No spark? Ignition?

Tiny
CPATTON119
  • MEMBER
  • 1999 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 49,600 MILES
I have a 99 s10 2wd auto with a 4.3 its not getting spark I checked just about everything. I bought the truck from a guy and the wiring was in a box. We hooked everything up but get no spark. It turns over. I dont have a bcm its been deleted using transistors. I was wondering if not have the key with the chip in it would matter. The guy said he had it running but who knos. Any help would be great.
Saturday, May 22nd, 2010 AT 6:34 PM

42 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It sounds like the wiring can be the issue this guide can help confirm the problem so we can fix it.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please run down this guide and report back.
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Saturday, May 22nd, 2010 AT 6:40 PM
Tiny
ROBERT BROWN PHD
  • MEMBER
  • 5 POSTS
  • 1997 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 185,000 MILES
I had a small fire on my engine drivers side rear of the engine the fire was put out fast battery disconnected fast replace the wires it started up and drove maybe a half a block then died right now the dash and nothing works on the dash the fuel pump does not come on and there was no spark any ideas what went wrong
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You probably STILL have damaged wires either inside or in engine compartment. Check to see if any fuses blown under hood
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
ROBERT BROWN PHD
  • MEMBER
  • 5 POSTS
No fuse block under hood. Fusable links.
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
ROBERT BROWN PHD
  • MEMBER
  • 5 POSTS
No lights on dash come on either. Going to check ignition. Sensor in exhaust is not connected. It ran for maybe 3 minutes after we did the wires before it just shut off. No fuel no spark
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
ROBERT BROWN PHD
  • MEMBER
  • 5 POSTS
Not ignition. I will replace all fusable links next. Fuse for instruments keeps poping
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then check that wire or wires going to the gauges there will be one for each instrumentyou more than likely have wires melted together inside harness under conduit and tape. If you are lucky you didn't burn up the ecm or another module. See if you can scan for codes that may tell you what problem is if you can get a reading.
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
ROBERT BROWN PHD
  • MEMBER
  • 5 POSTS
Will do. Dealership mechanic told me as a rule a fire where wires melted to frame they total it. The fact it ran for 3-4 minutes really means nothing. So its back under it for me. Think I'll sell it for what I can get.
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Monday, July 13th, 2020 AT 1:11 PM (Merged)
Tiny
RUSTY RANDOLPH
  • MEMBER
  • 3 POSTS
  • 1998 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 114,000 MILES
One cylinder has no spark at all one has... Speratic spark, two are just fine. I've replaced all plugs & wires, both ignition coils and the control modul. The only other wires I see go to sensors how can I test which one is the bad one, or is there really another "brain" somewhere (every one tells me there is no other "brain")?
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome, which control module did you replace? Ignition control module? The two cylinders your having trouble with, both plug wires come off the same coil? With your system, one coil fires two plugs at the same time.
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
RUSTY RANDOLPH
  • MEMBER
  • 3 POSTS
Thank you for your quick responce. I replaced the controle module the two ignition coils plug(sit) on, is there anouther one? Where is it?
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The two plugs wires for the cylinders where you have problems, are they on the same coil? The computer controls one coil on the white wire. It controls the other coil on the orange wire. Can you check for trouble codes? Right now, I can't tell where your problem is located?
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
RUSTY RANDOLPH
  • MEMBER
  • 3 POSTS
One ignition coil was bad, before replacing with a new coil I switced to see if the other plugs would spark and they did, so instead of cylinders 2&4 not fireing now 1&3 so we replaced both ig coils & controle moduls but the problem still exists. How do I get the code number?
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
With obd11, you need at least an obd11 code reader. Your firing order is 1342, 1 & 4 on the same coil, 3 and 2 on the same coil. Something isn't right? If 1 and 3 are misfiring because of spark, they are on different coils. Maybe I misunderstood?
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
SUPERGUZ
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET S-10
96 S-10 Blazer 4.3 TBI just died on me thought it was the fuel pump replaced it still dead. I have no power going to the fuel pump, and there seems to be no spark. Replaced the ignition control module still nothing. And I cant seem to get a code it just says no link. I'm puzzed any idea's out there, battery seems week could it be a bad module even though its new. Relays seem to be working is there a fuse in the Vehicle Control Module or is it bad. Oh yea it has 96,000 on it
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lets get the fuel to reach the injectors. Below you will find the fuel pump relay. Get help by having someone to cycle the key to On a few times to listen whether the relay is clicking-is it?

Fuel pump relay location below at no.3 left top corner square box.


https://www.2carpros.com/forum/automotive_pictures/12900_fuel_pump_relay2_1.jpg

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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
SUPERGUZ
  • MEMBER
  • 2 POSTS
The relays are working still no juice to the pump and there is no fire at the plugs still baffled
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+2
Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
At fuel pump relay at dark green and white wire should have battery voltage coming from the computer-check this out.


https://www.2carpros.com/forum/automotive_pictures/12900_fuel_pump_relay_circuit_1.jpg

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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
TRIGGERDIOBLO
  • MEMBER
  • 3 POSTS
  • 1996 CHEVROLET S-10
Electrical problem
1996 Chevy S-10 6 cyl Four Wheel Drive Automatic

My S-10 Blazer will crank over but will not start. I have checked voltage to the coil and the distibuter. I put a new coil and ignition module in and still no change. The out put of the coil is 12 volts with the key on but when crancked it drops to 8 volts instead of pegging out the volt meter. I am stumped
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Monday, July 13th, 2020 AT 1:12 PM (Merged)
Tiny
TRIGGERDIOBLO
  • MEMBER
  • 3 POSTS
I got it, it was the crackshaft sensor. The new one must have been faulty.
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Monday, July 13th, 2020 AT 1:12 PM (Merged)

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