300M, Concorde, LHS, New Yorker Discuss the Chrysler LH platform cars within.

1996 Chrysler LHS - Idle Problem - Please Help

  #1  
Old 02-27-2017, 01:08 PM
Junior Member
Thread Starter
Join Date: Feb 2017
Posts: 4
Default 1996 Chrysler LHS - Idle Problem - Please Help

Hey everyone,

I'm brand new to the Chrysler Forum, and this is my first post. Hopefully, this will help other LHS owners as well. Here's my story...

A few years ago, my uncle sold me his 1996 Chrysler LHS 3.5L V6 for $600. At the time, it had 150k miles on it and was always garage kept, never driven hard, and always taken to a dealer for any maintenance. Right before I bought it, my uncle had put almost $2,000 of work into it to replace all of the motor mounts and fix up the undercarriage.

Last year, it started to give me a lot of issues. The car would shut off while driving. I determined that the crankshaft position sensor was the issue, replaced it, and the problem went away. At the time, the car also had a random overheating issue. I found out that the head gasket had blown and treated the coolant system with head gasket stop leak. During all of this, we had to replace all of the hoses, radiator, water pump, thermostat, and timing belt. There have also been issues with the fuel pump, fuel injectors, and coil pack. Since then, the overheating issue had stopped.

Since last year, there has been an idling issue that we can't seem to figure out. I know it's not the best option, but I've been throwing some money at it with no results to fix the issue. Right now, the car had almost 180k miles on it, and I drive it back and forth on a two-hour drive once a week with no problems. The only issues I'm having right now are when the A/C kicks on (in park, at idle, or at a stop light) RPM's will drop from 1500 down to 600-700 and then fluctuate. Another issue is that the car will "shimmy" to a stop. It feels like you're driving a manual and stalling it out a little if you don't hit the clutch just right. Also when you're in idle or at a stop light (even with the A/C off), it will shake and rock you back a forth a good bit. It runs fine when you're driving it on the highway, it just has issues as lower RPM's.

I've checked for vacuum leaks, cleaned the fuel injectors with sea foam, cleaned the intake with sea foam spray. Throttle body has been cleaned (without taking it apart). All injectors seem to be working properly. Fuel pressure is normal. Compression is good.

One thing that might help, when I first start it in the morning, it starts right up. After that, it takes awhile to start. Maybe 3 or 4 seconds, but it's only when the engine warms up a little.

Some people said that it might be a Camshaft sensor starting to go bad?

Previous Engine Codes: P0320, P0340, P1282, P1599, P1598, and P0645 (all of these are fixed now)

Current Engine Codes: P0300 (Multiple Random Misfire), P0302 (Cylinder 2 Misfire), and P0306 (Cylinder 6 Misfire). Sometimes when I'm driving the check engine light will blink continuously and then stop, it's completely random.

Here's a list of the parts that I've replaced on the car:
Spark Plugs
Wires
Coil Pack
All 6 fuel injectors
Fuel Pressure Regulator
Fuel Pump
Idle Air Control
EGR Valve
Thermostat
Radiator
Hoses
Water Pump
Timing Belt
A/C Compressor
Expansion Valve
Condensor
Dryer
Crankshaft Position Sensor
Battery
Intake gasket
All new belts

Your help would be greatly appreciated.
 
  #2  
Old 03-03-2017, 09:52 AM
dcotter0579's Avatar
Senior Member
Join Date: May 2008
Location: Detroit suburb
Posts: 4,993
Default

The only issues I'm having right now are when the A/C kicks on (in park, at idle, or at a stop light) RPM's will drop from 1500 down to 600-700 and then fluctuate. Another issue is that the car will "shimmy" to a stop. It feels like you're driving a manual and stalling it out a little if you don't hit the clutch just right.

600-700 is the correct idle speed. 1500 is way too fast for an idle speed. You might want to check the idle air control motor. The engine computer directs the IAC motor to open or close as necessary to maintain idle speed.

The jerking to a stop problem sounds like the torque converter lock-up is sticking. When was the last time the trans fluid was changed? Another thing you could consider is replacing the solenoid pack on the transmission. It's not very expensive and fairly easy to do. Google it for more information.

