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P0302 Misfire Diagnosis and Repair for 2000 Oldsmobile Bravada - How to Fix Without Spending Much

Model: Oldsmobile Bravada Fault Code: P2177 Posted: 2017-09-03 14:48

My 2000 Oldsmobile Bravada is running rough, feels rich, and fails smog inspections. A friend suggested fuel injector #2 might be the issue, while another pointed to a misfire code. The car is unreliable—sometimes it backfires, RPMs spike unexpectedly, and I’ve had to rev it to bring them down. After using fuel injector cleaner, the sound has improved slightly, but the problem persists. I need practical, low-cost steps to diagnose and fix this without spending much. My local muffler and smog station said if it's a fuel injector issue, repair costs could be around $700 (with $100 labor). I’m trying to avoid expensive parts replacements until I know for sure. I’ve already checked the OBD2 code reader—both showed P0300 and P0302. Is P0302 specifically related to fuel injector #2? And is it safe to assume that a misfire means an injector leak or failure? What should I do next? How can I diagnose this myself affordably before replacing parts? Any reliable DIY tips or resources would be greatly appreciated. Thanks in advance for your help!

Related fault codes

P2177

Comments (4)

Anonymous 2017-09-04 08:10

Bess: Start by scanning the vehicle with an OBD2 code reader. Many auto parts stores (like AutoZone or Pep Boys) offer free code reading services. Once you have the exact codes, post them here—our community can help interpret what they mean and suggest next steps.

Anonymous 2017-09-04 15:01

Hello Mohawkmtrs, Thank you for your suggestion. I’ve already tested with a code reader and found both P0300 and P0302. Is P0302 specifically indicating fuel injector #2? The seller previously mentioned one injector was leaking, which is why the car requires floor pedal pumping to start and sometimes backfires. A few days ago, RPMs spiked dramatically and wouldn’t drop—when I pulled over, I tried revving it down, but that didn’t work. It eventually stopped on its own. I’ve used fuel injector cleaner, which has helped slightly—the engine now sounds less like a 'jalopy'. What’s the next step? Any advice? I visited my local smog station and they said if it's a fuel injector issue, repair could cost about $700. Labor is around $100 per hour. I don’t want to spend much, but I just need it to pass smog and be reliable again. Thanks for your help! Take Care, Bess

Anonymous 2017-09-06 09:32

Bess: P0302 indicates a misfire in cylinder #2—not necessarily due to fuel injector failure. There are several possible causes, including faulty spark plugs, ignition coils, or even vacuum leaks. For more details, refer to this resource: https://www.obd-codes.com/p0302 I strongly recommend diagnosing the issue properly before purchasing any parts—otherwise costs can escalate quickly.

Anonymous 2017-10-03 08:09

Thank you Mohawkmtrs. The check engine light is still on, but I haven’t invested much in repairs yet. I’m planning to take it to my reliable and honest mechanic, Humberto, in Vista, CA. It will require a few days of downtime, but it’s worth it for peace of mind. I currently own a 1996 Mitsubishi Galant manual—high mileage, used as a fleet vehicle with Superior Cement in Escondido, CA. It's registered and dependable. A bit outdated, but reliable. I haven’t driven a stick since my 1973 Datsun 240Z—I miss that car. Thanks again! If you're interested, I love cars and junkyards—what can I say? I know quite a bit about my Z, not much about the Bravada yet—but now I’m learning. I recently watched a YouTube video showing a transparent engine with slow-motion explosions, intake strokes, etc.—it was stunning. My 15-year-old son didn’t become a car fanatic like I did, but he appreciated how much I valued it. We both agree that the 2017 Corvette’s body style is one of the best in years for me—since '69–'74. Take Care, Bess