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'01 looses engine power after 3 minutes - numerous codes
I am hitting a brick wall with this one.
I have a 2001 F-250 with 209,000 miles on it. The truck is misfiring on cylinders #4 and #8, but it did not stop me from driving it. Recently, the truck started loosing power after just a few minutes of driving. Engine malfunction light illuminates. The engine will restart right back, but looses power instantly. I have cleared all DTCs from the PCM and re-scanned the system using Auto Enginuity with Ford enhanced upgrade. Here is the list of codes:
* P0272 - Cylinder 4 injector circuit contribution / balance fault
* P0284 - Cylinder 8 injector circuit contribution / balance fault
* P0340 - Camshaft Position Sensor A Circuit (Bank 1 or Single sensor
* P0476 - Exhaust pressure control valve range / performance
* P0603 - Internal control module keep alive memory (KAM) error
* P1209 - Injector control pressure peak delta test fault
* P1211 - Injector control pressure higher / lower than desired (engine running)
* P1247 - Turbocharger boost pressure low
KOEO on-demand system test passes.
I replaced the CMP with O'Reilley's (Weber) for $25.99 (grey body). The original CMP sensor was installed by a local FORD dealer when the recall was in effect. I have followed the DF diagnostics procedure from the Ford repair manual and was able to catch the resistance between CMP ground and chassis ground from 8 to 20 ohms. I got excited thinking I have identified the issue and reduced it to either a wiring issue or a faulty PCM. Turns out 8 ohms was due to dome light being illuminated, and 20 ohms is only seen when headlights are on. With both lights OFF, all wiring showed less than 1 ohm. I have also checked the resistance between PCM Test Pins 25, 51, 76, 77 and 103 and chassis ground - everything appears normal.
To aid in identification of a problem, I have monitored engine stats using Auto Enginuity while driving. When the engine is initially started, idle injection pressure is 460 psi; injector control pressure duty cycle is at 7%. During acceleration, injection pressure peaked at 2919 psi with the corresponding ICP duty cycle @ 33%. When the engine lost power, the injection pressure dropped to 340 psi, while ICP duty cycle was 64.45%, even during idling (no accelerator input).
The reported DTC codes are convoluted and the CMP really throws me off. I came across a post where a similar issue was observed and it turned out to be the IPR valve. I have studied the schematics and did not see any direct ties between IPR and CMP, unless the malfunction causes a glitch inside the PCM, resulting in an extended list of reported sensor failures.
While I have not checked my oil viscosity, I do know that I likely have a compression issue. If pistons do not keep the seal in cylinders #4 and #8, possibly allowing fuel into the oil - thereby reducing its viscosity and sheer flow properteis. Is it possible that once the oil reaches a particular temperature, its viscosity and sheer flow change and result in a cascading effect seen here? Last oil change was about a year ago, but the truck has only been driven about 1000 miles. Oil is Rotella 15/40.
* No oil leaks
* Oil level in HPOP reservoir is less than 1" from the top.
* Initial cold start gives me about 5 minutes of driving.
* After engine looses power and starts idling rought, turning it OFF and ON gives just a few seconds of driving.
* Letting the engine cool for 10 minutes gives about 2 minutes of driving before symptoms repeat.
Ready to pull what's left of my hair out....Please help!
Last edited by texaswash; 08-27-2010 at 10:15 PM.