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I have developed a very erratic idle on my grand national. When the car first starts it ides around 850 rpm, it will do this for a few minutes then all of the sudden jump straight to over 1500 rpm eventually topping out around 2200 rpm. I checked the TPS and at idle it is .40, the IAC with the...

I am hoping someone can tell me the size of wrench I will need to remove the brass adapter that threads into the block for the turbo drain tube. I know the swivel nut on the drain tube is 1-1/16" but I want to know the adapter size on the block.....thanks

Over the winter I installed one of the GN1 1" spacer plates on my intake, I also removed the vacuum in an attempt to clean up the look of the engine. I was wondering what others have done with the plumbing of their PCV valves. I was going to drill and tap a hole into the aluminum spacer, attach...

I am looking for advice on solving my smoking engine issue. This problem started the first time I started the car after storing it over the winter. The smoke was billowing out soon after I drove it on the streets. During the winter I did a little work under the hood, installed new throttle body...

My car is in storage for the winter, I recently have a high pitch sound when I turn the key to the ignition position. I have not been able to pinpoint where the sound is coming from though. It sounds like an alarm of some sort. I am hoping it is caused by a low battery and not something more...

This winter I have eliminated the heater core and AC on my car. I have a question regarding the coolant lines. I have removed the steel lines for the coolant that run beside the passenger fuel rail, that leaves me with a port in the intake and a open port on the water pump. Can I plug both of...

I am hoping someone can tell me what fitting is on the metal corrugated oil drain hose from the bottom of the turbo? I am hoping the connection to the motor is a -10 AN fitting. Can anyone confirm this?

Sorry I don't have a pic of the item, I am trying to find out what is mounted to the top of my passenger side valve cover. It has a electrical connector and what looks like a couple vacuum nipples attached to it. These are not currently connected to anything, it was like this when I bought my...

I am going to remove the hard lines from the fuel rail, I see both lines are connected to a flex line and then a fitting. Does anyone know which fittings these are, is there anything special about these connections? I haven't taken them apart yet but I am hoping they are simple flare style...

I am in the process of running new vacuum lines on a racetronix fuel regulator. It has a small barbed fitting mounted on the top of the dome, I am looking for the thread size of that barbed fitting. To me it looks like a 10/32 but I was hoping someone here just might know the answer.

I just checked out GNX # 161 for sale in Georgetown, Ontario, Canada The car has 3150 miles, one owner and lots of documentation. http://www.legendarymotorcar.com/inventory/1987-buick-gnx-1579.aspx

Hi all I am looking for some help in determining a problem with my friends GN. He was on the highway yesterday and was passing a car at 6 lbs of boost, then dead the engine back fired a couple times and he coasted to the side of the road. Once it was towed back home we started to diagnose the...

I have the opportunity to buy a set of GNX rims, is there any marks on the rims that ensures what I am looking at is authentic? The centers do have the GNX logo on them. I just want to make sure its legit before handing over any cash.

I am looking for a set of front air dams for my 86 Grand National, these are the plastic skirts that hang below the front bumper. Thanks

I am installing a new downpipe and require a 3" test pipe, please let me know if you have one you are willing to sell. Thanks