Question about 2005 Mercury Mountaineer

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Vehicle jerks when driving at 50 mph.If you give it gas the rpm does move and the vehicle doesnt increase speed.

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Egr Valve--- a possible, as well a the TPS sensor

My Guess--their both bad

Posted on Mar 31, 2011

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I think it would be better if you start up with scanning your truck to pull some codes from your freeze frame first.

Posted on Jan 13, 2015

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Exactly what does the output Sensor the one and only speed sensor do on a 1994 Dodge Shadow, 2.5 Engine? Thank you.


Not the speed sensor , misfire ? plug , plug wire etc..... Check engine light on ? Have diagnostic's done on the vehicle ,check misfire counters on mode 6 . Do you know what this is ? If not your best bet ,take it to a qualified repair shop.

Sep 28, 2017 | Dodge Cars & Trucks

2 Answers

I have a 2000 chrysler 300m im having problem with fuel economy the rpm is to high i dont know if this are like that but when im hittin 55m the rpm is almost hittin 2000 rmp is there somthing that needs to...


That amounts to about 27 mph per 1000 rpm which I think is quite high gearing.

For reasons of fuel economy vehicle manufacturers tend to choose a ratio for top gear that allows the engine to run at the speed of peak efficiency when the car is cruising at the speed it will be doing for much of its life.
Here in the UK we have a national maximum speed limit of 70 mph and most cars I have driven have an engine rpm of between 2500 and 3000 at that speed, which is the rpm lots of engines produce the peak torque output or are most efficient which amounts to the same thing.

Lots of small cars when I started driving were geared for less than 15 mph per 1000 rpm.

Vehicle handbooks often give mph per 1000 rpm or the dealer should be able to tell you. I suppose it is possible your car is suffering excess converter slip if it is an auto and that is the data that will indicate it as a likelihood.
Vehicle manufacturers tend to offer a wide variety of options and equipment alternatives and one of these is usually various final drive ratios. A manual gearbox usually has a lower ratio than an auto and a car meant for hauling large or heavy loads or a car intended for export to mountainous countries or regions will have the lowest ratio fitted. Rarely a car will be released with the wrong equipment for the region, but it has happened.
Different wheel/tyre combinations also can require different ratios and of course the vehicle speedometer is generally calibrated for a single ratio and wheel/tyre combination and would be inaccurate if the specification was altered.

Lots of things to think about and lots of research to do, I guess, but I suggest you first carry out a controlled fuel consumption test and compare it with the specifications. If the consumption proves to be excessive it would be wise to have the engine sensors checked/replaced first because a high gear ratio isn't always more economical.

Feb 21, 2015 | 2000 Chrysler 300M

2 Answers

1994 Camaro rough oepration and reduced power


I have a 94, and mine ran rough until I had a new computer control chip put in. The dealer doesnt sell then anymore, so you would need to get a reconditioned one (is that the right word?) from an auto parts store. I had to get this done twice because the first one was bad so they swapped it out. There was one more thing the former owner did to fix a rough run situation, I will post it when I find the receipt. Also, it smoothed out even more when I changed out the motor mounts. WAY less vibration. I love to drive this car now!

Mar 06, 2014 | 1994 Chevrolet Camaro

1 Answer

Fast rev problem


Can you tell if the engine speed increased ?
Something in the transmission could be slipping, or the tach could be faulty.

Jan 09, 2013 | Toyota Celica Cars & Trucks

1 Answer

Obd2 system rediness status won't clear so I can run the smog test due to replacing the battery.


takes a long time to run the rediness test since there are 6 different tests to complete...

