2002 Grand Cherokee Hard to Start
 

I've seen this message posted several times, but no concrete
resolution, so thought I'd post to see if anyone has any other ideas.

I have a 2002 JGC, which is hard to start when the engine is warm
(after a 45 minute cool down or so). It seems to start fine first
thing in the morning or when the engine is hot (shut off for only a few
minutes). When I experience the problem however, it takes between 7-15
seconds to start, and I can sometimes smell fuel outside the vehicle
(no drips anywhere).

I've had the car to a dealer who has:
- Replaced the fuel pump.
- Cleaned throttle body/valves.
- Replaced the fuel pressure regulator.
- Replaced the computer.
- Performed hours of other diagnostics.

I still have the problem. At this point, I'm assuming the pressure
test is testing OK (so maybe not injector related). Any other ideas?

Re: 2002 Grand Cherokee Hard to Start
 

Take a closer look at the fuel pump relay and the crank position sensor.
Codes won't always be set if these fail intermittently.

Re: 2002 Grand Cherokee Hard to Start
 

Take a closer look at the fuel pump relay and the crank position sensor.
Codes won't always be set if these fail intermittently.

Re: 2002 Grand Cherokee Hard to Start
 

Take a closer look at the fuel pump relay and the crank position sensor.
Codes won't always be set if these fail intermittently.

Re: 2002 Grand Cherokee Hard to Start
 

Most likely a leaking injector causing a very rich mixture, and a hard
start. I have seen them seep enough fuel to cause this problem, yet
still be within the factory 'fuel system leak down' spec.

On 13 Oct 2006 07:14:16 -0700, "Argo" <mikemcd@nbnet.nb.ca> wrote:

>I've seen this message posted several times, but no concrete
>resolution, so thought I'd post to see if anyone has any other ideas.
>
>I have a 2002 JGC, which is hard to start when the engine is warm
>(after a 45 minute cool down or so). It seems to start fine first
>thing in the morning or when the engine is hot (shut off for only a few
>minutes). When I experience the problem however, it takes between 7-15
>seconds to start, and I can sometimes smell fuel outside the vehicle
>(no drips anywhere).
>
>I've had the car to a dealer who has:
>- Replaced the fuel pump.
>- Cleaned throttle body/valves.
>- Replaced the fuel pressure regulator.
>- Replaced the computer.
>- Performed hours of other diagnostics.
>
>I still have the problem. At this point, I'm assuming the pressure
>test is testing OK (so maybe not injector related). Any other ideas?

Re: 2002 Grand Cherokee Hard to Start
 

Most likely a leaking injector causing a very rich mixture, and a hard
start. I have seen them seep enough fuel to cause this problem, yet
still be within the factory 'fuel system leak down' spec.

On 13 Oct 2006 07:14:16 -0700, "Argo" <mikemcd@nbnet.nb.ca> wrote:

>I've seen this message posted several times, but no concrete
>resolution, so thought I'd post to see if anyone has any other ideas.
>
>I have a 2002 JGC, which is hard to start when the engine is warm
>(after a 45 minute cool down or so). It seems to start fine first
>thing in the morning or when the engine is hot (shut off for only a few
>minutes). When I experience the problem however, it takes between 7-15
>seconds to start, and I can sometimes smell fuel outside the vehicle
>(no drips anywhere).
>
>I've had the car to a dealer who has:
>- Replaced the fuel pump.
>- Cleaned throttle body/valves.
>- Replaced the fuel pressure regulator.
>- Replaced the computer.
>- Performed hours of other diagnostics.
>
>I still have the problem. At this point, I'm assuming the pressure
>test is testing OK (so maybe not injector related). Any other ideas?

Re: 2002 Grand Cherokee Hard to Start
 

Most likely a leaking injector causing a very rich mixture, and a hard
start. I have seen them seep enough fuel to cause this problem, yet
still be within the factory 'fuel system leak down' spec.

On 13 Oct 2006 07:14:16 -0700, "Argo" <mikemcd@nbnet.nb.ca> wrote:

>I've seen this message posted several times, but no concrete
>resolution, so thought I'd post to see if anyone has any other ideas.
>
>I have a 2002 JGC, which is hard to start when the engine is warm
>(after a 45 minute cool down or so). It seems to start fine first
>thing in the morning or when the engine is hot (shut off for only a few
>minutes). When I experience the problem however, it takes between 7-15
>seconds to start, and I can sometimes smell fuel outside the vehicle
>(no drips anywhere).
>
>I've had the car to a dealer who has:
>- Replaced the fuel pump.
>- Cleaned throttle body/valves.
>- Replaced the fuel pressure regulator.
>- Replaced the computer.
>- Performed hours of other diagnostics.
>
>I still have the problem. At this point, I'm assuming the pressure
>test is testing OK (so maybe not injector related). Any other ideas?

Re: 2002 Grand Cherokee Hard to Start
 

Over the last week, the dealer has:
- Tested the injection system.
- Tested a bunch of sensors.
- Checked all the grounds, battery, etc.

They suspected it could be carbon build up and suggested having the
valves cleaned/replaced if necessary. A compression test showed 1
cylinder down in the 120 range, so the valve job is uderway. Ugh.

Re: 2002 Grand Cherokee Hard to Start
 

Over the last week, the dealer has:
- Tested the injection system.
- Tested a bunch of sensors.
- Checked all the grounds, battery, etc.

They suspected it could be carbon build up and suggested having the
valves cleaned/replaced if necessary. A compression test showed 1
cylinder down in the 120 range, so the valve job is uderway. Ugh.

Re: 2002 Grand Cherokee Hard to Start
 

Over the last week, the dealer has:
- Tested the injection system.
- Tested a bunch of sensors.
- Checked all the grounds, battery, etc.

They suspected it could be carbon build up and suggested having the
valves cleaned/replaced if necessary. A compression test showed 1
cylinder down in the 120 range, so the valve job is uderway. Ugh.