my 1994 chevrolet s-10 blazer will idle rough if i drive it for long
distances. i can remove the egr valve, clean it , then reinstall it
and normally it fixes the problem. the other day it started idling
rough again so i went thru my routine. after reinstalling it ran well
but when i road tested it. at 50 mph it cut off and started idling
rough again. it starts easily back up again just idles rough. is this
a indication that its time to replace egr? :(
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Not really. More an indication that you have carbon build up in the
intake passages to the EGR.
First step is to go to your local GM dealer and get a can of GM Top
Bring engine to operating temperature and shut off.
Disconnect MAF sensor and intake inlet. Start engine. You will get
error code but that can be ignored for now.
Slowly pour half the bottle of cleaner into the inlet pipe while keeping
the engine from dying. You will probably see some white smoke coming out
of the exhaust which is the built-up carbon from the cylinder heads.
Now dump the remaining half bottle into the inlet pipe. This will kill
the engine (if not shut it off).
Allow the cleaner to "soak in" for about 15 minutes.
While waiting, reconnect everything disconnected above (including the
MAF sensor!) and unplug then reconnect the ECM fuse to reset the error
code set above.
Start the motor and watch lots of white smoke pour out of the exhaust.
Good-bye carbon! For obvious reasons do not do this in the garage!
Run it a little bit and then pull the EGR out. Take a piece of stiff
wire and make sure any carbon still in the intake is freed up. Now start
the engine for a couple seconds to blow the crud out of the passageway.
Clean the EGR really good and install it using a screened gasket such as
http://www.tomco-inc.com/ . Then drive with a happy face...
Pacifism - The theory that if they'd fed
NO vacuum port on a 94 EGR it is computer controlled, as are 99% of them
from 94 on.
The EGR on the 4.3 is a VERY common problem to the point that GM
recalled them for replacement and updated software for the computer to
change its opening times to TRY to keep the carbon from causing
problems. It helps but they still have problems.
"Big Al" < email@example.com> wrote in message
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