Why no more power???
#1
Why no more power???
Like the title says, my car has recently developed a power problem. I drive a 1999 miata with an MP62 supercharger (please don't hate, I bought the car like that).
Here is my problem: A week ago I went shopping and when I came back and started the car, a new rattle started. It sounded like rocks in the exhaust. Then, after the engine was hot, I tried a WOT pull and i noticed it lacked power considerably and I could hear what sounded like a boost leak... when I arrived at my house, the rattle had disappear but the engine still lacked a lot of power.
Since then I've checked all vacuums for leaks, I took off the s/c and it was in perfect condition as was the bypass valve, checked the timing, the engine compression, took off the intake manifold to make sure there really was no vacuum leak and checked the piggyback, still for leaks. I have just taken my exhaust off to see if my catalytic converter was broken but I can only see the intake side of it and it is not clogged and the exhaust doesn't rattle when I gently hit it with a rubber mallet.
Tomorrow i'll try to run it straight pipe after the down pipe to make sure that the catalytic converter is not clogged.
Does anyone have a clue what i could be? Cause I don't....
Any help would be very very appreciated!
Here is my problem: A week ago I went shopping and when I came back and started the car, a new rattle started. It sounded like rocks in the exhaust. Then, after the engine was hot, I tried a WOT pull and i noticed it lacked power considerably and I could hear what sounded like a boost leak... when I arrived at my house, the rattle had disappear but the engine still lacked a lot of power.
Since then I've checked all vacuums for leaks, I took off the s/c and it was in perfect condition as was the bypass valve, checked the timing, the engine compression, took off the intake manifold to make sure there really was no vacuum leak and checked the piggyback, still for leaks. I have just taken my exhaust off to see if my catalytic converter was broken but I can only see the intake side of it and it is not clogged and the exhaust doesn't rattle when I gently hit it with a rubber mallet.
Tomorrow i'll try to run it straight pipe after the down pipe to make sure that the catalytic converter is not clogged.
Does anyone have a clue what i could be? Cause I don't....
Any help would be very very appreciated!
#6
Compression on hot engine was 1-200 2-200 3-200 4-201
Don't have a boost gauge...
Don't have AFR gauge...
Didn't do a leak test...
But I do have OBD2 and on such detonation levels I am pretty shure a CEL would have appered. I also heard the rattle at idle and now that it has disappeared the engine has the same power issues.
Don't have a boost gauge...
Don't have AFR gauge...
Didn't do a leak test...
But I do have OBD2 and on such detonation levels I am pretty shure a CEL would have appered. I also heard the rattle at idle and now that it has disappeared the engine has the same power issues.
#8
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Compression on hot engine was 1-200 2-200 3-200 4-201
Don't have a boost gauge...
Don't have AFR gauge...
Didn't do a leak test...
But I do have OBD2 and on such detonation levels I am pretty shure a CEL would have appered. I also heard the rattle at idle and now that it has disappeared the engine has the same power issues.
Don't have a boost gauge...
Don't have AFR gauge...
Didn't do a leak test...
But I do have OBD2 and on such detonation levels I am pretty shure a CEL would have appered. I also heard the rattle at idle and now that it has disappeared the engine has the same power issues.
#11
Well the stock computer has no idea what the hell boost is nor does it know what to do with the timing at all. Don't be so shure that it would toss a cell especially since you're running tons of bandaids to confuse the sensors in the first place. While i was tunning my turbo with the xede before i finally got the ***** to go standalone i heard it ping because of lean more than once and it never popped a cell. Speaking of lean it has no clue how much fuel to add...worst yet the narrow band will not show what afr you're running. Hell you could be at 13.5 afr at 8 or 10 psi, 22 some degrees of spark and the stock computer dont give a ---- and since you have no gauges you have no clue either.