1999 Ford Ranger Knocking sound

Tiny
DREV0012
  • MEMBER
  • 1999 FORD RANGER
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 187,000 MILES
Hi, a knocking sound is coming from beneath by truck (sounds like it's from beneath). The knock gets faster when I drive faster, though I limped it home today under 15 mph. I'm not sure which part might be to blame. The check engine light came on as well. Thanks!
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Thursday, February 26th, 2015 AT 8:43 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Is the engine oil clean and full? Have you had the computer scanned to see what code is stored?
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Friday, February 27th, 2015 AT 5:17 AM
Tiny
DREV0012
  • MEMBER
Engine oil is at where it should be. I haven't had it scanned. My transmission has been slipping here and there and occasionally takes a while to get it to engage after it has been parked.
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Saturday, February 28th, 2015 AT 6:19 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I would suggest having it scanned to determine what possible areas you are dealing with. It would be helpful.
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Monday, March 2nd, 2015 AT 8:41 AM
Tiny
DREV0012
  • MEMBER
Thanks, can you recommend a good scanner?
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Monday, March 2nd, 2015 AT 9:20 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Scanners can be expensive. I always recommend actron scanners because they are priced right and work good. Keep in mind, some can only read engine codes and nothing else.
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Tuesday, March 3rd, 2015 AT 5:37 AM
Tiny
DREV0012
  • MEMBER
Thanks. I scanned my truck and it brought up a few misfire codes, which I believe are probably old, yet another issues. If I rev the engine, everything sounds ok, but when I actually drive it makes the knocking.

Here were the codes:

P0300
P0301
P0303

Any ideas?
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Friday, March 27th, 2015 AT 7:47 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
301 and 303 are specific misfires to cylinders 1 and 3. Do me a favor. Remove those spark plugs and check their condition. Also, it may be a good idea to do a compression test when you have the plugs out.
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Friday, March 27th, 2015 AT 10:02 PM
Tiny
DREV0012
  • MEMBER
I'll give those a look, but it seems to be something outside of the engine that is broken. If I rev the engine in park, there isn't an issue, but in gear it knocks like crazy. Last time I drove it, I got it home, but it knocked like crazy at even 10 mph. Sounded like something was clunking under the cab.
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Friday, March 27th, 2015 AT 10:45 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Is the change in the knock speed related to engine RPM's or vehicle speed?
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Saturday, March 28th, 2015 AT 8:42 PM
Tiny
DREV0012
  • MEMBER
It seems correlated with speed.
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Saturday, March 28th, 2015 AT 9:20 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If it is speed related, then check U-Joints, wheels, axle bearing.
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Monday, March 30th, 2015 AT 8:44 AM
Tiny
DREV0012
  • MEMBER
Thanks, I'll put the rear end up on stands and see if I can figure out where the sound is coming from
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Monday, March 30th, 2015 AT 9:40 AM

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