PROCEDURE 1
EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
Inspection Conditions
Engine coolant temperature: 30°C (75°F) or less (The engine is stopped before the test drive is started).
Atmospheric temperature: 5 - 30°C (41 - 113°F).
Condition of A/T: Selector lever D range.
Fuel remained in fuel tank: 30 - 50% is recommended.
Time required: 16 minutes or less after started the engine.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position. Well be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 16 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

PROCEDURE 2
FUEL TRIM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: -10 - 60°C (14 - 140°F).
Condition of A/T: Selector lever D range.
Time required: 30 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 30 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 3
CATALYTIC CONVERTER MONITOR
Drive Cycle Pattern
Inspection Conditions
Atmospheric temperature: -10°C (14°F) or more.
Condition of A/T: Selector lever D range.
Engine coolant temperature: Not set.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
Travel for 300 seconds or more while keeping the vehicle speed at 89 km/h (55 mph) or more.
Decelerate until the vehicle speed is within 80 km/h (50 mph) or less.
While traveling at 56 - 80 km/h (35 - 50 mph) for 10 minutes or more, fully close the throttle at least once in 2 minutes and decelerate for 10 seconds or more.
Do not repeat deceleration too often.
Vehicle speed may go below 56 km/h (35 mph) after the deceleration.
Stopping and braking are permitted. (If stopped or drive at 56 km/h (35 mph) or less for more than 5 minutes the monitoring may be stopped. In this case please restart monitoring from the beginning.)
After completing the above deceleration, bring the vehicle speed back to 56 - 80 km/h (35 - 50 mph) and keep it in the range until starting the deceleration again.
Repeat the above deceleration at least 5 times.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 4
HEATED OXYGEN SENSOR MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or more.
Atmospheric temperature: -10°C - 60°C (14 - 140°F) or more.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 56 - 80 km/h (35 - 50 mph).
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 56 - 80 km/h (35 - 50 mph) and travel for 16 minutes or more.
Stopping and braking during this operation are permitted. Keep the accelerator opening degree constant for 1 minute or more after each acceleration.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 5
EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: 5 - 60°C (41 - 140°F).
A/C switch: OFF.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 56 - 80 km/h (35 - 50 mph).
While traveling 16 minutes or more at 56 - 80 km/h (35 - 50 mph) with engine speed 2,000 r/min or above, fully close the throttle at decelerate for 5 seconds or more until the engine speed reaches 1,000 r/min or under.
Do not repeat deceleration too often.
Stopping and braking are permitted (Rapid deceleration and sharp steering are not permitted).
After completing the deceleration, bring the vehicle speed back to 56 - 80 km/h (35 - 50 mph) and keep it in the range until starting the deceleration again.
Repeat the above deceleration at least 8 times by fully closing the throttle valve.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 6
OTHER MONITOR (Main Components, Sensors & Switches, Wire Breakage & Short Circuit)
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature:
100°C (212°F) or less (Except engine coolant temperature sensor monitoring).
30°C (86°F) or less (Engine coolant temperature sensor monitoring).
Atmospheric temperature:
5°C (41°F) or more (Except engine coolant temperature sensor monitoring).
-10°C (14°F) or less (Engine coolant temperature sensor monitoring).
Condition of A/T: Selector lever D range.
Time required: 21 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start
Accelerate until the vehicle speed is 56 km/h (35 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 56 km/h (35 mph) or more and travel for 16 minutes or more.
Return the vehicle to the shop.
After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch to the "LOCK" (OFF) position. Moreover, the vehicle should be set to the following conditions for idling.
A/C switch: OFF
Lights and all accessories: OFF
Transmission: Neutral

Sep 15, 2010 | 1998 Mitsubishi Eclipse

1 Answer

From a stand still if you accelerate hard vehicle starts vibra


Well, kind of short on description, issues typical in this complaint are misfiring and U joints.

To emininate the engine, does the vibration happen on power braking, without the vehicle moving?

May 24, 2010 | 2000 Chevrolet Blazer

3 Answers

I have a 2007 Pontiac Torrent. For the past


you have caused catylist damage to occur a blinking light means that there is sufficient misfireing to damage the converter which is probably the jerking at the speeds u reported its not the speed but the rpm range

Mar 04, 2010 | 2007 Pontiac Torrent AWD

2 Answers

The RPM of Nissan Altima stays high when drive over 65 MPH.


No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

Aug 25, 2009 | 2002 Nissan Altima

1 Answer

Engine light on-engine pulls when driving


If you can't comply with my requests, then take the vehicle into a Hyundai Service Center and have them diagnose the problem (pay the diagnostic fee). they will give you an estimate of repairs (parts, labor, tax, time-frame, etc). Best solution I can offer you.

May 18, 2009 | 2001 Hyundai XG300

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