bottle pressure high now idling funny

[eddie96gsn]

last night at a light a 04 pontiac gtp pulled up next to me and so I floored it 2 seconds later my car back fired twice so I let go then pulled over then open my hood and notice that some of my vaccum lines were disconnected and one of them was separated in half then I look at my nitrous gauge and notice that the pressure was at 1350 and my check engine light was on so I turn off the bottle and tried starting the car and it starts and sputters and dies but if I help it, it stays running but it wont go over 4000 rpms so this morning I replace the broken vaccum line and check and replaced my plugs and still the same any suggestions

 

[GSX_RCR]

Looks like you broke something, internally. Maybe blew a piston ring or burnt valve (hence the low compression and difficulty keeping it to idle/run)

The high bottle pressure means that you were probably running a little leaner than usual. Which vacuum line was it that exploded? If it's part of the fuel system (FPR, etc), then you were running extremely high fuel pressures to accomodate the additional nitrous pressure. The fuel pressure rises accordingly to the nitrous bypass solenoid (dry kit), which is directly in relation to the bottle pressure.
So more bottle pressure = more fuel pressure.
Too much fuel pressure + exploding vacuum line = insufficient fuel = lean mixture.

Do a compression test and leak down test.

 

[eddie96gsn]

thanks for the response but when I got to work I put my chrysler drb to work and found out that the map sensor voltage was to high code 0108 replace the sensor and it was fine it only cost me 60.00 bucks form the dodge store

 

[DSMJim]

Be careful of the high pressure too. 1350 will make the system lean and that will cause pistons to melt etc. Make sure your around 1050-1100 and no higher. 1350 is over a 10% pressure jump which is making the systetm overe 10% leaner. Careful..

 

[eddie96gsn]

No I would never spray that high I just forgot to turn off my bottle warmer actually I wasn't paying attention to my gauge and at w.o.t. it went boom!

 

[DSMJim]

No I would never spray that high I just forgot to turn off my bottle warmer actually I wasn't paying attention to my gauge and at w.o.t. it went boom!

I'm not sure I understand. You say you would never spray that high, then you say you were not paying attention to the gauge at wot and it went boom. Were you spraying with 1350psi or not? If you were chances are that is what melted something on your car.

 

[GSX_RCR]

I think he meant, he doesn't usually spray that high. But this time, he must have overlooked the gauge and blew a MAP sensor.

Considering the other alternatives, you got off lucky. Still doesn't explain the split vacuum lines though. Where were they located at?

 

[eddie96gsn]

Gsxrcr is right you misunderstood and for the vaccum line it was the line that went to intake manifold to the vaccum canister, and the dealership wanted 22 dollars for the part ( yeah right ) so I took a vaccum line off my 91 tsi.

Here are the pics of the vaccum line I seperated and my new motor (bye bye 420a hello 4g63)