Question about 1999 Jeep Wrangler

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My '99 Wrangler Sport 4.0 straight six used to start after a couple cranks. Now it can take up to 20. I can toggle the ignition a few times without cranking the engine and it starts much quicker. This is only when cold. From other answers I have seen on this site, I think it is taking time for pressure to build in the fuel system, but why? What is happening to the pressure while the vehichle sits for several hours? I don't see any fuel leak anywhere

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You have a fuel pressure regulator that has a check valve in it. Your check valve keeps fuel from going back to the tank. When the fuel goes back to the tank then when you crank it the pressure travels back to the regulator and builds back the pressure. If you replace the fuel pressure regulator this will solve your problem!

Posted on Sep 16, 2010

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Posted on Jan 02, 2017

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My '99 Wrangler Sport used to start on the 1st couple cranks. Now it takes about 20 cranks or i can turn the key off and on a few timeswithout cranking the engine and then it will start. This is only when...


You are correct. the fuel system is loosing preasure while sitting and then it takes time for it to build back up, you will not smell the fuel because its the preasure regulator valve in the fuel pump, so it just drain back into the tank,this is common on chry,and jeeps. the preasure regulator in the pump is bad, you will need to replace the pump asm. this will solve your starting problem, hope this is helpful.

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2007 Jeep Wrangler Unlimited Sahara


SUBJECT:
Long Crank Time Due To Possible Contact Of Camshaft Sensor To Camshaft Gear
OVERVIEW:
This bulletin involves the replacement of the engine camshaft sensor.
MODELS:
2007 (JK) Wrangler
NOTE: This bulletin applies to vehicles equipped with a 3.8L engine (sales code
EGT).
SYMPTOM/CONDITION:
The customer may experience one of the following conditions:
a). Long engine crank time.
b). Two engine start attempts prior to engine starting.
c). Due to the “TIP Start Feature” on automatic transmission equipped vehicles, once the
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engaged for up to 10 seconds while the engine attempts to start.
The above conditions may be due to the position of the camshaft sensor to the camshaft
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DIAGNOSIS:
If the above condition is present perform the Repair Procedure.
PARTS REQUIRED:
Qty. Part No. Description
1 04686353 Sensor, Camshaft

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