Tuesday, July 3, 2012

Trans bucks when using passing gear

Trans bucks when using passing gear and Cruise control Stopped working on 2005 Chrysler Pacifica.

IS IT COMMON PROBLEM?

Yes its noticed on many Chrysler and Dodge car models.The vehicle will buck when you try to kick in passing gear and the cruise will only stay on for a few minutes and then quits or the cruise control stopped working and will not start at all.

BUT WHY CRUISE CONTROL STOPS WORKING?
The cruise control in such cases stops operating because the problem of trans bucking in passing gear.Once this issue is solved the cruise control starts working as usual.
You can say Cruise has been disabled because of the driveability problem you are having.

OK,AND WHY CAR BUCKS BADLY IN PASSING GEAR?

On this problem,i will say,first get the vehicles Computer module scanned.The scanning will give you error codes.As per error codes it will point out what part is causing the problem.
As per the issue,it points out towards problem with 
  • camshaft sensor or 
  • problem with timing alignment or 
  • it can  be problem with crankshaft gear and crank shaft gear alignment.
WHAT ARE POSSIBLE ERROR CODES THAT I CAN GET?

There are number of different OBD ERROR CODES. It can be retrieved FREE at local auto Parts Store.OR you can get free ERROR CODE retrieved at near by AUTOZONE STORE.

But in such Cases there are few possible ERROR CODES.
The codes start with a P and have four numbers.
I will mention the codes Below 
It Can be  P0340, P0344,P0016.

WHAT DOES THIS OBD ERROR CODES MEAN?

The Explanation for the OBD error codes is mentioned below.

P0016 is Crankshaft-Camshaft Timing Misalignment Bank 1 Sensor 1.
P0344 and P0340 is the CPS circuit. 

OBD P0340

The OBD error code  P0340 sets when there is a problem with cam sensor. Cam sensor failures aren't uncommon on these engines.
In some cases this error code gets set after replacing water pump or timing belt.Because if this parts are not replaced correctly then due to timing belt off  or not aligned properly.
To confirm try this , check of the 5v reference, 5v pullup and sensor ground at the sensor would be in order, and if ok then replace the sensor with a Mopar part.

OBD P0344
If the code is a P0344 then that could still be the sensor, but it could also be cam timing.

OBD P0016
If the code is a P0016 then inspect the timing belt.Its out of alignment. P0016 sets when the cam and crankshaft sensor signals are misaligned, which can be caused by a cracked flexplate or incorrectly installed timing belt.
If you have replaced the belt or water pump in near by time and this code setting directly after the belt had been off would be caused by incorrectly installing the belt 99% of the time or more. If this is the code you have, or you have a P0344 set and a cam sensor doesn't fix it, then you're going to need to go back in and double check the cam timing.It has to be properly aligned.

OK,BUT HOW TO CHECK CAM TIMING?

For that you have to remove the Timing belt cover.
There isn't a way to physically check cam timing without removing the covers again. One other thing that can be done is using a scan tool to look at the cam/crank difference, which shouldn't exceed more than 2-3 degrees at idle. If it's further than that then you have a cam timing issue.

HOW TO SET THE CAM TIMING?
If you are getting Error code P0016 then its telling that your timing is 180 Degrees out.To set the timing belt marks.Set the number one to Top Dead Center then disconnect the timing belt and align the Valves so both the valves for the number 1 are closed. Most likely this will be when the cam shaft timing mark or guide key is in the 12 o'clock position then re-install the timing belt. If you are not familiar with how to get that engine to TDC on the #1 I highly recommend you get the Haynes or Chilton's repair manual for your vehicle.
The marks on the cam sprockets are lined up to marks on the inner timing covers at just about the 12:00 (straight up) position. If yours are not lined up with the marks on the inner timing covers then there is  a cam timing issue.

IS THIS THE REASON WHY I THE VEHICLE BUCKS?

Yes you are correct.The bucking you are noticing is a rev limiter. When the engine controller sees that cam timing is incorrect or the cam sensor signal is erratic or missing then it will impose a low rev limiter, the code being set is also the reason that cruise control is disabled.

See the diagram shown below:-----
The inner timing cover is the aluminum housing behind the timing belt, sprockets and water pump.

Timing gear marks


So first get the error codes retrieved.Once you get the error code,then you can further start your troubleshooting in right direction,as explained above,for each error code.

If it's a P0340 then go ahead and replace the cam sensor,buy Mopar sensor or original sensor from dealer.But don't convince yourself for local aftermarket parts.This parts are cheap,but they don't last long and in some cases don't give appropriate results.Aftermarket parts are not bad parts,but there performance is poor.And that is what actually matters.


This details will help.
Thanks.


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Air conditioner blows air but not cold air


A/C is not blowing cold air, but seems to be running .

When the Air conditioner is turned ON,the Air starts blowing out.It blows the air of  same temperature as outside air.
Problem noticed on 2000 Dodge Caravan SXT model.

WHAT ARE POSSIBILITIES THAT CAN CAUSE THIS PROBLEM?



AC  blowing just a few degrees cooler than the air.This problem can be caused by

  • Faulty Compressor.
  • Faulty Expansion Valve.
  • Low refrigerant.

HOW TO TEST IF COMPRESSOR IS GETTING ENGAGED OR NOT?
Locate the compressor and view the pulley. On the front of the compressor is a pulley driven by the belt, in front of the pulley is the clutch. If the compressor is engaging then the clutch will be spinning along with the pulley.

OK,BUT WHERE IS COMPRESSOR LOCATED ON DODGE CARAVAN?

On 2000 Dodge Caravan A/C compressor is mounted on the front of the engine and has two large aluminum/rubber lines coming out of it.


HOW TO KNOW IF SYSTEM IS LOW ON CHARGE?

To know if refrigerant is low,the A/C pressure test tool is required.Or you can Check the A/C lines.The Aluminium lines coming from compressor.

WHERE ARE THIS ALUMINIUM LINES?

See the diagram shown below,the yellow arrow is pointing towards it.
Here is a picture showing the a/c line coming out of the compressor. 
Air conditioner Line diagram

Touch and feel the cooling line.Is it warm or cool.

WHICH LINE SHOULD BE COOL AND WHICH SHOULD BE HOT?

You should have one line coming from the compressor that is hot and one pointing in diagram that should be very cold. If you don't have one that's cold then by far the most likely cause for this would be low system charge. 

HOW TO TEST THE LOW SYSTEM CHARGE?

The first thing that will need to be done is check the system charge, either with a manifold gauge set or preferred, with a recovery machine. Most likely your charge is low because of a slow refrigerant leak, or it could be low just because of natural losses. R134a molecules are small enough that they naturally escape through the rubber over time.And its natural.By time the refrigerant gets released in very slow process and refrigerant needs to be recharged.

BUT WHAT IF REFRIGERANT CHARGE IS CHECKED OK?

If the refrigerant charge is checked ok,or even after you get the refrigerant charged the problem is same as before then,its issue with compressor or expansion valve.

BUT HOW WILL I KNOW WHAT IS FAULTY OUT OF THAT?

If charge is ok then the problem could be the compressor or expansion valve.These  can be determined by looking at the system pressures. 
  • If pressure is very high on the high side and very low on the low side then you have a restriction, most likely a bad expansion valve. 
  • If the high side is low and the low side is high, somewhat equal pressures, then the compressor isn't working.
This details will help.
Thanks.

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