Fiero 88 GT

  • Thread starter Thread starter hawkebat
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hawkebat

:oI just bought an 88 Fiero GT the car has a high idle about 2800 and I just picked up a new coolant temp sensor I hope that when I put it in that will be the fix. If not what should I check first:confused:?

:(2nd The automatic trans just locked up for a bit the car stalled it would start right back up and when I put it in gear it would stall again had to wait for it to cool off some then I was able to drive home was the car just too hot and that messed with the lock out or could I be looking at something else??
 
The TCC (Torque Converter Control ) solenoid is sticking. This happens with age. There is a 4-pin connector on the left side towards the firewall on the trans. If you pull it it will disconnect the TCC solenoid so you can drive it without stalling. It just will not lock up the converter when going down the highway so highway mileage will drop slightly and RPM's at highway speeds will be slighty higher (around 200-300 rpm more)

To replace the TCC solenoid you need to drain the trans and remove the side cover. I recommend getting one from a GM dealership because it comes with the wiring harness attached. The aftermarket ones require you to splice the wires and sometimes the wire colors don't match correctly and you end up having to tear it apart again. Also the OEM GM versions seem to last a lot longer than the aftermarket ones.


If the coolant temp sensor is broken it will idle high. The IAC (Idle Air Control) can also affect idle. Another thing to check would be for vacuum leaks. Fiero V-6's are notorious for cracking the EGR tube that runs from the EGR (on exhaust crossover near distributor) to just under the upper plenum right behind the throttle body.
 
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:p I replaced the temp sensor disconnected the battery for 10 sec my RPMs dropped to 2200 but the dash gauge is still not working I tested the wires to the sensor and they were getting power. I am hoping the sensor is working but I have yet to hear the fan kick on I will test that tomorrow.

I will check the IAC and get a new TCC wondering what a new one costs but I guess I will have to check that tomorrow too I am really happy with car once the front wheel bearings come in I dont think I will have anything major to worry about.

I will post pics on cardomain as soon as I remember my password lol on opelfanopelfan :confused:

PS is 4000 rpm with the TCC cable disconnected normal for 65 mph?
 
There are 3 temp sensors.
The gauge/light is located on the trunk side head on the left side.
The ECM temp sensor (the one that affects idle) is located on the intake manifold lower section near the battery and comes out horizintally.
The Fan temp switch is just above the ECM temp sensor going vertically.

With the auto You should only be at around 2500rpm with the TCC engaged and around 2800 without it at 65mph. If you are up around 4000rpm, The trans is slipping. Could be it needs a flush and fill as the fluid may be burnt.

If the RPM's are still high, Check the IAC and also for vacuum leaks.
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I plan having the trans serviced when i get the TCC replaced. but i dont feel the car sliping when I drive it. she will shift into over drive when i hit the gas i am thinking that the tach is messed up too cause it doesnt sound as high as it reads got a race tach on my other car i may hook that one up to see but kind of lazy today :p
 
If the tach is reading high or it seems jumpy, There is a small silver can looking item hooked to the distributor with a white wire going to it. This is the tach filter. With age they start to go bad. Rodney Dickman www.rodneydickman.com sells a replacement.
 
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I changed the air filter the oil was changed before i got the car but the idiot didnt think to change the filter the thing was so rusted that i think it is the original one :mad: i dropped 500 rpm just taking it out i am going to get a new coil and see if i can move it to the fire wall (trunkside) even with the heat shield i think it will get too hot if really ran hard plus eventhou it is an MSD one it is rusty not good. I need to get my book on that motor soon it is a pain not knowing where stuff is on that motor I guess that is what I get from running 4cyl most of my life. you guys have been a lot of help and hope in the future even more so :)
 
hawkebat said:
I need to get my book on that motor soon it is a pain not knowing where stuff is on that motor
Click to expand...

You can Download the 84-88 Fiero Haynes Manual here:
http://www.fieronews.net/fusion/downloads.php?cat_id=1

Covers a lot of the basics including ignition and fuel issues and has detail schematics of wiring and such.
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