I’m hoping someone out there can assist. My son has been a car fanatic for years and works hard to support his passion. I’m praying there’s someone out there who can figure this out because no mechanic has been able to. A while ago, he bought a 1985 Buick Regal – Engine 1987 Grand National (GNX) 60 Trim turbo. It runs meth injection and Scanmaster programming. It has a heavy duty timing chain, professionally built.
Please read everything he and the mechanics have already attempted. From the bottom of my heart, I would appreciate anyone who can help him out! He’s so frustrated at this point and is forced (gasp) to drive around in his mother’s minivan while his Buick remains in the bay.
Problem: Car wasn’t originally revving past 3000 and now it won’t even fire up.
Tried: Every fuse, clean gas & fuel filter, every wire (no breaks), checked sparks (spark all around), new coil pack, new 02 sensor, new cam sensor, new crank sensor, new computer, cleaned out map sensor. Compression Test : Has 190 lbs.
Fuel: 60 lb injectors and runs right off idle (60 lbs all the way through)
Voltage & Fuel Pump are fine.
Been timed multiple times.
Not the engine because when it was running, it ran very smooth and had no issues, but it wouldn’t run past 3000. Wasn’t the turbo because the turbo doesn’t spool up before 3500.
Engine has been rebuilt.
Emissions have been taken care of.
Can’t get a code off the computer (doesn’t have any).
Checked readings on all wires with volt meter and all is fine. Scanmaster is fine.
Pulled apart the Cam sensor and made sure it wasn’t missing any teeth.
Not the throttle position sensor because it would fire up even with a bad throttle sensor.
New plugs and wires.
Car was built by Cotton Performance.