Help! Just bought 87 GN Dies Won't Start

[short_dustin]

Supposedly it had "new 55lb injectors and a TT chip" I just ordered 60lb flow matched injectors and a 5.7 chip from TurboTweak so I'll install those and we'll see what happens


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[rmar]

55s are high impedance injectors and require a modded ecm to run correctly. Check and make sure what injectors you have.. I have a good 55 TT chip you can use for trouble shooting Dustin.

 

[earlbrown]

I don't think I've ever heard of 55# injectors installed on a unmofified buick ECM. You'll be happy with those 60's and a more modern chip.


When you get your actual TurboTweak chip you'll notice it has a white sticker and says 'TT' on it with your octane and specifics.

 

[Mackinblack007]

I had that same chip in my car in 2000.

 

[earlbrown]

You said you replaced the coil pack early on, did you keep the same ignition module?

 

[short_dustin]

Yeah it's the same ignition module


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[1fastcobra]

I just picked up another Buick and am having trouble. Car runs great very smooth and plenty of power. I drive it about 20 miles and it dies, tried to start it and it backfires. I waited about 20 minutes and it starts right up and runs smooth. I just ordered a scan master so I'll have a little more info from that in a couple days to share. Any help is much appreciated!

Check the crank sensor
My be getting hot.
When u get the chip and injectors (get it running)
Get your self a can of compressed air . Let it run till it dies
Hold the can upside down and spray the sensor for a second
Try restarting the car .

I had the same issue .
This was my problem. Hope it helps



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[short_dustin]

Today I put my new chip and injectors on the car. Did the same thing the second it switched to closed loop. I replaced the O2 sensor and everything is A OK now.


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[short_dustin]

It did idle in open loop WAAAY better with the MAF Translator and LS1 MAF so I guess it was a combination of those two things.


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[rmar]

Cool beans............no need for a shop..lol

 

[short_dustin]

The car is finally running GREAT. It was way better with the new O2 sensor and the MAF and Translator, both definitely helped with idle and a smooth increase of throttle. Today I put a known good coil and ICM on and it's good to go. Yesterday I thought it was fixed but when it heated up and cooled down it started running rough and died. The ignition part must have had a heat crack or something. I can't wait to get my TR6!


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[Nascar83Fan]

Glad to hear you got it going and can enjoy it. Hope it stays that way for quite some time.

 

[short_dustin]

Thanks, I just wanted to get it running right before I start on swapping the motor, trans, turbo and XFI. I want to do one thing at a time to help reduce my process of elimination if something doesn't work out...or when it doesn't work out


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[earlbrown]

The car is finally running GREAT. It was way better with the new O2 sensor and the MAF and Translator, both definitely helped with idle and a smooth increase of throttle. Today I put a known good coil and ICM on and it's good to go. Yesterday I thought it was fixed but when it heated up and cooled down it started running rough and died. The ignition part must have had a heat crack or something. I can't wait to get my TR6!

Normally at ignition module fails with a hot running condition first. Sometimes they flat out die, but most of the time they flake out at temp (and cause bad stuff at speed).

Glad you found the problem.