You're getting misfires on cylinder 2 and 6. Check your coil pack to see if the same coil feeds those two cylinders. A coil pack will have three coils, each coil drives the plugs of two cylinders. Also make sure the wires for those cylinders aren't touching each other or something they shouldn't.

Hope it helps.
 
  #3  
Old 03-04-2017, 01:21 PM
Junior Member
Thread Starter
Join Date: Feb 2017
Posts: 4
Default

Originally Posted by dcotter0579 View Post
The only issues I'm having right now are when the A/C kicks on (in park, at idle, or at a stop light) RPM's will drop from 1500 down to 600-700 and then fluctuate. Another issue is that the car will "shimmy" to a stop. It feels like you're driving a manual and stalling it out a little if you don't hit the clutch just right.

600-700 is the correct idle speed. 1500 is way too fast for an idle speed. You might want to check the idle air control motor. The engine computer directs the IAC motor to open or close as necessary to maintain idle speed.

The jerking to a stop problem sounds like the torque converter lock-up is sticking. When was the last time the trans fluid was changed? Another thing you could consider is replacing the solenoid pack on the transmission. It's not very expensive and fairly easy to do. Google it for more information.

You're getting misfires on cylinder 2 and 6. Check your coil pack to see if the same coil feeds those two cylinders. A coil pack will have three coils, each coil drives the plugs of two cylinders. Also make sure the wires for those cylinders aren't touching each other or something they shouldn't.

Hope it helps.
I appriceate the help. I'll check it out this week and let you know what I find.
 
  #4  
Old 03-04-2017, 06:41 PM
Junior Member
Thread Starter
Join Date: Feb 2017
Posts: 4
Default

Originally Posted by dcotter0579 View Post
The only issues I'm having right now are when the A/C kicks on (in park, at idle, or at a stop light) RPM's will drop from 1500 down to 600-700 and then fluctuate. Another issue is that the car will "shimmy" to a stop. It feels like you're driving a manual and stalling it out a little if you don't hit the clutch just right.

600-700 is the correct idle speed. 1500 is way too fast for an idle speed. You might want to check the idle air control motor. The engine computer directs the IAC motor to open or close as necessary to maintain idle speed.

The jerking to a stop problem sounds like the torque converter lock-up is sticking. When was the last time the trans fluid was changed? Another thing you could consider is replacing the solenoid pack on the transmission. It's not very expensive and fairly easy to do. Google it for more information.

You're getting misfires on cylinder 2 and 6. Check your coil pack to see if the same coil feeds those two cylinders. A coil pack will have three coils, each coil drives the plugs of two cylinders. Also make sure the wires for those cylinders aren't touching each other or something they shouldn't.

Hope it helps.
My guess is that the transmission fluid has rarely been changed. Since I bought it, it's never been changed out for fresh fluid, but it was probably done when it went to a dealer.
 
  #5  
Old 03-10-2017, 10:52 AM
Junior Member
Thread Starter
Join Date: Feb 2017
Posts: 4
Default

Just an update, I checked the coil pack and wires. Everything seems to be good. I went out and purchased new OEM copper spark plugs, pulled the old ones and found wet oil on cylinders 3 and 6. The rest are straight black. Right after replacing the plugs, I took it out for a 20-mile drive with multiple stops and starts and no hard starts.

Also, the transmission solenoid seems to be what's causing the shaking issue. Whenever I'm sitting somewhere, and it starts shaking, I can put it in neutral, and the shaking will go away.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Driveway Al
Cirrus & Breeze
3
10-18-2011 12:22 PM
boosted5speed
300M, Concorde, LHS, New Yorker
0
07-23-2009 10:23 PM
daz911
Chrysler Voyager & Town & Country
0
01-15-2008 11:45 AM
daz911
New Member Area
0
01-15-2008 11:43 AM
ls.vtec_killa
300M, Concorde, LHS, New Yorker
1
07-02-2006 03:34 PM


Thread Tools
Search this Thread
Quick Reply: 1996 Chrysler LHS - Idle Problem - Please Help


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.