Question about 1996 Jeep Grand Cherokee

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Check engine light

The check engine light came on while i was driving from wyoming to idaho. i had been punching the pedal to the floor to keep up with the 75mph speed limit when i noticed it was on. i checked all the fluids and everything is still good from when i topped them off before i left and i just had an oil change the day before...any ideas?

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Have it scanned. Autozone will do it for free.

Posted on Jun 22, 2009

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Have an fx45.Should the tach read 25-3000 ROMs when moving at 75mph? Auto tranny seems like it should be in higher gear.


there is not info to be able to give a definite answer
to work it out
you have top know the diff ratio, wheel tyre circumference to be able to work from rpms of the engine to road speed
However as a pointer, most cars will be around 3200 rpms at 60mph as this will be direct drive and od causes a drop in rpms
Being an automatic find yourself a good section of low traffic road and start from stop slowly increase the rpms and watch the rpms. keeping the accelerator steady you will see when the auto changes by a drop in rpms. slowly increase road sped until you see the next drop in rpms and so on. Over drive normally comes in around 55 mph or around 3000rpms
I would think that it is working because 3500rpms at 75mph is reasonable rpms to be expected. If it wasn't working I would expect the rpms to be around 3800 to 4000.at 75mph

Feb 07, 2015 | Cars & Trucks

1 Answer

No speed when gas pedal is to floor tranny light came on


With the oil light coming on and the brake pedal being hard to press I would say that the engine stopped hence no vacuum -no power assist from the booster.- hard brake pedal. The lock uo feeling may come from the engine seizing up while you were still in gear

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1 Answer

2011 VW Polo Roaring on Acceleration


now is the car 2017 plated or 2011 plated
as there is a vast difference between new and second hand new to you
Next question is it automatic transmission or CV transmission
With automatic as you increase rpm the car will accelerate and you will feel ratio changes up to the point where road speed = engine rpm for that throttle setting
With a CV transmission ( constant velocity transmission ) there is a torque converter but that is where the automatic action ends
In the transmission there are 2 pulleys with a big belt that can vary the ratios by pulling the flanges together on one and expanding on the other
This gives an infinite number of ratios and is designed to keep the best ratio selection for the torque band of the engine
SO how does it affect your driving
If you floor the pedal on take off, the engine will red line and stay there until road speed builds up
OR you ease back on the pedal and the pulleys start to change the ratios to suit the power band
How to drive it
when you want to take of push the pedal down to around 2500 rpm the car will take of normally
as the road speed increases , ease off the pedal and it will keep altering ratios until the correct road speed is reached for the rpm on the dial
The only catch that you will have to get used to is when going to pass at speed , you tend to floor the pedal to get past quickly but it will not down change ratios until you ease of the pedal and then the car will speed up to the rpm that you are holding it at
IT is different in driving and you will have to learn to drive to rpm not road speed and then it will behave normally ( set the rpm by the pedal and the transmission will catch up and to make it catch up , ease of the pedal in stages , just like a conventional automatic

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The check engine light comes on intermittently and will affect the speed going up hill, were i can press the peddle to the floor without a change in speed. what should i check or replace?


Check what codes have been thrown. If the TPS or Throttle Position Sensor is going bad, it could explain why pushing the pedal to the floor doesn't help much.

Codes are stored in the computer even if the check engine light comes on intermittently.

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During highway driving, my 2005 Ford Excursion Diesel seems to vibrate intermittently @ 2000 RPMs and speeds between 62 - 75 MPH. I can accelerate through the vibration or keep RPMs below 2000 to...


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If the brake pedal goes to the floor with the car off, I would suspect air in the system or some other issue with the service brakes. If you feel and hear a growl in the pedal when it goes to the floor then your abs controller may be at fault. There are many possibilities. In either case if your pedal goes to the floor, then you are looking at a safety issue. Generally the service brake system (regular brake system) is the fault and not the abs. I have however seen a sticking dump valve or faulty wheel speed sensor cause an abs issue. Start with the basics first. Leaky wheel cylinders/ calipers, brake lines, or master cylinder. Verify the hydraulic integrity of the service brakes before tackling an abs issue.

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Driving and car doesn't want to go over 2500 rpm's.


It sounds more like a faulty fuel pump. Usually a sensor problem will switch the computer into default mode and it will keep running but give you an engine light. Sounds like it is not getting fuel. It can be checked for fuel pressure by a mechanic with a guage. They can also check stored codes in the computer for faults. If it's a sensor, it should show up in the memory.

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1 Answer

Engine light flashes


it is the catalist that is obstructed,the stone is broken inside,by temp it fails to let enough air through,
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