i haven't gotten my corvette manual yet but i do have 84-96 haynes for now. it gives these torques?
Throttle body bolts - 8 to 14
thermostat houseing 18-23
i did them both and just found middle ground, sound o.k. or should i take them closer to the high end of the torque?

 

Doesn't matter.
Anywhere in the given range will work fine.

Larry
code5coupe

 

....but always be careful not to over-torque, as both the TB and WP housing are aluminum...

 

yeah i got the thermostat houseing back in and the throttle body too. started it up after i let dry a while, and noe leaks so far. did i hurt anything startting it with ouy haveing the TPS set with a volt meter? yeah i know if it was its kind of late now?? i have the car almost 5 days and bad weather as kept me from get this stuff back on and running. i still have to find the plug for the IAT sensor some did some thing with??? and get her ready for maryland inspection?

 

ABSOLUTELY CORRECT.

If you over-torque the throttle body bolts, you can tweak the butterflies so that they stick. This will cause an irratic idle.

If you over-torque the thermostat housing, it'll warp, leak and maybe even crack. Pep Boys, and probably other auto parts stores, sell a cast iron version of the housing for about $10.

Jake

 

guys i didn't over torque! but i could use a little info with the other stuff.
thanks!!!

 

No you didn't do any harm by starting the engine without first setting the TPS.

What are your other concerns?

Jake

 

well i can't find the plug for the IAT sensor. and now that i put everything back together i am getting a code 36, for the mass air flow?? i also have a anti-lock light that cmes on ans stays on, even whe i try to scan it for codes i don't get anytihng but a stedy light. and the caris runing worse then befroe i hooked all the vacuum lines back up. i found the deal to set the rpms at 400 with the IAC discounected, then how to set the TPS with a volt meter, when is a good time to check the timing?

 

The plug for the IAT sensor should be back near the distributor; probably on the underside of the plenum. It has two wires with a plug in connector on the end. It'll be the only connector that will fit the sensor that's on the underside of the plenum near the distributor.

First check that the MAF is plugged in. The connector is seen easiest with you standing on the passenger side of the engine; it's on the underside of the MAF. If plugged in, remove the MAF and check the very thin wires on the inside to see if one's broken. You'll need to look through the screens to see them. If one's broken you'll need a new MAF.

I'm not sure what a "deal" is. If you're referring to the torx head screw in the throttle body, then that's where you adjust the minimum airflow setting. Most find that 400 rpms is a little too low, so if you have idle problems, )engine stalling out, etc.) you may want to raise it to 500/550.

You need a digital volt meter to view and set the TPS voltage. I don't know what year your engine is. Some TPS can be adjusted, others can't.

If your TPS is the adjustable type, you'll see that it has three wires; top middle and bottom with the connector plugged in. A,B & C.

The simpliest way is to make three jumper wires, about 8" long each. Strip the insulation off all the ends. Then strip off a section of insulation at midway point between two of the wires. Those two will have to be inserted in the top and middle positions and is where you'll make your DVM connection.

Remove the TPS connector and insert on end of each wire into each TPS opening. The insert the other ends into the TPS connector BEING CAREFUL to insert the top wire from the TPS into the TOP opening in the connector, middle to middle and lower to lower. Clip you DVM leads to the two midway sections of the top and middle wire in the area you stripped.

Turn the ignition key to "ON", do not start the engine, then read the voltage. The voltage should .54 volts (plus or minus .075). Any reading between .615 and .465 is within spec. Most find .60/.61 gives better throttle response.

If an adjustment is required, loosen the two little bolts holding the TPS to the throttle body and move the TPS up to raise the voltage and down to lower it.

After setting the voltage, tighten the screws and recheck the voltage to make sure it didn't change in the tightening process. Now, reach over and slowly open the butterflies by using the throttle lever. Watch the voltage as you do this; the voltage reading should gradually rise as you open the throttle. There should be NO sudden jumps or dips in voltage. If you get any, the TPS needs replacing.

Anti-Lock problems won't set a code on earlier C4s, but since I don't know what year your engine is, . . .

Hope this helps.

Jake