66mustang93 said:My car currently idles around 600 to 700 RPMs. What should the idle be for my setup (see signature). It always feels like it wants to die when I come to a stop.
I have also read adjusting the fuel pressure and advancing the timing will help with this cam.
What should I try first?
ICantDo55 said:It seems that many people have trouble with the way their 5.0 Mustang idles. Symptoms are usually a stumbling or rough idle which may be the result of modifications, or any number of other factors that may contribute to the problem. Clogged Emissions Gas Recirculation (EGR) Valves or Idle Air Bypass (IAB) solenoids are often to blame. A bad Throttle Position Sensor (TPS) will cause the engine to “hunt” for a proper idle setting. If you are experiencing idle problems first check the IAB. If it has large amounts of carbon deposits in it you may need to clean it using regular carburetor cleaner. You will have to remove it to do this, DO NOT clean it while it is on the car! If you have checked to make sure that your EGR, IAB, and TPS are clean and properly set and you are still experiencing problems try the following:
1. Clear the EEC-IV’s idle memory by disconnecting the battery for 20+ minutes.
2. Disconnect the Idle air bypass solonoid
3. Reconnect battery
4. Start engine and set idle speed to desired RPM with stop screw on throttle body (900 rpm works great with E303 or larger cam)
5. Turn off engine and reconnect the air bypass solenoid*Optional — set TPS to 0.90 - 0.95 volts (Do not exceed 1.0 volts MAKE SURE!) Use a digital volt meter!
6. Start engine and let it idle for 2 minutes with no accessories on.
7. Turn off engine for two minutes
8. Start engine again and run for 2 minutes with every accessory turned on.
9. Turn engine off again. Your computer should have now re-learned the new idle settings. This procedure assumes that you have a clean IAB valve. If it is carboned up then you may need to remove it and clean it with carburetor cleaner.
TheUser said:I have an E303 in my GT in my sig. No surges, no hanging idle, no high idle, no dying at lights...perfect idle around 650-700 rpm. I used to have all of those problems, though. After verifying TPS settings and all of that, I bought the idle air adjuster at the local ford dealership for $35 and it lets you let some additional air past the throttle body without opening the butterfly and inreasing the idle. The adjuster was actually a recall item that ford put on Mustangs because it was cheaper to do than than to clean the IAC. My 1990 LX 5.0 has one of those on it from the recall.
It doesn't work for everyone, but it works for some. Worth the $35 in my book. I also stepped down from the 30's to the 24's when I built the enigne a few months ago. No more rich idle.
MAC'n89Blckstng said:DONT TOUCH THE IDLE SCREW!!!!!!! If you do this, you mess with the TPS readings, and then you run into problems that you cant really figure out. I messed with the screw when i first bought my car (i was 17) and now I cant get a good base reading from the TPS. Its all messed up which is why I think Im having bucking problems.
I have an E303 in my GT in my sig. No surges, no hanging idle, no high idle, no dying at lights...perfect idle around 650-700 rpm. I used to have all of those problems, though. After verifying TPS settings and all of that, I bought the idle air adjuster at the local ford dealership for $35 and it lets you let some additional air past the throttle body without opening the butterfly and inreasing the idle. The adjuster was actually a recall item that ford put on Mustangs because it was cheaper to do than than to clean the IAC. My 1990 LX 5.0 has one of those on it from the recall.
It doesn't work for everyone, but it works for some. Worth the $35 in my book. I also stepped down from the 30's to the 24's when I built the enigne a few months ago. No more rich idle.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?