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Username Post: Engine want stay tuned up        (Topic#201370)
Posts: 2

Reg: 10-19-08
10-19-08 09:42 PM - Post#1545883    

1989 GMC Sierra, 5.7 liter. Recently tuned up, but after two weeks, it's running sluggish again. Replace distributor, rotor button, plugs and wires, fuel filter and knock sensor. I noticed that after a weather change, where it got cooler, the engine ran better, but after it got hotter, all on the same day, the engines efficiency nose dived. Any suggestions?

89 GMC Sierra 307,000 miles
01 2500 HD


"16th Year" Gold Supporting Member
Posts: 2895
Age: 60
Loc: Moore, OK
Reg: 02-20-02
10-25-08 10:37 PM - Post#1550068    
    In response to tone357

Wow, 2 newbies in a row. Same answer, try the 88-98 Trucks forum. The moderator is pretty sharp on these trucks. Welcome to CT!


'98 GMC shortwide

Valued Contributor
Posts: 4008
Reg: 05-22-05
10-26-08 06:32 PM - Post#1550562    
    In response to sedandelivery55

When I had an engine that wouldn't hold a tune, it turned out that the cam was entering the afterlife. As the lobes wore down, the tuning would get farther off.

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