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Old 11-23-2004, 03:42 PM
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Too long of a cold idle

I bought a '91 chevy p/u c/k 1500 about three years ago and I have been agravated by the what seems like an excessive long cold idle (high rpm) even at temperatures of 50*deg.!,I have to drive approx. two and a half mi. before it warms to 160*deg then it seems the sensors are satisfied it's warmed up! The high idle is 12 to1300rpm, after 160* it is 8-900 rpm.The engine is a 5.7 350 SB,with a tbi. I have added a 1" tbi spacer,a 1/4" injector spacer and a air horn velocity stack that replaces oem.,and I eliminated the restrictive hour glass snorkle tube to air cleaner with a piece of 4" plastic drain pipe-works perfect! I have the same cold idle problem after adding those things as I did before-but with more pep! I have a hd fan clutch that's a yr. old (have Ac) I find it rediculous that by design there is COLD AIR BLOWING OVER A COLD ENG.!,At start up.,Somone else on the message board Had a good Question- why not a thermostatically magnetically controlled clutch switch?- like the a/c switch! then we wouldn't need electric fan conv.,I read where people on this site bought electric fans for $70 ,I searched jegs, summit etc. and the prices are $400- $600,by the way there is a hydraulic turbine fan setup but it's $650 -parts only,by efe co. I installed a block heater about a yr. ago and it only makes a negligable difference even parked in garage overnight., what about after work sitting outside allday?,there should be a way to keep that fan from turning till the engine is warmed up! without spending a ton of money! I'm happy to be a newbie here, I think I'm going to enjoy my membership here Thanx! ps: chevy has 116000 mi.- barely broke in! Ha! Ha!,OOPS almost forgot the thermostat is 1yr. old a stant 195* and that's what it maintains 195*-200*,bye.

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Old 11-24-2004, 04:42 PM
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sounds like you have 2 problems high idle and locking fan clutch?
for the high idle, make sure that the manifold cross over is open and the temp sensor for the computer is working if not replace it
make sure the computer has no codes, the early models some times would not turn the lite on put store a code.
as per the fan a flex fan might work (taking off the clutch)
if you get electric fans be careful you can have cooling problems if you tow anything
that comes from experience
good luck
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