We butt spliced the solenoid wires from the 89 on to
what was left of the 95's harness. Hooked light colors to light,
and dark to dark. The wire colors were NOT the same. I don't know if
these have a polarity issue of not. Thats why i am asking questions.
Truck seems to been running well enough that the other issues could
be simple plugs/wires and such. But it concerned me when the wires
from the solenoids were not the same colors. I know swapping 4l60
trannies from that ears can be a treat because they changed little
things in them over the years that can cause issues. I just did
not know if they changed the TBI units somehow.
By TBI unit I assume you really mean "throttle body" (the TB in TBI) and by
"solenoid" I assume you mean fuel injectors (which are high speed solenoid
I don't think it had a MAF as IIRC all TBI systems were speed-density based
using a MAP sensor.
TBI unit or TBI system refers to the whole shebang AKA everything from the
in tank fuel pump to the the ECM to the sensors and throttle body itself.
Yes they changed the Throttle boddies some between those years. BUT the
changes are not something to worry about. The wire colors are not a real
problem either. The injectors are nothing more than a simple solenoid
valve. No polarity issues as long as they are not shorted out.
You likely changed the MAP sensor as none of the TBI systems GM had uses
Misses on an engine that had a fire are probably related to wiring
faults or vacuum lines that are leaking. Could even be intake gaskets if
it got hot enough.
Thanks for the reply. the engine idles good now. seems to rev at stop
we took it for a drive today and it is chugging under load like its
fuel starved. Will see if we can find a pressure gauge and see what
the Fuel pressure is. Should be 10/15 PSI?
we took the MAP sensor off the 89 and put it on the 95. the 95's looked
like it got hot.
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