Insane! Hazard switch fueling problem lol
Thread Starter
Heel & Toe
Joined: Jan 2019
Posts: 16
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Insane! Hazard switch fueling problem lol
So car died in the middle of the street. Pulled over and started troubleshooting. Being a 18 year Navy electronics guy figured it would be easy. Had cleaned and oiled air filter a day ago. Figured MAF was dirty. Walked to store bought cleaner and nothing. Unplugged it and nothing. Car idled barely and would die. Finally if started running. Noticed blinker was stuck on. Tapped hazard switch and car died. So..... a bad hazard switch can cause a ground to MAF and make it idle rough and die. Fix is to pull fuses 15 and 8. No blinkers but car will run. ACDelco 10359036 $22 on Amazon.
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From: Cape Coral, Florida
James, I'm trying to figure out what you had. So you cleaned and oiled filter and then the car ran bad the next day ??...sometimes people over oil and cause the MAF issues. If the MAF sensor you think may be bad you can unplug it and start the car...it will now get it's "fueling strategy" from the MAP sensor and a few other things and will sputter initially but run OK. I don't know if that's what you did but the hazards and MAF are not tied in...the only thing is if a 5 volt ref. (there are a few) from another sensor such as the TPS,MAP, APP gets shorted it can drag down ALL 5 volt ref. voltages and the car will not start...I think this was only a coincidence you saw !!...."FLY NAVY" !!!
Last edited by C5 Diag; May 23, 2019 at 01:23 PM.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I agree 100% Neither of the two are at all related. Are you seeing any PCM related DTCs? Please read and post them.
C5 Diag. When I was still on the Navy, I was flying to another base on United Air for a conference. It was a one day trip and I flew in Uniform. I sat down next to an elderly lady and she asked. Are you in the Navy? I said: Yes I am. Then she said "You must know my Son."
Hmmmm,,, How many people are in the Navy??????????????????? LOL!
C5 Diag. When I was still on the Navy, I was flying to another base on United Air for a conference. It was a one day trip and I flew in Uniform. I sat down next to an elderly lady and she asked. Are you in the Navy? I said: Yes I am. Then she said "You must know my Son."
Hmmmm,,, How many people are in the Navy??????????????????? LOL!
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,498
Likes: 3,999
From: Cape Coral, Florida
I agree 100% Neither of the two are at all related. Are you seeing any PCM related DTCs? Please read and post them.
C5 Diag. When I was still on the Navy, I was flying to another base on United Air for a conference. It was a one day trip and I flew in Uniform. I sat down next to an elderly lady and she asked. Are you in the Navy? I said: Yes I am. Then she said "You must know my Son."
Hmmmm,,, How many people are in the Navy??????????????????? LOL!
C5 Diag. When I was still on the Navy, I was flying to another base on United Air for a conference. It was a one day trip and I flew in Uniform. I sat down next to an elderly lady and she asked. Are you in the Navy? I said: Yes I am. Then she said "You must know my Son."
Hmmmm,,, How many people are in the Navy??????????????????? LOL!
Thread Starter
Heel & Toe
Joined: Jan 2019
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I understand what you are saying. I am telling you, I pushed the hazards switch and it caused the car idle at 200rpm then die. I pulled fuses 15 and 8 and drove it 45 miles home without a problem. Trust me. That was after unplugging the MAF and trying to start it. That was after cleaning the MAF and it not working. It is the bad hazard switch grounding it self somehow. I can recreate it by putting fuses back in and take video. I troubleshoot weapon systems on warships. I see a lot of things that don't make sense. We call it PFM.
Thread Starter
Heel & Toe
Joined: Jan 2019
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Please believe me. The hazard switch grounded it self and caused my MAF to operate incorrectly. I will put my fuses in and show everyone. Ill post a video soon. When a voltage is grounded it can take voltages away from other equipment using that same voltage. Unplugging the MAF made no change. I saw the MAF all over the place on my tuner while plugged in and unplugged with my hazard fuses in.
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Thread Starter
Heel & Toe
Joined: Jan 2019
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Zero codes as stated. I could get car to run after pushing hazards a few times. Soon as I hit the hazards or turn signals again it would die. Unplugged the hazards fuses and fixed problem. New hazard switch will be here tomorrow. I troubleshot for an hour. MAF unplugged didnt make a difference. Somewhere the hazard switch is interfering with the voltage the computer gets. I will make a video to show the world.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The only way (at least that I can see) that the hazard switch would be able to effect the engine would be because theres a part of the circuit that gets power from the IGNITION SWITCH (hot in run and start). If the things that are powered dray more current than the dirty/defective ignition switch contacts can provide, YES, it would cause other critical engine sensors to start to fail.
Here's a schematic for you.
Look at what the "hot in run and start" (Fuse 15) supplied powers LIGHTING!. That would be enough to draw that current/voltage to cause an issue:
If it were ME, I would replace or service the ignition switch!!
Here's a schematic for you.
Look at what the "hot in run and start" (Fuse 15) supplied powers LIGHTING!. That would be enough to draw that current/voltage to cause an issue:
If it were ME, I would replace or service the ignition switch!!
Thread Starter
Heel & Toe
Joined: Jan 2019
Posts: 16
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So if that is what is wrong why can i drive my car with the fuse 8 and 15 pulled? Bottom right shows the grounds are shared. One ground in a power distribution system will take voltage away from all circuits.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
James,, Just try it with fuse 8 and fuse 15 pulled separate. Anytime they are ON, they draw more current from the ignition switch circuit. Sounds like your switch is compromised and cant take much of a load before it cant supply enough voltage in critical circuits.
That's my best guess,
Bill
Last edited by Bill Curlee; May 25, 2019 at 12:06 PM.
Thread Starter
Heel & Toe
Joined: Jan 2019
Posts: 16
Likes: 0
The only way (at least that I can see) that the hazard switch would be able to effect the engine would be because theres a part of the circuit that gets power from the IGNITION SWITCH (hot in run and start). If the things that are powered dray more current than the dirty/defective ignition switch contacts can provide, YES, it would cause other critical engine sensors to start to fail.
Here's a schematic for you.
Look at what the "hot in run and start" (Fuse 15) supplied powers LIGHTING!. That would be enough to draw that current/voltage to cause an issue:
If it were ME, I would replace or service the ignition switch!!
Here's a schematic for you.
Look at what the "hot in run and start" (Fuse 15) supplied powers LIGHTING!. That would be enough to draw that current/voltage to cause an issue:
If it were ME, I would replace or service the ignition switch!!