Back fire

[Patrickttype]

My car has a backfire. I can't rev above 2000 rpm. I checked the MAF, changed the crank sensor, knock gauge, ignition coil, ECU, chip, and injectors. I have a Scanmaster and Powerlogger. What I see is wrong is the spark gap, which goes from 25 to 50 degrees. I guess that's my problem, but how can I fix it?

 

[broke]

What’s your fuel pressure doing?

 

[Chuck Leeper]

What I see is wrong is the spark gap, which goes from 25 to 50 degrees.

Huh??
You have a Powerlogger. What are you seeing on a data log?

 

[Patrickttype]

I hope the photos are clear enough. the first 2 photos in the park and the others in cruising. fuel press 38 Cruise and Load 43

 

[Patrickttype]

Huh??
You have a Powerlogger. What are you seeing on a data log?

have you looked at the photos Do you have idea?

 

[patttype]

My car has a backfire. I can't rev above 2000 rpm. I checked the MAF, changed the crank sensor, knock gauge, ignition coil, ECU, chip, and injectors. I have a Scanmaster and Powerlogger. What I see is wrong is the spark degree, which goes from 25 to 50 degrees. I guess that's my problem, but how can I fix it?

 

[GNVYUS 1]

When you say Spark Gap most of us will think Pic 1.

You might mean your spark advance is jumping from 25 degrees to 50?

50 degrees is higher than necessary for the car during cruise, 44 is plenty during the low load rpm cruise. 50 degrees can create a bucking feel from over advance.

You could have a crank sensor to ignition module issue, ground issue etc. Try to log the rev limit and post that.

 

[Patrickttype]

When you say Spark Gap most of us will think Pic 1.

You might mean your spark advance is jumping from 25 degrees to 50?

50 degrees is higher than necessary for the car during cruise, 44 is plenty during the low load rpm cruise. 50 degrees can create a bucking feel from over advance.

You could have a crank sensor to ignition module issue, ground issue etc. Try to log the rev limit and post that.

 

[Patrickttype]

I made a mistake, spark degree that I meant. I tried to correct but it didn't work. The car starts to misfire at 2000 rpm. I have an MS3 that I installed on the car and now the car no longer misfires and it's fine. If you ask me why I don't leave it in the car it's because it's in my other Regal I wanted to do the test. I tested my MAF and map, they are correct. Any help is appreciate

 

[GNVYUS 1]

Any details on the MS3 would help, install pics etc.

So no MS3 and the car acts like a rev limiter at 2k rpm, with MS3 on the car it's now fine?

Someone on here has to have some experience with this combo so just give us as much detail on the parts, age, pics and log data and there's a logical solution to help you so you can drive it without the MS3.