3.4 V6 paired misfire? - Team Camaro Tech
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Old Apr 21st, 07, 08:03 AM   #1 (permalink)
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3.4 V6 paired misfire?

I posted this on a V6 Camaro/Firebird board but I thought I'd throw it out here as well.

'94 Camaro 3.4

It has a misfire on #3 & #6. I can actually see the random misfire by connecting my timing light to those two plug wires. All other cyls are smooth as can be. Plugs and wires are okay.

I replaced the 3-6 coil with no results.

Replaced the ignition module, no change after that either.

Removed the harmonic balancer and inspected the relucter for damage, it was okay.

What else could cause the 3-6 coil to randomly misfire? Seems like the cam or crank sensors wouldn't just pick on this one coil or am I wrong to think that.

Thanks for any help.

Edit: I should also mention the car has been diagnosed at a Chevy dealer and a local Auto repair shop and neither could determine a problem with their scans.
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Last edited by rojo; Apr 21st, 07 at 08:23 AM. Reason: additional info
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Old Apr 21st, 07, 11:25 AM   #2 (permalink)
 
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Re: 3.4 V6 paired misfire?

possibly a dis module...maybe you could trade yours with a friend for a day to diagnose, cause they`re kinda expensive to replace, and find out it still doesnt work right...lol...
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Old Apr 21st, 07, 11:47 AM   #3 (permalink)
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Re: 3.4 V6 paired misfire?

I replaced the Ignition Module. Is this the same thing you are calling the dis module?
http://www.partsamerica.com/ProductD...pe=194&PTSet=A
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Old Apr 21st, 07, 11:53 AM   #4 (permalink)
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Re: 3.4 V6 paired misfire?

The quickest route to determining where the miss is coming from is to hook on to a lab scope and view the spark lines for each cylinder. If you have someone who actually knows what they are looking at when you do it they should be able to determine fairly quickly as to it being air or fuel related or coil/wire/plug related or so on and so forth.
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Old Apr 23rd, 07, 03:29 PM   #5 (permalink)
 
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Re: 3.4 V6 paired misfire?

if you can see the miss in a timing light, then its in the ignition, and not the air/fuel...yes, the module you replaced is what i`m calling the dis(distributorless ign module)sorry...i read right past that...i dont think the cam sensor will have any effect on the 3-6 skip you`re experiencing...you said the pick-up ring was good, so i dont think the crank sensor would do this either...usually whan a crank sensor is doing this, there is metal inbetween the grooves of the pick-up ring...the sensor will then pick up 1 long signal for a shared coil, and randomly miss between paired cyls...
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Old Apr 24th, 07, 07:00 AM   #6 (permalink)
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Re: 3.4 V6 paired misfire?

Thanks for the replies. I read somewhere on the net where the interrupter ring (I called it relucter by mistake above) could become magnetized on certain blades and could actually cause my problem. So I pulled the balancer once more to check and it was not magnetized. I'm going to replace the 24x crank sensor while I have the balancer off even though like you I don't really see how it could pick on just one coil. It's $29.00 so it might be worth it just to take it out of the equation.
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