V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

engine running rough

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Old Jul 20, 2005 | 10:28 AM
  #1  
eagle_eyes's Avatar
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From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
engine running rough

i have this in the tech board...but....

https://www.thirdgen.org/techbb2/sho...hreadid=310489
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Old Jul 20, 2005 | 11:06 AM
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86BLUEBIRD's Avatar
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From: Tampa Bay Florida
Car: 86 Firebird 2.8
Engine: 2.8l v-6
Transmission: auto
could be a problem with the distributor,cap, rotor.
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Old Jul 20, 2005 | 01:28 PM
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eagle_eyes's Avatar
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From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
yeah from what i've been getting in replys, those are probably the things to check out....what is the easiest way to make sure that they are working or not working properly??
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Old Jul 21, 2005 | 10:42 AM
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KED85's Avatar
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From: ****SoCal, USA****
I didn't read other thread
BUT the laundry list includes
the usual
VACUUM LEAKS
TIMING CHAIN (aged & stretched)
Have you checked the stretch on the chain?
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Old Jul 21, 2005 | 11:04 AM
  #5  
2_point8_boy's Avatar
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From: Castaic, CA
Car: 1988 Camaro RS
Engine: 2.8L of Raw POWER!!!
Transmission: Stick Shift
Axle/Gears: 3.42's
With such a sudden thing like this, I would tend to look inot the ignition side definitly. Something you can get to test your ignition system is a special spark plug-like thing. It costs about $20. Basically, it has the outer electrode shaved off, but the gap between the center electrode and the outside is made to take a certain voltage to jump, usually about 25KV, if you get a spark across that, your coil is fine.

The problem with using a regular plug to do this test is that it only takes about 2KV to jump the gap, so if your coil is weak, but puts out 8KV then you get a bitchin' looking spark, but when you put that same spark under compression in the engine, it just can't fire.

Go out in an area that's shaded and out of the sun, then take a squirt bottle full of water. Shoot the plug wires with the water and see if they arc. If they do, ANYWHERE, then you should replace the wires. Cap and rotor are cheep, so I would replace them while you're at it.

This is some simple backyard diagnosis that you can do to help pinpoint the area of your problem.

Hope it helps you out.
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Old Jul 21, 2005 | 12:17 PM
  #6  
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From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
ok, i'll try that out. thanks for the replys
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