1988 Chevrolet Silverado K1500 4X4 problems...?

  • Thread starter Thread starter abpumprepair
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abpumprepair

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I just bought this truck. It has 150,000 actual miles. It has been in storage for the last 5 years. When I first bought it, it ran great. Now after 900 miles, it shakes at idle, misses at idle and after idling for about 4 minutes, it smokes like crazy. Blue. Give it a little gas and it clears right up, both the idleing and the smoke. I am getting 11 mpg highway as it is. 350 TBI motor. I have changed the plugs, wires, cap and rotor but nothing different... Any suggestions would be greatly appreciated.
I did just change the fuel filter but no difference. As for the valve seals..I should correct myself.. after a few minutes it smokes like crazy but if I let it idle, the smoke all disappears after about 5-6 minutes.. It does have a "nasty" smell coming from the exhaust, kinda gives you a "head-ache" if you smell it too long.
Also I should ad that once you step on the gas, all smooths out just perfectly.. I took it to the shop to get a "engine code" read and it say's that nothing is wrong.. also, the catalitic converter has been removed because I thought it may have been clogged.
 
After setting that long I'm surprised it started!

Have the TBI checked as it sounds like it is too rich at idle.
NOTE: Fuel has changed somewhat in composition over the last 5 years!
 
The whole fuel system will be gummed up with gas varnish (the residue from the rotten gas) It normally takes a couple days of running it for all this to loosen up and start clogging everything up. Recommend you start cleaning/replacing the fuel system from end to end. Only other thing I could think of that might at least be a contributing factor is the valve seals dried out from sitting so long and are now leaking oil through, but then it should still idle okay so think most of your problem is fuel related. Also be a good idea to change at least the tranny fluid, you never know if it would get some moisture in there or something from sitting so long. Sitting for that long causes lots of little problems so don't be surprised if things like wheel bearings an such start to go also. If it was me I think I would change all the fluids in diffs, transfer case, repack the wheel bearings.......then you can eliminate annoying break downs. Good luck!
 
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