Ok, The car is a 94 Z... I've got what I think is a vac leak. I've looked the car over. Found that a vac line was cracked, and that the tube that goes from the intake to the MAF sensor was cracked on the bottom side. I replaced both, and still am having issues. Ideas??? Also, is there anyway to know for sure that it is not the Opti? the car will not rev above 35k RPM.... It sounds like vacume, but I want to make sure. So anything you guys think I need to look at let me know. I've been bumming rides for 2 weeks now trying to figure it out/waiting on parts.

Thanks

Bryan.

 

there is only an electrical connection on the MAF and if you can get your opti to spin to 35,000 (35k) then your opti is bullet proof!!

Any codes thrown? Does it idle high?

 

I think he means that the elbow that connects the MAF sensor to the throttle body had a tear in it, not that there is some sort of vacuum line from the MAF sensor to the TB.

Have you scanned it for codes? That might get you started in the right direction. Not all codes turn on the SES light.

 

[QUOTE=94zgreenmachine;5763221] if you can get your opti to spin to 35,000 (35k) then your opti is bullet proof!!

Lol I meant 3,500 oops!

No I haven't had a chance...... I will though when I can. I don't have a way to currently. I have another question though. a rather simple/dumb one. But is the alternator is going/is out, would the computer shut it's self down and cause it to act like it is??? I just realized that my voltage is down to like 9........ Oh, and no, it's idling just like normal.

 

check voltage to the post on the alternator and to the battery when you have the car running, make sure you have proper voltage comming from the alternator, also check your connections.

 

Ok, alternator issue is fixed. Had it tested. It showed it was good. Put it back on car and realized I missed the plug that goes into the back of it.... oops... Now I'm showing plenty of voltage...

I still have what sounds like a vac leak.... I don't know what it is for sure. Car has started idling rough too... it'll rev to 3,000-3,500 RPM, then bog really bad. Could it be the opti? I don't know what to think. Maybe the MAF sensor? I have a parts car, I guess I cold try pulling the MAF or maybe the opti and see what it does. I need some ideas guys.

Oh, I tied to get a scanner, the guy I know that has one said his won't do anything in less I have a check engine light on- Which I don't.

 

If it will not rev above 3.5K....it sounds like you may have a clogged cat/exhaust. It will not post a SES either. Unbolt the cat from the y-pipe and see if it revs ok(I'm not sure if you can do this....can't remember how the 94's are....I do know they are single cat).

 

Ok I'll give that a try Ace. I'm also going to try a vac gauge and see what I can find out.

 

The 94 cat is welded to the Y-pipe.

 

Update:

I pulled my throttle body off. It was so carboned up, the gates wouldn't close all the way. They would come SUPER close to being closed, but not 100%. I am in the process of cleaning everything up, tomorrow I will reinstall everything if I can find a throttle body gaset. The one that was there cracked when I pulled the whole thing. I HOPE I might have found part of my problem. I find it weird that it didn't idle higher then it did, but, like I said it is a very small amount. But it definitely does need to be cleaned. Now I am really thinking the cat might be clogged..... Maybe a excuse to just ditch the whole cat

 

Having the throttle body blades open "slightly" will usually not affect anything. The idle air control will just close down a bit to reduce the amount of idle air it is supplying.

 

I think another sign of cat clog up is that the exhaust manifolds will glow red. You may be able to see it at night.

My brother's 3.8 V6 cat in his 99 Camaro got clogged....that thing had NO power above 3000 rpms.....could barely even climb a hill. I didn't think to check the exhaust manifolds at night. It didn't throw one code either....

Once changed....that thing picked up 100hp easy....no joke.

 

Well , Ace, thats exactly what my car is doing. The car will just barely make it into my shop(It's a uphill climb). It has nothing at all past 3,000RPM. I didn't notice it at first, but if I let it idle for say 1-2 maybe 3 min, it'll start idling rough. Like it's not breathing like it should be. Did your brothers car do that by chance?? Assuming it is the cat, should I just cut it out? I think there is some sensors there. Do I need to be worried about that?? I think I remember reading it'll run fine but will throw a code..... I can't recall for sure. Eitherway I'll give the manifold deal a try tonight.

 

You'll be fine. The OBDII cars have an o2 after the cat to make sure it is operating properly. Our OBDI cars don't have that.

 

Awesome. So all I need to do is cut it out and splice in a new section of tubing. I can do that!