I am new to this forum and just recently located it. I have a 1982 with a new found problem. The car developed this problem overnight. The car surges when started, 500-1200 rpm/s and often dies on the bottom end. It has no power and rpm/s raise and then fall back down with more throttle. Not drivable and shakes/surges if driven and develops no speed. A code 44 was noted and the oxygen sensor was replaced with no diffenence, but no codes being displayed now. I checked for volts at the oxygen sensor plug and received .23-.25 . I am looking for a vacuum leak and wondering if anyone has had this issue with this crossfire engine, and welcome to any replys.

 

First of all, congrat's on your 82. Second of all, check out the cross fire injection forum. Theres ton's of info there, with expert's on the cross-fire. It could be a number of things to check, but to start in the right direction I strongly suggest that forum. I dont want to start you on a wild goose chase. It could be a vac line, setting the timing, module, sensor, etc. Join the forum, and post your problem. You can't go wrong. Good luck, and welcome.

 

Which forum would be the Crossfire forum? I have seen several other sights on the net, but some seem less traveled by owners. I was hoping someone else may have had the same issue, since i/m not getting any codes now.

 

You might have a vacuum leak, and EGR leak, or a weak fuel pump. You should also see if Bubba has been fiddling with your Throttle Bodies. They are best kept left alone as much as possible. Work around them, but try not to fiddle too much with their settings if you can avoid it.

The Crossfire Injection Vault is the CFI forum that contain a wealth of info. Register there and start asking questions. There was also a paper tech article there on the CFI and how to walkthrough the tune-up with lots of leanred knowledge added in. I made a print out of it, but never made a pdf, so I cant sent it out to anyone.

There is also a Corvette Fever online article on tuning up the CFI motor.

Usually with the CFI, it is a vacuum leak that causes the majority of issues.

Remember the CFI is only a throttle body injection set-up, so its very easy to deal with, once you learn the quirky items it has.

B...

 

http://www.crossfire.homeip.net/

 

I recently parted w/my 90K mile '84 I had for four years. It was the same basic crossfire setup as the 82. Most all idle issues I experienced were resolved by keeping the bolts tight that hold the top of the manifold on AND keeping the IAC's (idle air controllers) clean. These are basically stepper motors that meter the airflow at idle. The tips and passages get carboned up and they don't move as smoothly as they should and/or stick. Remove each from it's throttle body and clean w/fuel injector or carb cleaner. Also make sure to clean out the mounting area and passages in the throttle body too. After doing this most of my idle issues went away. Once a year I'd snug the manifold bolts and re-clean the IAC's and the engine always idled fine. But FWIW I'm also aware that the throttle linkage shafts are a wear point and at some point they have to be drilled and bushed to fix vacuum leaks which will develop there at some point.

The crossfire is really a very simple system as far as FI goes and very reliable as long as Bubba hasn't modified it. Not too many sensors and pretty easy to understand overall. Much info is available online about theory of operation. And I'd also suggest to download a copy of WinALDL. This software along with a easy to build interface cable and an old laptop will allow you to see everything that is happening in the crossfire and computer system (ECM) real time. It's a great troubleshooting aid. FWIW.

Good Luck!