87 vette won't run good
Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
87 vette won't run good
I just hollowed out all of my cats on the car. The two up front and the one in the middle. Now when the car starts, it runs rough, you can't give it any gas without it dying. what happened to make this happen???? Please let me know what I may have done wrong?
Pro
Joined: Jul 2003
Posts: 718
Likes: 0
From: Winnebago IL
o2 sensor not hooked up right?
Sounds like the Air fuel ratio is off
Anything not connected up proper after all of this?
If so you might try clearing your PCM and let it relearn from scratch. The old cat mighta been plugged enough that the engine had to learn how to run with that setup. Now that it's free to a point, it might be so out of trim that it can't cope
Sounds like the Air fuel ratio is off
Anything not connected up proper after all of this?
If so you might try clearing your PCM and let it relearn from scratch. The old cat mighta been plugged enough that the engine had to learn how to run with that setup. Now that it's free to a point, it might be so out of trim that it can't cope
Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
on the passenger side manifold, is that a o2 sensor plug on top by the distributor? That broke when I took it off, because I had to remove the manifold because my bolts broke off. I tried to hook that little sensor back up as good as I could, but It still broke. Will that make it run bad???
Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
This is the first car I have owned. I got it from my uncle to restore and have done a good job so far, but on all my chevy trucks I hollowed out the cats and had no problem. I appreciate any help anyone can give me.
Pro
Joined: Jul 2003
Posts: 718
Likes: 0
From: Winnebago IL
on the passenger side manifold, is that a o2 sensor plug on top by the distributor? That broke when I took it off, because I had to remove the manifold because my bolts broke off. I tried to hook that little sensor back up as good as I could, but It still broke. Will that make it run bad???
Drifting
Joined: May 2004
Posts: 1,747
Likes: 0
From: Port McNicoll Ontario
Sounds like you need a factory service manual (FSM).
Once you have this you will know what and where all the sensors are.
I'm not sure what sensor is up by the distributor, the o2 sensor is in your exhaust.
o2 shouldn't effect anything before the car is warmed up but whatever it is that you broke is likely your problem.
Can you post a picture of it, describe a little better where it is on the car or tell us what colour wire(s) go to it?
Once you have this you will know what and where all the sensors are.
I'm not sure what sensor is up by the distributor, the o2 sensor is in your exhaust.
o2 shouldn't effect anything before the car is warmed up but whatever it is that you broke is likely your problem.
Can you post a picture of it, describe a little better where it is on the car or tell us what colour wire(s) go to it?
Instructor
Joined: Sep 2006
Posts: 220
Likes: 0
From: Castleton NY
it will make it run rich and you'll get hot exhaust gas if the hole isn't sealed. They are not too expensive to replace - the pipe or the sensor or both. But that may not be the problem. Undo your battery terminals for a few minutes and see what happens. If it still won't run, I'd fix that o2 break. Actually, you should fix it anyway. It's important.
Last edited by ODIVETTE; Mar 4, 2007 at 08:51 PM.
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Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
appreciate guys. I will post some pics of the sensor I broke asap. I do know that it hooks to another wire behind the distributor. It is black coming out of the manifold and hooks into a little green wire behind the distributor. It sits on that little pipe that runs off the manifold up to the intake and bolts in right there. On top is that sensor and it sits in plain site on top right next to the distributor and the fuel injector.
Drifting
Joined: May 2004
Posts: 1,747
Likes: 0
From: Port McNicoll Ontario
To post a picture go to a photo hosting site like www.photobucket.com.
Upload the pictures to that site and you can cut and paste the link on this thread.
Are you talking about the wire that goes to the sensor in the tube that is covered in foil/heat wrap?
I think that's the egr temp sensor and actually it wouldn't cause your problem.
Did you break anything else? Like an old brittle vacuum line?
Upload the pictures to that site and you can cut and paste the link on this thread.
Are you talking about the wire that goes to the sensor in the tube that is covered in foil/heat wrap?
I think that's the egr temp sensor and actually it wouldn't cause your problem.
