98 intrepid won;t idile runs fine if on throttle got code p1684 check engine light comes on right before it dies

If the check engine light comes on first, then the engine dies, check the computer for trouble codes.
If the engine dies first, normal for the check engine light to come on.
You will need to figure out if the engine is loosing spark or fuel or both.

P1684 is only a status which indicates that the PCM memory has been cleared within the last 50 ignition cycles and does not indicate a problem.
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Hi,
I just wanted to show you what I found on the internet regarding p1684:
"P1684 engine code

The P1684 code simply means that the battery has been disconneted within the last 50 starts."

there is a tps located on the intake where the inlet tube for air intake connects, it would be on the left side of the throttle body. does the trk run rough on idle? up/down sputter sometimes stall? Is check engine light on? if no light,check all vacuum lines for cracks/splits loose fit. do this by spraying carb choke cleaner on connections motor rpms will change if leak is present. also spray around perimeter of intake housing where mates with lower intake if engine revs you have bad intake gasket.I Just replaced upper and lower intake on my 98 and shazaam, runs like it should. but do your checks first,unessasary fixes are costly and **** you off.

p1684 just means the battery has been disconnected. Check the tightness of the battery terminals. make sure the terminals are free of corrosion..

When you say " wont start", are you saying the engine wont turn when turning the ignition key or the engine will turn over but not run?

the1684 is letting you know battery was recently disconnected. 0340 is camshaft position circut failure.

P1684 - Less than 50 Key On's.
P0302 - Misfire at Cylinder #2
P1493 - Ambient/Battery Temperature Sensor Input voltage too low.
Oil Light with the correct oil level = Oil Pressure/Sending Sensor.

If the Check Engine light comes on there is a problem.
1. Find a new mechanic!
2. After this Check Engine Light comes on there should be a Code or several Codes.
a. If so Turn the Key from off to the ON (not start) position THREE (3) times. On the THIRD (3rd) time leave the the Key in the ON (not start) position.
b. If you have an Digital Odometer, the Code(s) will appear there. "P" followed by four (4) numbers. Let it give you all the codes until it reads "P donE". Record these numbers.
c. If your do not have a Digital Odometer, the Check Engine Light will start Blinking. Carefully count the number of Blinks. Most are in two (2) or three (3) digit numbers. Again let the Light go thru all the "blinks", The Final blinks should be 5 blinks and 5 blinks.
Regarding your dying problem:
Lights dimming after it starts, could indicate that your alternator is failing. One easy way to check this is:
A. Start the car.
B. With the Engine running: Remove the negative (black side) wire from the Battery.
C. If the Engine dies the alternator is bad. The Battery "starts" the engine. The Alternator keeps the engine going.
Regarding your Gas Pedal:
(1) Check underneath the dash where your Gas Pedal it located. Check for wires or anything else that could be hindering the Pedal from going down.
(2) With a Partner pushing down on the Pedal (engine on or off) Check inside the Engine compartment to watch the Throttle Cables for movement or binding. Also (with a partner) Pull on the throttle cable or turn the throttle connection to see if the Throttle is capable of openiing fully. The partner should be looking under the pedal to see if it is also moving. Do not force (too hard) the throttle or cables. If the throttle itself is binding, it may need cleaning: Remove and check for dirt, grime and function (opening / closing all the way). You can use some penetrating oil on moving part to loosen these areas.

Let me know if this helped or if you have additional questions or information. Feel free to contact me on FixYa.com!

code P1684 is loss of battery in the last 50 starts check connections to batt and load check batt with load tester and cells with a hydrometer to see if any cells are dead most of this is free tests at your local parts store

I have a 98 dodge intrepid with a 2.7. My car would run fine at times and then all of a sudden start to miss badly and the valves would rattle. The mechanic changed the cam shaft sensor and now it runs very well.