Hi everyone, This is my first post here tonight, I am hoping someone might be able to tell me if I may have bigger issues than I am seeing. I have a 96 Tahoe 5.7l, with 150,000 miles.
I have been fighting a p0300 code for the past few months, p0305 will appear about once every 2 weeks. I have already replaced my plugs, wires, cleaned my maf which cleared 2 other codes p0172 & p0175 but didn't help the hesitation. 3 days ago I had purchased a new distributor, pcv valve, egr, coolant temp sensor and was going to install them over the weekend.
Just the next day I was leaving work, turned the key and BOOM!. I mean it was like a shotgun went off under the hood type backfire and the rpms shot up. Than some smoke followed. Popped the hood and I saw small orange flames on the top back of the engine, panicked and ran for the fire extinguisher but by the time I got back it there was nothing. I spray one puff anyway in case something was burning I couldn't see. Since it was dark decided to wait and got a ride home.
The next day I popped the hood and see a piece of cracked plastic under the air silencer box and was able to pull a piece out (first pic). Knowing this was bad led me to do some searching online, decided to order a new plenum and lower intake gasket set, valve cover gaskets and fuel pressure regulator which arrived yesterday, but as i took apart the top of the motor i was able to see it the plenum was cracked into five pieces and most of the bolt holes had cracks around them. There is a strong gas odor from the pieces as i remove them. Pic 2 shows new vs old , and the white coating is from fire extinguisher.
I am assuming either the spider or the fuel pressure regulator was leaking fuel and it somehow backfired through the intake igniting the gas. My question is will replacing my intake manifold gaskets, spider (mpi) with regulator fix my issue or what else could have possibly been damaged from such an explosive force. Could a bad egr valve cause a spark to ignite the gas vapor and possibly be responsible for my p0300 code as well? I am just trying to eliminate the possibility that its a valve issue. Sorry for the long story but I am looking for some input
thanks
I have been fighting a p0300 code for the past few months, p0305 will appear about once every 2 weeks. I have already replaced my plugs, wires, cleaned my maf which cleared 2 other codes p0172 & p0175 but didn't help the hesitation. 3 days ago I had purchased a new distributor, pcv valve, egr, coolant temp sensor and was going to install them over the weekend.
Just the next day I was leaving work, turned the key and BOOM!. I mean it was like a shotgun went off under the hood type backfire and the rpms shot up. Than some smoke followed. Popped the hood and I saw small orange flames on the top back of the engine, panicked and ran for the fire extinguisher but by the time I got back it there was nothing. I spray one puff anyway in case something was burning I couldn't see. Since it was dark decided to wait and got a ride home.
The next day I popped the hood and see a piece of cracked plastic under the air silencer box and was able to pull a piece out (first pic). Knowing this was bad led me to do some searching online, decided to order a new plenum and lower intake gasket set, valve cover gaskets and fuel pressure regulator which arrived yesterday, but as i took apart the top of the motor i was able to see it the plenum was cracked into five pieces and most of the bolt holes had cracks around them. There is a strong gas odor from the pieces as i remove them. Pic 2 shows new vs old , and the white coating is from fire extinguisher.
I am assuming either the spider or the fuel pressure regulator was leaking fuel and it somehow backfired through the intake igniting the gas. My question is will replacing my intake manifold gaskets, spider (mpi) with regulator fix my issue or what else could have possibly been damaged from such an explosive force. Could a bad egr valve cause a spark to ignite the gas vapor and possibly be responsible for my p0300 code as well? I am just trying to eliminate the possibility that its a valve issue. Sorry for the long story but I am looking for some input
thanks