DerekTheGreat
Forum Regular
Yep, mine are made in China. Didn't realize that until I looked at the box after I dropped them in.
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Yep, that's correct. I glossed over that part in your first post. Opps.. I remember a video from South Main Auto where a rich condition was caused by a cracked injector and with what peeps on here say about the factory spider's poppet valve thingies (I'm not a vortec guy!) getting dirty that could be it. Could also be the plugs too. The chinesium A/C Delcos I've got seem to be ok so far. I've got about 5k on 'em now.That was my thought too, but wouldn't my negative LTFT indicate the truck is running rich and the computer is trying to correct by pulling fuel?
Trust me when I say this.... Replace your entire distributor... I've had the same problem several times since owning my 99 Yukon. And each time it starts running rough or anything remotely close to that I always drive myself crazy trying to figure out what's wrong with it. And every single damn time it's ended up being something on the distributor.. Just get a whole new one so everything on it is correct, for some reason something is causing my cap to go bad.Greetings all! New member here. Currently working on a 1998 GMC K1500 with a 5.0L. Truck was purchased by my dad in 1999 with 17,*** on the clock. I recent purchased it from him and it is currently sitting at 179,***.
Currently I am experiencing a rough idle that is driving me insane. Here are some facts on the situation.
-60K on a rebuilt 5.0L
-New plug wires
-New cap/rotor, but Dist. is suspect, due to a broken ear and oversized machine screw installed. Although it idled fine for many miles with this set up
-No check engine light
-Pulled the plugs with 60K on them when rough idle started. Cylinders 2,4 and 7 were severely fouled. #2 was black and crusty but not wet. #4 was crusty black and tan. #7 was crusty but tan only.
-Replaced with new plugs, idle was improved, but a couple weeks later rough idle was back.
-Cleaned MAF, some improvement, but still rough.
-Ran a compression test, all cylinders were 185-195 PSI
-I have tried running with the MAF unplugged, no change in idle quality noticed.
More information regarding symptoms:
-Truck runs good when the engine is cold.
-Long term fuel trims running -10 to -12 at idle warmed up.
-Truck runs good at all speeds/RPM except idle
-The symptoms are seem to be intermittent, although it never idles perfect. Some days are better than others.
-K&N air filter, which I plan on getting rid of soon.