Hey, there. I have a 1997 5-speed Dodge Dakota, two-wheel drive, V-6. During deceleration - usually when the rpm's dip below 1000 - the engine just dies. It runs fine otherwise. Basically, I'm wondering how I can fix this problem myself, beginning with retrieving the engine code from the computer. A more mechanic-minded friend of mine suggested that it's likely an engine sensor that needs to be replaced. Thanks in advance for any advice or suggestions you can offer.
Get to autozone and have them check the codes for free. It may be an O2 sensor. They're not hard to change, just make sure the exhaust is cool, spray some blaster on the threads and let it set for a while. The guy at autozone should be able to give you directions. I think there are at least two on this model, maybe three. One after the catalytic converter and two before. Well, at least one before and one after. The code will tell you which it is. You may just need to clean the area around the automatic choke. Take off the cover and look down the hole. If it's sooty looking, take a brass brush and some choke cleaner to it. Be gently and don't spray too much in there. Just enought to get it wet. Then start it up and let it burn it out. Don't spray it in while it's running.
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My first suspicion would be a crankshaft sensor. They commonly fail and will cause the condition you indicate. The next most likely candidate is a faulty fuel pump, but they rarely fail during operation. They normally fail by just not working one day. .
you have a throttle position sensor if it is bad it will make the engine rev up to like 3000 rpm @ idle. i had a wire that rubbed on the valve gasket cover and cut the wire in half I repaired it with a bu t t splice hope this helps i posted a tip that will tell you my problem let me know if this helps
on most power steering pumps there is a single wire idle up switch to compensate for load caused by pump switch is on pump check connection also try to find a clear parking lot drive in slow circle steer all the way see if engine dies while moving at slow speed will use less effort if engine doesnt die then check the p/s idle up switch
Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines.
The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced.
The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
This trans has a safety built in to default to second gear if the computer sees any kind of problem. Have it scanned. It can be an input or out put speed sensor, or even a temp sensor on the engine. If there are codes that say ratio error, take it back to who rebuilt it and hope they will take care of you. I use to give a major discount if they were not too far out of warranty.
sound like the u-joints in the driveshaft. Lay under the truck and where the u-joints are try moving the driveshaft up and down. If it moves then the u-joints are bed. This will cause a tremendous vibration under a load and the faster it spins it will smooth out.
Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
engine must be run for two and a half minutes with the air conditioner
on and rear defroster on. The more electrical load you can apply the
better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
Hold Steady Speed.
Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time
the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim
diagnostics will be performed.
Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch.
It is important to let the vehicle coast along gradually slowing down
to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim
diagnostics will be performed.
Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
Hold Steady Speed.
Hold a steady speed of 55mph (88km/hr) for five minutes. During this
time, in addition to the diagnostics performed in step 4, the catalyst
monitor diagnostics will be performed. If the catalyst is marginal or
the battery has been disconnected, it may take 5 complete driving
cycles to determine the state of the catalyst.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.