Engine cranks and hesitates before turning over - JeepForum.com

 
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post #1 of 5 Old 04-07-2005, 03:33 AM Thread Starter
KZOO
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Engine cranks and hesitates before turning over

Hello-

I was wondering if someone can help me out with a problem I've been experiencing for the last 4 months. I have a 2001 Cherokee Sport - 4.0 liter I6- auto trans-85,000mi.

When the engine is cold, there is a noticable lag/delay in time from when I turn the key before the engine turns over (approx 10 sec)

Once the engine does start. It runs just fine. If I shut the engine off and restart within approx 30min, it starts immediately and runs fine.

The way in which I'm addressing the problem is when the engine is cold, I'll turn the key to the run position-wait 10 sec-then crank the engine. It will start up immediately.

Why exactly is this working? By putting the key in the run position and waiting 10 sec-Is the fuel system being pressurized?

If so, do I need to replace the fuel pump?

Thanks

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post #2 of 5 Old 04-07-2005, 04:29 AM
JoBo
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Try wiggiling the the gear shift. If that helps then it's most likely the NSS. They are expensive but can be cleaned. Look in the sticky for instructions.

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post #3 of 5 Old 04-07-2005, 10:06 AM
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10 SEC!?!?!?

Never......ever heard of that...........unless you have a Diesel.


I can't even think of anything that would cause that..........it's not like anything has to charge prior to ignition, or any timers of any sort.........


You dun befubble me.........


Maybe there's some Relay that's messed up....do you have an alarm with ignition kill??

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post #4 of 5 Old 04-07-2005, 10:13 AM
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Mine does the same thing, only it feels more like its taking 10 min, while all my friends are watching me cranking. There is another thread on here addressing the problem, something about installing a fuel check valve. Because the pump is letting the fuel run back down hill/ out of the fuel line when it's been off for a while.

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post #5 of 5 Old 04-07-2005, 10:24 AM
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Quote:
Originally Posted by jeeps_r_fun
Mine does the same thing, only it feels more like its taking 10 min, while all my friends are watching me cranking. There is another thread on here addressing the problem, something about installing a fuel check valve. Because the pump is letting the fuel run back down hill/ out of the fuel line when it's been off for a while.

Sounded to me like it won't even crank over???
"When the engine is cold, there is a noticable lag/delay in time from when I turn the key before the engine turns over (approx 10 sec)"



If during this 10 sec it's cranking but not starting....there's alot of things that could cause this.

Check you fuel pressure first and foremost on the fuel rail. Alot of times the pressure valve on the fuel pump fails and allows the gas in the line to depresureize so the injectors are not primed. There's a fuel pressure regulator on the fuel rail too. Both can be check from the manual. Pressure vs time.

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