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1991 Saturn SC1 wont start

Tiny
QKASS96SATTY
  • MEMBER
  • 1991 SATURN SC1
Engine Mechanical problem
1991 Saturn SC1 4 cyl Front Wheel Drive Manual

i have recently just tried starting a rebuilt motor got it runing let it warm up drove it for 4 to 5 min turned it off to go back over everything and tried to start it again and all it would do is crank ive ran several test and found that I have no injector pulse ive went over every ground to the motor fuse block engine computer and all were good ive even replact the crank position sensor. Any idea what might b wrong
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Monday, August 2nd, 2010 AT 7:20 PM

18 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
First of all thank you so much for your donation. First thing I need to know is that you have a twin cam engine with four fuel injectors?Also that it's a 1991 saturn. Let me know and we will go from there.
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Monday, August 2nd, 2010 AT 8:04 PM
Tiny
QKASS96SATTY
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It is a dohc 5sp with 4 injectors and yes its a 91 but the engine came out of a 98 but it had no trouble starting b4 I did the rebuild to it im at such a lose with this car right now
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Tuesday, August 3rd, 2010 AT 6:27 AM
Tiny
SATURNTECH9
  • MECHANIC
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Lets go with no injector pulse turn the key on to the run position now check the pink and black wire's they should have power going to them. Let me know what you find.
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Tuesday, August 3rd, 2010 AT 3:08 PM
Tiny
QKASS96SATTY
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Ok so I turned the key on and put one of my test leads on the black wire and one on the pink wire I have a light bulb in betwwen my leads if it lights up ive got power and ground to the injectors but u know this already well my light didnt turn on but with on of my leads in the power side of the injector and grounded to the battery it does turn on but with it in the ground side of the injector and on the power side of the battery it didnt. So this means I dont have a ground to my injectors right?
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Tuesday, August 3rd, 2010 AT 4:38 PM
Tiny
SATURNTECH9
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Check the number 4 big green 30 amp fuse and look for a injector mini fuse check that one also. Let me know what you find.
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Tuesday, August 3rd, 2010 AT 4:55 PM
Tiny
QKASS96SATTY
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  • 10 POSTS
Ok big green fuse is good and so is injector fuse
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Tuesday, August 3rd, 2010 AT 5:02 PM
Tiny
QKASS96SATTY
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  • 10 POSTS
Ok ive also got a clicking sound (like a relay clicking) under the center consoul that wont stop unless the battery is unhooked
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Tuesday, August 3rd, 2010 AT 5:08 PM
Tiny
SATURNTECH9
  • MECHANIC
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One side will be power all the time if you have power to the pink and black wire's that's good. The other wires which are ground won't be ground all the time or gas would flood your engine. Those wire's are pulsed ground from your pcm. Now with one wire of that bulb touched to power and the other wire going to the ground side of the injector crank the engine and see if the bulb flashes. Let me know what you find.
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Tuesday, August 3rd, 2010 AT 5:16 PM
Tiny
SATURNTECH9
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That's your seat belt relay they usually only do that when your battery is dead. So you will have to see if your battery is dead before you do that last test I gave you.
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Tuesday, August 3rd, 2010 AT 5:18 PM
Tiny
QKASS96SATTY
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  • 10 POSTS
Ok yea battery was dead I charged it up and redid the test and iv got ground to the injector
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Tuesday, August 3rd, 2010 AT 5:55 PM
Tiny
SATURNTECH9
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Does the ground pulse?It shouldn't stay on solid?If it pulses then why did you say you didn't have injector pulse?
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Tuesday, August 3rd, 2010 AT 6:01 PM
Tiny
QKASS96SATTY
  • MEMBER
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Ok now im confused sorry I just know I got a seriuose problem and its kill n me so ive got an actual test light and did ur test procedure again I hooked the gator clip of the test light to the negitave side of the battery and the other end of the test light to the power side of the injectors the light stay on solid on all the injectors but with the gator clip on the positive side of the battery and the other ens on the negative side of the injectors I got no light
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Tuesday, August 3rd, 2010 AT 6:18 PM
Tiny
QKASS96SATTY
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Ok so I did the test with bulb on power and other end on the gound side of the injector try n to get the light to pulse and it didnt
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Tuesday, August 3rd, 2010 AT 6:24 PM
Tiny
SATURNTECH9
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Now i'm confused lol so did you use your test light with the aligator clip on the positive side of the battery and probing the negative side of the injector harness. Then cranking the engine did the light flash?
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Tuesday, August 3rd, 2010 AT 6:29 PM
Tiny
QKASS96SATTY
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Thats what I did and no it didnt flash
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Tuesday, August 3rd, 2010 AT 6:32 PM
Tiny
SATURNTECH9
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The test light doesn't light at all?Also do you have spark?
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Tuesday, August 3rd, 2010 AT 6:50 PM
Tiny
QKASS96SATTY
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Nop no light at all and yes it has spark I was told to check the ohms on my injectors and they are go n from about 4 and they trinkle down to.01 I thought they were supposed to stay up around 4 ohms
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Tuesday, August 3rd, 2010 AT 6:53 PM
Tiny
SATURNTECH9
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/416332_1991_SC_injector_wiring_part2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_SC_crank_no_start_part1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_SC_crank_no_start_part2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_SC_crank_no_start_part3_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_SC_crank_no_start_part4_1.jpg


Follow the trouble i posted the pcm is on the driver side right as you enter the car under the dash can't miss it.
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Wednesday, August 4th, 2010 AT 12:50 PM

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