post #1 of Old 08-22-2005, 11:41 AM Thread Starter
Alfons
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Startup RPM

When I first start my '91 YJ it runs at about 1200 - 1400 rpm for a few seconds and then settles on a normal idle. I've heard of the same problem on jeeps with carbs, so it can't be the injection system - I've thought of a couple of possibilities like the throttle position sensor and the idle step motor. Any suggestions?

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post #2 of Old 08-22-2005, 11:43 AM
Why J?
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mine has always done that i thought it was normal operation.
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post #3 of Old 08-22-2005, 11:49 AM
atomicmoose
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that actually seems normal to me. Do you pump the pedal before starting it?

What are the engine specs on your jeep?
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post #4 of Old 08-22-2005, 12:01 PM
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mine does that every time i start it cold but after it warms up and say i make a quick stop it wont do it then.

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post #5 of Old 08-22-2005, 12:02 PM
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I would imagine that being normal, as every car I have owned did that. From my understanding it is the buildup of pressure in the fuel system. It does it on purpose for cold starts.

Could be wrong though.

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post #6 of Old 08-22-2005, 12:38 PM
that_1_guy
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Same as everyone else: Mine has always done it.

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post #7 of Old 08-22-2005, 03:39 PM Thread Starter
Alfons
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Thanks for all your input - the explanations sound logical so I guess I'll stop looking for a "fix"

Is it also normal for a 4.0 Liter Fuel Injection Engine to need several turns (4 to 6) before starting? I had thought this may have been part of the "higher startup rpm" situation, but obviously not.
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post #8 of Old 08-22-2005, 03:41 PM
zolon
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Depends. Some days my dad's I6 will start when he just taps the keys. Other days it takes a few turns.

I think it's the weather to be honest. My 4 squirrel banger is the same way.

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post #9 of Old 08-22-2005, 05:53 PM
kimvansa
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seems normal like they all said, I get this when you nearly stall on hill climb pull aways, still trying to get used to the foot rear brake thang, release clutch and accelerate all 2gether (thats 3 feet to me I still only got 2! so whats the trick?)
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post #10 of Old 08-22-2005, 05:56 PM
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Quote:
Originally Posted by kimvansa
seems normal like they all said, I get this when you nearly stall on hill climb pull aways, still trying to get used to the foot rear brake thang, release clutch and accelerate all 2gether (thats 3 feet to me I still only got 2! so whats the trick?)
b4 you all come back with its a hand release now and again i need those 3 feet!
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post #11 of Old 08-22-2005, 08:48 PM
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Mines done it ever since I swapped in the 4.0 TB.

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