99 Tahoe knocking when driving

Asked by Jan 22, 2016 at 01:23 AM about the 1999 Chevrolet Tahoe 4 Dr LS 4WD SUV

Question type: Maintenance & Repair

Have a p0305 code, replaced spark plugs, wires, distributor cap, rotor, and the control module. Knocking is getting worse. Now it shutters in idle. I'm semi mechanical. Need help.
It's a 99 Tahoe 5.7 vortec. With 196022 miles.

5 Answers

45

Sounds like a misfire on one or more cylinders. It would be a good idea to replace what the scanner code reads. Have u replaced any of that stuff? Especially the SPARK PLUGS! Where does it sound like the knock is coming from? Knock from motor? Knock from electrical component?

79,005

po305 is a miss fire on cylinder #5. There is a issue going on with that cylinder. I suspect the rod bearing if you say it is knocking. The sensor is picking up the delay in firing and vibration. (knock sensor) If that plug looks like it is firing and looks clean, normal, I would suspect the rod bearing.

1 of 1 people found this helpful.

I've replaced all those those things, it sounds like a hammer slamming the motor. And starts when rpm gets to 1.5k

79,005

Either crank bearings or check the torque converter bolts. Something spinning causing the noise.

1 of 1 people found this helpful.
20,665

A misfire shouldn't make knocking noises. You got bigger issues.

Your Answer

Tahoe

Looking for a Used Tahoe in your area?

CarGurus has 40,197 nationwide Tahoe listings starting at $1,700.

ZIP:

Chevrolet Tahoe Experts

  • #1
    Tom Demyan
    Reputation
    920
  • #2
    John Carson
    Reputation
    880
  • #2
    Rowefast
    Reputation
    880
View All

Related Models For Sale

Used GMC Yukon
516 Great Deals out of 19,539 listings starting at $1,995
Used Chevrolet Suburban
518 Great Deals out of 23,485 listings starting at $1,995
Used Cadillac Escalade
277 Great Deals out of 12,214 listings starting at $2,995
Used Chevrolet Silverado 1500
2,774 Great Deals out of 158,085 listings starting at $1,000
Used Ford Expedition
491 Great Deals out of 20,301 listings starting at $1,500
Used GMC Yukon XL
299 Great Deals out of 13,403 listings starting at $1,750
Used Ford Explorer
1,142 Great Deals out of 68,757 listings starting at $1,200
Used Ford F-150
3,116 Great Deals out of 231,593 listings starting at $1,300
Used Jeep Grand Cherokee
916 Great Deals out of 71,715 listings starting at $900
Used Dodge Durango
274 Great Deals out of 25,034 listings starting at $1,500
Used GMC Sierra 1500
1,161 Great Deals out of 62,192 listings starting at $1,295
Used Toyota 4Runner
349 Great Deals out of 29,855 listings starting at $1,500

Used Cars For Sale

2018 Chevrolet Tahoe For Sale
5 Great Deals out of 16,086 listings starting at $35,918
2017 Chevrolet Tahoe For Sale
118 Great Deals out of 5,695 listings starting at $34,811
2016 Chevrolet Tahoe For Sale
34 Great Deals out of 1,496 listings starting at $31,643
2015 Chevrolet Tahoe For Sale
183 Great Deals out of 4,254 listings starting at $20,795
2014 Chevrolet Tahoe For Sale
38 Great Deals out of 743 listings starting at $10,900

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.