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Car suddenly wont start

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Old Apr 18, 2011 | 08:50 AM
  #1  
92 R3DB!RD's Avatar
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Joined: Sep 2009
Posts: 9
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From: Tulsa, OK
Car: 1992 Pontiac Firebird Formula
Engine: 5.0L LO3 TBI
Transmission: 700R4 Automatic 4spd
Axle/Gears: 2.73
Car suddenly wont start

Ok, i have a 92 formula with a 305 tbi and 700r4 /w OD. my problem is that friday as i was pulling into my drive way i went to give it gas and it just died. i tried to start it back up but it acts as though its not getting a spark. i know its not in the fuel system, as it still injects fuel. ive replaced the coil pack, but to no avail. its never had trouble starting before and its never had any vibrations or misfires or anything of the such. when it died it didnt bog out of any thing it just died. can someone please help me out with this seeing as my car is my only means of transportation thanks
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Old Apr 18, 2011 | 09:00 AM
  #2  
Zaar's Avatar
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Joined: Apr 2011
Posts: 49
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From: Delaware
Car: 1988 Iroc-Z tpi 5.7
Engine: ls2
Transmission: 4l80e
Axle/Gears: 3:42
Re: Car suddenly wont start

ok dude did you check spark by having some one crank the engine take one spark wire off the plug put a screwdriver into the spark wire then aim it at a grounded area while doing so make sure you arent holding the screwdriver or have one thats insulated as such, then watch for spark. if you get spark then hit me back ill give you some other things to check for before you go spending money on parts take the time and troubleshoot properly...it may possibly be a dead relay or if you already checked the fuel pressure and the two injectors on your hopper are jetting fuel it could be due to a multitude of problems tps sensor flatspot, or ecm issues did you check your fuses? is everthing grounded properly etc...
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Old Apr 18, 2011 | 09:28 AM
  #3  
ASE doc's Avatar
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Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Car suddenly wont start

The HEI ignition module is a common failure item. As is the pick up coil on higher mileage cars. The pick up coil is in the distributor beneath the rotor. The ign mod is also in the distributor. After checking spark, check for power at the pink wire to the coil with the key on. If no power, check the fuse links at the junction block by the battery or at the starter. If you have power to the coil, check for pulse at the white wire to the coil. Use a 12v test light while a helper cranks the engine. The light should flash when held to the white wire. If not, remove the ignition module and take it for testing at Auto Zone or NAPA. Use an ohmmeter to test the pick up coil. It should read 800-1000 ohms. The pick up coil connects to the back of the ignition module in the dist. Its connector has one white and one green wire.
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Old Apr 18, 2011 | 09:49 AM
  #4  
Zaar's Avatar
Junior Member
 
Joined: Apr 2011
Posts: 49
Likes: 0
From: Delaware
Car: 1988 Iroc-Z tpi 5.7
Engine: ls2
Transmission: 4l80e
Axle/Gears: 3:42
Re: Car suddenly wont start

couldn't of said it better doc! just remember if its the ignition module make sure to use the die electric grease on the plate they get super hot and fail repeatedly when baked, also the aftermarket modules from pepgirls and autozone fail quickly replace it with a oem unit or performance module...
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Old Apr 18, 2011 | 10:07 AM
  #5  
ASE doc's Avatar
Supreme Member
 
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Car suddenly wont start

Good point on the dielectric compound.
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Old Apr 18, 2011 | 01:05 PM
  #6  
92 R3DB!RD's Avatar
Thread Starter
Junior Member
 
Joined: Sep 2009
Posts: 9
Likes: 0
From: Tulsa, OK
Car: 1992 Pontiac Firebird Formula
Engine: 5.0L LO3 TBI
Transmission: 700R4 Automatic 4spd
Axle/Gears: 2.73
Re: Car suddenly wont start

all fuses are good and using a test light i confirmed that the coil pack is sending a spark, but im not getting anything to my plugs..thanks again for the quick reply
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Old Apr 21, 2011 | 09:04 AM
  #7  
ASE doc's Avatar
Supreme Member
 
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Car suddenly wont start

You say you verified spark at the coil with the test light? That doesn't sound right. Did you use the test light as a spark tester or did you just get a flash at the white wire? If you get a flash at the white wire and no spark, replace the coil. If you are actually getting a spark from the coil wire, determine wheter it's the coil wire, the cap, or rotor that is causing the spark not to reach the plugs. Be aware, the rotor can short to the distributor shaft causing the spark to ground out. This isn't always obvious and you have to look for signs of carbon tracking to find it.
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Old Apr 27, 2011 | 09:14 AM
  #8  
BOSS HOGG LOU's Avatar
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Joined: Feb 2011
Posts: 49
Likes: 0
From: Georgia
Car: 87 IROC Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: BW 9 Bolt
Re: Car suddenly wont start

I'm subscribing to this thread just to run through that checklist ASE doc prescribed. My ride won't start either.
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