Knocking sound in 1999 Ford F150
By cracker349
@cracker349 (1)
United States
December 7, 2006 6:02pm CST
My 1999 Ford F150 8 Cyl, 4.6 liter engine has recently started making a knocking sound. The mechanic put it on a machine and couldn't find anything wrong with the engine. Mechanics where I work thought it is coming from the exhaust system and might be the catalytic converter (of which there are two--why?) I hate to replace these converters at a cost of close to $2000 if that isn't what is wrong. Can you help?
1 person likes this
1 response
@Cortney (3980)
• United States
8 Dec 06
Chevy has the same problem with their trucks knocking when you first start up. They told me that it was because the pistons had to warm up.. I didn't buy that answer.. didn't have any problems with the truck.. but we traded it for a quad cab as soon as it was right side up.
Try searching for TSB ( technical service bulletins) Sometimes they have them for vehicles. The car manufactures don't have to put a notice out for them because they are not recalls and usually are not what they consider saftey related. If you vehicle fall's within their specifications and they have a fix.. they will usually cover it. I had that happen with a GMC Jimmy and the EGR valve about ago.. there was a service bulletin on it and it feel within their specifications to fix it.
