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I recently just got back from a 600 mile trip in my GN. Car ran fine. No issues. Until I boost. Now, granted we were stuck with 91 octane but I ran some booster to bring it up one night because we were going to do some pulls in our cars. I notice that when I boost, my wideband afr pegs to 10...

I've been chasing a couple of small issues the last year or so. I don't drive the car much this year because I moved and other life stuff got in the way. Anyway, I try to get the GN out at least 1-2 times a month to waken things up and put about 10-20 miles on each time. Mostly, as I've...

I was doing an oil change on my 86 GN today with my 10 year old nephew. We spent hours in the garage just tinkering around. It was his very first oil change and it was in a GN. We went for a ride and his exact words were, “this car is so cool.” I think we might have another member of the...

Finally got the GN out of hibernation. I had to get it to the shop to do ball joints and replace the extension housing bushing (brass bushing with the dimples in it). We couldn't figure how to get the damn thing out. Is there a special puller that we need for this? The pullers we had didn't...

Getting really close to having my list of things to do to my 86 GN done. So far, I've gotten rid of my KR completely at 17psi, fluids all done, body bushings done, 235s on all four wheels, replaced the PS motor mount and oil pan gasket (cork) yesterday, and fixed my broken pipe mount after the...

In the times of quarantine, I get to work on my TR more than ever now. Finally got the scanmaster permanently installed along with the original radio. You need tunes man. Speaking of tunes. I am getting some small knock in about 16-17 psi of boost (no higher than 3). My AFR wideband shows...

I've been doing some searching on this sitee to find a cam sensor for my 86 GN. Sucker is noisy when cold and seems like it's a pretty common problem. Yes, it's the cam sensor. Stethoscope proved that. Anywhoo, I've found the sensor at Highway Stars but it's $400! Since the world is on fire...

Since the search doesn't seem to work and I'm doing my first oil change since getting the car about 1 year ago (Chicago winters keep it in the garage), asking what oil everyone is using in their TB. Right now, it's got 10W-30 Mobile 1 synthetic and a PF52 filter. I'm leaning towards brad penn...

My driver side exhaust manifold was cracked pretty bad so I had an annoying exhaust leak. I ordered a replacement Poston style from oldbuickparts.com and they shipped it to me without a gasket. I got it put on with some RTV and the thing leaks like a sieve now. So bad it's kind of...

Looking for an 86 Black and Chrome grille for my GN. Although I like the blacked out one I have now, want to go back to original. Not looking for pristine but nothing broken either.

First of all, I'd like to start by introducing myself. My name is Steve, I'm a 37 year old IT professional born and raised in Chicago. I've been a car/bike nut my whole life. Throughout the years my family has collectively owned a lot of cool cars. My father had a 66 K-code convertible...

Hey all, I've been posting to the site here and there with some questions I've been having with my newly purchased 86GN. I purchased the car about 5 months ago and have been doing some work to it to get it perfectly roadworthy. Not that it isn't drive-able but it's one of those cars that runs...

I've had my 86 GN for about 5 months now. It's super clean and runs great. I just recently replaced the upper control arm bushings on the PS, replaced the failed powermaster, and did all new body bushings with the added GNX bushings. What a difference. Next up are replacing the DS exhaust...

Hey all. I'm replacing the aftermarket radio from the previous owner to the stock one but he chopped the original plug for the radio off. Does anyone have it laying around they are willing to part with?

I have a PM brake switch from Kirban's that was fitted to my PM in thinking the switch was shot. Turned out it wasn't and the pump was bad so I converted to vacuum. Willing to let this go for $100 +shipping. Let me know.

I've been searching the forum for weeks and got so much info on charging my 86 GN ac system. I just have a couple of followup questions as I'm not used to these older R12 systems. My friend is an HVAC specialist and was helping me out. We found that the high pressure schrader valve had a...

Hi all, I've had my 1st GN (1986) for about 3-4 months now and doing the normal fixes to it. Cracked DS manifold, powermaster failed, oil leaks (small ones) but the car runs and drives great and is properly quick. Well, I had it out on Sunday and was really getting on it, came back to the...