Reving And Slowly Goes Back To Idle

[85 mustang lx]

When I rev my engine it very slowly goes back to idle. Is this common or is something wrong?

Butch

 

[jrichker]

No info about if your car is EFI or carb, no mods listed. Makes it hard to troubleshoot when we don't know what you have.

That's why it is a good idea to use the sig under the user control panel (User CP) option. It allows you to post your car year & mods, which help greatly when troubleshooting things. No, it is not there for us to snoop and see any "Secrets" you have hidden away under the hood. Be a good Stangnetter and update you sig for future reference & don't keep us guessing.

 

[85 mustang lx]

It is an auto, mass air conversion SEFI

 

[jrichker]

It is an auto, mass air conversion SEFI

Thank you, that was a very important piece of information that I didn't have.

You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix.

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 134,000 hits, which indicates it does help fix idle problems quickly and inexpensively.

 

[madspeed]

agreed, foloow jrickters advice!

 

[85 mustang lx]

My car idles perfect no surging it is just when I rev the engine it takes a few seconds to come back to idle not like the cars I owned with carbs that would drop to idle right away.

 

[jrichker]

My car idles perfect no surging it is just when I rev the engine it takes a few seconds to come back to idle not like the cars I owned with carbs that would drop to idle right away.

The auto trans cars have a "dashpot" section of the computer program which helps prevent stalling when slowing to a stop.

If the car is doing this when you are in Neutral or Park, see the Surging Idle Checklist sticky. There is a section in it on cleaning the IAC/IAB and setting the base idle.