Did you break anything else? Like an old brittle vacuum line?
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Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
That is your EGR temp switch. I removed all 3 cats with no effect other than more performance, so something else is causing your problems.
Is the SES light on when engine running ?? Is the gasket at EGR temp switch intact and sealing ??
Are your spark plug wires going to the correct plugs ??
Here is some good reading for you.
http://members.shaw.ca/corvette86/Co...0View%2086.pdf
http://members.shaw.ca/corvette86/No...it%20Check.pdf
http://members.shaw.ca/corvette86/EGR%20System.pdf
http://members.shaw.ca/corvette86/Code%2032.pdf
Is the SES light on when engine running ?? Is the gasket at EGR temp switch intact and sealing ??
Are your spark plug wires going to the correct plugs ??
Here is some good reading for you.
http://members.shaw.ca/corvette86/Co...0View%2086.pdf
http://members.shaw.ca/corvette86/No...it%20Check.pdf
http://members.shaw.ca/corvette86/EGR%20System.pdf
http://members.shaw.ca/corvette86/Code%2032.pdf
Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
when the car finally starts, it wants to idle perfect. But If I try to push on the gas at all, it tries to die and bogs a little. finally if I floor it it will rev up and then die. I am sure everything is hooked up fine. One of my bolts stripped out on the intake where the EGR tube screws back in to the intake, but surely this wouldn't cause this much trouble would it????
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
o2 sensor not hooked up right?
Sounds like the Air fuel ratio is off
Anything not connected up proper after all of this?
If so you might try clearing your PCM and let it relearn from scratch. The old cat mighta been plugged enough that the engine had to learn how to run with that setup. Now that it's free to a point, it might be so out of trim that it can't cope
Sounds like the Air fuel ratio is off
Anything not connected up proper after all of this?
If so you might try clearing your PCM and let it relearn from scratch. The old cat mighta been plugged enough that the engine had to learn how to run with that setup. Now that it's free to a point, it might be so out of trim that it can't cope
Originally Posted by CoronaL
yeah it will make it run bad!
87 rag and AGENT 86 have given the best advice so far. The pic is the EGR pipe that reintroduces exhaust gases in to the intake manifold. It should be a green wire stock.
To help diagnose this problem we as much info as possible. At what temp does it run rough? (start up to op temps) Does it start right up cold or hot? What have you done besides removing the cats? Is the service engine soon light on?
I would verify spark at all 8 cylinders (hot and cold) and ohm test the fuel injectors (hot and cold) along with checking leak down.
Drifting
Joined: May 2004
Posts: 1,747
Likes: 0
From: Port McNicoll Ontario
What else did you disconnect and reconnect when you were doing this?
Did you take any plug wires off and possibly put them back in the wrong place?
Did you disconnect your esc wire? The single wire that runs from by your distributor by your brake booster.
Did you change your timing by rotating your distributor?
Are you sure you didn't accidentally bump one of the old brittle vacuum lines?
Did you take any plug wires off and possibly put them back in the wrong place?
Did you disconnect your esc wire? The single wire that runs from by your distributor by your brake booster.
Did you change your timing by rotating your distributor?
Are you sure you didn't accidentally bump one of the old brittle vacuum lines?
Thread Starter
Instructor
Joined: Mar 2007
Posts: 233
Likes: 0
From: Red Oak Texas
where are the vaccum lines that I could have broke? Can somebody send be pic of the diagram of the spark plug wires?? I removed them and put them back in what I thought was right order. Car runs rough soon as it starts up in cold nature. Doesn't have time to get hot, it dies first. The check engine light has been on since I replaced all the injectors. also, it won't hold a charge. New battery, and it won't turn over without being jumped off another vehicle, what is that all about????
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
You need to find out why the SES light is on. Read the second link I posted and tell us what code(s) you get. Here is some info on the spark plug wiring. http://members.shaw.ca/agent86/Spark...g%20Wiring.pdf
Your battery is new(fully charged) and won't crank over the motor ??
Your battery is new(fully charged) and won't crank over the motor ??