'92 Sonoma GT - Rough idle, running rich, 32, 43, 45 codes

[M1-Combat]

Hello all.

I've got a '92 Sonoma GT w/ 118K miles. The truck started running rich a while back (maybe 500 miles). I removed the EGR valve and the pintle would stick open when depressed. I sprayed brake cleaner in it and pressed the pintle down and twisted it with a torx head. After a few times it seemed to work correctly so I put it back in. That helped a LITTLE bit. I replaced the cap, rotor and wires. I couldn't really tell if that helped. I ran some fuel injector cleaner through it (Gumout) and that didn't help. I replaced the O2 sensor, that didn't help. I then got the 43 code indicating the ESC. I had just replaced the plugs (the plugs on the drivers side were all black, the ones on the passenger side were all fine...) but figured I may as well go for the ESC as well, so I replaced that just now. It seemed to run a little better, but I only took it for a quick spin just enough to warm it up a bit and check it out.

Symptoms -
Running rich (a little black smoke from the exhaust)
Seems to "misfire" from 2KRPMs (falls flat on it's face)to about 2500 RPMs.
32 and 45 codes at first.
After replacing the wires, plugs, ESC, Cap and Rotor the 43 code.

Any ideas? I think the main clues lie in the codes, the black smoke and the fact that the three plugs on the drivers side were black.

Thanks in advance .

Incase you didn't know - It's the 4.3L Vortec "W" code V6, CPI.

[Mikado14]

After changing those parts, did you disconnect the battery cables for at least 10 minutes to clear the computer?

[BlazerLT]

You CPI injection system needs replacing.

Check here for information and remove your upper plenum and look for internal washing from gas leaking out of the fuel line kit or the injector.

http://forums.s-series.org/viewtopic...pi+replacement

[M1-Combat]

I can get these parts from GMPartsDirect.com yes?

Any idea on the price of the nut kit and whatever else is needed?

[BlazerLT]

Yes,

How about checking out the prices for yourself.

[M1-Combat]

Will do captain .

I just figured if someone had recently purchased them they would be able to tell me. I was pretty busy at work...

Anyway, thanks for the help everyone.

[BlazerLT]

No problem.

Just rmember that we are busy too and shopping for others is not exactly under "help" in the dictionary.

[busa_4]

there is an auction going on right now on ebay for a vin "w" new cpi injection unit for a starting price of 235.00
might be the cheapest way to get one. here is the link. good luck!


http://cgi.ebay.com/ebaymotors/ws/eB...category=33553

[BlazerLT]

I'll do even better than that, there is a nut kit and all those CPI injectors in these listings.

http://search-desc.ebay.com/cpi-inje...chedZ2QQsotrZ2

[M1-Combat]

Thanks a lot for your help. I'll pull the upper intake off and check for washing. You guys have been an excellent help and I'll be able to get back to my KLR650 and 351C projects soner .