Re: Big Issues with 1994 Camaro - Bad Performance!
Hi There,
I agree that the fuel pressure looks correct (at least as far as I've tested). Yes, the system was in closed loop (or as my scanner displays Loop Status: Closed). HO2S's were showing typical rapid up-down voltage fluctuations. I ran a few more scans trying to capture the problem when trying to maintain a steady throttle position (hard to do when the car bucks like it does). One funny thing I see is when I slowly advance the throttle, I see the Mass Air Flow slowly increase, The Manifold Absolute Pressure slowly increase (like they should) but the RPM's go down and then start to increase (bogging down). I also noticed that the Spark Advance curve is roughly the inverse of the Throttle Position, Manifold Absolute Pressure, Mass Air Flow curves (i.e. spark advance declines as the others incline). Is this any help? Good Luck! -Blue Chips- Webb |
Re: Big Issues with 1994 Camaro - Bad Performance!
Hi There,
I know it has been a long time and I haven't been keeping up with the progress. I just wanted to let you know that I did finally figure out the issue with my son's Camaro. It turned out to be the catalytic converter had become blocked at the inlet (where you can't see into it). The exit was clean and looked normal. I discovered it when I removed the "wye" pipe assembly and noticed a rattle inside it. I turned it so the inputs were down and some pieces of the catalyst came out (along with some dust). So, I figured the pieces have been vibrating against each other and making this dust and it was plugging the honeycomb passages in the rest of the "cat." So, I took a long chisel and broke out the rest of the honeycomb so the cat is now a resonator. This was done as a "quick check" to see if this had any effect on the problem. I re-attached the wye-pipe with disabled cat and "Nirvana!" The old girl ran like new. I have since replaced it with a Walker wye-pipe with cat. This happened shortly after my last post. Unfortunately, I have suffered a series of catastrophes that have consumed my time (like my house burning down, my mother being diagnosed with cancer and dying and then my sister dying of cancer too). So, my mind has been consumed by other thoughts and I just forgot to post my results. Please forgive me. Anyway, I figured that I would let you know that the problem is solved and you now know what the answer was. Thanks for all the help and, Good Luck! -Blue Chips- Webb |
Re: Big Issues with 1994 Camaro - Bad Performance!
Sorry to hear about your family losses and loss of your home. As a new member to this forum I had read your posts as I am interested in troubleshooting these cars and had wondered what the outcome was. I've seen other cases with similar drivability issues turn out to have clogged cats requiring replacement. Glad to hear you were able to fix the Camaro and hope all is back to normal with you life. Thanks for your update.
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