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1990 Pontiac Sunbird 2.0

Tiny
WUTSUPY
  • MEMBER
  • 1990 PONTIAC SUNBIRD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
I own a 1990 Pontiac Sunbird and 2 years ago the car stopped running, it first wouldnt start one day than the next it did than it completly died. I than left the car alone for 2 months. I checked the car over and realized the fuel pump was not on so I repaced the fuel pump than the relay than the oil pressure switch. When these did not work I took the car in to my school. This was a few months ago. Me and my friend than just decided to bring a hot wire to the pump. It now pumps fuel to the throttle body but now wont inject the gas in to the engine. So we tested for power and we got juice coming to the injector but it wouldnt inject so we cut the blue wire and grounded it to the frame. The car now injects gas but it floods it self out. I realy need help, winter is coming up and this is my old dependable car.
So I did a little looking and I realized the computer should turn on the pump and injector. So there is something that should tell the computer to sent a signal to the pump and injector, and thats the problem, SO WHAT CONTROLS THE SWITCH IN THE COMPUTER TO SEND A SIGnal TO THE PUMP AND INJECTOR?
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Monday, November 15th, 2010 AT 7:29 PM

22 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
You need to undo what you have done. Is this distributor ignition? If so, have helper crank it, while you visually check for spark at the plugs, anything? The computer has to see an rpm signal or no injector pulse. With distributor ignition, the signal comes from the pick-up coil to the ignition module, from the module to computer. Any applicable mil code? As far as fuel pressure, use a gage, If the oil pressure switch in the fuel pump circuit and the fuel pump relay get load voltage from the same source, you need to check fuse and fuseble link where applicable. Sorry about that, I tend to ramble, sometimes.
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Monday, November 15th, 2010 AT 7:50 PM
Tiny
WUTSUPY
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The car gets spark, I can shoot gas down the throttle body and the car pops off and runs, than dies, so it does get spark, should I check the plugs anyway? I can check but I belive it is getting spark.
I did not get any codes from the computer.
I used a gage and I get 43 psi for the fuel pressure.
I replaced the oil pressure switch long ago, and I have the engine diagram and I dont see any fuseble links and all fuses are good.
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Monday, November 15th, 2010 AT 8:48 PM
Tiny
WUTSUPY
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I was told to look at the crank shaft sensor, also, does that make sence to you, and the location is under a cover on the left size of the engine under a belt, does that make sence to you?
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Tuesday, November 16th, 2010 AT 5:04 PM
Tiny
VERN1939
  • MEMBER
  • 15 POSTS
WUTSUPV

where can I get an illustration of the motor 2.0 1991 pontiac so I can identify parts and locations. Well duh on me. Locallly none avaiable even from dealer (hostile ) and library only has basic chilton.

Ol time shade treee vern1939
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Saturday, November 20th, 2010 AT 5:44 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'd want to check for injector pulse. With crank signal, no spark. Sorry about the late reply, everything went to spam, don't know why?
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Monday, November 22nd, 2010 AT 9:42 PM
Tiny
WUTSUPY
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I checked for pulse, nothing I was told to look at the ignition module and I checked it with ohms and it tested the same as a new one, I went to a parts, took the new and compared it with the old
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Tuesday, November 23rd, 2010 AT 1:23 AM
Tiny
WUTSUPY
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  • 59 POSTS
Ok I was told to check the ignition module, how do I pull it out, and more importantly, how do I test it?.A few minutes latter, I just pulled it out, on the side with 3 prongs I get power to 2 of the 3 prongs, the one I dont get power to is labled B, is this my problem, and if itisnt I need to know how to test the module, with ohms? Or?
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Tuesday, November 23rd, 2010 AT 1:38 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I asked if you had distributor ignition? The info I looked at was for 2.0 1990 sunbird, non-turbo. If you have spark at the plugs and no injector pulse, I suspect the ignition module. On this vehicle with distributor ignition, there is no crank sensor.
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Tuesday, November 23rd, 2010 AT 3:37 AM
Tiny
JDL
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If somebody else is telling you all this, why aren't you talking to them?
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Tuesday, November 23rd, 2010 AT 3:39 AM
Tiny
VERN1939
  • MEMBER
  • 15 POSTS
Only watsup is talking to me and we dont seems to be getting anywhere.

