stolen hot rod

Hi I recently came across a 1990 camaro rs from a buddy who was leaving for the military. Awesome condition inside and out. All original interior not one crack or tear inside. Cherry. Red interior on black. Everything under the hood seems to be there and un tampered with to the best of my knowledge. Car ran great when I bought it for 500 bucks. Check engine light would pop on when it was hot out. 80 degrees and above in stop n go traffic. Then turn off. When it comes on the car looses half of its power. Idles up and down. Dies back fires. Runs like crap. Sucks down all my fuel. Horrible combination. Since I bought it I've replaced the plugs which are ac delco r45ts plugs. An oxygen sensor and the map sensor. Now tonight I replaced the vacuum hose leading to the map sensor from the rear of the throttle body and it really helped out. Turned off the light. Or so I thought. I can drive the car for a few miles cruzin at 65 mph and all of a sudden the light will come on and all my prior symptoms will occur. Then I will park the car shut it off for ten minutes and that same thing will happen. Drive for a few miles and the light will come back on. Cars details are 90 camaro rs 5spd with a vortec 305 in it tbi. Idk what is causing this and I'm thinkin maybe the iac valve. I really don't want to hassle with the computer having to go through a re learn proccess but anything at this point is better than my car runnin like it does. Any input is greatly appreciated. Also a hose on my charcoal canister by my driver side headlight is cracked and there are 2 vacuum hoses plugged. 1 straight off the manifold into a 90 fiting and 1 off the front of the throttle body. Not sure where they go but have been since I bought it and is my doing do to funds. Thank you. My name is jake. Previous owner also informed me it could be a head gasket. Also I was looking for vacuum leaks under the hood and notice a burned oil smell. Really strong. Let me know if u have any more questions. Car has 160 some ought thousand miles on it.

vetteoz

iTrader: (13)

You are supposed to pull the error codes
https://www.thirdgen.org/forums/tech...s-dumbies.html

to see what problem the check engine light is pointing to before throwing random parts at it

stolen hot rod

I haven't been able to get ahold of a scanner.

stolen hot rod

Tonight I should be able to get one. All post the code

Tuned Performance

iTrader: (92)

you don't need a scanner, got a paper clip ?

Tuned Performance

iTrader: (92)

see vetteoz's link

stolen hot rod

Ok so scanner shows that I'm throwing code 23 and 42. What are these codes. Again thank you all for your help and God bless!

Tuned Performance

iTrader: (92)

MAT sensor diagnostics Code 23 low temp indicated, code 42 Ignition bypass circuit error.
The code 42 could be a stored code from the last time the timing was set. You should focus on trouble shooting on the code 23 first. check the connector for corrosion and check the ground for the sensor.

stolen hot rod

Its weird that whenever its pretty cold outside the car runs great. But it gets warm it throws codes

Tuned Performance

iTrader: (92)

mat sensore are cheap its the same sensor as the cts just used to measure air temp instead of coolant temp.

stolen hot rod

Ok cool so I could pick up a new sensor and ground it straight to the battery correct?

Tuned Performance

iTrader: (92)

since you stated the heads have been changed to vortecs you might want too look at the original mat ground. I believe its on a stud on the back of the passenger side head. mat reading vs temp.

stolen hot rod

How would I check that voltage. Ohms meter voltage meter. And when would I be able to check it. Car running not running hot cold?? Sorry I am not used to the newer vehicles used to carburetors and hei's. Lol

stolen hot rod

And Idk if the heads have been changed or not. I just know that they are vortec

Tuned Performance

iTrader: (92)

The L31 didn't come out until until 96 in trucks.

Tuned Performance

iTrader: (92)

stolen hot rod

Ok cool thank you

stolen hot rod

I am having trouble locating the iatc sensor on my camaro. Even more knowing what it looks like and finding a new one at the parts store. Can and will someone shed some light on my dark tunnel

afremont

That's not weird at all. Your car is reading that it is literally 40 below zero outside. Therefore it is dumping gas into the engine to go with all that super condensed air that it thinks is going in. When it really is colder outside, then things are better.

afremont

I assume you have a 3.1L VIN T engined car, is that right? The manifold air temp sensor is in the front passenger side area of the engine compartment. It appears to be installed into some kind of air intake ducting according the line drawing in my 1990 service manual. It appears to be in the vicinity of where the battery tray would be if it were on that side of the car.

EDIT: I just saw something in your original post about a Vortec 305. If that's the case, I have no idea what kind of setup you might have and what may have been changed.

That said, a low temp reading is a sign of a sensor being unplugged or having a bad ground. I believe this sensor shares a ground return with the throttle position sensor. That seems to be working for you, so the ground is probably ok. I'd say the sensor is either missing or dead.

Tuned Performance

iTrader: (92)

The mat is in the air filter housing on tbi f-body

stolen hot rod

So where to go from here

afremont

Did you find the sensor and/or the wiring harness for it? There are ways to test the sensor and wiring, but we need to know what kind of state it is all in. From someone simply snipping the harness off at some location, you'd get a low temp reading message since the sensor would be effectively unplugged.

stolen hot rod

I'm not sure but there are like four items missing becquse I am finding things unplugged and all that remains are the plugs. Now the cat is gone and idk hoow many o2 sensors this car has but I have only found one on the driver side exh manifold. But I haven't found any cut or damaged wires. Let me know how I can further help

stolen hot rod

My air charge sensor is unplugged and Idk where it goes and the auto part store only shows that sensor

Tuned Performance

iTrader: (92)

there is only one o2s. your mat goes in the air cleaner housing at the 11 clock position.

GENERAL MOTORS OE 12110320
GENERAL MOTORS OE 12160245
GENERAL MOTORS OE 213136
GENERAL MOTORS OE 25037229
GENERAL MOTORS OE 25037313
GENERAL MOTORS OE 25037357
GENERAL MOTORS OE 25168268
GENERAL MOTORS OE 25171651
acdelco 213-136
standard motor products ax34
AIRTEX ENG. MGMT. SYSTEMS 5S1011
AUTOPART INTERNATIONAL 180298616
AUTOPART INTERNATIONAL 98616
BWD AUTOMOTIVE EC435
CARQUEST 724516
CARQUEST 724562
CARQUEST AX41
DELPHI TS10020
DELPHI TS10073
DELPHI TS10097
GP SORENSEN 77919038
KEMPARTS 139209
NIEHOFF FE625
ORIGINAL ENGINE MANAGEMENT ATS13
WELLS 724516
WELLS 724562
WELLS SU1195
WELLS SU1197

stolen hot rod

Sweet I'm gonna look into getting that part. Also I think my harness on my car uis shorting out. I lost my tach today. Someone has wired. Aftermarket fan into my car. Credibility is questionable. It stayed on for a second after I turned my key off yesterday as with my heater then shut off on its own,