I've been reading through the posts regarding EGR valves, and especially the one where 964pt3 left that huge post about the history and complete functionality of the EGR.
What I'm starting a new thread about, is the problems I've been having with my S10.
Some of you probably remember me as the guy who just can't seem to keep his truck running right. I'll go into a bit more detail, but first here's what I have.
1998 Chevy S10 Extended Cab
4.3 Vortec V-6
Black with stepsides
148,000 Miles on it today.
Now...in this year alone I've done the following to my truck:
Wrecked in Feb -
rear left axle,
rear left drum brake setup
couple of months after I fixed it, it died on the interstate. I replaced $300 worth of stuff on it at that point to make it run.
timing chain and gear
timing chain cover
oil pan gasket
water pump gasket
(not in that particular order)
so all that stuff is new.
the check engine light came on after driving it for about 15-20 minutes, and stayed on.
At that point, I was too tired to work on ANYTHING for awhile. I just drove it like it was.
Replaced the idler pulley a thousand or so miles after that, cause it had set in the rain and rusted the bearings.
About 2000-3000 miles after that, the truck starting losing power and mileage...just happened on the interstate one day almost all at once.
Lightly pressing the gas was fine. Pressing it all the way down would make the motor bog down quite a bit, and wouldn't exceed 3000 RPM. Pressing the pedal down anywhere inbetween would cause the motor to start jerking. I guess it was missing really bad. It was weird. If I was in Neutral, and I revved the motor up, it would start pinging really bad at anything above 3000 rpm. It would also ping if I let the rpm's slip below 500 at any time. It's never done that before.
I had Autozone check the codes, and the codes said I had the following codes:
P0101 - Mass Air Flow Sensor
P0300 - Random Cylinder Misfire
P0404 - EGR valve out of range
Catylist efficiancy below threshold ( I think this was for an oxygen sensor ).
Well, I wasn't about to start replacing stuff that I wasn't sure about, cause, at this point, I'm broke, I did go ahead and replace the Fuel filter and Spark plugs. The wires have about 10,000 miles on them, so I left em. My K&N air filter has been recharged in the past 15,000, and still looks clean.
I took it to a mechanic (kind of a back yard mechanic.) so that he could use his test equipment to try and solve the problem. He had me replace the MAP sensor, to no avail, and just this weekend, he replaced the Mass Air Flow Sensor and my coil wire. Still, nothing. He finally unplugged my EGR valve, and managed to keep it from jerking really bad, but the power loss is still there.
I forgot to mention, the truck ONLY has a problem once it's warmed up. When it's cold, I can get the rpm's up without a problem, and it runs like it should.
I'm begging for help at this point. I'm willing to replace the EGR Valve, or even put one of those restrictor plate mods on there instead, IF I can be reasonably sure that's the problem.
I've spent $1200 on this truck just this year alone, not to mention the payments, etc, etc, etc. Any help at this point would be greatly appreciated!