[soulnomad]

I have a 92 S10 Blazer w/ 4.3 that won't go over 2500 RPMs. it runs great, but while driving and stomp on it, it will get to 2500 and then almost act like it's running out of fuel. It sputters a little until I let off of it, and then runs fine just below 2500RPMs. On occasion it will run fine and get well above the 2500 and when I’m in park or neutral. Does anyone have an idea of why this is happening? I would like to do some work to this truck but I need to fix this problem first.

 

[4wdaaron]

egr valve?

 

[doh]

Catalitic Converter plugged

 

[nicolet]

Catalitic Converter plugged

I would agree...

Disconnect the exhaust, then try...

 

[GM Tech Mike]

Catalitic Converter plugged

Exactly what I first though. You can also disconnect the pre converter O2 sensors and see if it changes anything. Or the exhaust like Sonoma says, which ever is easier for you.

 

[member12]

Take the converter off, you don't need them anyways unless they check emissions in your state.

Some are a bitch to take off, though.

 

[FAB454]

Check fuel PSI should be 55-61

 

[Slideways]

Are CAFE regulations retroactive? Maybe Al Gore put a rev-limiter on your truck?

Hope you get it sorted out soon.

 

[91 s-10baja]

get a new tach.

 

[nicolet]

Please keep comments in the tech forum to the issue @ hand...

thanks

 

[bouda]

Fuel filter?

 

[GMCdriver]

We had a small rad hose leak that happened to squirt a small amount of coolant right on top of two spark plugs whenever the engine was warmed up a bit. It would cause the engine to miss and sputter, loose power and fail to rev up.
It was such a small leak that it took three trips to the shop to figure out what was causing the problem. It kept comming back "No Fault Found/Unable to Duplicate Concern" because the vehicle would cool off waiting for the tech and then act fine while he was examining it. They wanted to replace the cat but wouldn't guarantee that it would fix the problem so we held off and kept comming back untill they found the actual cause.