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1992 buick century efi problem
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Guest
Anonymous Poster
Mar 17, 2008, 4:38 AM
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1992 buick century efi problem
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hellow, I have a 3.3L engine not getting fuel to the cylinders. i have 44psi at the fuel rail but car will not start. starting fluid in the air box and she runs. have replaced the crank sensor and the computer behind the glove box, no cam sensor. not sure what to do next. thanks for your time
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DanD
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/ Moderator
Mar 17, 2008, 10:01 AM
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Re: 1992 buick century efi problem
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A few basic things to check would be is there power to the pink wires of all injector connectors. If so is there injector pulse from the computer. Check this with the use of a noid light connected to the injector connector and then crank the engine; the light should blink.
Here’s a sample of what a noid light looks like, this is a kit with different connector types.
Next test the throttle position sensor (TPS) signal. If it has shorted to power and signal return is above 4 volts; that’ll put the computer in clear flood mode and shut the injectors off.
Let us know what you find
Dan.
Canadian "EH"
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Guest
Anonymous Poster
Mar 17, 2008, 11:08 AM
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Re: 1992 buick century efi problem
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no the light does not come on when plugged into the injector harness.
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Guest
Anonymous Poster
Mar 17, 2008, 1:29 PM
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Re: 1992 buick century efi problem
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dave not sure what this is show me the car has spark and fuel pressure, i think i need to find out what triggers the injectors to fire and where on the car it is located. thanks for your reply
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dave284
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Mar 17, 2008, 2:38 PM
Post #6 of 10
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Re: 1992 buick century efi problem
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It depends on which kind of firing system you got....DIS or HEI cause the DIS has a puter not the brain box one...which the injectors are intergrated in....the link I posted showed the circut diagram still depending on the system on the vehicle
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DanD
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Mar 17, 2008, 2:59 PM
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Re: 1992 buick century efi problem
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The electronic control module (ECM); (computer) “triggers” the injectors. In this application it bank fires the injectors; as in 1, 3 &5 are fired together and then 2, 4 & 6.
Is there system voltage on the pink injector wires with the ignition switch in the run position?
What is the signal return voltage of the TPS?
The signal return wire for the TPS is the dark blue wire; leave the harness connected to the sensor and back probe the connector. Attach positive voltmeter lead to back probe and the negative lead to any known good ground. You can use a paper clip or a safety pin as a back probe. Just slide the clip or whatever, up the back of the connector along the wire, until you think you’ve made contact with the terminal inside the connector.
Closed throttle voltage should be approximately .5 (½) of a volt; wide open throttle 4.5 volts; with the ignition switch in the run position.
Let us know what you find
Dan.
Canadian "EH"
(This post was edited by DanD on Mar 17, 2008, 3:01 PM)
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Anonymous Poster
May 5, 2008, 8:39 AM
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Re: 1992 buick century efi problem
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ok found original post. started form square one. have tested fuses and fuse box both are working properly.i do get the testlight to light up from the pink wire with key on and all connectors for injectors dissconnected from injectors, but i do not get it to blink when cranking engine. i did check tps while still connected to engine. .5 volts at closed throttle and 4.3 volts at wide open throttle. i apologize for earlier posts, just thought my replies would stay on the back pages and would get over looked. great day outside today. thanks for your time and knowledge
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Anonymous Poster
May 6, 2008, 6:19 AM
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Re: 1992 buick century efi problem
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i have been surfing the net for this problem and it seems to be some what common. funny thing is that not one forum on the subject (20 posts) has ever found or posted a solution!!!!!
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Guest
Anonymous Poster
May 29, 2008, 4:58 PM
Post #10 of 10
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Re: 1992 buick century efi problem
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dan thanks for your help with the first few steps of this repair. i made it to the finish line today and the car runs great. replaced all the injectors. but i now know that lots of other stuff is working properly.
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