What to do if your Chevy 454 Idles low?

What to do if your Chevy 454 Idles low?

Check to see if the EGR valve is stuck open a little. If it is unable of running below 800 RPM test the fuel pressure, especially if the idle sounds weak and unstable. Is that 800 RPM, in park, or in drive?

How to solve idle problem in Chevy TBI 454?

1) Disconnect battery for at least ten seconds. (With the Key OFF) 2) Reconnect the battery. 3) Start engine letting it run for five seconds. 4) Turn key off for ten seconds. 5) Then start it and see how it idles. Did you give the model, year, engine, fuel system type, and transmission information?

Can a bad throttle position sensor cause idle surging?

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light

What’s the fuel pressure on a 1994 Chevy 350?

The ’94 350 has a much lower fuel pressure spec (9~13) than the ’94 big block (26~32), the fuel pumps are different parts. Did you install the complete engine including the TBI unit?

What kind of idle does a Chevy 454 have?

Remember me. I forgot my password! Can’t get my 454’s idle below 800 rpm, during warm-up it will run at 1100-1200rpm then drop down to 800. At speed it runs fine, but when droping down in rpm it is very delayed in getting to 800rpm. The engine is the origional stock ’94, 454 in a 4WD Suburban. Any suggestions on where to start trouble shooting?

What causes idle problems in a 1994 TBI 454?

At speed it runs fine, but when droping down in rpm it is very delayed in getting to 800rpm. The engine is the origional stock ’94, 454 in a 4WD Suburban. Any suggestions on where to start trouble shooting? Thanks, mike Never getting down to proper idle is likely a vacuum leak.

The ’94 350 has a much lower fuel pressure spec (9~13) than the ’94 big block (26~32), the fuel pumps are different parts. Did you install the complete engine including the TBI unit?

How can I tell if my idle control valve is working?

To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.