Truck smog saga: chapter 2
Mark Tucker last edited by Mark Tucker
So since last weekend, after failing its smog test, the truck has had a chance to sit in the corner and think about what it's done. And now it's ready to come out and behave itself.
OK, actually, it has been waiting around for Fedex to drop off the new EGR valve and solenoid. I did a lot of reading on the subject, and decided to just replace both instead of monkeying around with testing each piece. I ordered genuine AC Delco replacements, instead of the cheaper versions, because I read some bad things about idle quality and drivability with the cheapo brands. Cost a little more, but it was still less than $100 for both parts.
Put them in last night, in the rain, after having to move the distributor cap out of the way to wriggle the old EGR out. It's wedged into the back of the intake manifold between the distributor and the (rigid unmovable) fuel lines, in one of those classic GM "you can see it but you can't get to it" spots.
I drove the truck to work today, and... damned if it isn't running a whole lot smoother! The idle shake I had gotten so used to is nearly gone; I almost thought it stalled a couple of times. And the throttle response feels better too, more linear, not so much of a stumble-then-a-jerk. So whether or not this fixes the smog problem, it was worth doing.
Taking it back for another test tomorrow morning, but this time, I'm going to drive it down the freeway a few miles and back before I go, just to make sure everything is good and hot first. Last time, I just drove there; it's about 5 miles away, and I thought it would get warm in that time, but maybe not warm enough.
Fingers crossed that it passes this time...
Shop-Teacher last edited by
@mark-tucker Good luck!
MUSASHI66 last edited by
@mark-tucker Last time - which was also the first and only time - I had smoke issues, I replaced the original spark plugs with 130k miles on them, air filter, cleaned the MAF sensor, and replaced the PCV valve, which was all very cheap, and it took no time.
Then, I dumped a bottle of seafoam in the tank, and let the car run until it was almost empty.
It passed with flying colors, way under the allowed limits.
facw last edited by
@mark-tucker Sounds like a good change. Hope it passes. Not noticing gradually developing issues is always a concern of mine. Not noticing slow changes is way too easy, especially when only regularly driving one car.
HoustonRunner last edited by
@mark-tucker Give it a good old Italian tune up on the way there....
onlytwowheels last edited by
General rule of thumb is a minimum of 20 minutes of run time before testing.