1990 Chevy Lumina need help motor will not start

Tiny
JASON1982
  • MEMBER
  • 1990 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
I have drained the fuel tank and gas lines and put new fuel filter on it. It is getting gas to the fuel rail. The motor turns over and sounds good, and it will fire with starting fluid I have checked all the fuses I don't new what to do now pls help thanks
Thursday, March 20th, 2008 AT 1:46 PM

13 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Throw a noid light on each injector wire harness and crank it it shoudl flash.

Let me know what you find.
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Thursday, March 20th, 2008 AT 7:56 PM
Tiny
JASON1982
  • MEMBER
  • 8 POSTS
I done the noid light test on it sorry it toke so long to get back to u but they had to order the lights so
anyways I did the test it didn't light up at all so I toke a test light and grounded it to motor mount and checked the injector plugs and its showing its hot coming out of both wires in the plug. For some reason.
None of the injectors are r sparing any gas

i don't know what is goning on with it its about to drive me nuts lol
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Monday, March 24th, 2008 AT 9:05 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Since it didnt light up that narrows it down a bit.

Check for voltage at each connectors with the key on, is there any?

Post back what you find.
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Tuesday, March 25th, 2008 AT 8:12 AM
Tiny
JASON1982
  • MEMBER
  • 8 POSTS
The test is showing that all the wires going to each injectors are showing hot both wires in the plugs thanks alot for the help so far
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Tuesday, March 25th, 2008 AT 4:59 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
One wire is should be hot when the ignition switch is on, and the other should have no voltage, the ecm controls the ground from information from the Crank and Cam shaft position sensors, MAF sensor and O2 sensors.

Have the ECM tested.
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Tuesday, March 25th, 2008 AT 6:55 PM
Tiny
JASON1982
  • MEMBER
  • 8 POSTS
I put a a new ecm on it last nite is the same thing is still goning on injextors not sparying and both wires r showing hot to the injector plug

thay wanted as much to test the ecm as thay wanted for a new one
lol I am about ready to take it to the juck yard lol

dose it have a camshaft senore on it?
Thanks alot
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Thursday, March 27th, 2008 AT 8:56 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Hook up a test light into the connector with the injectors all unplugged, and turn the key on does the light illuminate?
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Saturday, March 29th, 2008 AT 8:06 AM
Tiny
JASON1982
  • MEMBER
  • 8 POSTS
I done what u told to do and come up with this, with all the wire unplugged one wire is showing hot in all the plugs. If u plug one back in they all show 2 hots thanks a lot
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Sunday, March 30th, 2008 AT 8:06 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Are you saying only one of the wires shows hot in both plugs untill you plug it in, then they all show hot?

Leave the one that shows hot in both unplugged and keep the rest in, does it start?
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Monday, March 31st, 2008 AT 7:16 AM
Tiny
JASON1982
  • MEMBER
  • 8 POSTS
U have 6 plugs for the injectors with them all un pulgged one wire is showing hot if u plug one of the plugs back in it show s the hots in at 6 plugs thanks
so far
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Monday, March 31st, 2008 AT 5:05 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
With them all unplugged, thers only one injector wire that is hot? Is that the first injector wire or is it in the middle somewhere?

Is it showing hot on that plug on both of the terminals? How are you testing them with a test light? You hooking one end into one of the terminals and hooking the other into the other end of the terminals? If it doesnt light on the "hot plug" then both sides isnt hot and your testing them wrong individually.
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Monday, March 31st, 2008 AT 7:13 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnect the wiring harness at the ECM and Injectors now do a continuity test between the 2 the only way to have power at both wires is -its shorted together-one injector with shorted wire will bring down the rest-
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Monday, March 31st, 2008 AT 7:56 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Below is your circuitry

The light blue wire is the ground circuit that the computer uses to drive it off and on the black and pink is the hot circuit to the injector should have this power when key at on


https://www.2carpros.com/forum/automotive_pictures/12900_injectors_wiring_1.jpg

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Monday, March 31st, 2008 AT 8:19 PM

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