Hey all,

Pulled plenum off to look at egr sys, (shows code 32 after highway) and found that the egr temp switch wire was broken.. ie not attached. Would this alone cause code 32 to appear, or is it likely that the problem is elsewhere as well? Obviously that part needs to get replaced.

Scott

 

Its a good start. The EGR switch is grounded when the hot exhaust gas flows through the EGR. The ECM looks for this ground after it activates the EGR. If the ground does not occur, code 32 is set in the computor. A broken wire would prevent the ECM from seeing the ground.

Another thing to watch out for is during emission testing. I've seen it where the EGR fails to work and emissions test fail, yet a code 32 does not come on. The wire breaks off and grounds itself against the fuel rail or manifold fooling the ECM to think everything is working.

 

This is all for 90 and up only i belive non MAF TPI cars.
If you are talking about the temperature sensor in the underside of your plenum, ya that prolly would do it all on its own. The ocmputer uses that sensor, the water temp that comes int he trottle body and the MAP sensor to control fuel mixture. If that sensor is out it can hamper along but if it constantly reads too high or too low from the water temp then it will prolly throw a code.

 

My 88 TPI has an EGR temp/switch.

 

So does my '86:

 

90-92 cars didn't use the temp switch. It's listed as 85-89. I researsched this for my swap as the intake I'm using is from an 89 and my ecm and harness are from a 91 and the car is a 90.

 

90-92 models switcheed from Mass AIr Flow to Mass Air Proportioning sensors (speed density). The speed density system does not have a sensor on the egr valve itself. It does have a sensor that reads from INSIDE the upper intake manifold. It is used in unison with the MAP and coolant temp to regulate fuel mixture. Sounds wierd... but true.