93 T/A wont start at key, jumped starter and it starts but runs terrible & backfire
#1
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Here's the story. Car has always ran fine since I've had it (8+ years). Drove it as usual one day, parked it, everything was fine. Got in it about a month/month and a half later (its not a daily driver) and it will not start but fuel pump runs, usual dings, just the starter isn't turning or even trying to. So I checked all fuses/relays. All are fine. Try shorting the starter and it starts that way and it runs, but runs terrible!! It is very hard to keep running (we couldn't keep it running), and continually backfires. Flames shot through the intake. I have done nothing to this car the whole time it sat, so this is weird/very unfortunate. I'm wondering if the VATS system is the culprit? Or is there something on the car that would make it run that bad and not start at the key? I'll be pissed if it actually has 2 totally different problems just from sitting for a month. Thanks!
BTW, its the 93 T/A in my sig.
BTW, its the 93 T/A in my sig.
Last edited by moderate Z28; 10-27-2013 at 04:58 PM.
#2
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
It will actually idle fairly good if I spray starting fluid in it but only until it runs out. Gave it some gas one time and saw the biggest flame ever out of the intake. Actually caught a few pieces of grass on fire that were siting on the radiator cover!
#4
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
#6
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Security light doesn't even light up. I may have removed that bulb years ago. I've had this car about 9 years and its always ran great. I'm having a hard time believing that these 2 problems are completely separate since the car ran fine when I parked it. That would be some **** luck.
Last edited by moderate Z28; 10-28-2013 at 11:42 AM.
Trending Topics
#8
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Havent checked the grounds yet. The car stays in a nice garage. Never outside. I also just noticed that the backup lights now illuminate when in neutral. It never did that before. I don't think that has anything to do with it though, just got out of adjustment. I have tried to start it in any gear, and moving the steering wheel up and down.
#9
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
OK so far I have checked the neutral switch (bypassed it, still no start), crank fuse has 12 volts while cranking, and took the gauge cluster out to check the security bulb. I tried 2 different cluster bulbs for the security light, one I KNOW works because seconds before it was the air bag light and I saw it working. Security light NEVER comes on, not even when your first turn the key. What would cause that? I'm pretty sure it was coming on before, like normal (light up for a few seconds and turn off). I know for a fact the security light is supposed to come on when you turn the key, and then go off after a few seconds. This is weird. My 95 T/A is right next to this one, so I might try its complete gauge cluster and see if it works.
#10
Village Troll ![](http://jameskellock.tripod.com/sitebuildercontent/sitebuilderpictures/rsman.jpg)
![](http://jameskellock.tripod.com/sitebuildercontent/sitebuilderpictures/rsman.jpg)
iTrader: (2)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Fire out of the intake is more than likely a timing issue. Fuel is being ignited while an intake valve is still open. Are you absolutely sure all plug wires are on their proper plugs? That is the easiest place to start. Could also be the rotor screws in the opti are loose.
#11
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Fire out of the intake is more than likely a timing issue. Fuel is being ignited while an intake valve is still open. Are you absolutely sure all plug wires are on their proper plugs? That is the easiest place to start. Could also be the rotor screws in the opti are loose.
This security light deal has me puzzled?! Im going to swap in the complete gauge assembly from my 95 T/A into this one tonight and see if the security light still doesn't come on. before I can diagnose why its not running right, I need to atleast be able to start it from the key. This is just weird. 2 major problems all at once. What are the chances. Its hard for me to believe they couldn't be related.
#12
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
GOT IT TO START! but not run yet. Atleast I can start it by the key now. Guess what it was? It was the theft deterrent relay. I guess the chip in my key went bad or something. I bypassed the relay and she started and ran good for 3 seconds and died. Wouldn't start anymore. Must be the injectors getting shut down. Im going to buy the bypass box so the injector receive the signal. Anyone know exactly where the fuel enable wire is and the best place to wire in the VATS bypass box?
#13
Staging Lane
Join Date: May 2013
Location: Chicagoland
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I'm pretty sure Rob (shbox) has a good write-up on bypassing VATS. I think you just need to wire in a resistor that matches the resistance of your key.
Alternately, I also have a hotcam tuned by the Madtuner. Twice this summer on a cold engine it started and ran poorly and died right away, it wouldn't restart until I floored it while cranking (clear flood mode), then all was normal.
Alternately, I also have a hotcam tuned by the Madtuner. Twice this summer on a cold engine it started and ran poorly and died right away, it wouldn't restart until I floored it while cranking (clear flood mode), then all was normal.
#14
TECH Resident
Thread Starter
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I'm pretty sure Rob (shbox) has a good write-up on bypassing VATS. I think you just need to wire in a resistor that matches the resistance of your key.
Alternately, I also have a hotcam tuned by the Madtuner. Twice this summer on a cold engine it started and ran poorly and died right away, it wouldn't restart until I floored it while cranking (clear flood mode), then all was normal.
Alternately, I also have a hotcam tuned by the Madtuner. Twice this summer on a cold engine it started and ran poorly and died right away, it wouldn't restart until I floored it while cranking (clear flood mode), then all was normal.
Ive had the tune for about 5 years. Never had a problem although I think it would run a little better with a dyno tune.