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1989 5.8 rough idle help

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Old 10-07-2014, 09:42 PM
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1989 5.8 rough idle help
I'm not sure what's wrong but I've done plugs fuel pump , checked injectors and still rough idle . Also not much power at acceleration .
 
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Old 10-07-2014, 10:20 PM
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Try cleaning your tb and clean or replace iac valve. This should help smooth your idle. Also check the timing and fuel pressure, wouldn't hurt to do a compression check either.

Tanner
 
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Old 10-07-2014, 10:27 PM
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There are a lot of things that you haven't yet mentioned.

Wires

Rotor

Cap

Vacuum leaks, many possibilities here.

Fuel Filter

PCV Valve

How are they?
 
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Old 10-07-2014, 11:21 PM
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Fuel pressure is good , wires cap all good , fresh tune up. Timing is good as well as compression and injectors. I'll clean tb over weekend and check the iac. Thx.
 
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Old 10-12-2014, 06:24 PM
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Cleaned tv still idles rough at low rpm. (Around 600) smooth at around 900. No burnt valves. Vacuum leaks. Help
 
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Old 10-12-2014, 07:21 PM
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Did you clean the iac too? I have read that most idle problems with these trucks are caused by the iac valve.

Tanner
 
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Old 10-12-2014, 08:08 PM
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It looks new but I'll take it off and clean it tommorrow
 
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