Why would a vacuum leak affect the way an engine idles?
If there is a vacuum leak anywhere between the engine and the mass air flow sensor, it causes “unmetered” air to enter the system. This causes the actual air flow to be higher than the mass air flow sensor measures. The effect of a vacuum leak is more noticeable at idle, when the air flow is lower.
Can power steering affect idle?
Along with slowing down, the engine may stall when the wheel is turned. Again, this is due to the computer not being able to meet the changing demands of the power steering system, causing the engine idle to drop too low.
What causes hard steering at idle?
Cause: The power steering pump is not providing sufficient pressure to operate the power steering rack/box correctly at engine idle revs. Most power steering pumps create pressure by forcing the power steering fluid into smaller space using rotating vanes or cylinders.
What will happen if you overfill power steering fluid?
In rare instances, overfilling power steering fluid can cause a fire in your engine. Most modern power steering systems will have a way for excess pressure to leave. When the power steering fluid releases and distributes itself over the engine’s parts, it can cause a fire. This usually requires a fairly large spill.
What’s the procedure for power steering vacuum bleeding?
POWER STEERING SYSTEM VACUUM BLEEDING PROCEDURE. 1. Verify that hoses are routed properly. Contact with the frame or engine may cause system noises. 2.Verify all hose connections are tight. 3. Remove the pump reservoir cap. 4. Fill the reservoir to the FULL COLD level. 5.
What to do if your steering hard at idle?
If you need some help with all of this, a certified technician from YourMechanic can come to your car’s location to inspect the hard steering issue and follow through with repairs. The statements expressed above are only for informational purposes and should be independently verified.
Where is the diagnostic box on a 1987 EFI truck?
1985-1986 (and some 1987‘s) EFI trucks do not have this box, you’ll find the spot to jump it at the DRIVERS side fenderwell. It is the connector that has 2 wires (not 1, not 3 or 4, just 2).
How does idle control work on a GM TBI?
The IAC (Idle Air Control) valve utilizes the on-board computer to fine tune the idle speed according to engine conditions. Remove the wing nut on top of the air cleaner and lift the air cleaner off the throttle body to access the vacuum lines. These are attached to the bottom of the air cleaner.