No fuel pressure on start up
 

I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
(more than 4 hours or so) it starts very hard. I have discovered that if I
cycle the key from off to on and let the fuel pump run and do this a few
times it starts right up.

My theory is that I lose fuel presser when it sits but from where...fuel
pressure regulator? An injector... if so which one? How do I test for this
without just starting to replace parts that may be perfectly good?

I am leaning towards it being a bad injector because sometimes when I start
it it will run rought for a few seconds. I'm thinking that one cylinder is
flooded from the injector leaking fuel into that cylinder. Again, how do I
tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless