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#1
11-22-2007, 11:10 PM
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low rmp idle idles rough
Truck 91 chevy k1500 z71 will start good have rmps at 1000 then drops to 200 sometimes lower put it on computer got codes 32 egr valve and code 43 esc module replaced both of those still no better so replaced ignition coil and fuel pump still no different please help
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#2
11-22-2007, 11:26 PM
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Re: low rmp idle idles rough
Check for vacuum leaks near the intake manifold. Check the lines going to the brake booster, the vapor canister, the PCV system, and any intake manifold vacuum diverging line. .
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have. Last edited by maxwedge; 11-23-2007 at 08:17 PM.
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#3
11-23-2007, 08:11 PM
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Re: low rmp idle idles rough
silicon212 mentioned the PCV system. Make sure you take a look at the rubber gasket that holds the PCV into the valve cover as well. If it's loose it will cause a vacuum leak as well and an irregular idle. Changing that on my 91 years ago cleared that stumble at idle right up.
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CD 1991 W41 #142 1989 Caprice 9C1 1997 C1500 1997 Bonnie SE 1998 Olds 98 LS Recently updated: http://forums.b-body.org
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#4
11-23-2007, 08:17 PM
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Re: low rmp idle idles rough
Quote:
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#5
11-24-2007, 01:40 AM
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Re: low rmp idle idles rough
Since you had a code 32, did you also check the EGR solenoid? It should hold vacuum on TBI side. How to the vacuum lines look for EGR and EGR solenoid?
//2000CAYukon
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