When put into gear the engine start idling rough
Could be a bad instrument panel(IP). Rough idle in gear could be a vacuum leak. Maybe a tune up.
SOURCE: Rough idle at start up
My 1997 lesabre has developed the same problem. I replaced plugs,wires,pcv valve and O2 sensor to no avail. Also tried several tanks of high octane. Yesterday I left the store and it wouldn't start at all. Had the car towed to a good local shop. Today they said it starts fine and has been all day! They checked everything they could think of and can find nothing wrong. The head mechanic suspects the crank sensor but said it should give a check engine lite if it was having a problem. Of course the third time I started it after picking it up the damn thing barely ran for a minute or so before finally smoothing out. No check eng lite. This is becoming very frustrating!
SOURCE: Engine backfires when accelerating
Idle is rough because not a right Air/ Gas mixture.
The ideal air /gas ratio is 14.6:1. If less than that it has rich mixture. If it more then that it has a lean mixture.
Back fire happens when accelerated because of of rich mixture pumped out at exhaust cycle is burning.
At speed above 40 miles/hour, temperature and fast compression cycle make the problem is less obvious.
Cheap first shot is to replace the air filter to correct this ratio. If it doesn't help, need Fuel distributor service. ( However people like to make easy money from you first, they will convince you for a turn up) Good Luck. I'll check back to see how the progress going.
SOURCE: rough idle on 2008 chrysler towne and country
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem. The
engine and the automatic transmission (transmission control is
only for automatics, engine is still computer controlled no matter
the transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM or ECM,ECU), which is very rarely the
problem. Other basic checks must be done as well such as mechanical
problems with the engine as well as engine state of tune and mileage
on the engine. The transmission can have mechanical issues as well
such as no gear engagement at all or a failed pump or other pressure
related problems. Also engine mechanical problems can and do cause
many drive-ability related problem such as rough idle and other
symptoms.
SOURCE: 2003 Chrysler Town & Country has an
For anyone doing a search on the same symptoms, this is also very indicative of a lean condition on this vehicle. While not enough to pop a code, 10% long term fuel trim will cause these same sysmptoms...troubleshooting the lean condition is an entirely new topic.
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