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1990 Pontiac Sunbird

Tiny
WACOLLINS
  • MEMBER
  • 1990 PONTIAC SUNBIRD
Engine Mechanical problem
1990 Pontiac Sunbird 4 cyl Front Wheel Drive Automatic

full not pulsating, dumping full constantly flooding intake
Friday, October 8th, 2010 AT 2:36 PM

9 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Possibilities, something wrong with injector/s-- something wrong with injector ground circuit-- something wrong with pcm. Any applicable mil codes?
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Friday, October 8th, 2010 AT 2:49 PM
Tiny
WACOLLINS
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Idid have someone look at it and they tested the inlector. They said something about the ground wasnt pulsating, or something to that effect.
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Friday, October 8th, 2010 AT 3:00 PM
Tiny
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Dont have codes
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Friday, October 8th, 2010 AT 3:01 PM
Tiny
JDL
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If there is no injector ground, engine cranking, and the vehicle is still flooding, must be something wrong with injector or possibly regulator leaking. What is the fuel pressure, use a gage. Some of the national brand autostores used to loan out a fuel pressure gage, if you don't have one.

As far as trouble codes, you should be able to check mil codes yourself, if you haven't already? The codes may not help anything? there is an aldl under driver side dash. You turn the key to on, just till the dash lites come on, no further, use a jumper wire between the A & B terminals at the connector. The mil on the dash starts flashing, you count the flashes to get the codes.


https://www.2carpros.com/forum/automotive_pictures/170934_sunbird_aldl_1.jpg

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Friday, October 8th, 2010 AT 3:37 PM
Tiny
WACOLLINS
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I jumpered the a&b terminals. It blinked once small pause then blinked twice. Then repeats.

And no itwant crank. It turns over and over. It hits like it wants to crank every now and then.

Just for a little back ground. I put a head gasket on it last week it had been setting for a couple yrs. It crank right up ran good. The next day it would stall when I put it in gear. Had to reave it up then put it in gear. Then it started jumping like crazy when I would slow down to take a turn. Then just cut off while driving havent been able to crank it sence.
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Saturday, October 9th, 2010 AT 1:52 AM
Tiny
JDL
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The code 12 means diagnostic mode. Did you visually check for spark at the plugs, engine cranking? If your TBI, single injector, you should be able to see if injector is leaking or spraying continously?
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Saturday, October 9th, 2010 AT 9:49 AM
Tiny
WACOLLINS
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Pleanty of fire through plugs. The injector is pulsing fuel when trying to crank, but fuel isnt a fine mist looks like a lot of fuel. Could the injector be releasing to much gas? And if so would that prevent it from cranking all together?
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Saturday, October 9th, 2010 AT 2:48 PM
Tiny
JDL
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Use a gage and check fuel pressure. If you haven't already?
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Saturday, October 9th, 2010 AT 3:15 PM
Tiny
WUTSUPY
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OHHHH I got this one, happened to me, the gasket thats on the injector is cracked and insted of spraying in the injector the gas goes around the injector and shoots down the tbi
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Monday, November 15th, 2010 AT 5:13 PM

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