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Low idle when cold

Old 04-04-2015, 10:29 AM
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Low idle when cold

My 97 idles low (5-700 rpm) when I first start it in the morning. If I put it in reverse and hit the brakes it stalls. If I wait a minute the idle goes up enough to not stall in reverse.

Problem is the idle is already set correctly. Once the engine is warmed up a bit, idle is normal 750-800 with AC on in Drive.

I've replaced the overflow valve thinking it might be an idle fuel pressure issue, but there was no change.
Lift pump was replaced a few years ago.

Is there something that is supposed to boost the idle up when cold, like the KSB?
I usually give it a little pedal when cranking to help it start instantly. If I dont, it cranks over maybe 5-6 cranks before starting, instead of 1 crank like my first gen.

What else can I check?
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Old 04-04-2015, 12:56 PM
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sounds normal to me

my old 12v as well as my current 95 idle lower for a minute or so, then they are fine... mine are manuals tho so id tinker with the fuel to get them going without stalling
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Old 04-04-2015, 08:40 PM
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Make sure you have a known clean fuel filter and more importantly, clean or replace the pre-filter screen.
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Old 04-05-2015, 12:13 PM
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Mine drives me nuts as well, Idle was set to 800 when warm in drive but idles at 400 when cold, and even worse it idles at 300 when pulling heavy loads- stalls often when on the road for a while, if I set the idle at 800 at that point it then idles at 1200 the next day its driven.
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Old 04-06-2015, 07:29 AM
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I know many others have this same problem, but that doesn't make it "normal".
I didnt buy this new, but I would be willing to bet that it didnt stall when the first owner put it in reverse.
I was hoping somebody has solved the issue.

I will clean the prefilter and see if that helps.
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