I got new plugs, wires, good spark at plugs
rotor and cap ok
non turbo
just gallons of gas when I turn on key at tbi at injector.
Checked o rings, new ones.

Where is ignition module?
Checked coil
checked continuity of plugs, coil connector, all ok.

Only sensors I see are on exhaust (oxygen?) Under distributor (engine temp as coolant comes out when I checked it) sensor on
throttle(put in new one)

so appreciate you help. I have tried local "mechanics" and they dont have a clue.

Thanks Vern
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Tuesday, November 23rd, 2010 AT 12:32 PM
Tiny
JDL
  • MECHANIC
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Hi vern1939, I wasn't talking to you. It would be best to start your own individual post. Cuts down on the confusion. I'll try to find an illustration. When you talked to the dealer, did you ask to talk to the service department? I have found them to be helpful, if they are not too busy. There are always some exceptions. You can click on your log-in name to check for messages. Also, if that ground to your injector/s is constant, faulty ground or problem with computer. Check injectors. If something is causing the computer to go bad, you have to fix that first, or it may damage the new one. Do an ohms test on injectors.
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Tuesday, November 23rd, 2010 AT 1:52 PM
Tiny
WUTSUPY
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  • 59 POSTS
I always thought that a little info from everyone was more reliable than alot of info from one person or source. That being said I post on this than I ask at my local united auto, this being said both of my sources tell me to look at the ignition module, and now im going to pick one up tomaro. When I took the module off, I tested for power and I have 12 volts in the side with 3 prongs, 2 have power, the one labled B has none. I well update again when I put in the new sensor.
And sorry about the confusuion. And YES it does have distributer ignition.
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Tuesday, November 23rd, 2010 AT 5:01 PM
Tiny
WUTSUPY
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And also I did check it with a Noid light, I got nothing.
Thanks

And I miss posted before I ment module, not sensor
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Tuesday, November 23rd, 2010 AT 5:04 PM
Tiny
JDL
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Did you check for voltage at the injector, key on. Use a testlite and chassis ground on the voltage circuit. Did the noid lite come on?

I think your right to get all the info you can.
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Tuesday, November 23rd, 2010 AT 5:32 PM
Tiny
WUTSUPY
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Yes im getting 12V to the injector with the key on.
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Wednesday, November 24th, 2010 AT 5:37 PM
Tiny
JDL
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One possibility is the computer doesn't see an rpm signal. That comes from the ignition module. There could be something wrong with injector ground circuit?
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Wednesday, November 24th, 2010 AT 6:27 PM
Tiny
WUTSUPY
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Ok well ill pick up a ignition module from united tomorrow and ill install it monday.
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Thursday, November 25th, 2010 AT 5:00 PM
Tiny
WUTSUPY
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  • 59 POSTS
Ok I installed it, than used NOID light, it blinked (very very exciting) I hooked to injecter, it did not inject, and gets fuel and power and ground, so it seems I need an injector, im going to try and locate my old injector and try those. Any outher sugestions
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Monday, November 29th, 2010 AT 4:58 PM
Tiny
JDL
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When you replaced injector/s did you use new ones?
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Monday, November 29th, 2010 AT 5:24 PM
Tiny
WUTSUPY
  • MEMBER
  • 59 POSTS
Yes right from united auto, before we got the ground circuit to work we grounded that circuit so the injector would stay open, and while we did that we held the ground to metal and it sparked a bunch so im asuming we fried the injector while doing that so im going to find the injector that was originally on the car and try that
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Monday, November 29th, 2010 AT 7:16 PM

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