Chevy Lumina 98 - 156,000 mi - 3100 V6 (automatic)

Car running hot, adding antifreeze every few days, saw water leaking @ W/P. Changed water pump & thermostat. Ran fine wk or 2, overheating again, saw water & oil mixing (w/ checked oil), bad intake gasket. Car stopped won't start. Chaged intake (manifold) gasket, head gaskets(heads not cracked or warped), oil & oil filter, and coolant. Egines noise, running rough, sounds like needs oil change still, drags a min. Before shifting gears & still running rough. Ran rough 2 days, changed shift module (f/ 95 or 96 lumina @ pull-a-part) ran little better little trouble shifting gears(engine noise) 4 days later running lot better, shifting gears better(little hesitation shifting & engine noise still) 7 days latter, idle high at start like accelarator stuck a little, drives like stuck in gear(idle high) driving or stop. Changed o2 sensors(both), spark plugs & wires, changed oil & oil filter again (notice oil was low & oil leak under car before change) also had gasket worn coming f/ tube connected to pcv valve( not the pcv) but the piece going into the top of the intake from the pcv. Made gasket w/ silicone water pump sealant. 2hrs. Start fine (idle much better) still little engine noise ( added qt. Lucas oil stabilizer @ oil change) also hasn't run hot since changing gaskets & stuff, but runnging as described. Drove after all the changes & no change still idle high (stopped & driving) still drags to shift gears ( up to 25-30mph, then again round 45-50mph) running & driving real rough (high idle, engine noise) sounds like a race car when you drive it. I'm really stumped, can you please help me?
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have the same problem?
Wednesday, September 26th, 2007 AT 2:10 AM

1 Reply

Not sure how much help I can be, but I'll offer what I can.

IS the noise a ticking from the top of the motor, or is it more of a bottom end of engine more metallic kind of noise?

HEads were shaved?

Any Check engine light? Regardless were codes checked in the computer?

Have you cleaned the IAC and EGR valves and there passageways? Throttle bores?
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Wednesday, September 26th, 2007 AT 4:59 AM

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