zedhead Posted December 19, 2010 Share Posted December 19, 2010 Been fighting a low idle speed for a while. 1998 LOBW- Engine warm, it idles at 2-300 rpm in gear, foot on brake. I've cleaned the IAC, new TPS set to .5v throttle closed. I need to clean the TB, But, I doubt that will give 400 RPM idle speed. Any idea's?? Quote Link to comment Share on other sites More sharing options...
Scoobywagon Posted December 19, 2010 Share Posted December 19, 2010 Have you plugged in a scan tool and what did it tell you about the running condition of the engine at the time? Quote Link to comment Share on other sites More sharing options...
wtdash Posted December 19, 2010 Share Posted December 19, 2010 What is the idle speed in Park (assuming this is an AT)? If it's normal could be trans/TC issues. What's the history of the engine? Did the low idle follow a major service - e.g. Head gasket, etc? Td Quote Link to comment Share on other sites More sharing options...
zedhead Posted December 19, 2010 Author Share Posted December 19, 2010 I just got done with a Head Rebuild, both heads had the valves ground, surface shaved, valve lash set. New OEM HG's. New timing belt, idlers, water pump. But this problem was occurring before the head work. And continues after. I was hoping the head rebuild would have cured the problem, but.. Quote Link to comment Share on other sites More sharing options...
wtdash Posted December 19, 2010 Share Posted December 19, 2010 ?What is the idle speed in Park (assuming this is an AT)? If it's normal could be trans/TC issues.? Quote Link to comment Share on other sites More sharing options...
zedhead Posted December 19, 2010 Author Share Posted December 19, 2010 Around 350-400 rpms in park Quote Link to comment Share on other sites More sharing options...
Scoobywagon Posted December 19, 2010 Share Posted December 19, 2010 350-400 in park is also low. Plug in a scan tool and see what fuel pressure looks like. Quote Link to comment Share on other sites More sharing options...
Jim Ma Posted March 8, 2011 Share Posted March 8, 2011 I just got done with a Head Rebuild, both heads had the valves ground, surface shaved, valve lash set. New OEM HG's. New timing belt, idlers, water pump. But this problem was occurring before the head work. And continues after. I was hoping the head rebuild would have cured the problem, but.. Check the EGR valve and check all the hoses for leaks. Check all hoses going to intake manifold for carbon block. there is a small pipe going from the EGR valve to the intake check it. Quote Link to comment Share on other sites More sharing options...
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