Quote:
Originally Posted by Tripler
Drove it around the block . Feels like a 6 or 4 and is still running ruff . Bought a video scope to look under the plenum .
Also on another note , the car only backfired 3 or 4 times since we have owned it since 2016 and it would only do it going down a hill with my foot off the gas pedal in second gear, just a small pop but it did not always happen . Just once in a blue moon .
Mike
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If you hear a pop going down hill with foot off, my guess is unburned fuel mixture going downstream and lighting up. This should not cause MAP blow-off. MAP sensor hose blows off when you back fire during the engine start.
Again, it's just a WAG - if MAP hose is intact and still suffering from misfire, either a fuel system issue (like fuel pump, clogged fuel filter, etc.) or a vacuum blown under the plenum.
I presume CEL is not on? Can you see if you can jump OBD and pull code?