After the debacle of fixing the coolant leak under the FI, I elected to bypass the thermowax as I really don't feel like I need it down here in Florida. So, I did.

Now, when I start the car, it won't run at all. It starts, rev's to about 1500rpm, and then just dies. Giving it gas doesn't help. I was very careful to re-attach all of the vacuum lines, wires, etc. and I don't have anything loose in there that I can see.

I expected it to be a bit harder to start cold, but it seems that I should be able to keep it going with the gas pedal until it warms up.

 

Coolant leak under the FI? What is the FI?

 

Fuel Injector intake manifold.

 

Sounds like a big vacuum leak to me. Sometimes the larger vacuum hoses can be overlooked like the air supply for the bac valve that runs from the air inlet duct and above upper intake manifold to bac.


[QUOTE Now, when I start the car, it won't run at all. It starts, rev's to about 1500rpm, and then just dies. [/QUOTE]

It also sounds like your cold start valve is still in the picture if the engine is able to rev to 1500 rpm's on it's own. The fast idle cam is still engaged.

 

if you had the intake manifold off, theres a very good chance thats is your vacuum leak

 

i assume you put the airflow meter back on during these tests?

funny how so many people forget that rather important piece of hardware.

 

I did replace the upper intake manifold gasket with a new one. The old one was pretty f'ed up.

Yes, the airflow meter was on.

 

Tps sensor in place and adjusted?
Throttle cable installed and adjusted?
How did you bypass the coolant feed and return?

 

usually it's something simple, like the AWS/BAC tube not put back into the intake snorkel.

 

it should stay running fine with pedal input, sounds like some kind of large vacuum leak, double check everything.

 

Another easy one to miss is the brake booster vacuum feed.

 

I 2nd checking the AFM as it causes this exact issue. Good Luck!