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Engine dies when keys is release.

Tiny
PETERMK3
  • MEMBER
  • 1989 TOYOTA SUPRA
  • 60,000 MILES
My eletric fan die, so I did a by pass to my main relay and it kill my engine (i did this by [ass a few time and it didnt die). Though that it was an ignition switch, went to the junk yard and pulled one out and put it into my car but still didnt work. Any answer?
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Friday, June 29th, 2012 AT 10:04 AM

18 Replies

Tiny
MIKEDEROUIN88
  • MEMBER
  • 137 POSTS
Does the key stay forward or bounce back? Is it the same as before u changed it? And by ignition switch do you mean where the key goes or the electrical switch?
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Friday, June 29th, 2012 AT 10:26 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
When ignition switch is in run position, are the dash indicators lights showing on dash?
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Friday, June 29th, 2012 AT 3:00 PM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
Ok mike, when I turn over the key, the engine starts but once I let go of the key it dies. I have a cousin(use to work with the deal for 20 yrs now) that came and look at and try it too. He say that there no power to the switch so that the key switch will stay on.
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Saturday, June 30th, 2012 AT 8:01 AM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
The key does not bounce back or go forward. Yes it where the key goes but the electrical switch is behind where the keys goes. Yup it still the same with the pulled one and the original one.
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Saturday, June 30th, 2012 AT 8:07 AM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
Ok khlow, when the I turn over the key( I have to hold the key for the engine to turn on), none it the light indicator is on. When the ignition is on, all the indicator is on tho.
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Saturday, June 30th, 2012 AT 8:18 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is vehicle with or without turbo? Does applying slight pressure on the accelerator keep the engine running?
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Saturday, June 30th, 2012 AT 4:06 PM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
Ok khw, it a jdm 2jz twin turbo. It not the orginally engine. The old 7m blew out on me when I took it to my buddy house to fix it. Yes I have to put slight pressure on the key to make the engine running (not sure if im in the dame page as you). If the engine on, and I step the peddle for the gas, it just rev, and once key is let it go then it dies.
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Saturday, June 30th, 2012 AT 8:53 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Keep your foot on the pedal and release the key, dioes it stall? I need to find out if it is the idle control system that is the cause.

If any repair work was carried out underhood, check the MAF and air hose installation.

Did you check for trouble codes?
Is the MIL indicating?
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Sunday, July 1st, 2012 AT 8:04 AM
Tiny
MIKEDEROUIN88
  • MEMBER
  • 137 POSTS
Sounds like the electrical switch behind the lock cylinder has failed. I would start there to cut expenses.
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Monday, July 2nd, 2012 AT 5:01 AM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
To khl, even if I step on the gas peddle and let go of the keys it still die. It a customize engine to a ma70 body. Mine does not run maf, it run a map instead. Cuz a japenese spec engine not a us spec.
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Monday, July 2nd, 2012 AT 8:10 AM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
Ok mike, I know it the electric switch, but I got another at the junkyard and still the same. It like there no power to keep the switch on.
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Monday, July 2nd, 2012 AT 8:13 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
There are a few possibilities for this and the ignition switch was my initial thought but you mentioned replacing it so I did not go in that line. There is a possibility the replacement switch is bad as well and we shall start with the basics.

Get a test light or DVOM.

At the igniter or EFI resistor, check the Black/Orange wire for battery voltage with ignition switch turned on. There must be battery voltage. If available, start engine and if it stalls, do not turn off ignition key, recheck the Black/Orange wire for battery voltage.

Turn on wiper or turn signals to see if they works.
At fuse block # 1, check the ENG fuse (15 A) for battery voltage.

At ignition switch there are 6 wires. Do you have battery voltage at the White and White/Red wire?
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Monday, July 2nd, 2012 AT 2:39 PM
Tiny
PETERMK3
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  • 10 POSTS
Ok khl, me and my cousin test it out the old switch, but the were no volt coming through one of the wire, I for got which one was it. I think it was the white wire.
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Friday, July 13th, 2012 AT 11:06 AM
Tiny
KHLOW2008
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  • 41,815 POSTS
You have to be specific. The wrong information would get you nowhere.

If it is the White wire that does not have any power, are the following components working?

A) Door locks?
B) Power seats?
C) Power windows?
D) Headlight cleaner?

If all above do not work, check the underhood fuse box AM1 (40 A) fuse.
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Friday, July 13th, 2012 AT 1:11 PM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
All the above work khl.
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Friday, July 13th, 2012 AT 9:22 PM
Tiny
KHLOW2008
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Please reconfirm the wire at ignition switch that does not have any battery voltage.
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Friday, July 13th, 2012 AT 9:31 PM
Tiny
PETERMK3
  • MEMBER
  • 10 POSTS
Khl, I got it fix now. I took to guy that did a swap on my car and found out what was the problem. I did short the main relay that was the fuse box under the hood had to change the how fuse box. Ok there was two more problem about the car. First off the car dies when im on the freeway and shifting it bac ti netrual. Second is that when my headlight turn on and wen I brake, the brake light comes on at the dash board.
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Wednesday, July 18th, 2012 AT 10:18 AM
Tiny
KHLOW2008
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For the stalling in neutral, check the engine idling.

For the brake light indicator turning on, check the taillights ground connections.
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Wednesday, July 18th, 2012 AT 3:02 PM

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