Mechanics

LOSES POWER TO COIL AND INJECTORS SOMETIMES....

1996 Dodge Ram

318 engine. Sometimes this truck will lose power to the coil and injectors, has great fuel pressure always, sometimes will be driving and it will just cut out and die and you have to wait a few minutes and it will fire back up, all the time when you rev it it will be a lil hesitant right at first but revs fine with no miss, but when it comes back down to idle it will stumble a lil sometimes clearing out sometimes dying, its had 2 codes pull 1) engine coolant temp sensor which I found broke I replaced and it does ever show temp in gauge but all other gauges work, 2) coil misfire yet I've replaced the coil as well and no change, also replaced the crank sensor and no change also checked the asd relay and was fine also I noticed it does not change in idle when ac lights and turning the wheel all are on
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El6nino9
July 24, 2012.




Scan for codes and check fuel pressure first. Pressure shold 49-54 psi @idle


Hmac300
Jul 24, 2012.
Did you read the whole question? I've did both of those.


Tiny
El6nino9
Jul 24, 2012.
If your fuel pressure isn't what is specified then that can be your problem. As far as changing coolant sensor there are two one is a sending unit and the other is a sensor. Whichone did you change and what engine do you have a 5.2-5.9-3.9 or8.0 or diesel? Also try cleaning the throttle body on both sides as it will cause stalling and hesitation as well. You need an actual GAUGE measurement not it's got plenty of pressure.


Hmac300
Jul 24, 2012.
I stated the sensor, I have a pressure tester and its 50-52psi, and obviously I have a 5.2 as I stated its a 318 and I've cleaned the throttle body and that wouldn't cause it to lose power to the coil and injectors from time to time


Tiny
El6nino9
Jul 24, 2012.
Camshaft Position (CMP) Sensor

1. DO NOT disconnect distributor connector. Using an analog voltmeter,  connect positive voltmeter lead to CMP sensor signal circuit (Tan/Yellow) at distributor wiring harness connector. Connect negative
voltmeter lead to ground circuit (Black/Light Blue wire) at distributor wiring harness connector. Set voltmeter to 15 volt DC scale.
2. With distributor cap removed,  manually rotate crankshaft until pulse ring enters sync signal generator on CMP sensor. Distributor rotor should point toward rear of engine. Turn ignition on. If voltage is about 5
volts,  go to step 8). If voltage is not about 5 volts,  check voltmeter leads for good connections.
3. Repair connections as necessary and repeat step 2). If connections are okay and voltage is still not about 5 volts,  check voltage at supply circuit (Violet/White wire) at CMP sensor harness connector. If voltage is
present,  replace CMP sensor. If voltage is not present,  go to next step.
4. Backprobe PCM connector and measure voltage between terminal A17 (Violet/White) and ground. PCM is located on right side of engine compartment. If no voltage is present,  see appropriate CMP sensor
circuit test in the TESTS W/CODES  5.2L article. If voltage is present,  go to next step.
5. Check continuity of supply circuit (Violet/White wire) between distributor connector and PCM. If no continuity exists,  repair wiring harness as necessary. If continuity exists,  go to next step.
6. Check continuity of CMP sensor signal wire (Tan/Yellow wire) between distributor connector and terminal A18 at PCM connector. If no continuity exists,  repair wiring harness as necessary. If continuity exists,  go
to next step.
7. Check continuity between ground and ground circuit (Black/Light Blue wire) at distributor connector. If no continuity exists,  repair wiring harness as necessary. If continuity exists,  go to next step.
8. Observe voltmeter and crank engine. Voltmeter needle should fluctuate from 0 5 volts. If voltage is as specified,  CMP sensor is operating properly and sync pulse signal is being generated. If voltage is not as
specified,  replace CMP sensor.

Check cranks sensor between terminals "B" & "C" at connector, if any reistance is shown replace ckp. Also do "wiggle" test at ckp sensor as it can be a poor connection.


Hmac300
Jul 24, 2012.
I think I may know why its acting up, the motor I put in a year ago came from a durango that I believe doesn't have a coolant sending unit, as there is an extra harness plug near the sensor that I know went to an extra intake plug that this durango intake does not have, unfortunately that other intake is long gone.


Tiny
El6nino9
Jul 24, 2012.
Get one from a junkyard
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Hmac300
Jul 24, 2012.

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