1975 Datsun 280z Acceleration under load

1975 DATSUN 280Z
81,000 MILES • 2.8L • 6 CYL • RWD • AUTOMATIC
Avatar
SLASHER
  • MEMBER
  • 2 POSTS
I have checked fuel pressure, replaced injectors, checked for bad wire grounds, replaced water temp sending unit at front of engine. Car still won't run out in gear. Runs out @ 6000+ Rpm in park or neutral.Is this possibly related to exhaust gas pressure?
Sep 8, 2014 at 4:47 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
I'm not sure I understand. What do you mean it runs out at 6K RPM's in park or neutral? As far as the exhaust, is there a catalytic converter on it?
Sep 8, 2014 at 5:01 AM
Avatar
SLASHER
  • MEMBER
  • 2 POSTS
The engine will run up in rpm in park or neutral, but when in gear and you try to accel it falls on its face, chokes, sometimes backfires. It has a cat. Thanx, Ken
Sep 10, 2014 at 12:54 PM
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
You could check back pressure to see if the converter is plugging. Also, often times, they will get red hot if they are plugged. Other than that, you should check ignition timing as well as the ignition advance.
Sep 10, 2014 at 5:21 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.