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Offline TurboCajun

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need help with gn
« on: March 26 2013, 06:46:03 PM »
I am trying to help a friend who is working on a GN. so far they have changed module, coil pack, injectors, tt chip, te-60 turbo, ta-headers. the engine seems to idle fine but as soon as you put it under load it has a miss, at one point they pulled the plug wires one at a time while running and the #5 had not change, pulled the plug and cleaned it and it fired on the valve cover so they put it back in. still the same. checked injetor harness with noid light, all were good. i let them use one of my MAF sensors ( at idle 5) , his MAF was jumping between 6-15 at idle. one thing i would like to mention is that he has a digital dash and it is freaking out just numbers on a non stop loop.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: need help with gn
« Reply #1 on: March 26 2013, 06:54:14 PM »
have they put a new plug in #5?

Make sure the coil module assembly is bolted tightly to the bracket and the bracket is tight to the intake....no powdercoating on the contact points of the bracket
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Steve Wood

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Offline Steve Wood

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Re: need help with gn
« Reply #2 on: March 26 2013, 07:09:19 PM »
Be sure #5 has good compression as well

Also, GM warns against pulling wires off while running as it can damage the coil or module
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: need help with gn
« Reply #3 on: March 26 2013, 07:16:54 PM »
thanks Steve I will relay the info
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TurboCajun

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Re: need help with gn
« Reply #4 on: March 26 2013, 07:17:33 PM »
Oh and my car is running great  :rock:
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: need help with gn
« Reply #5 on: March 26 2013, 07:24:57 PM »
bet it seems like a totally different car!  I am glad to hear that! :)
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: need help with gn
« Reply #6 on: March 26 2013, 07:40:10 PM »
it sure does
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TurboCajun

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Re: need help with gn
« Reply #7 on: March 27 2013, 10:26:23 PM »
ok put new plug in #5 , still the same, I let them try my extra ECM, still the same. checked compression its good, started pulling injector wires while it was running and the #5 is not working but the wire is with a noid light. tomorrow they will move the injector to a different cyl. to see if it follows. the digital dash is still freaking out with my ECM.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: need help with gn
« Reply #8 on: March 27 2013, 11:24:01 PM »
easy to be a bad injector.  If it was ignition, you would have both cylinders not firing unless it was a plug wire problem.

I don't have much experience with digital dashes...only had one car a short time with one.  The chip could be bad, or a bad connection with the plug, or some big, leaky spark problem.   John Spina might offer some suggestions if you can get him on the phone at Caspers
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Steve Wood

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Offline TURBOPOWERED68

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Re: need help with gn
« Reply #9 on: March 28 2013, 12:22:46 AM »
#5 is at it again  :chin:
on my car
the #5 injector's pin would work its way out of the socket at the ECM.
i finally replaced both the ecm's sockets/plugs and replaced all questionable pins and that problem was solved. 
good luck 
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Offline TurboCajun

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Re: need help with gn
« Reply #10 on: April 02 2013, 08:05:41 PM »
it was a bad injector, brand new out the box,
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: need help with gn
« Reply #11 on: April 02 2013, 10:20:41 PM »
That was relatively easy.  How about the berserk dash?
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: need help with gn
« Reply #12 on: April 03 2013, 04:01:58 PM »
we havent tackled that problem yet
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft
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