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?

73,845

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

73,845

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

1 of 1 people found this helpful.
19,295

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

Your Answer

Tahoe

Looking for a Used Tahoe in your area?

CarGurus has 39,463 nationwide Tahoe listings starting at $1,000.

ZIP:

Chevrolet Tahoe Experts

  • #1
    Tom Demyan
    Reputation
    850
  • #2
    Rowefast
    Reputation
    830
  • #3
    Lucia Taylor
    Reputation
    560
View All

Related Models For Sale

Used GMC Yukon
396 Great Deals out of 21,435 listings starting at $1,495
Used Chevrolet Suburban
345 Great Deals out of 21,856 listings starting at $1,999
Used Cadillac Escalade
226 Great Deals out of 11,181 listings starting at $2,000
Used Chevrolet Silverado 1500
2,074 Great Deals out of 165,860 listings starting at $1,900
Used Ford Expedition
368 Great Deals out of 19,279 listings starting at $1,295
Used Ford Explorer
828 Great Deals out of 63,572 listings starting at $1,000
Used Ford F-150
2,287 Great Deals out of 183,669 listings starting at $699
Used Dodge Durango
272 Great Deals out of 21,332 listings starting at $2,495
Used GMC Yukon XL
244 Great Deals out of 13,688 listings starting at $1,495
Used Toyota 4Runner
280 Great Deals out of 21,692 listings starting at $1,750
Used Jeep Grand Cherokee
885 Great Deals out of 70,367 listings starting at $950
Used GMC Sierra 1500
859 Great Deals out of 65,088 listings starting at $2,495

Used Cars For Sale

2017 Chevrolet Tahoe For Sale
119 Great Deals out of 19,410 listings starting at $37,999
2016 Chevrolet Tahoe For Sale
42 Great Deals out of 1,773 listings starting at $31,643
2015 Chevrolet Tahoe For Sale
70 Great Deals out of 3,239 listings starting at $24,225
2014 Chevrolet Tahoe For Sale
21 Great Deals out of 669 listings starting at $11,595
2013 Chevrolet Tahoe For Sale
38 Great Deals out of 1,450 listings starting at $6,495

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.