Question about Dodge Dakota

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Im idling at the light in my 2000 Dakota R/T and all of a sudden my check engine light comes on and the engine develops a miss and starts to smoke. Diag code says misfire in #5 cyl and there is a rich raw fuel smell from exhaust. I have 175K trouble free miles and have checked compression which reveals worn but good piston rings.I replaced head gaskets and of course still exists. When I got a hand to crank while I checked voltage at each injector, #5 showed higher than the rest at all times without dropping to zero, so i'm replacing the ECM which controls signals to injectors. Oh yeah I replaced #5 injector before voltage check to no avail. Tell me if you think Im on the right track replacing ECM.

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  • ricktrouble Oct 16, 2010

    All connections are clean as a whistle with no oil leaks to speak of as I keep my girl pretty much tight and right. the new ECM will be programmed with correct VIN and mileage when it arrives and should be plug and play. The way this all came about from perfect engine performance to a sudden miss while idling at a stop light screams of an electronic malfunction. I should have thought of the injector circuit and or ECM before tearing into engine but oh well,new head gaskets cant hurt at almost 200k. I'll keep you posted and do appreciate the assistance.



    Thanks.

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Hi! . Fuel injector operation is monitored when battery voltage is more than 10.4 volts, Auto Shutdown (ASD) relay is energized, fuel injector pulse width is less than 10 milliseconds and engine speed is less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) when no inductive impulse is sensed after fuel injector turns off with no other fuel injectors turned on. Possible causes are: defective fuel injector, defective ASD relay circuit, defective PCM, or defective connectors or wiring.
This applies to some Dodge Dakota vehicles:
I have found that the Power Steering Psi Switch leaks oil down the wire from the PSI switch and into the C-1 connector at the pcm, when this happens it causes the Heater O2 Sensor to short out and set the lean/rich and or misfire code. If you pull data streem and find that the front O2 is staying at 0volts, remove the c1 connector from the pcm and see if its full of oil, also pull the connector from the Power Steering PSI Switch and look for oil leaking, you will also notice that the connector will be full of oil. The only way to fix this is to replace the PSI Switch and the faulty O2 sensor. Sometimes a heater fault code will set for the 1/2 O2 sensor as well.
Before replacing the the ECM, check this and get back to me.
Im idling at the light - 9915ad7.gif
IN CASE YOU NEED TO REPLACE THE ECM, HERE IS HOW. Powertrain Control Module (PCM) is located at passenger's side front corner of engine compartment on inner fender panel. See Fig. above. If replacing PCM, new PCM must be properly programmed.
POWERTRAIN CONTROL MODULE PROGRAMMING NOTE: If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module.
To program PCM and clear DTCs from ABS and SRS modules, connect scan tool to Data Link Connector (DLC). DLC is located below driver's side of instrument panel.
1. Turn ignition on with engine off. 2. Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules.

Posted on Oct 16, 2010

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http://technoanswers.blogspot.in/2012/01/engine-stalls-when-gas-is-given.html

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Im idling at the light in my 2000 Dakota R/T and all of a sudden my check engine light comes on and the engine develops a miss and starts to smoke. Diag code says misfire in #5 cyl and there is a rich raw fuel smell from exhaust. I have 175K trouble free miles and have checked compression which reveals worn but good piston rings.I replaced head gaskets and of course still exists. When I got a hand to crank while I checked voltage at each injector, #5 showed higher than the rest at all times without dropping to zero, so i'm replacing the ECM which controls signals to injectors. Oh yeah I replaced #5 injector before voltage check to no avail. Tell me if you think Im on the right track replacing ECM.

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