ok enough beating around the bush im just gonna dive head first into this. im just gonna strip the motor down to the knock sensor check to see if its loose or if the wire is visibly bad. if visually nothing is wrong im gonna go to the stealership to get gaskets a new sensor and new wire. i guess after being without your truck for a week will make a few extra dollars on parts seem not so expensive

 

Ok im going crazy!!!!!!!! i just dropped a Remanufactured engine into my truck with a brand new Knock Sensor And pig tail and im still getting the same freaking problems!!!!!! it is still hesitating badly at about 3500 RPM now.
So im confused if teh knock sensor, the engine, and teh pig tail are ALL NEW what is causing the hesitation and code 52?????????????? please anyone

 

i just got the knock sensor code today.. code 52.. but no studderin... i also got a lean code and a rich code (codes 25 and 26)... so i replaced the MAF and that solved that problem... where about is this knock sensor... ill try replacing it tomm and see what happens... i gott an 88 sr5 3.0

 

OK Everyone the problem is finally fixed!!!!!. It turns out the reason i was getting a code 52 and teh studdering was because of a faulty ECM!!! my mechanic tested the knock sensor and the pigtail and the wiring harness and all of them check out OK so i ordered an ECM off of eBay and bada bing bada boom everything is running smooth. i hope this helps anyone out there with a similar problem

 

Hey, I've been having the same problem for months too, but have just been putting up with it. I adjusted my idle a bit and that seems to helped a bit, but every now and then I still get the studdering around 2500-3000RPM.
Just about ready to order a TPS from ebay when I saw this post. But I have to ask.....what's an ECM, where does it go and what does it do???
Cheers
Steve