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Well, I'm back, and the Bravada is running rough again.
I replaced the CPI unit and "nut kit" in July, like I mentioned, but recently the new CPI unit (GP Sorensen unit from Advance Auto) went bad. The fuel pressure regulator diaphragm went bad and was dumping raw fuel on the passenger side of the motor. I replaced the CPI unit again last week since there is a 1 year warranty on the part, but the truck is still running like it did before.
When it's first started up, it sputters and shakes. When I'm on the gas, it seems fine, but at idle speed it sputters once again and sometimes stalls. When it stalls and shuts off, it takes a LONG time to get it restarted. The computer is only spitting out 1 code, code 32 for EGR. When I replaced the CPI the second time, I removed the EGR valve and cleaned out the carbon, but the code still pops up after only a couple of minutes of driving. The EGR valve was actually replaced almost 2 years ago according to the owner.
As far as I can tell, the new CPI unit is not leaking, but the O2 sensor is still reporting that the engine is running rich. It switches from about 700 to 200 constantly when warm, but it stays rich a LOT longer than it stays lean.
Does anyone have any suggestions or advice? I'm pretty much stumped right now.
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