94 celica overheated now won't stay running under 1000rpms. Options

[iSMOKEtreez]

Ok I have a 1994 celica ST, with 289xxx miles. Supposedly at around the early 200xxx ish miles a engine with 150k miles was swaped in. Doesn't look like it tho.
The other day I was driving home it was about 70deg outside when it's normally been under 50deg everyday here in Missouri.
And I noticed the AC wasn't blowing as cold as it does, then she started to overheat she over heated and shut down doin 50mph lost everything, breaks, steering.
Got it home it's hard to start and now won't stay running under 1000k rpms. It has a nasty idle when she wants to stay running. And idk what it could be.

I just recently changed all this with in the last 1000miles.
Radiator, thermostat, fuel filter, spark plugs, spark wires, distributor cap and distributor spark thing. New air filter, did a radiator flush with the new used radiator in it. Also did a 3 part fuel system cleaning in it .

Any idea as to why she won't stay running?


***Edit***
I'm sure my collent went out the crack I have in the resivor because there's no cracks or leaks in the radiator.

***Edit2****
Also went from a synthetic blend to a full synthetic with in 300 miles

And I'm kinda thinking it's the head gasket.

This post has been edited by iSMOKEtreez: Feb 22, 2016 - 4:22 PM

[Bitter]

Time to change the username to iSMOKEengines. Sounds like you popped the head gasket to me, check compression.

[njccmd2002]

Lololololololol

[iSMOKEtreez]

But wouldn't she not run at all with a blown head gasket? Oil or something somewere? She still runs like she used to just a rough idle when it wants to use at 700ish.

And how would I check compression by myself?

[4-eyed-freek]

And how would I check compression by myself?
[/quote]

www.google.com
www.youtube.com

searching is a powerful tool..

[Box]

Head gasket you'll usually have coolant/oil contamination and or white sweet smelling smoke out of the exhaust. You can rent a compression checker from AutoZone and maybe Advance? If the compression checks out and there are no other signs of the head gasket I'd look into the coolant temp sensor and idle air control valve next.

[Smaay]

I wrote this for 7th gen, but its very similar

http://www.newcelica.org/forums/showthread.php?t=227280

This post has been edited by Smaay: Feb 24, 2016 - 11:07 AM

[iSMOKEtreez]

Well it's not the head gasket. Guess I need to look at the thermostat and idle air control valve? Isn't the idle air control valve by the idle screw and stuff like that?

Also what radiator resivor matches with the celica?

[Box]

It's at the base of the throttle body, it opens and closes to let air bypass the throttle plate in order to idle. Think of it as a fancy choke. Over time it gets gummed up with carbon and generally taking it out and blasting it with some intake or MAF cleaner then some Seafoam gets it working again.

[Smaay]

Idle air control will have nothing to do with an overheat. stuck thermostat would.

[Box]

A stuck thermostat will have nothing to do with erratic idle, but a gummed up IACV will.

[iSMOKEtreez]

I messed with the idle screw ornthe air screw and it runs better now. She still wants to over heat after a hour of driving but it's cause I have water in the radiator right now to see what's going on.

But it only over heats cause the waters gone. So idk. I'm thinking about taking the thermostat out and look at it. But I just replaced it with in the last 600miles. So idk.

[nics]

any DTC code?

[VavAlephVav]

Time to change the username to iSMOKEengines. Sounds like you popped the head gasket to me, check compression.

rofl


Trees you said at first it actually overheated, as in it got really hot and then it shut itself off while you were driving. Is that right?
That engine could have some serious trouble from getting that hot.

But with the ODBI you should use a paper clip to jump the pins in the data port and count the flashes to get the code that way, like Nics is saying.

This post has been edited by VavAlephVav: Feb 25, 2016 - 6:04 PM

[iSMOKEtreez]

No codes, and she's not wanting to over heat on just water with the resivor disconnected. Could there still be a code this even tho no check engine light is on?

[Smaay]

no CEL = no codes

[Box]

Actually water displaces heat better than anti-freeze despite having a lower boiling point, that's why in warmer climates you're better off running a 70% distilled water 30% anti-freeze mix. Was going to say it almost sounds like your radiator cap is bad or there's somewhere else that's depressurizing the system, but now you say it's fine?

This post has been edited by Box: Feb 26, 2016 - 3:44 PM

[iSMOKEtreez]

It's fine like it ran before. But now u mention it the radiator cap is a lil hard to find the sweet spot. I was actually thinking about buying one of those 10$ caps that have a lock thing on it to help pressurize.

[iSMOKEtreez]

She's still running decent. I droped the full syn and put a syn blend back in and she seems to run better. Like before the overheat. Well last overheat. The radiator cap didn't help she still leaks out of the cap but she's not losing much water over the days just burning them off.