Overheating causing code 52

SHAWN PORTER

MEMBER
1993 TOYOTA PICKUP
3.0L
V6
4WD
AUTOMATIC
2,100,000 MILES

New head gasket.
New water pump.
New thermostat.
New distributor/button.
New wires/plugs.
New knock sensor tests correct at idle from cold start.
New pigtail, and wire, test correct.
New intake gaskets.
New oil filter/oil.
Four new hoses.
New muffler.

Yes, there is still a vacuum leak whistle during driving, not found it yet.

Overdrive light flashes on and off when transmission acts up. From a complete stop it looses acceleration. Intermittently. Assuming a vacuum leak.

Once truck reaches driving temperature code 52 knock sensor.

Idle and high idle, no code.

Tonight heard a ting/ping noise at high temperature once coded. Cannot locate it yet.

Any ideas?

2 Replies

HMAC300

MECHANIC
48,601 POSTS

The code may be the knock sensor is bad or shorted wiring or an ECU. If the vacuum leak is not fixed that may be your transmission problem due to a bad running engine transmission follows suit. Recheck all your connections. Check vacuum line marked at idle should not have vacuum that may be the leak. Also, for over heat, make sure no air in system and when hot with engine off and fan disconnected check radiator for cold spots if any radiator is bad. Also, recheck your work as I am assuming you have done the work.