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1991 chevy s10 4.3 no pulse light
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young_hunter16
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Dec 9, 2010, 8:43 AM
Post #1 of 9
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1991 chevy s10 4.3 no pulse light
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howdy fellas i have a 1991 chevy s10 with the 4.3 v6 4x4 and its not starting its not getting fuel i have replaced the fuel pump,the fuel pump relay thinking it was that,then i talked to a mechanic that does work at my shop and he said if my injectors werent getting power or flashing when i put a noid light on it then my computer is bad so i had replaced my computer, then found out i was getting fuel to the throttler body but it wasnt going any frther it was returning to the tank dows any one have any ideas on how to solve this.
(This post was edited by young_hunter16 on Dec 9, 2010, 10:42 AM)
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young_hunter16
Novice
Dec 9, 2010, 9:04 AM
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Re: 1991 chevy s10 4.3
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also the night before it was running fine no problems at all drove it home from work ran fine, drove it to the store and home, parked it,went out the next morning to go to work it wouldnt start thats when i thought it was the fuel pump truck has 226,000 miles on it im not getting a pulse light either ive got power to both sides, could it be the regulator
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Sidom
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/ Moderator
Dec 9, 2010, 9:16 PM
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Re: 1991 chevy s10 4.3 no pulse light
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Ok, you've check both injectors & have no pulse. Have you check for spark? I know these are bit tough to check but try to make sure you are getting some kind of pressure.
If you have spark, spray some carb clean down the throttle body to see if it will start. If it does, take the cap off and check out the dist, ohm the pick up coil, I believe the spec are 1000 to 1500 ohms. Check all the wires in there to make sure there are no breaks, if you can get a "tester" control module try that but I would go out & buy one site unseen.....
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 10, 2010, 3:50 AM
Post #4 of 9
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Re: 1991 chevy s10 4.3
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Just to add to Sidom's instructions....... before you get too deep into it, make sure you have power at the injectors with the key on. If not,, check all your fuses first.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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young_hunter16
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Dec 10, 2010, 6:06 AM
Post #5 of 9
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Re: 1991 chevy s10 4.3 no pulse light
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ok its got spark itll start but whats the pick up coil wheres it at and what do i test imnot that car smart yet im only 18
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young_hunter16
Novice
Dec 10, 2010, 6:18 AM
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Re: 1991 chevy s10 4.3
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ht both sides of the ijectors have power with the key on the power wires do should the ground also light up if using a light tester and all fuses are good
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Sidom
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Dec 10, 2010, 9:15 PM
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Re: 1991 chevy s10 4.3
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Yes with KOEO there should be power on both sides of the injector. The PCM momentarily grounds the injector to fire it so when it's ungrounded (off) it's an open circuit and you are just seeing open circuit voltage on the ground side.
The pickup coil is inside the dist but if it will run on starting fluid, more than likely its good but it wouldn't hurt to ohm it anyway. It's a 2 wire connector going to the module, I believe the wires are green & white.
You mentioned a shop & a tech. Did you ask him if he has a tester module? At this point I would want to try a known good one to save some time plus you probably don't have the right equipment to check it properly.
I didn't see where you have checked all your fuses like HT suggested.....That should be done 1st.....
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young_hunter16
Novice
Dec 12, 2010, 5:34 PM
Post #8 of 9
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Re: 1991 chevy s10 4.3
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i got it i started checking the wiring and behind the motor i found two broke wire running to the ecu one had corroded apart and the other had burnt apart its now fixed and running in tie for the snow thanks guys for all your help
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Sidom
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Dec 12, 2010, 6:29 PM
Post #9 of 9
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Re: 1991 chevy s10 4.3
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Good job on tracking the problem down...
Thx 4 taking the time to let us know what you found out..
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