Knock sensor wiring issue

From Tune Ups to Oil Changes, maintenance related

Moderator: toayoztan

Knock sensor wiring issue

Postby mpg » Mon Feb 27, 2017 9:20 pm

Greetings,

I'm in need of help in figuring out out how to get the wiring right for the knock sensor, 88 ST-165, please.
The CEL shows code 52, I clear it by disconnecting the power - When the car is started, all is well, the CEL stays off until I press the gas and about 1400RPM it comes back on, stop the engine, short T-E1,check, and code 52 is back.
The knock sensor was replaced with a new one,the code was present with the old one. and wiring to it looks like crap. It has one black wire stuck firmly into it, a splice with what look like a secure plastic housed crimp connection, and about 2 inches of exposed stranded wire (exposed after I took the electrical tape off it). There is a 1/8 inch bit of braided wire sheath hanging that I thought is supposed to be the ground? I have no idea what the connection off the plastic plug is supposed to look like. I did a continuity check at the plug end that goes into the knock sensor and back to the KNK terminal (with the wiring block removed from the ECU) and it is good. I was told that what is needed to be replaced is the wire with RG-58A/U coax braided cable and run the outer braid to ground, inner to the sensor. Your help as always is greatly appreciated.
Members don't see the above ad. Register now - it's free!
mpg
Newbie
 
Posts: 17
Images: 2
Joined: Mon Apr 04, 2016 8:58 pm

Re: Knock sensor wiring issue

Postby Anoo21 » Wed Mar 01, 2017 6:37 pm

Hey I meant to get back on this because I had the same problem new sensor and I replaced the wire directly from the ecu to the sensor. Used just a regular cable"rg" wire, the copper wire directly to the sensor and the shield was to ground. I will see if I can get my pictures back up, i thought it might be in my build thread. Good luck, I was very very happy once I fixed the problem.
Image
Anoo21
Club Member
 
Posts: 607
Joined: Tue Nov 03, 2009 6:10 am
Location: Kansas

Re: Knock sensor wiring issue

Postby underscore » Wed Mar 01, 2017 7:02 pm

That wiring sounds pretty roughed up, and the knock system on these engines tends to be very picky (bad motor mounts have been known to cause knock codes). I'd suggest replacing it with properly shielded wire and go from there.
★ 1991 GTFour RC ~ "Rebel Scum" ★
It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
Build thread http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=44216
underscore
GTFour God
 
Posts: 3809
Images: 0
Joined: Mon Apr 09, 2007 11:29 pm
Location: Kelowna, BC

Re: Knock sensor wiring issue

Postby mpg » Fri Mar 03, 2017 12:48 am

I got the RG 58 wire in the mail today, found it for $1.20 per 3 feet on ebay it looks good quality and same gauge inner wire as what little is left from the original, going to run a length direct from the sensor to the wire block on the ecu plug as you mentioned to make sure it's good, but may need to go with a high temp lead.
It's just a really hard to reach fix, can't go in from the top, and the hole on the passenger side front with the wheel removed gives me 1 hand with a view or 2 hands blind, with the car on jackstands.
I'll let you know how it goes, you guys/gals are the best!
mpg
Newbie
 
Posts: 17
Images: 2
Joined: Mon Apr 04, 2016 8:58 pm


Return to General Maintenance and Repair

Who is online

Users browsing this forum: Bing [Bot] and 1 guest