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Loud backfire after removing intake manifold and cleaning the injectors

Tiny
MAPOLO
  • MEMBER
  • 1998 MITSUBISHI MONTERO
  • 3.0L
  • V6
  • 4WD
  • MANUAL
  • 145,000 MILES
After I cleaned the injectors and to do so I had to remove the intake manifold and after I put everything back together and started the engine, it idle very rough and when I give it a bit of gas it has a loud backfire trough the exhaust pipe. Please help, I check the timing and it was fine. I have spark in all 6 spark wire. At this point I do not know what is causing this problem.
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Sunday, August 2nd, 2020 AT 12:36 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

There are a few things that can cause a backfire. For example, a vacuum leak, too much fuel, and so on. Also, if you mixed up the injector wires, it can cause the fuel to be injected into the wrong cylinder at the wrong time.

Make sure there are no vacuum leaks first. If you had things apart, it is easy to miss a hose or to have damaged one.

Next, here is a link that explains how to fix a back fire issue. Take a look through it and let me know if it helps.

https://www.2carpros.com/articles/engine-backfires-while-running

Let me know what you find or if you have other questions

Take care,
Joe
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Sunday, August 2nd, 2020 AT 7:45 PM

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