Hey Everyone,
I picked up a 1987 Buick Grand National roughly a year ago. This car sat for about 15 years due to an accident. The previous owner who was a family friend had the engine apart doing some maintenance. It received new valve springs, water pump, thermostat, ported the dog house and an adjustable fuel pressure reg.
When I got the car I emptied the tank, replaced it with a used Racetronics 255 the car came with and put the rest of the engine back together. I went to start the car with no luck. After beating my head against the wall for awhile I decided to pull the injectors out and found out they were extremely nasty and weren't firing. The car also came with new 60 lb injectors and turbo tweak chips to go with it for 93 octane and E85. I was going to wait to put them in until I got the car running but since I was having issues with the stock stuff I put the bigger ones in and the 93 chip. After getting everything back together the car fired right up and ran pretty decent with all things consider.
I did some driving around the block afterwards for awhile and ran into an overheating condition. The car got to 230 degrees when I finally got it parked back home. I popped the radiator cap and the engine had some pretty bad corrosion which ended up plugging the radiator. i put the original radiator back in which leaked from the wreck but took care of the overheating problem. I ordered a gn1 aluminum radiator which I was extremely pleased with the quality.
While I was waiting on the radiator to show up my dad and I decided to realign the body panels since the new ones were just tossed on after the wreck. I also switch the heater box out with a grand national one since someone had put a stock regal one in by mistake.
After getting the car back together with the new radiator I was finally ready to take it for a real test drive. I took it down the street for fuel and threw about a half tank in it. Almost instantly afterwards the car started back firing and breaking up with any throttle at all. The scan master drops to around 500 milli 02 volts when this happens so it seems to have a lean condition.
I was told this is a sign of the factory maf having problems. I ordered a ls1 maf and a maf translator which didn't change the symptoms at all. After that I threw a decent amount of money in it and replaced the ignition module, coil pack, plug wires and plugs. This also didn't change anything. This was last November and it was getting cold here in Iowa. I decided to throw in the towel for the winter. Now that its spring I'm starting to take a look at it again hoping I can get it fixed.
The only other thing I found is two wires that were disconnected on the back of the passenger head. One wire is while the other is black with a while spring. I intially assumed these were engine groups and grounded them to the intake manifold bolt which doesn't seem to of changed anything. Can someone confirm if this is an engine ground, if the intake manifold bolt to the head is a decent spot and could I of hurt the engine letter it run without these grounds?
Any help would be greatly appreciated!
Thanks,
Matt
I picked up a 1987 Buick Grand National roughly a year ago. This car sat for about 15 years due to an accident. The previous owner who was a family friend had the engine apart doing some maintenance. It received new valve springs, water pump, thermostat, ported the dog house and an adjustable fuel pressure reg.
When I got the car I emptied the tank, replaced it with a used Racetronics 255 the car came with and put the rest of the engine back together. I went to start the car with no luck. After beating my head against the wall for awhile I decided to pull the injectors out and found out they were extremely nasty and weren't firing. The car also came with new 60 lb injectors and turbo tweak chips to go with it for 93 octane and E85. I was going to wait to put them in until I got the car running but since I was having issues with the stock stuff I put the bigger ones in and the 93 chip. After getting everything back together the car fired right up and ran pretty decent with all things consider.
I did some driving around the block afterwards for awhile and ran into an overheating condition. The car got to 230 degrees when I finally got it parked back home. I popped the radiator cap and the engine had some pretty bad corrosion which ended up plugging the radiator. i put the original radiator back in which leaked from the wreck but took care of the overheating problem. I ordered a gn1 aluminum radiator which I was extremely pleased with the quality.
While I was waiting on the radiator to show up my dad and I decided to realign the body panels since the new ones were just tossed on after the wreck. I also switch the heater box out with a grand national one since someone had put a stock regal one in by mistake.
After getting the car back together with the new radiator I was finally ready to take it for a real test drive. I took it down the street for fuel and threw about a half tank in it. Almost instantly afterwards the car started back firing and breaking up with any throttle at all. The scan master drops to around 500 milli 02 volts when this happens so it seems to have a lean condition.
I was told this is a sign of the factory maf having problems. I ordered a ls1 maf and a maf translator which didn't change the symptoms at all. After that I threw a decent amount of money in it and replaced the ignition module, coil pack, plug wires and plugs. This also didn't change anything. This was last November and it was getting cold here in Iowa. I decided to throw in the towel for the winter. Now that its spring I'm starting to take a look at it again hoping I can get it fixed.
The only other thing I found is two wires that were disconnected on the back of the passenger head. One wire is while the other is black with a while spring. I intially assumed these were engine groups and grounded them to the intake manifold bolt which doesn't seem to of changed anything. Can someone confirm if this is an engine ground, if the intake manifold bolt to the head is a decent spot and could I of hurt the engine letter it run without these grounds?
Any help would be greatly appreciated!
Thanks,
Matt