1996 Chrysler Concorde

Possibly just clean the throttle body. Loose gas cap could have made the light go on. Disconnect battery and see if it resets and stays off. Otherwise take it somewhere that will read the codes for you.

I was going to suggest cleaning the TB too. I did my '99 a couple of weeks ago, and it straightened out a rough idle. Haven't run enough tanks thru to be sure, but it appears the mileage has gone up a couple of mpg too.

Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x')

Just to be clear, there are TWO Throttle Bodies on the '96 3.5L. Make sure you clean both thoroughly and then do a power reset by removing the battery cable for a minute or two when you are done. You also don't say when the vehicle was last tuned. At it's age, regardless of mileage (my '96 Vision TSI has about 70K and I have replaced the plugs twice and the wires about two years ago ), the spark plug wires should also be replaced assuming they have not been to date. I agree on replacing the air filter, fuel filter, and the PCV (not on your list) as well.

Lastly, as preventive maintenance, the transmission pan should have been dropped/cleaned, the magnet removed/cleaned, filter replaced and then refilled with ATF+4 at least twice by now. I only mention this in case you want to suggest this to the owner keep it running well Chrysler transmissions of that vintage are noted for having problems if they are not properly maintained. Make sure they drop the pan and replace the filter and don't just do a power back flush (which supposedly gets all the fluid, but leaves the dirty filter, used clutch material, and debris in the pan.

Good luck. I suspect the rough idle is from dirty TBs and possibly a plugged air filter. Assuming much of this maintenance is due anyway, I'd go ahead and do it first to see if it solves the problem. If not, then take the advice and get the error code read. It could be an O2 sensor or the EGR as well.

Bob

By the way, if you get a bang under the AT console when parking or turning, it is probably the rear AT mount and not engine mounts.

Could be a vacuum leak. Places to look first are the power brake booster (disconnect and plug the vacuum line to see if it smooths out the idle), PCV valve, and if it comes to it all the smaller vacuum lines.

Also could be a bad EGR valve (this would actually be my first guess).

DudLee Brennfoerder wrote:

Yep..... forgot that one because most people are driving 2nd generation LH these days.

Thank you all very much: I plan to scan the codes: then change the air filter clean the intake(s) replace the fuel filter change the air filter change the PCV valve and then 02 sensors

Good point- I tend to forget that one because my wife's car never did that in 215,000 miles. I did replace the lower intake gaskets at

Thank you all!

-- Car came in with a p0301 code- mis-fire in cyl #1; and plug is burnt...-- reset codes, replaced plug, cleaned intakes with seafoam, and treated engine and fuel with Seafoam also; running now, with no codes, and idles smoothly;

ok, changed fuel filter, plug #1, air filter, checked all fluids, engine still idles rough, touch the accel. and she smooths right out. Spraying a little starting fluid around the front of the intake manifold changes the idle speed instantly. have cod p301 #1 cylinder misfire again- intake gasket?

ok, changed fuel filter, plug #1, air filter, checked all fluids, engine still idles rough, touch the accel. and she smooths right out. Spraying a little starting fluid around the front of the intake manifold changes the idle speed instantly. have cod p301 #1 cylinder misfire again- intake gasket?

both upper and lower intake gaskets are leaking -- both brittle and hard. ordered the thermo gasket, the egr tube gaskets, the fuel rail gaskets, plugs, and wires; since we are here.... hardest part is getting the old gasket off....

-- my 98 Ram 5.9l intake is leaking-- suppose you guys can talk me into going it...?