Question about 2002 Dodge Grand Caravan

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ROUGH IDLE / ENGINE SURGE

AT IDLE WITH FOOT ON BRAKE , RPM'S SURGE UP THEN DOWN. NO FAULT CODES PRESENT. TRANSMISSION SHOP SAYS TRANNY FINE.TOOK VAN TO DEALER 400 DOLLAR TUNE UP AND PROBLEM IS STILL THERE

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  • Anonymous Mar 26, 2014

    when idling motor rpm will go up and down a few rpms - will not start on first try- must turn key on like it is a diesel and then it will start no problem (electronic?)check engine light on - code says egr

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Check for vacum leaks on hose going from the intake to the brake booster. Also check the dodge.com website. Click on the for users button. Enter in last eight digits of vin and see if pcm (computer) needs a update, or if there is any other open recalls on the van.

Posted on Jul 21, 2008

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Auto transmission not changing down to 1st stage while in motion, causing the car to buck. I stomp on the gas pedal to kick it down it loses power and takes at least 1 second to respond.


Auto transmission not changing down to 1st stage while in motion ? You mean not down shifting to first gear ! Which transmission does your cavalier have ?
Automatic Transaxle - 3T40 Automatic Transaxle - 4T40-E
Some of this may be over your head , if so I suggest you take it to a qualified repair shop .
Electrical/Garage Shift Tests
Perform this test before a hoist or road test in order to make sure that electronic control inputs are connected and operating. If you do not check the inputs before operating the transmission, you could misdiagnose a simple electrical condition as a major transmission condition.
Use the scan tool on the Hydra-Matic 4T40-E transmission for valuable information and accurate diagnosis.
  1. Move the gear selector to Park (P) and set the parking brake.
  2. Connect a scan tool to the DLC terminal.
  3. Start the engine.
  4. Connect power to the scan tool.
  5. Verify that the following signals are present on the scan tool:
  6. ?€¢
    Engine speed (RPM)


    ?€¢
    Transmission input speed (Turbine)


    ?€¢
    Transmission output speed


    ?€¢
    Vehicle speed (miles/hour)


    ?€¢
    A/B/C Range


    ?€¢
    PRNDL select


    ?€¢
    Desired PCS


    ?€¢
    Actual PCS


    ?€¢
    PCS duty cycle


    ?€¢
    Brake switch


    ?€¢
    Engine coolant temperature (Coolant)


    ?€¢
    Transmission fluid temperature (Trans Temp)


    ?€¢
    Throttle angle (TPS)


    ?€¢
    System volts

  7. Monitor the BRAKE SWITCH signal while tapping the brake pedal with your foot. The brake switch signal should be:
  8. Released -- when the brake pedal is released
    Applied -- when the brake pedal is depressed
  9. Monitor the PRNDL SELECT signal and move the gear selector through all the ranges.
  10. Verify that the PRNDL SELECT value matches the gear range indicated on the instrument panel or console.
    The gear selections should be immediate and not harsh.
  11. Move the gear selector to Neutral and monitor the throttle angle signal while increasing and decreasing engine RPM with the accelerator pedal.
The throttle angle should increase with engine RPM.
Functional Test

Step

Action

Value(s)

Yes

No

1

Perform the Transmission Fluid Check .

Is the fluid level correct?
--
Go to Step 2
--

2

Check for PCM trouble codes, both current and history.

Are PCM trouble codes present?
--
Go to Diagnostic Trouble Code Identification
Go to Step 3

3

  1. Perform the Electrical/Garage Shift Tests .
  2. Perform the Road Test .

Was the condition duplicated?
--
Go to Step 4
Go to Step 12

4

Is a harsh or soft shift condition present
--
Go to Step 7
Go to Step 5

5

Is the vehicle's performance poor?
--
Go to Torque Converter Evaluation section of Torque Converter Clutch Diagnosis
Go to Step 6

6

Is the engagement into Drive or Reverse delayed or missing?
--
Go to Step 7
Go to Step 9

7

Perform the Line Pressure Check .

Is the line pressure correct?
--
Go to Step 8
Refer to Symptom Diagnosis Charts

8

Inspect the transmission wire harness connectors and the transmission range switch.

Was the problem found and corrected?
--
System OK
Refer to Symptom Diagnosis Charts

9

Is vibration or noise a problem?
--
Refer to Vibration Test Procedure of Torque Converter Clutch Diagnosis
Go to Step 10

10

Is the fluid leaking?
--
Refer to Fluid Leak Diagnosis and Repair
Go to Step 11

11

Are other transmission conditions present?
--
Refer to Symptom Diagnosis Charts
Go to Step 12

12

The condition is intermittent.

