No Power Poor Acceleration

[kclm9803]

My 92 LS starts up and runs smooth and idles perfectly, but it has no acceleration power and wont go much over 70 MPH. No check engine lite or obvious malfunctions under the hood. I heard weak battery can affect performance so tried a new one and no improvement. I also checked exhaust flow and all good there. HELP!

KC

[RotaryAE86]

My 92 LS starts up and runs smooth and idles perfectly, but it has no acceleration power and wont go much over 70 MPH. No check engine lite or obvious malfunctions under the hood. I heard weak battery can affect performance so tried a new one and no improvement. I also checked exhaust flow and all good there. HELP!

KC

a couple things come to mind. air filter, fuel filter, injector cleaner and maybe fuel pressure regulator. those are the items i would look into first

[kclm9803]

My 92 LS starts up and runs smooth and idles perfectly, but it has no acceleration power and wont go much over 70 MPH. No check engine lite or obvious malfunctions under the hood. I heard weak battery can affect performance so tried a new one and no improvement. I also checked exhaust flow and all good there. HELP!

KC

a couple things come to mind. air filter, fuel filter, injector cleaner and maybe fuel pressure regulator. those are the items i would look into first

thanks for the reply, New air filter, this is an all of the sudden malfunction so doubt it falls into a normal service issue. I like the sugestion of FPR I'll check that but I fear something more evil (and expensive)

[wwest]

My 92 LS starts up and runs smooth and idles perfectly, but it has no acceleration power and wont go much over 70 MPH. No check engine lite or obvious malfunctions under the hood. I heard weak battery can affect performance so tried a new one and no improvement. I also checked exhaust flow and all good there. HELP!

KC

Not really "tongue in cheek", but how did you check exhaust flow with the engine under a 70MPH load factor.

You most likely have a partially blocked exhaust due to a crumbling catalytic converter, not an unusual event for one this old.

Drive it at 70 for a few minutes at night and then look to see which parts of the exhaust are glowing CHERRY RED from HEAT.

I don't think the firmware for models this early was sophisticated enough to detect this.