Northstar Engines and System Technical Discussion Discussion, Intake Backfire in Cadillac Engine Discussion; Recently, I had an intake backfire. The smoke that was under the hood was blue. I took the cover off, ...
Automobile(s): 94 Cadillac Seville SLS, 88 Cadillac Deville, Trailblazer SS
Recently, I had an intake backfire. The smoke that was under the hood was blue. I took the cover off, and found that it was a leaking FPR. I also replaced an injector that was leaking. I haven't seemed to find any cracks in the plastic intake parts under the cover.
I put everything back together and now when I crank the car, it runs rich. I'm getting black smoke and raw gas from the tail pipes.
I was thinking of starting with the ICM, because it had the same symptoms a few months ago from a failed ICM.
just touching the plastic fuel rail probably caused it to leak. The 93-94 fuel rails are made of the same material that was recalled on the 95-97 fuel rails because of leaks and fire hazard. The 93-94 was not recalled because it was not an external fire hazard. That doesn't mean it can't leak and hydrolock your engine with fuel. Sorry to say it has to come back apart!