As most of you know, I have had my Fiero out of commission for some time. I am finally putting the engine back together. I thought I had taken enough pictures of everything to ensure I was putting everything back together in the same manner it came apart. So far, things have gone well.
The company that put my engine together apparently didn't put all the external hardware back in the block and one head. I have two threaded holes for which I don't have pictures. i need help in identifying these. The first one, I would assume is for the oil pressure sensor since it is located next to the oil filter. I apparently need to order one of these.
The second threaded hole is in the front head of the engine when it is installed. The same hole in the rear head has a plug in it. Rather than my spending a lot of time researching this, I thought I would ask in here, since there is a ton or two of knowledge here. BTW, the car is a 1988.
Thanks in advance for any help.
[This message has been edited by eti engineer (edited 06-15-2021).]
Since your engine is an '88, you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt where you can access it for replacement from the top rather than having to get under the car to do it. Not sure what that says about what GM thought of their oil pressure senders...
The second photo is the location for the coolant temp sensor, but it should be on the rear head on the driver's side... so they put the heads on the "wrong" bank. Just swap the plug from the "rear" head to the "front" head.... use teflon tape to seal the threads.
Are you re-doing the wiring? There's also a three wire CTS that can drive your dash gauge as well. That means you only need one sensor instead of two and your gauge and computer are reading from the same point on the engine.
[This message has been edited by Will (edited 06-15-2021).]
Since your engine is an '88, you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt where you can access it for replacement from the top rather than having to get under the car to do it.
Will, was it just the earlier years then where relocation of the oil pressure sender was based on whether or not the car had A/C?
OP sender... See my Cave, Oil Sensor for TSB covering this. Basically Use standard ⅛" and ¼" pipe fitting to move it so rain etc can get to the plug. Mertipack plugs are better the most but seals will let water in when constantly get soaked.
other likely part of heater loop. See my Cave, Heater I have little data for 88 V6 so don't know if uses meter output port. Should be an output to heater core. Standard metal hose barb w/ pipe threads on other side would works but soften shape edges on the barb side or can cut thru the rubber hose.
But Note If heater flows too much coolant... can cause radiator and t-stant "problems." IF has to restrict flow, pull the barb and braise a washer in the barb. Solder may fail over time because big heat cycles can crack many solders.
OE T-stat can be a "problem" too even w/o that. See my Cave, Thermostat
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
other likely part of heater loop. See my Cave, Heater I have little data for 88 V6 so don't know if uses meter output port. Should be an output to heater core. Standard metal hose barb w/ pipe threads on other side would works but soften shape edges on the barb side or can cut thru the rubber hose.
But Note If heater flows too much coolant... can cause radiator and t-stant "problems." IF has to restrict flow, pull the barb and braise a washer in the barb. Solder may fail over time because big heat cycles can crack many solders.
OE T-stat can be a "problem" too even w/o that. See my Cave, Thermostat
The corner of the head is definitely the CTS. It is not the heater.
So should I just plug this opening? My car has AC. I think that when they hot tanked the block they left a few things out after rebuilding. I didn't notice that the opening by the oil filter was open until I spun the oil pump with a drill to check and see if everything was lubing as it should. Next thing I know, I had oil on the garage floor.
The corner of the head is definitely the CTS. It is not the heater.
Thanks. I thought that it was, but wasn't sure. My car is an '88 with AC, but I am not even going to re-install the compressor. I will leave the lines intact and plugged, but here in CA, with little to no humidity, there is no need for it with the T-tops off. I thought that they had put the heads on opposite sides from where they were before. I didn't see where it would matter as long as I can re-route the wiring for the temp sensor. Do you know where the fan switch is located?
Since your engine is an '88, you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt where you can access it for replacement from the top rather than having to get under the car to do it. Not sure what that says about what GM thought of their oil pressure senders...
The second photo is the location for the coolant temp sensor, but it should be on the rear head on the driver's side... so they put the heads on the "wrong" bank. Just swap the plug from the "rear" head to the "front" head.... use teflon tape to seal the threads.
Are you re-doing the wiring? There's also a three wire CTS that can drive your dash gauge as well. That means you only need one sensor instead of two and your gauge and computer are reading from the same point on the engine.
Got it. I made a mistake. I thought I was supposed to move the sensor to the other head, but it only makes sense to pull the plug from the other head and move it. DUH!!!! I sometimes need to hear things twice before I get it. Hey!!! I'm 71!!! Give me a break!!! (LOL)
Since your engine is an '88, you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt where you can access it for replacement from the top rather than having to get under the car to do it. Not sure what that says about what GM thought of their oil pressure senders...
The second photo is the location for the coolant temp sensor, but it should be on the rear head on the driver's side... so they put the heads on the "wrong" bank. Just swap the plug from the "rear" head to the "front" head.... use teflon tape to seal the threads.
Are you re-doing the wiring? There's also a three wire CTS that can drive your dash gauge as well. That means you only need one sensor instead of two and your gauge and computer are reading from the same point on the engine.
Got it. I made a mistake. I thought I was supposed to move the sensor to the other head, but it only makes sense to pull the plug from the other head and move it. DUH!!!! I sometimes need to hear things twice before I get it. Hey!!! I'm 71!!! Give me a break!!! (LOL) I have ordered all new sensors from the Fiero Store. They should be here in a couple of days...
So should I just plug this opening? My car has AC.
Well no... you still need to make use of that port for your oil pressure sender. It seems that you now appear to be missing the piece(s) mentioned by Will.
quote
Originally posted by Will:
you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt...
Well no... you still need to make use of that port for your oil pressure sender. It seems that you now appear to be missing the piece(s) mentioned by Will.
[QUOTE]Originally posted by Will:
you should have a tubular part that installs to that hole by the filter and puts the oil pressure sender up near the belt...
[/QUOTE]
Depending on whether OP or the shop took it out, it may be difficult to recover.
I *think* have the one that came off my '87 engine when I first did the Northstar swap. Send me a PM this weekend and I'll snag a pic.
