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Low Idle Speed
Topic Started: May 13 2014, 09:40 PM (513 Views)
Clown Car
New Member
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It starts and runs fine but the idle is down from normal. Fuel economy same as ever. I experienced the dirty ground issue when it quit running due to no fuel being injected. Grounds are clean. All the vacuum lines are good and routed according to my factory service manual. Cannot find leaks using carb cleaner anywhere on intake system. Once warmed up it idles low. Roll up to a stop and it settles down in a second or two below the normal speed it always had. Now if I give it any electrical load, blower motor, DRL's, parking lamps it bumps the idle up ? This makes me suspect it's an electrical issue. I cannot find the cause ? Anyone else have this same issue ? Cosistent idle, just below normal. I've no tach but if 850 was normal this is more like 700 rpm's ? Thanks for any help.
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Memphis metro


Electrical load is supposed to cause the idle to raise to compensate for the load. That is normal. Do a engine compression test.
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Clown Car
New Member
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The idle is too low untill I give it a load. With the load I'd say it's still too low, under 800 ? The compression is 195 lbs across all three so the mechanicals are sound.
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bkgeig
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Until the engine is warm the fast idle air valve in the throttle body lets in more air to raise idle. I suspect there might be some kind of restriction in the intake. Less air = less fuel = lower idle. Have you tried replacing the air filter or even running the engine briefly without the filter on at all to see if the problem persists?
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yiffzer
Forgot His Manpurse

When you rev up the throttle repeatedly and let it alone, does idle rise a bit or does it quickly return to 700 RPM?

Vacuum leaks would only increase idle. You seem to have a completely closed system.
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truckjohn


When I had a bad, low speed idle....
I sorted through several things till I finally got it....
The final thing that really fixed it was replacing the TPS....

You hear folks say "Oh... They never fail"....
Mine did....

But.. I also found....
Bad thermostat
Bad engine temperature sensor
Missing evap solenoid
Bad EGR modulator thingey
Clogged up EGR passages

Thanks
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