knocking sound from the new replaced engine

Asked by Sep 08, 2015 at 03:39 PM about the 1991 Nissan 300ZX 2 Dr STD Hatchback

Question type: Maintenance & Repair

I just replaced the engine in my 91 Nissan 300zx. When I started the car it mad
a loud noise. Sounds like a machine gun going off. What is wrong with the
engine. By the way the engine is aJDM.

4 Answers

27,795

could be anything>>>even a belt.

you may need to tighten your exuast headers?

8,740

carbon is in the combustion chamber, the engine was having its first life, then it sat. the carbon deposits dried, flaked, etc. You start it again in a different car, after sitting and you hear the dislodged deposits. Combustion chamber cleaner, an exhaust management shop system for the smoke and voila. This is normally diagnosed by the engine installer or builder if the heads stayed on and chambers were not cleaned prior to install. The operation is best performed professionally.

54,545

Did you put oil in it?

1 of 1 people found this helpful.

Your Answer

300ZX

Looking for a Used 300ZX in your area?

CarGurus has 131 nationwide 300ZX listings starting at $3,995.

ZIP:

Nissan 300ZX Experts

  • #1
    Tom Demyan
    Reputation
    470
  • #2
    Jamie Staples
    Reputation
    300
  • #3
    dandyoun
    Reputation
    240
View All

Related Models For Sale

Used Nissan 240SX
11 listings
Used Ford Mustang
555 Great Deals out of 36,485 listings starting at $1,500
Used Toyota Supra
60 listings
Used Chevrolet Corvette
188 Great Deals out of 18,532 listings starting at $3,941
Used Chevrolet Camaro
456 Great Deals out of 31,181 listings starting at $3,550
Used Mazda RX-7
60 listings
Used BMW M3
31 Great Deals out of 2,083 listings starting at $6,599
Used Mitsubishi Lancer Evolution
11 Great Deals out of 579 listings starting at $13,980

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.