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I must sell my gorgeous 1986 GN. located in SW Connecticut. I am thinking of running an ad in Hemmings classified but thought I would try the forum first. This is a great opportunity to buy an immaculate intercooled Grand National with all the best original options PLUS a huge basket of...

I finally replaced the crappy Speedhut boost gauge with a new one. It calibrates to actual barometric pressure every time the engine starts. The instructions say it has to be wired to a 12V source that doesn't cut out during cranking in order to calibrate properly. Sure enough if you just wire...

My son is getting into the Buick act. He just bought a 1998 LeSabre. It needs some work but we are having difficulty finding a part. It's the torsion bar that connects the two trunk hinges to make the trunk stay up when you open it. The original part number is 25677957 or 25677958 (identical)...

Hi Eric, Last month I only had a few 0-70 mph logs which were not enough for you to rally evaluate. I got to Lebanon Valley Dragway today in near perfect conditions and got in three runs, The first was aborted by me at around 85 mph due to KR signal on the scanmaster. 2nd run had tiny knock at...

Unlike more rabid racers, I only tune once a season. I was wondering if there is a guide for adjusting for temperature changes? For example, Saturday I will spend the day at Lebanon Valley Dragway finishing up my tune. The temperature will average low 80's if the weather gods are accurate and...

Last year I installed a wideband A/F sensor and a powerlogger in my 86. This year I am finding it invaluable for tuning but I just realized that it makes it easy to determine the 0-60 mph times as well. "I just load a file and then look at the elapsed time between the last "0 mph" and the first...

For years, whenever I re-adjust the tps to a .42 volt idle, it always automatically showed 4.6 at WOT. I just took it out for a few logged runs at WOT and I could feel it wasn't doing it's normal thing so I checked the tps. Idle was right on at 4.2 but WOT was only 4.25. Can the tps be adjusted...

After several years of trying to make my 86 as near perfect as I can I am down to the very small stuff. I have noticed from the beginning that the metal Garrett tag on the intercooler is missing. It's definitely an original intercooler although who knows if its the one that came with the car...

I am reaching out to all you electrical gurus for help. I can’t think of anything else to try. I have a Speedhut digital boost (only) gauge in my 86. It came with the car when I bought it. It worked fine for years. This Spring I made some changes including the installation of an AEM A/F gauge...

Hi everyone. I have had a set of Speedhut digital gauges in my 86 since I bought it four years ago. They all worked fine except the fuel pressure gauge which developed a strange malady a while back. If I just turned on the key, it would initialize properly. But if I then started the engine it...

After a complete restoration of my 86 that included new doors, the power window switch on the drivers side became intermittent. I replaced the switch, used a bit of dielectric grease in the pin holes and carefully made the connection and reinstalled the blue plastic "hat" on the long pin. Still...

Like many of us, I don't drive my GN from Thanksgiving until Easter. Each year I check TPS and IAC readings to get off on the right start. I usually start with an IAC setting of 10 and rarely have to touch it after that because it stays within that 0-20 range all season long. I have developed...

I’ve been wondering about the location of the MAF sensor in or GN’s, I have the cold air kit that puts the filter under the driverside bumper. The MAF sensor is located in the tubing BEFORE the turbo. I think this is a stock location. So I am thinking that, due to boost, the air coming into the...

I’ve been wondering why the O2 voltage on all of our GN’s jumps around so much while the wideband a/f ratio seems steadier. It seems that this is intentional. I have read that the computer adjusts fuel a zillion times a second to cause the voltage in the sensor to jump over and under a central...

Just when I thought I was getting it I went confused again. Here goes. I understand that our GN's have a "return type" fuel system where essentially the computer uses the fuel it needs for load and speed and returns excess fuel to the tank while maintaining a constant pressure. (My particular 86...

It's spring and time to continue my testing and tuning (now with my soon to be installed wideband a/f sensor and powerlogger) Always looking to protect my precious rebuilt motor so I still anguish a bit about doing the whole run in drive even though the calculators say I am way safe even up to...

I feel like a total spaz but here goes. I need to see my turbotweak chip to make sure it matches my car. The chip came with the car which had a lot of engine mods. Anyway I have read how to get at it but I can't seem to figure out how to remove the panel (I'm not kidding) I popped the little...

I've been wondering about two things. One is my IAC setting. I have no trouble setting a warmed up engine to an IAC setting of 10. It will stay there for days and then one day it will be at 35. Next day it might be back to 10. So I am wondering what might affect the reading after it is set...

My 86 GN has the usual power upgrades and a scanmaster with the turbo tweak chip so I have some control over fuel in all gears and also 1st gear alone. I would like to install a permanent a/f sensor in the bong in my downpipe and a digital gauge and software to record data over a complete run...

So I have ben driving my rebuilt 86 engine since May and it ha been flawless Starts right up, idles smooth as silk. I had adjusted the TPS to 42 and the IAC setting to 18. This has stuck all year. This morning (in Connecticut) it was a bit cold and when I cranked the engine it would not stay...