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Chrysler LHS

1297 messages,  Last post on Nov 12, 2008 at 10:00 AM

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What is this discussion about? Chrysler LHS, Sedan


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#1288 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tsurnick] by tuscanskipper
Sep 29, 2008 (3:23 pm)
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Replying to: tsurnick (Sep 29, 2008 2:38 pm)

Have you checked the codes? Is there a problem with the idler motor or circuit? Unfortunately, I think you still have an intake leak. It should not idle at 1000 RPM when not in gear. It should be 750 to 800. It should drop back to around 700 to 750 in gear.
 
Did you get all your surfaces clean? Are you sure you have not had a gasket slip on reassembly? I think one of these two things is likely the issue. Try squirting carb cleaner in all ares of the replaced gaskets, and see if idle increases. I do believe your repair was not properly carried out most likely.
#1289 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tuscanskipper] by tsurnick
Oct 03, 2008 (6:16 pm)
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Replying to: tuscanskipper (Sep 29, 2008 3:23 pm)

the idle was more around what you said it should be. It idles around 850 normally. I have checked the gaskets and every other area that i did. I was on another website which i think it was Justananswer.com where you can chat with an actual mechanic. He had me try several things and the last thing he had me try was to take the big vacuum hose off that comes from the plenum to the Brake booster. He said pull it off at the plenum and cap it. he said sometimes the brake booster goes bad when the car is that old (94) and it leaks vaccuum. when it goes bad it takes away vacuum from the motor when you push on the brakes. when i did what he said and then put the car in gear and pushed on the brakes the idle stayed the same instead of dying or dropping idle. it worked. but one thing i hadnt done was let the motor warm up when i did that test. It seems that 1. the engine has to be warm 2. you push on the brakes for more than about 20 seconds like you are stopped at a long light. i was at starbucks getting a frappachino and it almost died in the line. I am puzzled. it runs fine when i am driving around and when i have it in park and neutral. I had a mechanic friend of mine check it out and he did find a vacuum hose that was bad and replaced it. it still has the same problem.
#1290 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tsurnick] by tuscanskipper
Oct 03, 2008 (10:06 pm)
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Replying to: tsurnick (Oct 03, 2008 6:16 pm)

Have you checked the idler solenoid codes? The idler bypass solenoid should stop this stall.
You can check codes from the ignition switch. Turn the switch on, off and then on fairly quickly, and count the flashes from the check engine light. A series of two sets of five flashes in a row, is 55. That should always be the only code, unless the battery was recently disconnected and you will get a one two flash, which is 12, and then fifty five. Any code flashed before 55 code is a fault code.
#1291 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tuscanskipper] by tuscanskipper
Oct 03, 2008 (10:15 pm)
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Replying to: tuscanskipper (Oct 03, 2008 10:06 pm)

One other thing. Did you resynchronize the throttle bodies after re installation?
#1292 of 1297
Chrysler LHS Over Heating Now by tsurnick
Oct 13, 2008 (1:24 pm)
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I just got everything else repaired and now the LHS started overheating today. One thing i dont like about this particular vehicle is the cooling system. it has one of those self contained radiators that doesnt have a cap on top of it. the overflow tank is near the firewall on the passenger side. I have recently replaced the thermostat. ( I had to take it off when I replaced the intake manifold gaskets). what should i check first on the cooling system. We actually changed the fluid about 3 months ago. What is a good way to tell if the radiator is clogged?
#1293 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tuscanskipper] by tsurnick
Oct 14, 2008 (6:17 pm)
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Replying to: tuscanskipper (Oct 03, 2008 10:15 pm)

Yes, I did Sync the throttle bodies. everything seems to have worked itself out. Please see my other post about the cooling system. Any info would be good
 
Thanks
 
Timothy
#1294 of 1297
Re: Mystery of the rough idle on the Chrysler 3.5 V5 solved! [tsurnick] by tuscanskipper
Oct 14, 2008 (10:11 pm)
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Replying to: tsurnick (Oct 14, 2008 6:17 pm)

First assume that the over heating is related to your repair until proved otherwise.
 
The first thing that comes to mind is air locks in the cooling system. When the radiator is drained AND filled the heater must be full on. If it wasn't then drain and start again. Also as it first warms up after filling, bleed off the air by opening the air release valve on top of the thermostat housing. Remember the heat must be switched full on with the engine running before draining, as it needs the electrics up and vacuum to set the heater full on.
 
Talking of the thermostat, make sure it is correctly oriented. It is eccentric, so make sure it not only is the right way round, but that none of the struts is impeding flow. Most modern thermostats are very sensitive to correct orientation.
 
The third and worst possibility is that you have leak of coolant into the manifold due to a gasket leak around a waterway on the intake manifold. Did you put a bead of blue RTV sealant around the waterways on the intake manifold, as specified in the repair manual? If you are leaking water and replacing it with air, then you should see a white sweet smelling exhaust, especially on first starting up.
Also a plug or two will show evidence of water present during combustion.
 
Those are my thoughts on things to check.
#1295 of 1297
chrysler lhs exhaust by jolley18
Oct 16, 2008 (12:04 pm)
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Is the original exhaust pipe spliced before or at the wye ?
#1296 of 1297
94 lhs no heat by nbelt
Nov 12, 2008 (8:08 am)
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so i got a working heater control and now it wont blow hot air?? im told that you have to take the entire dash out to access any of the components that could be causing this, i.e the actuator that opens and closes the door to allow hot air to come through. does anyone know if any of this stuff can be accessed without taking the dash out?
#1297 of 1297
Re: 94 lhs no heat [nbelt] by tuscanskipper
Nov 12, 2008 (10:00 am)
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Replying to: nbelt (Nov 12, 2008 8:08 am)

Your information is very sparse. What problems have you had, and why did you replace the ATC unit?
 
As you select modes does air blow from the correct locations?
 
Have you done any work on the cooling system, or drained it for any reason?
 
The heating cooling system is complicated, and you need an accurate diagnosis before pulling ANYTHING apart.
 
You can get fault codes from the ATC . Have the engine idling and the temperature set to 75 degrees. Hold down the top two left buttons and the top farthest right, (floor, mix and defrost). Hold them down simultaneously until the display section blinks, then release them at the same time. The display will blink for a while and then show any double digit trouble codes from 23 to 36.
 
The display can only display one code at once. To move to the next code, press and release the lower left button (panel). Continue until all fault codes are displayed. Record them and post back here.

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