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Old 04-03-2012, 09:48 AM   #1
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Loooooong Crank Time Before Start......

My 98 TJ 4.0 takes about 4-5 seconds of turning the key to get it to turn over. It only happens when its a cold start. If I run into the store for a few minutes and get back in it starts right up....Been doing this for almost 6 months.

Any suggestions? I've cleaned and retightened the battery terminals. My thought is that it lies with the starter or something since it starts right up after its been running.

Thanks.

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Old 04-03-2012, 10:00 AM   #2
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Mine does the exact same thing. It's a 99 4.0 TJ. I've heard that it has something to do with the fuel in the lines draining out. If you turn the key to the on position and let it sit there for about 10-15 seconds, it helps quite a bit. But yes... mine does the same thing.

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Old 04-03-2012, 10:08 AM   #3
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I've got a 97 2.5 and had the same issue. I'm no expert, but I was able to diagnose the problem with this trick. (assuming your cranking doesn't sound like its hesitating) Turn the key to the point just before it cranks so all the accessories light up, wait until your jeep gets done beeping at you (My does 5 beeps) and count to 10 after that. Now try turning your jeep over to start it up. If there is any improvement, you've got a leaky gas check valve. Turning the key and waiting is allowing the car fuel pump to kick in and put gas back up in the line that drained out
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Old 04-03-2012, 10:09 AM   #4
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Mine was doing the same thing. A couple of weeks ago I ended up blowing the fuse for the fuel pump and it's been better since. Don't know if that was actually the problem or not?
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Old 04-03-2012, 10:09 AM   #5
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Mine did it, fuel pump was releasing fuel pressure back into the tank. Only fix replace fuel pump
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Old 04-03-2012, 10:10 AM   #6
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Quote:
Originally Posted by Dallas View Post
Mine does the exact same thing. It's a 99 4.0 TJ. I've heard that it has something to do with the fuel in the lines draining out. If you turn the key to the on position and let it sit there for about 10-15 seconds, it helps quite a bit. But yes... mine does the same thing.
Either the fuel pump is headed south, or the check valve that maintains pressure in the fuel lines is bad, allowing the fuel to drain back into the tank.

I'm not sure if the valve is seperate, or an internal part of the fuel pump.

Probably the latter...
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Old 04-03-2012, 10:17 AM   #7
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Put a pressure gauge on the injector rail. See if it holds pressure after shut off. The pressure will slowly drop off after a couple hours. You can lose pressure quickly if an injector is leaking or the check valve in the pump is not holding. First one will flood a cylinder, the second will make it take more time to bring pressure up for starting.
If both are OK, check for a delay in pressure rise while starting the engine after an extended shut down.
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Old 04-03-2012, 11:10 AM   #8
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Thanks. I thought it might have to do with the fuel pump and/or rail. Is the fuel pump an easy swap?
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Old 04-03-2012, 11:15 AM   #9
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Thanks. I thought it might have to do with the fuel pump and/or rail. Is the fuel pump an easy swap?
You should start with the fuel pressure regulator, it is located on top of the tank and is easier and cheaper to replace. It has the check valve built into it

Worked for me, and a lot of other people around here
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Old 04-03-2012, 11:16 AM   #10
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my 98TJ with the 2.5 started doing the long crank here recently. I treated it like a gm pickup. Turn the key to the on position for a few secs (wait till the lights go off on the dash), turn it back off, then back on again and start it. No problems. But i do believe everyone is right about it either being the fuel pump is starting to go bad or a injector or gas check valve is leaking fuel.
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Old 04-03-2012, 11:29 AM   #11
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How difficult is it to get to the check valve on top of the tank? Seems like it would be in a pretty difficult spot to reach without dropping the skid/tank together???
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Old 04-03-2012, 11:31 AM   #12
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MIne was doing the same thing, I installed a new fuel pump and has been fine since. And yes a fuel pump is fairly easy. You have to drop the tank, make sure you have as close to empty as you can get it. makes life easier.
If you have trouble putting the plastic ring back on, stick it in a pan of hot boiling water for a few minutes, it will go on much easier after that.,
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Old 04-03-2012, 11:35 AM   #13
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How difficult is it to get to the check valve on top of the tank? Seems like it would be in a pretty difficult spot to reach without dropping the skid/tank together???
Its easy once you drop the skid and tank
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Old 04-03-2012, 11:43 AM   #14
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Anyone know of a write up on this? So the pump and valve are two seperate pieces?
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Old 04-03-2012, 11:48 AM   #15
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Couldnt find a proper write-up, but its pretty obvious once you drop the tank. The hardest part is getting it popped off the tank, don't be afraid of breaking it, takes some muscle and a big flat head.

Here is some more information on the process:
http://www.wranglerforum.com/f5/repl...tor-79784.html

And yes they are 2 seperate pieces, the pump is inside the tank, the regulator is on top.

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