akelts Posted June 17, 2011 Share Posted June 17, 2011 My first post since joining...and probably a stupid questions so go easy on me What the heck is this sensor? I crawled under to change my oil for the first time and saw this on the drivers side rear of the engine. Looks like the connector busted and the PO got creative with some bailing wire to hole things together. Wondering if this is the source of my hesitation under light acceleration? Close up: From further back for more perspective: Thanks for any help. Aaron Link to comment Share on other sites More sharing options...
juan Posted June 17, 2011 Share Posted June 17, 2011 That is the Knock sensor. Link to comment Share on other sites More sharing options...
dakineJ Posted June 17, 2011 Share Posted June 17, 2011 Welcome . :wavey: Link to comment Share on other sites More sharing options...
akelts Posted June 17, 2011 Author Share Posted June 17, 2011 Thanks for the info and the welcome! I will be replacing that for sure. Would the junkyard be my best bet for finding the connector that plugs in to the sensor? Link to comment Share on other sites More sharing options...
64 Cheyenne Posted June 18, 2011 Share Posted June 18, 2011 Yup, can be had off of an XJ also. Link to comment Share on other sites More sharing options...
Naterenfo1 Posted June 20, 2011 Share Posted June 20, 2011 You sir, have a nice camera! and Welcome! -Nate Link to comment Share on other sites More sharing options...
jpnjim Posted June 20, 2011 Share Posted June 20, 2011 Of the 4.0L's, only the 1987-90 Renix engines have that knock sensor. Basically, the computer is set up with a more aggressive timing curve than the later HO's, and it uses the knock sensor to tell it when to retard the timing. That said, I've run Renix 4.0L's with the knock sensor, and did not experience the hesitation you have. Link to comment Share on other sites More sharing options...
philbert001 Posted June 20, 2011 Share Posted June 20, 2011 That said, I've run Renix 4.0L's with the knock sensor, and did not experience the hesitation you have. :agree: I would start simpler. Cap, rotor, plugs, and wires. You'd be amazed how often people think they have a problem, when all they really need is a good tune-up! Link to comment Share on other sites More sharing options...
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