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Question for TGP drivers.


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#1 jman093

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Posted 16 March 2017 - 03:35 AM

I have a question for those who have spent a lot of miles behind a TGP. Have you had a lot of problems with the ignition system, namely the ignition module and coil packs? Or is it just me?

 

For the last 3+ years now I have exclusively driven two different TGPs. Both had ICM/coil pack issues when I bought them. I fixed both up fine and both have had issues with the new parts failing again a year or so later. In the past, the issue has been misfiring from one or two coils: misfiring when hot, misfiring under load, or misfiring all the time.

 

This latest issue was different though. The red car which got a brand new ACDelco ignition module and 3 new ACDelco coil packs a little over a year ago. Starting a couple weeks ago, it would run perfectly fine until about 50% throttle and higher, then it would very suddenly bog like mad. No misfire, but it would just have no power, the engine wouldn't want rev past ~3500rpm, and boost pressure would spike. It felt all the world like a weak spark issue sometimes called "spark blow-out." After confirming fuel pressure was good (~52psi under heavy boost), I threw on a set of the allegedly higher-power "blue-bottom" coil packs from a spare L32 I have in the garage. Sure enough the car pulls hard again and pulls hard all the way to redline.

 

I've owned a lot of GM 60V6 and 90V6 engines, and wrenched on hundreds more, and although I've seen plenty of coil packs and ignition modules fail here and there, I've never seen anything like the temperamental nature of the ignition system of my TGPs. And that makes me wonder if the stock system is rather weak for a boosted application (especially one making more boost than stock like my red car does) and the slightest decline in output leads to issues.

 

So I'm just curious to hear if other long-time TGP drivers are in the same boat. How has your car done?


Jesse M.

Variety is the Spice of Life.

 

1990 Turbo Grand Prix

1990 Turbo Grand Prix

1990 Turbo Grand Prix


#2 digitaloutsider

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Posted 16 March 2017 - 04:07 AM

Gen II 6/60s tend to eat coil packs as they get older because of their proximity to the exhaust manifold.  The ignition system isn't weak as these coils are driving plenty of 350+ HP 3800s.  The parts just get old and baked and it does them in.


Shaun

 

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#3 GOT2B GM

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Posted 16 March 2017 - 03:47 PM

Perhaps the added heat of having a turbo underhood accelerates the degradation of the coil packs. As stated, they are in a bad location for heat soak. Sent from my SM-G935W8 using Tapatalk

Matt Shantz

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#4 redgrandprix

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Posted 17 March 2017 - 01:57 AM

Ive put around 40k miles on my tgp and i had 1 coil pack go out but it was a msd i believe. Swapped out for ac delcos and taylor wires. Havent had an issue since Sent from my SM-N900T using Tapatalk
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#5 GabsOlds

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Posted 18 March 2017 - 09:23 PM

Relocation of the coils in order?


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#6 jman093

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Posted 19 March 2017 - 02:45 AM

Relocation of the coils in order?

 

No, they are in the same spot on a TGP as every NA 3.1 that do not have my issues. If anything, a TGP has lower underhood temps because of the hood vents. Those really work.


Jesse M.

Variety is the Spice of Life.

 

1990 Turbo Grand Prix

1990 Turbo Grand Prix

1990 Turbo Grand Prix


#7 EMNCFI

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Posted 21 March 2017 - 07:13 AM

I have never had a coil problem, I think I have replaced them once, have owned my TGP since 1997, so I have a few hours behind the wheel
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