Question about 1991 Isuzu Rodeo

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3.1 L TBI it got one injector totally open I check signal whit a litle bulb is always on

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  • testarrosa12 Jun 27, 2009

    yes, I, don`t have this problem any more. One new wire to ECU D14 terminal to one injector in TBI it was the solution. Thanks.



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Power will be on one wire the engine ECU supplys earth when needed to other wire use noide light or diode test light between both wires and crank or start vehicle to see if it flashes. it should flash

Posted on Jun 25, 2009


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My 1995 Chevy s10 3.5 tbi won't spray fuel to the tbi, won't start and I redone all the ground wires but it still isn't grounded wats my problem

I can find no s10 with 3.5L engine? If you swapped engines, I'm afraid I can't help you?
I can talk to you about the basics. The fuel injector voltage circuit usually goes hot with the key on. The computer grounds the fuel injector ground circuit. engine cranking, if computer doesn't see rpm signal or there is a problem with security system, where applicable, the computer won't ground the fuel injector.

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What generates fuel injection pulse on a 1994 geo metro base model? I have replaced alternator, TBI injector, and ECU. Checked relays, fuel pump and filter. Feed and return line are clear. On startup I get...

The PCM (ECU does that) its part of what is called EFI, electronic fuel injection, it's a computer, that gets inputs, and uses those inputs to injector perfectly at ALL times.
what engine? 3cy. or 4? is it TBI injected or MPI injected
1 injector or 4? we need to know that first.
does it run on test fuel for 3 seconds.
when was last time it run perfect, last week last year. what?
first off stop guessing, you can go broke that way.
want to diagnosis it? the steps are easy. if fuel is good..
  1. fuses good.?
  2. CEL lamp glow keyon, if not ECU is bad. or bulb , it must glow.
  3. compression over 150PSI on all cyl. (w.o.t = wide open throttle)
  4. do a 60k, mile tune up yet, filters, spark,. and cam timing belt.?
  5. if not, why wait?
  6. 6: is spark good tall cylinders not just 1? is the timing way off if yes, the cam belt did slip, do not fiddle tiiming, fix the belt. first.
  7. ok it now magically runs on test fuel for 3 seconds and sounds great. so we do fueling last.
  8. fuel pressure tests are next. takes $20 gauge got one?
  9. ill stop here, as fueling tests are long play.l..... ask. if you can get to step 9,

I think all 94 metors are TBI engines, one injector
up to 1997 inclusive.
then the 1998 offered 4cyl, MPI injected engine.

have you learned how to use flash codes (DTC) yet?
insert jumper , key on, see CEL lamp glow and flash 12s'
the crank for 5seconds, see if the flashes go to 41 or 42?
bingo if yes.
the TBI allows the mech to watch injection, at the TB.
with top hose off. you can watch it inject as person 2 cranks.
does it?
the ECU brain cuts fuel at the first sign of:
  1. lost spark (to stop fires)
  2. lost Cmp sensor, same .
  3. TPS ground wire busted and ecu things foot is W.O.T (super secret unflood mode) (or TPS cracked in half inside)
or total loss of fuel pressure.

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Gmc 350 tbi drown itself

Sounds like one of the injectors has failed, or has dirt in it.
There is a small magnet in each injector that opens it - there is a spring to keep it closed.
Can you see one of the injectors leaking when you turn the engine off ?

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1989 K1500 was running fine and just quit. Not getting gas but I can hear the fuel pump start when I turn the key on. took fuel line off of TBI and seem to have plenty of gas flow but nothing comes out of...

you need to have the fuel pressure checked with a gage and volume as if its not at the spec the injectors won`t open to spray enough fuel.also you should check the injectors for proper voltages and ground as if these are not within specs then the injectors won`t work either

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My 1998 Chevy Blazer crank excessively when I try to start it. It always starts, and runs good when I get it started, but I would really like a smooth start. I have recently changed the fuel filter, spark...

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I have an 1988 chev 350 5.7 liter , my injectors will not work, there is fuel getting to the tbi, but somthing is telling them not to open, it was running bad now no fuel, i unpluged the map sensor. and...

you should have over 9psi while cranking with injectors working to start. if there is not enough presure it will not start. The computer tells the injectors to open, it actually controls the ground side of the injectors with power side always hot. the computer NEEDs the map sensor or it will not start, it needs crank and cam location sensors from the distributor, the TPS, etc. Plug all sensors in, check fuel presure, clear codes and start over, checking codes to determine what isn't working.

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1991 GMC Sierra loses fuel pressure after it reaches the TBI

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injectors probably gettin fuel just not opening,check your injector a&b fuse and/or your crank fuse in the fuse box,the computer requires a signal from the distributor while engine is crankin to open the injectors.your problem might be the pickup coil inside the distributor

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