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Power Strokes
94-97 Tech
Romping idle, "missing" under acceleration, low boost, poor mileage
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[QUOTE="trevdalocal, post: 1536695, member: 31493"] Howdy, truck has recently developed a slight romp at idle, doesn't seem to matter if oil is hot or cold, but occasionally it idles smoothly, usually when cold. Engine starts up quickly, about a half second of cranking and it lights, romps moderately for a few seconds, then cleans up to the slight romp. Truck also feels like it's running on less than 8 cylinder under moderate acceleration, especially noticeable when you lug the engine down a bit. You can feel the "chugging" and hear it in the exhaust. Truck struggles to make 12PSI (according to ForScan) at WOT in 4th gear (ZF5 truck) at 2500-3000 RPM, and that's with the tow tune engaged on my DP F5 (I know, saving up for a PHP). Pretty gutless on stock. Downpipes don't look like they're leaking, firewall looks pretty clean. Truck has 162k mi, and I believe the injectors are original. The injectors sounds pretty loud and crackly on tow tune, it quiets down a bit on "stock". I don't recall them being that loud before, but I could be imagining things. Fuel filter is less than 2k mi, same for the oil, 15W-40 Motorcraft with a Motorcraft filter. T500 HPOP easily holds 3000 WOT, 500-600 at idle. I am going to clean out the FPR screens this weekend. All 8 buzz fine on a buzz test, and it passes a contribution test. Any ideas? I believe the Baro sensor is no good, as it shows 9.0PSI on ForScan, but from what I read, it shouldn't be causing these symptoms. [/QUOTE]
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Power Strokes
94-97 Tech
Romping idle, "missing" under acceleration, low boost, poor mileage
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