Q: New IAC Valve - High Idling but old IAC Valve normal (800/900 rpms) 1993 Saab

asked by on February 28, 2017

Good Day,

2 Questions please

  1. I replaced my IAC valve with a new one purchased online. However, the new IAC valve idles at 2000 - 2100 and even when it comes down it comes down much later in the day and still seems high at 1100.

But the old IAC valve starts high and comes down to around 800 - 900 rpms. This one seems fine. -------There doesn't seem to be a vacuum like anywhere.

Should I just leave the old one or have I found more problems with the car?

  1. If I have a fuel pressure regulator problem - would the "ENGINE" light come on?

additional info--Car takes 3 - 4 tries before it starts, which is why I tried putting a new IAC valve. I just installed a new MAF sensor. Still cranks after 4 tries when it's cold.. I think it's the FPR.

Thx a bunch... Shafi
My car has an automatic transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Where is the auxiliary jack located?
Your audio system is pretty advanced, even if your car doesn’t have the multi-information display. It’s capable of playing music from another source – all you have to do is connect the other device with a cable to the auxiliary...
Oil pan gasket leak
From the provided description, it sounds like your Nissan Rogue is experiencing a few different concerns. Let us address the concern with the oil leak first. If you are 100% sure that the oil pan is leaking, it is best...
Car cutting off while driving
This could be a fuel delivery issue, but it is hard to say exactly. Your vehicle has a complex engine control system that can self diagnose issues most of the time. Start by having the computer read and see if...
I lost a rear set of tires for excessive camber in the rear end. I have since replaced rear brakes and both stabilizer broke
They may cause some sag in the rear suspension but if you word the inside of tires, then you have worn bushings on the lower control arms and possible weak springs and struts. Have the entire suspension inspected and have...
Hearing a knocking/popping sound somewhere in the front of the car when driving.
There could be multiple issues causing the mystery sound you're hearing on your 2005 Mazda. My first inclination would be to check the steering stabilizer bar bushings (https://www.yourmechanic.com/services/stabilizer-bar-bushings-replacement), but if those were replaced, it could be an issue with your...
car pulls to right after being hit hard on left tire and slight dent on wheel well.
There was probably at least some damage to your tie rods. These are the connections between the steering rack and the wheel. If one is bent or fatigued, it could even be dangerous to drive the car. There are some...
Car started shaking
Shaking or vibrating may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. This creates a loss of power that resonates throughout the motor additionally causing other problems with ignition and fuel timing....
How much would it cost do do a top end motor rebuild on my 1991 acura integra
Hi there. Unfortunately, this is a service that our mobile mechanics are not able to perform. In general however, this type of service ranges from $1,250 to $2,000 based on the location, parts used and damaged to the cylinder head....
Just had my transmission oil leak fixed and now my car is acting up, when I'm slowing down it starts to like stall n then it stops
Hi there. Typically a slipping transmission will not cause the engine to vibrate and shake while the vehicle is in gear and nearly stalling when you stop. This is typically caused by a fuel system component failure, such as a...

Related articles

How Long Does a Throttle Position Sensor Last?
The The throttle body in your car is a rather involved system that is part of its air intake system. The air intake system is responsible for controlling the amount of air that you are letting into the engine. In...
Saab Certified Pre-Owned (CPO) Car Program
Many Many drivers who are in the market for a used Saab vehicle want to consider a Certified Pre-Owned, or CPO, vehicle. CPO programs allow owners of used cars to drive with confidence, knowing that their vehicle has been inspected...
How to Replace a Fuel Pressure Regulator
Fuel pressure regulators helps the fuel injector let out the right amount of fuel and maintains constant fuel pressure for optimal fuel usage.