Exhaust changes causes problems

[rogerzr1]

Originally Posted by A26B

Roger,

Data indicates the problem is probably not with the fuel pumps.

Few questions:
1. Did you ever change the fuel filter?
2. Did you ever experience any of these symptoms, before installing the new exhaust system?
3. Have you pulled the stored codes?
4. Are you getting any warning lights on the display?

1. The fuel filter was changed back in August.
2. There were a couple of times that the car did hesitate, but I just thought it was the nature of the beast. One thing I thought of is that the car is more prone to act up if there is another person in the car with me. I can't imagine another 180lbs would cause any problems. Just trying to give all the info I have.
3. I don't have a scan tool.
4. I have not had any lights come on except the service ride control. It comes on if I let the car idle for a while, but goes away when I start driving.

I am going to show my extreme ignorance now - I paid close attention when I started the car the last time. There was a vacume type sound and I felt a lot of air under the left coolant conector. After a couple of minutes the sound went away and the air flow did too. This is probably normal and I should know it, but I just thought I would mention it.

Again, let me thank all of you who are trying to help. I really appreciate it.

[Scottys72]

Hi Roger - I found this link for removing the plenum in another post:

http://www.bcvettes.org/

Look under "How To"

Good luck

Scott

Originally Posted by rogerzr1

I am going to show my extreme ignorance now - I paid close attention when I started the car the last time. There was a vacume type sound and I felt a lot of air under the left coolant conector. After a couple of minutes the sound went away and the air flow did too. This is probably normal and I should know it, but I just thought I would mention it.

Again, let me thank all of you who are trying to help. I really appreciate it.

The vacuum noise is the air injection system. I would not expect you to be feeling any air other than what is coming off the serp belt system and power steering pulley right in that area.

[rogerzr1]

Originally Posted by Jeffvette

The vacuum noise is the air injection system. I would not expect you to be feeling any air other than what is coming off the serp belt system and power steering pulley right in that area.

If the air I was feeling is coming from the serp belt or power steering pulley would it go away after a couple of minutes or would it be there the whole time the engine is on?

It is a very noticable amount of air flow.

[rogerzr1]

Originally Posted by Scottys72

Hi Roger - I found this link for removing the plenum in another post:

http://www.bcvettes.org/

Look under "How To"

Good luck

Scott

Thanks Scott. I looked it over. I don't feel quite as scared as I was before. I think with a step by step guide I can pull it off. The only problem is I don't really know what I am looking for under the plenum.

I drove the car this evening and actually had it backfire on me. I drove it around for a while to let it warm up and it drove fine. After it warmed up I gave it a few WOT. A couple of times it drove great. One time it backfired in 1st at 5500 rpms, then drove like it was turbocharged through 3rd. I am so confused.

Originally Posted by rogerzr1

If the air I was feeling is coming from the serp belt or power steering pulley would it go away after a couple of minutes or would it be there the whole time the engine is on?

It is a very noticable amount of air flow.

It should not go away if it's coming from the belt and pulley. I'll give you a call in a few mintures Roger.

[rogerzr1]

Originally Posted by Jeffvette

It should not go away if it's coming from the belt and pulley. I'll give you a call in a few mintures Roger.

Jeff,

Please give me a call when you get a chance. Do you still have my number?

[Polo-1]

Sounds a lot like my Z.

Replace the 02 sensors. Easy and cheap to do. Also check the TPS with VOM.

[rogerzr1]

Originally Posted by Polo-1

Sounds a lot like my Z.

Replace the 02 sensors. Easy and cheap to do. Also check the TPS with VOM.

My Helms manual should be here next week. I hope it will describe how to do what you have suggested.

I plan on taking the plenum off and will more than likely change the plugs and the plug wires. I have a set of the AC Delco plug wires. Should I go with the NGK plugs?

Another question: Any chance my ECM is the problem. Seems like I read before that a couple of guys had a simular problem that replacing the ECM fixed.

[rogerzr1]

Originally Posted by Polo-1

Sounds a lot like my Z.

Replace the 02 sensors. Easy and cheap to do. Also check the TPS with VOM.

My Helms manual should be here next week. I hope it will describe how to do what you have suggested.

I plan on taking the plenum off and will more than likely change the plugs and the plug wires. I have a set of the AC Delco plug wires. Should I go with the NGK plugs?

Another question: Any chance my ECM is the problem. Seems like I read before that a couple of guys had a simular problem that replacing the ECM fixed.