No power after swapping in 3400-Removed AIR

[TazMan]

I did recheck the firing order and I actually purchased rebuilt injectors for a stock 3400. Specifically for a 2003 Grand Am.

[GhostGALA1]

Did you get a chance to pull the spark plugs yet?

[TazMan]

I pulled them today. A very little bit of black on them but nothing too bad. They weren't wet with fuel or anything. They all looked about the same. After 2 hours searching the garage for my compression gauge I finally gave up and ran to autozone for another. I'll check compression tomorrow and take it from there.

[TazMan]

So, Compression....
Cylinder
#1 - 180+ #4 - 175
#2 - 171+ #5 - 185
#3 - 185 #6 - 179+

Looks like the lowest reading is only about 8% off from the highest.

[TazMan]

Never mind. I've finally gotten to the bottom of it. It felt so much like a plugged cat so I finally unbolted the down pipe just in case and took it for a ride. I turned out of the driveway and it lit up the tires half way up the block. I wasn't leaning towards the exhaust cause I replaced the whole thing already but somehow the exhaust is plugged somewhere. I'm thinking maybe for the few days I had that motor out something might have crawled up in there and died or something. It's a big relief to finally have this damn problem pinpointed. Thank you everyone for all your replies.

[Purple pit]

Good to hear you found the problem. My car may have the same problem. Like you I was blowing off the exhaust system because most of it is about six years old(Magnaflow cat and muffler) with not that many miles on them.

[TazMan]

Yeah, after what I just experienced I'd say you probably shouldn't rule it out. I bought the exhaust a little over a year ago and 3 weeks later the car went into the garage. It wasn't run again till 2 weeks ago when I got the replacement motor in. I cut out the CAT to see if I could see what was stuck in there but I found nothing. It was just clogged. I couldn't see any light through it. I tried blowing through it with my shop Vac but no air what so ever was passing through. I'm surprised the car even ran.

[Purple pit]

I'm on it and working the options. Do to major rust on the resonator flange it could end up as a full exhaust.

[1QUICKHATCH]

Good to hear that you found the problem! Was going to say to drop the exhaust but figured that it was good when you said that it was new.