video: p0305 misfire. using water or propane to find vacuum leak

Discussion in 'How To's' started by vincom, Jun 26, 2018.

  1. vincom

    vincom Junior Member

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    May 9, 2015
    i have a 2007 pontiac g5. was getting a lean code P0171 and used water and propane to find the vacuum leak. it was at the brake booster, it had a crack. but i didnt film it. but...
    i have a 2000 300m, 250k miles, was getting a misfire code on cylinder #5, hence the p0305 code.
    i swapped out the coil pack and spark plug w/another cylinder but p0305 misfire code on cylinder #5 didnt change.
    so either fuel, compression or vacuum leak could be the culprit.
    using water then propane i confirmed i had an upper intake plenum gasket failure


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