What should the idle RPM be on a Chevy 454 Eng?
You want the idle to be around 800 to 900 rpm with the vehicle in park and around 700 rpm with the vehicle in neutral. Monitor your tachometer while adjusting. Adjust the idle by sound if you do not have a tachometer. Listen for the engine rpm to drop until just before it starts to sputter.
What kind of gas mileage does a 454 TBI get?
GAS MILEAGE. Always a big complaint with 454 TBI trucks. 90 and older is particularly bad and that is largely due to NO OVERDRIVE. Nothing is going to help that fuel mileage more than overdrive.
How to add more power to a Chevy 454?
The old cast-iron cylinder heads and low-rise intake manifold were dumped in favor of some aluminum PowerOval 280 heads from Trick-Flow with upgraded valvetrain and a Summit single-plane intake manifold. The old camshaft came out, too, with a meatier hydraulic bump stick with 0.600 inches of lift taking its place.
What kind of gas mileage does a Chevy 454 get?
The 454 is a big-block carbureted engine found in most older model Chevrolet cars and trucks. The engine uses eight cylinders to provide high-end torque and speeds. The combination of larger bore and eight cylinders equates to very poor gas mileage. The engine runs an average of 10 to 15 mpg.
What kind of fuel pump does a TBI 454 have?
Stock TBI 454 makes 230hp and 380tq so stock fuel pump is maxed out right off and a typical 454 will run better with a fuel pump upgrade even with stock chip. GAS MILEAGE. Always a big complaint with 454 TBI trucks. 90 and older is particularly bad and that is largely due to NO OVERDRIVE.
Is the Vortec 454 in a 97 Silverado 3500?
I have a 97 silverado 3500 with the vortec 454 in it. It has 200k on it, and has a horrible low throttle input miss and a high idle at times. It is also way down on power and stumbles until you really give it some gas, but even then, you can tell its low on power.
Is there a Vortec 454 fuel pressure regulator?
The vortec 454 does not have the same injectors as the small block vortec. It uses the same type injector LT1 and TPI engines. They are buried under the plenum. Do you have any signs of fuel in vacuum line to the regulator? Does the fuel pressure at idle seem steady?
What should I do if my GM TPS is not working?
Though this can happen to any car, many GM owners have reported such a failure. The TPS must be adjusted (rotated) so that it reads idle and full-throttle positions properly, or it may appear to be malfunctioning. Try adjusting the TPS before replacement to save a few dollars.