Quote:
Originally Posted by ChevyTech
Good progress!
If plug wires are not the problem you may consider carbon build up because it was running rich. If they run cold the system is running rich.
These TBI trucks can get very heavy carbon deposits on the valves when they run cold.
I have used SEA FOAM several times with great success. I have also used GMs TOP ENGINE CLEANER at the dealership many times with good results. The GM Top Engine Cleaner smells just like SEA FOAM to me and I have wondered if they are the exact same product. I have never had any problems from using these products, but if an engine has very heavy carbon, one treatment may not get it all out. My biggest concern is that it is not poured in so fast that it liquid locks the engine.
I slowly pour in a half can in the hot engine at fast idle then stall the engine and let it sit ten minutes. Then I slowly pour in the rest of the can at a fast idle, and then go drive it.
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Changed the plugs, wires, distributor cap, rotor, and fixed a couple grounds and some other wires that looked like they'd seen better days as well. Also broke out the timing light and followed the proper procedure of unplugging the tan/black wire to check the timing. it was off a good bit, so reset it to 0 and plugged the wire back in and revved it and all and rechecked.
The plugs looked surprisingly good, driving it a week either cleaned the carbon and rich looking plugs up, or by some miracle with it running as crappy as it was 2 weeks ago the plugs stayed ok.
It runs sooo much better now, no stumbling like when I back off the gas heading to a red light and it turns green and get back on throttle, etc. it's like a new truck again now. Thank you again for the tips and help.
