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91 chevy 1500 p u the tbi is not spraying fuel out the 2 injectors spray starting fluid in the throttle body and it will start

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You need to check the fuel pump pressure and make sure the fuel filter is not plugged. The fuel pump is in the fuel tank as you probably know so you can put a pressure gage at the fuel filter when you remove the line or at the pressure side of the TBI connection.

Posted on May 05, 2015

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Check all engine grounds as the ECU relies on the control unit to find a ground and pulse the injectors. Also check the crankshaft sensor to make sure its pulsing when rotated. It should produce a 5 volt reference as it moves. Also check that you have fuel pressure as the pump also relies on a good ground to power up. Everything is controlled from the ECU.

Posted on Jun 23, 2014

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jagjeffery
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SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

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1 Answer

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I would want to know if it is ignition or fuel for sure. There are a few things you can try to narrow down the possible cause.
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Will it start on starting fluid sprayed into the throttle body ?
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I do not get a start up pluse on 91 Camaro RS 305


I assume you are not getting fuel spray from the injectors ?
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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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You first need to check the fuel pressure, an easy way to access this is to buy a can of spray starting fluid, spray it into the TBI throttle valve and if the truck starts and dies you have no fuel pressure. Replace the fuel; pump, and make sure you get the right pump, it is a low pressure system.

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1 Answer

1991 Geo Tracker only starts with starting fluid.


91 is 8valve TBI injection.
it is flooding.
the starting fluid is more combustible and starts a flooded motor.
kinda like adding dynamite to bbq lighter fluid.
hahah
ok,
try a tune up.
then try holding gas pedal to floor, this is super secret unflood mode and cuts fuel injection.

the issues why its flooding, not starting is normal for that condition.
so its:
1: bad need of tune up
and or
2: leaking injector.

the former you can figure out.
cap/wires/plugs /rotor, filters, there i said it.

or
this car has a viewable fuel injector
one an do 2 things with it.
key on five times , or 5 seconds on, not cranking
and other person looks down throttle body neck
yes, off comes the tube on top.
and makes sure the injectors dont dribble full time, key on.

or
the ECT is bad.

or dash pot is not opening at key on crank.

or
cold start, IAC is clogged.

complex it is,
it will take hard work to check everything.

http://carfix.stufftoread.com/
see flooding here.


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1 Answer

I have a 98 chevy 2500 that wont start but cranks over


You will need to get up there Right above the Throttle Body and hold a Good Maglight or LED Flashlight above the TBI and have Someone Crank it Over. You will see the Spray inside the Bowls if it is Getting to the TBI.

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