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P0304 Diagnostic Trouble Code Discussion for August 2019

Cylinder 4 Misfire Detected

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Trouble Ticket Help Requests for DTC P0304
Help Request Posted
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR32E73
P0304: Cylinder 4 Misfire Detected. vehicle failed emission test. p300-p304 current. p0171 and p1315 current. long term fuel trim high. 25 at idle goes up to 44.5 off idle and while driving. short term fuel trim normal, between -7 and 7 switching constantly. map has good readings around 2g a...
August 02, 2019
2001 Chevrolet Express 1500 4.3L Misfire, Misfire
P0304: Cylinder 4 Misfire Detected. ... vehicle came to our shop with the following codes stored p0300 (random misfire),p0410 (air injection fault),p0341 (cmp circuit range/performance), p0171&p0174 (system too lean bank1&bank2). Long story short after fixing a few defective vacuum ...
August 15, 2019
2001 Toyota Celica GT 1.8L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: JTDDR32TX1
P0304: Cylinder 4 Misfire Detected. The car came in running rough scanned and found the codes above.Plugs were gas fouled and replaced them, Had known good AF sensor on shelf with no change ( Also ordered new Denso sensor didn't help, Fuel pressure looks good, Checked grounds on right fender...
August 27, 2019