Re-examine the complaint.
--
Exit Table
--
No Engine Braking; Manual First - First Gear

No Engine Braking; Manual First -- First Gear
Checks

Causes

Coast Clutch

No apply (Refer to No Engine Braking; All Manual Ranges )

Lo and Reverse Servo

No apply (Refer to No Reverse or Slips in Reverse )

Pressure Switch Assembly (13)

Leaking or inoperative

#1 Checkball

Missing
Tech 1 Data Value Examples
Table 1:
Engine 1
Table 2:
Engine 2
If you have completed the On-Board Diagnostic (OBD) system check, if the diagnostics are functioning properly and if no DTCs display, you may use the Typical Scan Values in the table below for comparison within the appropriate transmission. These typical values are an average of display values recorded from normally operating vehicles. They represent the display from a normally functioning system.
You should never use a scan tool that displays faulty data. The problem should be reported to the manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used in this manual for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis.
Scan tests are performed under the following driving conditions:
?€¢
Idle


?€¢
Upper radiator hose is hot


?€¢
Closed throttle


?€¢
Park or Neutral


?€¢
Closed Loop


?€¢
Accelerator OFF


?€¢
Brake not applied

Parameters that are marked with an (*) asterist are also valid in the Engine 2 list.

Engine 1
Tech 1 Parameter

Units Displayed

Typical Scan Values
*Engine Speed
RPM
100 RPM from the desired RPM
*Desired Idle
RPM
Varies
*ECT
C?°(F?°)
85?°-115?°C (Varies with coolant temperature)
*MAP
kPa, V
1-3V (Varies with vacuum and Baro pressure)
*Baro
kPa, V
3-5V (Varies with altitude and Baro pressure)
*TP Sensor
V
.200-.900V
*TP Angle
%
0%
*Ignition Volts
V
12.0-15.0V
Loop Status
Open/Closed
Closed
TCC Brake Switch
ON/OFF
OFF
Engine Run Time
Hr:Min:Sec
Varies since start up
# of Current DTCs
#
0

Engine 2
Tech 1 Parameter

Units Displayed

Typical Scan Values
A/C Request
Yes/No
No
Cruise Engaged
Yes/No
No
TCC Enabled
ON/OFF
OFF
TCC Slip Speed
RPM
Varies
Trans. OSS
RPM
0
Trans. Range
Invalid/Low/Drive2/Drive3/ Reverse/Park/Neutral
Park/Neutral
km/h (mph)
km/h (mph)
0
?© 2016 General Motors Corporation. All rights reserved

Aug 23, 2016 | 1996 Chevrolet Cavalier

1 Answer

Why wont my car idle, drives fine but I have to keep accel pedal pushed in to stop RPM dropping below 700 RPM & stalling?


have the fault codes read to find the sensor that has failed
if it happening when you have the foot on the brake, it could be a problem brake booster

Apr 10, 2016 | 2001 Hyundai XG300

1 Answer

1989 chevy astro van rough idle/runaway acceleration


There is a "spider" injection system in the intake manifold. Check that.

Mar 13, 2014 | Cars & Trucks

3 Answers

2001 Pontiac Montana transmission will not shift into overdrive


sound like Modulator elect fault.... worth doing this first lot cheaper than tranny rebuild

Nov 09, 2013 | 2001 Pontiac Montana

1 Answer

92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

Feb 17, 2012 | 1992 Nissan Pickup

1 Answer

I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


  • does the engine miss? bumps is a rythmic pattern?
  • an engine miss will appear to diminish at higher rpm due to centrifical force.
  • other possible problem broken or flat motor mount.
  • is the idle rough in reverse?
  • if not
  • open hood
  • start engine
  • Left foot on brake (hard)
  • start engine
  • watch engine as you select drive
  • still holding brake with left foot / throttle gas with right foot
  • does engine dramatically move?
  • if so replace motor mount on offending side
  • if not possible engine miss or transmission problems

Jul 10, 2010 | 1994 Honda Accord

1 Answer

2005 ford freestyle surges while foot on brake


Its a common fault with the fords.The air throtle idle valve needs to be replaced.Or you may call it a tapper valve.

Jul 06, 2009 | 2005 Ford Freestyle

2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

1 Answer

Rough idle stalls at low rpm's


hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck

Sep 14, 2008 | 1988 Honda Accord 4 Door

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