Technical Car Experts Answers everything you need: erratic shifting

Showing posts with label erratic shifting. Show all posts

Saturday, January 19, 2013

Jeep Wrangler Erratic Shifting

1999 Jeep Wrangler Under Full Throttle Jeep Shifts At 4k RPM

Throttle Shifts In and Out of Overdrive.

It can be issue with TPS also called as Throttle Position Sensor.

As per our Auto garage repair Experience I will share few troubleshooting tips regarding the cause and solution to this problem

As per what you mentioned I expect more than 4,000 RPM at wide open throttle but not much more than that.

We at our Auto garage have noticed many such problems it's very much possible that low engine power is the issue.
Another possibility is Low fuel pressure.
Low fuel pressure could cause it but that would usually come with spark knock on acceleration.
But as you mentioned low engine power and erratic shifting with no error codes retrieved the most common cause of lack of engine power with no codes is a restricted catalytic converter due to internal breakup.
To confirm the problem.
A backpressure test can be done to check the converters.

There are many other possibilities that can too cause these issues:-------
Like transmission related:-----
There are a couple things transmission related that could cause it too.
As per your jeep brand and model/ year mentioned , it has primitive three speed trans with a mechanical governor in the tail housing. As per what i recollect these governors gave some trouble over the years with the governor valve sticking in the bore and causing shift issues.May be what exactly you are noticing, called low engine power and erratic shifting. It's very possible that the governor is stuck. To confirm whether governor pressure is issue.Governor pressure can be checked with a pressure gauge on the governor pressure tap on the trans.

As earlier mentioned it can be faulty throttle position sensor, but also It's possible that the throttle valve cable could be misadjusted too.
To understand throttle cable working read the following:-----
The throttle valve cable goes from the trans to the throttle body.Now when you open the throttle it moves the throttle valve in the valve body and this has a huge influence on shift timing. If the cable was adjusted too long it would cause upshifts to be early.And may be these is what your problem.

As per your problem mentioned there is no one confirm solution to be pinpointed but there are few possibilities.Each can be possible.So looking at all possible issues will help you know what caused these issue on your jeep wrangler.

Like its mentioned before the erratic shifting is a common symptom of a governor issue or misadjusted throttle valve cable so those two things are where you're going to need to start.

Like other possibilities, it can be a leaking front clutch too, but definitely start by addressing these other things.

For overdrive issue which you mentioned is actually torque converter lockup, it's a three speed transmission. Since you're having erratic idle and torque converter clutch operation at the same time it's extremely likely that the throttle position sensor issue.
I suggest get the TPS inspected and replaced and see if same problem is there or its gone.
If you need to confirm the issue with TPS before getting New TPS, you can try these simple TPS test procedure.When it's idling erratic you can unplug the sensor, if the idle calms down then you know the TPS is the problem.

At out garage we have also seen in some cases that problem was actually not TPS but it was with TPS connector terminal grip, replacing the connector may take care of problems. If you do replace the TPS be sure to use a Mopar sensor to avoid future problems.It a good reputed brand of parts.

These details will help.
Thanks.

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Friday, November 30, 2012

Gear Shift Handle Broken

Ford Gear Shift Handel Replacing

First the outer shift handle bezel needs to be removed.You aim is inner shift handle shroud.
Once you gain Access to the the shift handle shroud,you just have to release the shift knob.

See below the complete factory service manual procedure with helpful diagrams to perform gear shift handle replacement procedure:-----

ford shifting handle

Further procedure is as follows :----

GEAR SHIFT HANDLE REMOVAL

replacing gear shift handle

Installation procedure for gear shift handle is as follows:-----

No gear shift

These details and diagram will help you.

Thanks.

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Saturday, March 10, 2012

Rough idle,staling and Erratic shifting?

Multiple Problems on Mercury Cougar.
There are many possibilities that can cause this.

First of all inspect the EGR valve and head gasket.

A worn out EGR valve and cracked leaking Head Gasket can cause such problem.

You might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this.

Also, your throttle body may be carboned up and need to be cleaned. This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing to do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, its recommended to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Check for the following conditions:-----
Poor connection at PCM or IAC motor. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage.
Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system.
Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.
Vacuum leak. Check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, faulty or incorrectly installed PCV valve, leaks at intake manifold brake booster hose disconnected, oil filler cap, oil level indicator loose or missing, etc..

Possible Causes
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the PCV system and in its related hoses and/or valve
Idle air inlet passage or throttle bore is dirty or full of deposits
IAC valve has failed
MAF sensor is dirty, "skewed" or installed improperly
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high.

One more thing if the transmission uses engine vacuum, then chances are the shifting is related to the engine performance... Chances are you just have a vacuum leak and it is affecting everything else. Do not use the old EGR valve back in. Perform a smoke test to the intake for vacuum leaks or maybe use some carb cleaner to find a leak. Of course.. be very careful. Also, check engine vacuum with a gauge at idle.

Another possibility is that,you might just have a bad pickup inside the distributor, lazy IAC motor, mass air flow sensor or even engine coolant temp sensor. You could check ignition timing and even the distributor signal while the engine is running. Obviously, just be sure the fuel pressure and the tune up parts check out ok.

If any engine noise is heard while Accelerating then,you could replace the o2 sensor that might have been contaminated.. that would be a good start.

IF the engine is making noise on accelerating, it could be lots of things. IF you are confident that it is the timing chain, then yes.. you could replace it.
Again, just be sure that the ignition timing is ok as well as the tune up parts. I would stick with the oil that is recommend by the manufacture in your owners manual.

This details will help.
Thanks.

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Transmission is shifting erratically?

Erratic shifting noticed while driving.

In this problem,there are few possibilities,that are to be checked and inspected.

The list of possible parts to be inspected are as follows :----

Inspect & Check Transmission Modulator(Automatic).If Modulator Is Leaking Fluid into the Vacuum System the Erratic transmission shifting will be noticed.

Inspect & Check Transmission(Capacity).If the transmission Fluid Level Incorrect then erratic Shifting will be noticed.

Inspect & Check Transmission Fluid Type.If Transmission fluid is Contaminated Or wrong Transmission Fluid is filled then Shifting problems will be noticed.

Inspect & Check Transmission Filter (A/T).A Clogged or Dirty Transmission Filter can cause shifting problems.

Inspect & Check Automatic Transmission.In some cases Its Internal Transmission Problem.This has to be checked by Proper transmission repair service shops.

This will help.

Thanks.

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