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1998 Ford Ranger vacuum problem?

Tiny
RBPGURU
  • MEMBER
  • 1998 FORD RANGER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 149,000 MILES
After driving, [engine at op-temp] when accelerating engine is knocking. Any suggestions? Thanks.
Saturday, October 17th, 2009 AT 6:58 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If is not an actual engine knocking coming from the bearings or the upper end could be detonating caused by the EGR valve, the Knock sensor or an engine that's overheating
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Saturday, October 17th, 2009 AT 7:38 PM
Tiny
RBPGURU
  • MEMBER
  • 2 POSTS
Thanks. I am leaning towards the EGR valve. From my reading, it appears to be the most identified probable cause. I am not sure that I have a knock sensor. There is a vacuum valve solenoid operated regulator, too. I noted a while back, during the hot season, that when I selected the MAX AC setting, the inside/outside air flapper valve cycled from the vent location to the floor then back. Not sure if that indicates a common problem associated with the vacuum system. There is a vacuum reservoir [bulb shaped tank] that outputs to the cab, [heat/AC air flapper control]. Thanks, again.
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Friday, October 23rd, 2009 AT 8:36 PM

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