2002 Ford Ranger spark knock

Tiny
CHAS1188
  • MEMBER
  • 2002 FORD RANGER
  • 6 CYL
  • 2WD
  • MANUAL
  • 132,000 MILES
Truck spark knocks a lot under moderate loads. Premium fuel helps a little but not much. Put a code reader on it but it doesn't throw any codes. Truck has done this for many miles. I believe the spark knock is worse in the spring and summer when temperatures warm up. I've also tried several bottles of the more expensive fuel injector cleaner, no help. Truck is stock including new Motorcraft plugs. It does have a K&N air cleaner which I service every 20,000 miles.

Oil pressure needle also fluctuates at idle when the engine is warm. It has done this for many 60,000miles or so. I use 30 W in the summer and that helps.
Thursday, April 1st, 2010 AT 2:16 PM

1 Reply

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok what I would like you to do first is get some mass air flow cleaner (nothing else) and clean the mass air flow unit. Now that this is done see if it still pings. If so then I need to know if you have a digital meter and we will check the knock sensor and some other sensors ok.
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Friday, April 2nd, 2010 AT 10:48 AM

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