Re: Exhaust changes causes problems
 

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.:worship:

Re: Exhaust changes causes problems
 

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

http://www.bcvettes.org/

Look under "How To"

Good luck

Scott

Re: Exhaust changes causes problems
 

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.

Re: Exhaust changes causes problems
 

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.

Re: Exhaust changes causes problems
 

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.

Re: Exhaust changes causes problems
 

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.

Re: Exhaust changes causes problems
 

Jeff,

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

Re: Exhaust changes causes problems
 

Sounds a lot like my Z.

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

Re: Exhaust changes causes problems
 

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? :icon_scra

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.

Re: Exhaust changes causes problems
 

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? :icon_scra

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.