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erratic spark at plug wires

Old Jun 2, 2008 | 02:20 PM
  #1  
ROTICKA's Avatar
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From: Missoula Montana
Car: 1984 T/A
Engine: 5.7L TPI
Transmission: 700R4
erratic spark at plug wires

350 TPI. I just had the injectors replaced. Changed the plugs and wires yesterday. Hooked up my inductive pickup timing light to check timing. The light does not flash steady. There seems to be somewhat of a pattern to the flashes but it stops flashing, flashes a few times, stops flashing, flashes once, stops flashing, etc. What components would you say are the culprit? I swapped the distributor out with another one I had and still the same problem. I replaced the coil, dist cap, and rotor last summer. But haven't checked the timing for quite a while. Thank you.
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Old Jun 2, 2008 | 04:54 PM
  #2  
Batass's Avatar
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Joined: Mar 2005
Posts: 1,665
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From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: erratic spark at plug wires

Whats it run like?

Some timing lights do that, they just don't pick up a good signal, especially if you have some good wires.

You pretty much swapped/replaced everything.
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Old Jun 3, 2008 | 08:57 AM
  #3  
ROTICKA's Avatar
Thread Starter
Junior Member
 
Joined: Mar 2005
Posts: 59
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From: Missoula Montana
Car: 1984 T/A
Engine: 5.7L TPI
Transmission: 700R4
Re: erratic spark at plug wires

It seems to run alright, a little hot temp wise. But I guess you're right, if it was really missing as bad as the light says it is, it probably wouldn't run at all. Should I just try a different timing light? By the way The plug wires I bought and installed are $26.99 7mm omni spark junk, and the timing light was just used two nights before on my dads truck. At that time it worked perfectly (350 TBI). Still think it's just the light? Thoughts, opinions?
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Old Jun 3, 2008 | 11:05 AM
  #4  
Batass's Avatar
Supreme Member
 
Joined: Mar 2005
Posts: 1,665
Likes: 3
From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: erratic spark at plug wires

I forgot to ask, did you disconnect the wire plug from the distributor when you checked it? I think its called the ecs plug? If not, it will give a faulty reading.
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