Rpm low

It may have lost it is idle memory when the battery was disconnected. This sometimes happens with computer cars.

(We are guessing it all went back together correctly-if not, this below is not the answer!)

Eventually it will relearn on its own,

You may be able to make it 'learn' faster.

I am more into older vehicles and the computer stuff just is not my thing!

There maybe a better way than this, if you do some searching, At the top of our page, in the search box, install "Idle Relearn" that may help or the owner's manual, or the WEB.

The method I was taught to use is:

Find a sort of level stretch of road, that is sparsely traveled

We do not want a car on our butt while doing this!

Get your baby up to 60-65 MPH

Remove your feet from all of the pedals! (leave it in gear)

Let it coast down to nothingness (until you have to finally keep it from stalling)

That is it!

(see why you do not want company behind you?)

Did the clutch feller observe the situation? If this is not helping, maybe he can recheck his work, electrical connections/ vacuum connections he may have disconnected or accidentally pulled loose.

The Medic

Hi CJ. You're right, but it's much easier. Drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. The Engine Computer is waiting to see a steady voltage reading from the throttle position sensor, and that the throttle is fully-released. It knows the throttle is released by the higher-than-normal vacuum during coasting. The steady TPS reading only occurs when your foot isn't bouncing on the accelerator pedal.

Once the TPS reading is memorized, the computer will be in control of idle speed any time it sees that voltage again. If you replace the throttle position sensor, there's a 50 percent chance the new minimum reading will be slightly lower, since no two sensors ever read exactly alike. It will immediately put that new voltage in memory, then wait to see that to know it should control idle speed. If the new sensor's minimum voltage is higher, idle speed could be low or erratic until the coasting procedure is done again.

hi i have a bad idle on a dodge neon sxt it idles bad in drive at stop light but runs good when driving. i have had new plugs and wires on it and oil chang but it still runs bad i have been leaving ac on so it wont idle rough but now it is bad all the time . no check engine light at all and car has 68000 miles on it

Check the idle air control motor. It sounds like that could be the problem. Also, check for vacuum leaks.

If it has died on you at stop lights it could also be a collapsed cat.

Yes, the catalytic converter can cause this problem, but usually there is a loss of power along with it.

How do I adjust the idle on the engine. Idle is too low

Idle speed not adjustable controlled by PCM via Idle speed controller located on throttle body. Try removing and cleaning the throttle bore and IAC

https://www.2carpros.com/articles/throttle-actuator-service

Please run down this guide and report back.

Guys,
Thank you very much for the fast reply. Thanks to your reply, I know exactly what I need to do to fix my problem. I appreciate your input.
Sincerely,
Marc Frank

I recently picked-up a 2002 dodge neon with 108000 miles. The car runs great except for one problem. When the cars engine is warmed up the idle seams to low. It vibrates bad through the stearing wheel & dash. It does it weather im in park or drive. It does go to high idle when cold with no vibration problems.I recently replaced the Air filter,spark plugs,PCV, timing belt,water pump & torque strut's. Motor mount's were in good shape.

Clean out your throttle body, EGR and IAC module. if that does not seem to solve it, turn the idle up a bit about 100 rpms should do it.

Needs the mount at the front of the engine.Those cars vibrate alot, front mount takes most of the abuse

[quote:ab6c4dcd89="2CarPro Jack"]Needs the mount at the front of the engine.Those cars vibrate alot, front mount takes most of the abuse[/quote:ab6c4dcd89] Front mount was in good shape. No cracked rubber. Cleaned throttle body. Could not find EGR. Idle is better now. The only time it get's bad is when the AC compressor kick's in to AC or defrost. Almost wants to stall motor. leaning towards IAC.

Might help. Odds are the PCM is adjusting the idle right where it wants it.