TeamZissou
New member
Just registered to thank everyone on here for being a valuable resource. I used to have a Land Cruiser and am used to utilizing the Ih8mud forum- since I got my 1996 4Runner a year and a half ago I've relied upon Ih8mud for any routine maintenance issues I've had (they have a section for 4Runners). This particular problem required the expertise of Toyota-4Runner.org and I'm grateful.
Anyway, I got a P0304 DTC (cylinder #4 misfire) last Monday coupled with a shuddering/shaking on acceleration. Troubleshooting in the next couple days proved difficult to recreate the issue- on a cold start everything functioned correctly, but park the warm vehicle for 10 minutes and upon restart the symptoms appear. It was a relatively even loss of power and shaking throughout the RPM range, but more noticeable above 50 MPH.
I began with new plugs- I was due anyway. That failed to address the issue, so new wires went in next. I swapped the coil packs, as suggested here, and the same cylinder misfired. At this point I took her to a mechanic since I don't have a garage and it's been cold. I wasn't up for removing the intake manifold but my mechanic did and checked the resistance on injectors 1, 2, 3 & 4. All four hit between 13.2 and 13.6 ohms- at this point my mechanic was reluctant to replace the fuel injector because he wasn't convinced it was a mechanical issue.
We compromised- since the manifold was out he swapped injectors #1 and #4- and installed new o-rings on #4. The manifold was put back together and the DTC changed to P0301 for a #1 cylinder misfire. R2'd the injector with a new Toyota one and now she runs perfect again. Wanted to share my experience with everyone because my mechanic has never replaced a fuel injector in a 4Runner and his instinct was that there was something else wrong. Thanks to everyone for getting my cylinder misfire fixed in 1 trip to the shop!
Anyway, I got a P0304 DTC (cylinder #4 misfire) last Monday coupled with a shuddering/shaking on acceleration. Troubleshooting in the next couple days proved difficult to recreate the issue- on a cold start everything functioned correctly, but park the warm vehicle for 10 minutes and upon restart the symptoms appear. It was a relatively even loss of power and shaking throughout the RPM range, but more noticeable above 50 MPH.
I began with new plugs- I was due anyway. That failed to address the issue, so new wires went in next. I swapped the coil packs, as suggested here, and the same cylinder misfired. At this point I took her to a mechanic since I don't have a garage and it's been cold. I wasn't up for removing the intake manifold but my mechanic did and checked the resistance on injectors 1, 2, 3 & 4. All four hit between 13.2 and 13.6 ohms- at this point my mechanic was reluctant to replace the fuel injector because he wasn't convinced it was a mechanical issue.
We compromised- since the manifold was out he swapped injectors #1 and #4- and installed new o-rings on #4. The manifold was put back together and the DTC changed to P0301 for a #1 cylinder misfire. R2'd the injector with a new Toyota one and now she runs perfect again. Wanted to share my experience with everyone because my mechanic has never replaced a fuel injector in a 4Runner and his instinct was that there was something else wrong. Thanks to everyone for getting my cylinder misfire fixed in 1 trip to the shop!
