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Re: What does the exhaust backpressure sensor do?
[ QUOTE ]
defueling means that the computer cuts back on how much fuel is injected. The way I understand it, it acts as a sort of safety device to keep from possibly damaging the motor.
At close to WOT, I'm seeing EBP's of around 50psi. The MAP reports about 30 PSI. The CEL light comes on & the code that is there is for overboost (I discovered my pop-off valve was bad, so right now I've got nothing to fool the MAP). I don't see anything related to EBP (using AE). I'm wondering why there is a 20# difference between the two, and why the EBP is so high. I've spent some time doing searches, and I see I can clean the EBP tube & possibly replace the sensor, but would this help (it doesn't seem like the tube is clogged if the sensor is seeing 50 PSI)? I'll check MAP, EBP & Baro tonight with KOEO, but if anyone else could give me ideas on what to look at, I'd appreciate it. BTW, I don't have an EBPV anymore
[/ QUOTE ]I thought that was because the HPOP got behind a bit...Intermittent high pressure oil leakage.
This condition usually occurs when the vehicle is cold and the oil is thick. When performing a hard acceleration, the truck suddenly looses power, the check engine light comes on, and once returning to idle the engine runs rough and won't accelerate. Cycling the key may correct the concern, clearing the code from the PCM will correct it temporarily. If you can monitor data stream, at idle the ICP pressure normally is 400-700 PSI and the IPR duty cycle is 9-14%; at cruise, ICP is 700-1200 pSI and IPR is 15-20%; under normal acceleration, ICP is 1200-2000 PSI and IPR is 20-30%; and under WOT accel, the ICP is up to 3600 PSI and the IPR is 35% or higher. When the above symptom occurs, typically the idle ICP reading will be normal, but the IPR duty cycle will be high--over 20% and up to the max 50%. A "blow-by" condition has occured somewhere in the HP oil circuit. If you can get the problem to re-occur with some frequency, the most probable cause is worn or deteriorated injector or IPR o-rings. If the problem is intermittent, it could be a sticking IPR valve. Replace the injector o-rings with the latest-level kits--F8TZ-9229-AA. When replacing the IPR, make sure you get the correct part for the build date/serial number of your engine.
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