96 Concorde check engine light

96 Concorde LXI 3.5 V6 Total mileage 101600, purchased from relative
3000 miles ago. Since that time has had maintenance including tune up
(plugs-plug wires-pcv, because I complained about slightly rough idle
which has improved).

About 1500 miles ago check engine light comes on, no noticeable problem
with performance. Took back to mechanic who did tune up. Says light on
because engine computer recorded "cylinder misfire". Clears code, pours
a "fuel system cleaner" in fuel tank and says will recheck at no charge
if light comes back on. Now light is back on. Car had sat idle-not
driven for previous five days. Still no noticeable problem with
performance, starts and runs fine, no other issues. Any suggestions on
what to check next? Thanks in advance.

 

More then likely the intake manifold gasket is blown out and causing a lean
misfire and setting the code. Is the misfire code a #3 0r 6 cyl?
Also with the car in gear at idle, do you notice a slight lobe or mis?

Glenn Beasley
Chrysler Tech

 

<More then likely the intake manifold gasket is blown out and causing a
lean
misfire and setting the code. Is the misfire code a #3 0r 6 cyl?
Also with the car in gear at idle, do you notice a slight lobe or mis?
I will have to ask which cylinder when I take it back and ask the
mechanic to check it again. I haven't noticed a slight lobe or mis, but
I also don't drive it regularly. Is this intake manifold gasket a
difficult/expensive fix?

 

sometimes a bolt can break off in the head and it gets costly then
does the cruise lite come on while driving even thiough u have it off????

 

<does the cruise lite come on while driving even thiough u have it
off????>

No...the cruise is operating normally. What would be the best course of
action? do an exploratory on the intake manifold or wait and see if
more serious symptoms appear?

 

Use an unlit propane torch, blow propane around the seams of the intake
manifold at idle, if idle speed changes (meaning the engine is sucking in
propane through the leak instead of air) then you have a leak there.

Ted

 

You may now have a different problem. There are many diagnostic codes.

I've had my '95 Concord since 6k miles, now at 80k miles.
The check engine light has been coming on at random times since I got it.
The diagnostic code is always "33" related to the air conditioner.
Dealer can't fix it, I'm having to ignore it.
My engine and air conditioner run perfectly. My problem is obviously
intermittent and not serious.

I suggest you check the diagnostic code when your light comes on.
To do so, with the engine off turn the ignition key on/off/on/off/on.
After a slight delay the engine light should flash the recent check
codes, in number pairs. I believe "55" is end of stored codes, I keep
the the code list in my car. After a number of starts the codes are
deleted.
The full maintenance manual gives the codes and their meaning.

 

let it ride just keep a eye on it

 

that trick won't work on a 3.5

 

the dealer can fix u just don't want to spend the money for a new evap. coil

 

Has for me, many times.

 

The car was back in the shop for an unrelated problem. Check engine
light back on, checked codes. New code is P1289 manifold tune valve ckt
open-short. when originally checked, code was P0306 which was not
present this time? Any thoughts?

GrtArtiste