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2008 Ford F150 Idle Rough with P2195 and P2197 Codes - Fuel Pressure & EGR Fix

Model: 2008 F150 Fault Code: P2195 Posted: 2015-10-27 16:23

Hi everyone, I'm having a serious issue with my 2008 Ford F15-0. The engine idles very roughly and often stalls when it's running. Diagnostic codes P2195 and P2197 are consistently showing up. I checked fuel pressure and found it was initially low at around 24 psi. After replacing the fuel pump and filter, pressure improved to between 34-49 psi. However, the idle issue persists—either the engine won't run or runs poorly when it does. A smoke test revealed a small leak at the EGR valve (caused by an O-ring), which I repaired. Despite this, the problem remains. I've also cleaned the MAF sensor and replaced the stock air filter with a new one. I tested each fuel injector individually and all appear functional. I'm now wondering if the injector drive module might be faulty—some sources suggest it can fail without triggering a diagnostic code. Additionally, I recently replaced the camshaft position sensor with no improvement. Fuel pressure specifications for this model are typically 28-45 psi, so my current reading is within range but still not solving the idle issue. Any further suggestions or diagnostics would be greatly appreciated.

Related fault codes
P2195P2197
Comments (4)
Anonymous 2015-10-27 17:00

Check for vacuum leaks—try the old-school carburetor cleaner spray test to identify any hidden leaks. Also, clean the MAF sensor thoroughly; avoid using an oiled air filter as it can interfere with airflow and sensor readings.

Anonymous 2015-10-27 17:43

Thanks for the reply Kev2—I already performed the carb cleaner spray test before the smoke test, which showed no leaks other than at the EGR, which I’ve now repaired. The MAF sensor was cleaned and a new stock air filter installed. I also tested each fuel injector individually, all of which function properly. Given that, I’m suspecting the injector drive module might be faulty—this component can fail silently without setting a code. I've already replaced the camshaft position sensor with no improvement.

Anonymous 2015-10-28 09:50

Consider checking the fuel trim (FT) values and O2 sensor voltages—try forcing the mixture to be richer temporarily to see if the engine responds, which could help confirm whether the sensors or control system are working correctly. I didn’t have time to do this myself—what is the recommended fuel pressure specification for your 2008 F150?

Anonymous 2015-10-28 13:03

For a 2008 Ford F150, ideal fuel pressure should be between 28 and 45 psi. Your current reading of 34–49 psi is within the acceptable range, but may still not resolve idle issues if there's an underlying electronic or sensor problem.