IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: TurboCajun on March 26 2013, 06:46:03 PM

Title: need help with gn
Post by: TurboCajun 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.

Title: Re: need help with gn
Post by: Steve Wood 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

Title: Re: need help with gn
Post by: Steve Wood 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

Title: Re: need help with gn
Post by: TurboCajun on March 26 2013, 07:16:54 PM

thanks Steve I will relay the info

Title: Re: need help with gn
Post by: TurboCajun on March 26 2013, 07:17:33 PM

Oh and my car is running great  :rock:

Title: Re: need help with gn
Post by: Steve Wood on March 26 2013, 07:24:57 PM

bet it seems like a totally different car!  I am glad to hear that! :)

Title: Re: need help with gn
Post by: TurboCajun on March 26 2013, 07:40:10 PM

it sure does

Title: Re: need help with gn
Post by: TurboCajun 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.

Title: Re: need help with gn
Post by: Steve Wood 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

Title: Re: need help with gn
Post by: TURBOPOWERED68 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 

Title: Re: need help with gn
Post by: TurboCajun on April 02 2013, 08:05:41 PM

it was a bad injector, brand new out the box,

Title: Re: need help with gn
Post by: Steve Wood on April 02 2013, 10:20:41 PM

That was relatively easy.  How about the berserk dash?

Title: Re: need help with gn
Post by: TurboCajun on April 03 2013, 04:01:58 PM

we havent tackled that problem yet