Hey guys, I'm new to the Camaro scene and having some troulbe, so I thought I'd ask here...let me give you a little timeline of the problems I'm having.

Sunday: Take the car for a drive, runs smooth, no complaints.

Monday: Car sits, never started it

Tuesday: Start the car, it idles like crap (but will still run) and I hear a loud hissing. Pop hood and find that the vacuum hose that goes from the 'T" fitting near the MAP into the intake has a tear. I buy replacement hose, install. Now the car will start, but dies immidiately! If I start it and get on the gas, it'll run roughly up to about 1700rpm and then it runs fine...but if I take my foot off the gas it dies. It has never had this problem before - even with the ripped vaccum hose it'll idle poorly but not die.

Here is what I have tried so far:

- Different hoses from T fitting to intake
- MAP
- IAT
- TPS
- ECT
- coil
- got a code 12 from the ecm, have no check engine light
- disconnected the hvac vacuum

What could be causing my car to only idle at all (and even then roughly) when a vacuum leak is introduced?

I can't keep the car running with the new hose on there, so I can't get my head under the hood to see if anything is going on that I can't hear from inside the car. Does anyone see anything that I might have overlooked? Like I said, its throwing no codes, and this happened pretty much overnight. Any help or suggestions are appreciated. I've been all over the factory service manual for this car, and I'm really not sure where to look next.

Thanks guys -

Cody
'92 B4C/1LE

 

test your injectors, fuel pressure regulator fuel filter, fuel pump and have your throttle position sensor tested...the tps sends signals to the ecm to determine how much the throttle blades are opend and spray the fuel nessesary if your tps has a dead spot then it will send inaccurate readings to the ecm causing drivability problems....if the tps turns out to be good then try this...have your buddy start the car and u spray gas from like windex bottle into the throttle body...so if it keeps running as long as your spary gas into it then the problem is most like fuel realted
hope this helps

 

Sounds alot like what my 86 bird was doing. I replaced the fuel filter and a bunch more vacuum lines and it ran much better. Much better then it was used to, 2 weeks later my fuel pump died..