Followup to this thread: the issue returned. And it had followed the coil, which I had put in Cylinder 4 this time, and made sure the connector was seated. So it's a coil with an intermittent problem. It DOES happen.
Persistent misfire under load only
- Thread starter greiswig
- Start date
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Jimmy Brooks
Full Access Member
Hey all,
Getting a lot of similar symptoms with a D5 which has the SCV6. The misfire only happens under load and is mostly noticeable when the car is cold (oil is below 180) when first starting to drive. The misfire only happens around 2500-4500 RPM when under load in any gear from 4th to 6th gear. You can feel it in the form of jerking which gets faster but less present as rpms rise. Each misfire j€rk (it will sensor the normal spelling) you feel you can see it in the rpms tack, the tack will move down about 50-100 rpm each time. I got a code for random misfire and then cylinder 3 misfire a while back but I cleared it when I got an oxygen sensor code and replaced the sensor. The misfire is still there but I haven’t been able to get a code to come back. I replaced the injector spark plug and coil on what the scv6 diagram labels as cylinder 3. It is still there, I am currently in the process of doing the same thing to cylinder 2 (would be cylinder 3 on the V8). But I am not confident that this will fix it.
Would love to hear some thoughts and share more information if anyone could make sense of this. Let me know if anyone has any ideas, I’d like to avoid spending thousands on diagnosis and fixes at an indi shop.
Getting a lot of similar symptoms with a D5 which has the SCV6. The misfire only happens under load and is mostly noticeable when the car is cold (oil is below 180) when first starting to drive. The misfire only happens around 2500-4500 RPM when under load in any gear from 4th to 6th gear. You can feel it in the form of jerking which gets faster but less present as rpms rise. Each misfire j€rk (it will sensor the normal spelling) you feel you can see it in the rpms tack, the tack will move down about 50-100 rpm each time. I got a code for random misfire and then cylinder 3 misfire a while back but I cleared it when I got an oxygen sensor code and replaced the sensor. The misfire is still there but I haven’t been able to get a code to come back. I replaced the injector spark plug and coil on what the scv6 diagram labels as cylinder 3. It is still there, I am currently in the process of doing the same thing to cylinder 2 (would be cylinder 3 on the V8). But I am not confident that this will fix it.
Would love to hear some thoughts and share more information if anyone could make sense of this. Let me know if anyone has any ideas, I’d like to avoid spending thousands on diagnosis and fixes at an indi shop.
powershift
Full Access Member
Are you using the GAP? I've read that it can give the wrong cylinder number.
Jimmy Brooks
Full Access Member
I know, which is why I did coils plugs and injectirs on cylinder 3 on the V8 pattern and the V6 pattern no difference.
