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Check engine light after putting supercharger back on

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1.4K views 10 replies 3 participants last post by  jjl04002  
J
#1 · (Edited)
Hello again,

So I wrapped up my serpentine belt install via pulling and replacing the supercharger (previous post), and after driving around yesterday my check engine light came on. I am heading to the track tomorrow so I am hoping I can get some quick advice.

I read the codes and had the following: U1900 and P0300. The U code appears to be electronic, and the P is random engine misfire. I cleared the codes and tightened up my duct connectors (with a wrench this time, not a screwdriver) especially near the intake manifold, and re-seated the sensors that I could reach (there was one under the blower that I can't reach without pulling the ducting back off, but it looks secure. It plugs into the engine via a cutout in the blower plate, none of the connectors seemed loose).

I haven't gotten the codes in another 2 hours of driving, and I have been logging misfires and seem to get 1-2 around startup below 2000 RPMs and then nothing for at least 15 minutes after.

I don't know what to make of the U1900 code and if it is related. When the light came on I was going down a steep hill where it meets a flat. I wonder if the bump could have jarred something.

Any suggestions for further diagnostics or should I wait and see? Also, has anyone had the U1900 code randomly occur?
 
#2 ·
did you tighten the SC within torque specs and sequence?? maybe a vacuum leak at idle speed where the air moves slower through your SC.
 
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J
#3 ·
The SC itself stayed intact, it was only the plate that holds it that had to come off. I did need to pull ducts though. I should also mention I revved the engine after install (but before the errors) and put soapy water near the joints and found at least one leak in the seal for the intake manifold. That's why my initial thought was that I may still be missing a leak.

I just rechecked the manual and they don't give any torque specs for the plate/ducting, so no...
 
#10 ·
some one had said that too rich of a fuel mixture could cause p0300, not too sure i believe him. but it could be!?!?!
 
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