NoCat?
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
NoCat?
Ok I got my new cat in and i am waiting to gut the precats before I put everything together and back in the car. I wanted to know if its ok or if it would hurt the car to start it as it sets (without y-pipe, cat, 02 Sensor, or pretty much the whole exhaust system? I dont see it hurting anything other then it running rough without the 02 sensor, am I right? also i dont plan on driving it as is, just start it for a couple of minutes.
long story short open manifolds with no 02 sensor
long story short open manifolds with no 02 sensor
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Shouldn't hurt, but with the open exhaust and no O2 sensor, you will probably see codes for the O2 sensor and possibly a knock sensor code. It may not run real rough other having than no back pressure; the O2 sensor is just looking for heat from the exhaust so the input from it will tell the ECM to go into closed loop.
Ears may ring for a bit....
Ears may ring for a bit....
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Shouldn't hurt, but with the open exhaust and no O2 sensor, you will probably see codes for the O2 sensor and possibly a knock sensor code. It may not run real rough other having than no back pressure; the O2 sensor is just looking for heat from the exhaust so the input from it will tell the ECM to go into closed loop.
Ears may ring for a bit....
Ears may ring for a bit....
), reason I was asking is because my mother works here at nasa as a language instructor (russian) and I have meet and am friends with many austronauts and cosmanots (have no idea how thats spelled ) but anyways we invited some russian for thanksgiving and they have never been exposed to true American muscle cars so I figured if I show em I should open up the manifolds an ill tell you when that sucker fired up they took damn near 10 steps back id upload the video but its crappy quality.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Just use a coat hangar to position the oxygen sensor in the exhaust stream, and it will be representative of how it will run. Just don't get too much of the sensor in the exhaust stream, just the tip.
