2001 Dodge Ram 1500 starts misfiring, sputtering after warming up
I have replaced the coil and distributor cap. Also dealer has replaced an injector. Firestone worked on it several times, no one agrees what is wrong. Runs very strong on start up, but after the heat gage starts moving, it has serious trouble. Letting off the gas it sounds like backfiring too. Loses some power...sputtering, then drives normal in spurts. Making me real nervous. Can you help?
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Hi, there are 2 common reasons for a single cylinder misfire you have not addressed it: faulty fuel injector and burnt valve.
You need a voltmeter to test the injector:
Check the resistance across the injector terminals. It should be about 12 ohms. If open or shorted, replace the injector. After removing an injector, apply 12 volts DC across the terminals. A "click" should be heard. If not, replace the injector.
If ok, then you need to do an engine compression leakdown test with cylinder compression gauge. if compression leaks down in that cylinder, then you have a burnt valve causing the misfire
I would check the injector. Pull the plug and check for corrosion. Use on ohm meter to check the injector. The resistance should be 11 to 15 ohms. Check it against another injector. they should be close. You can also check the injector plug. best to use is a noid light, but you can use the meter. set it to dc volts to check. the numbers should jump everytime it fires. since you got a 300 and 301 misfire it tells me that you have an intermitant misfire in cylinder 1. The other sensors are still good don't replace them. The coil is still good, because when it starts to go, it will have misfires on all cylinders or will not work at all. The crank sensor is the one that detects the misfire, again don't replace it because it's not bad, it's just doing it's job. If the injector and harness check out good then I would start check the cylinder for compression and mechanical problems
The pick-up coil/stator is easily replaced in a dodge distributor, and once you have removed the distributor cap and the ignition rotor, then just dis-connect the wire connector from the pick-up coil/stator and lift it straight up and out of the distributor, and the distributor does not have to be removed or dis-assembled to replace the pick-up coil/stator. There are two alignment tabs on the pick-up coil/stator that will match up with the distributor cap when the pick-up coil/stator is properly installed. Here are two images to help assist you.
SOUNDS LIKE A BAD DISTRIBUTOR CAP..REMOVE EACH WIRE ONE AT A TIME AND CHECK FOR CORROSION ON TERMINALS..IF YOU SEE ANY YOU WILL NEED A CAP,ROTOR AND IGNITION WIRES..ALSO CHECK BOTTOM OF IGNITION COIL FOR CRACKS..IF YOU SEE ANY, REPLACE IT..I HOPE THIS HELPS
CAMSHAFT POSITION SENSOR
2001 Dodge Truck RAM 1500 1/2 ton 2WD 5.9L SFI 8cyl
The Camshaft Position Sensor is located:
Under hood, center, upper engine area, rear of intake manifold, mounted in distributor
If this is helpful.Please leave ositive Feedback. Thanks, SnugglePants
hello i am a independent shop owner and i recently had a 01' dodge 1500 5.2L engine and it seemed to have the same symptoms as your car, i checked fuel pressure and it seemed to be around 49 which is still considered normal and also i did check the distributor cap and each spark point had corroded parts on the tips but before i replaced any parts i disconnected the bank 1 sensor 1 oxygen sensor and noticed that the car never sputtered again.. so in my case i recommended to my customer to first replace the o2 sensor! Hope this helps cheers!