Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> billy ray wrote:
>> How long will it hold fuel pressure?
>>
>> Leaking fuel injectors will make restart difficult....... do you get
>> an initial puff of black smoke when it does start?
>>
>
> No, no black smoke on a restart. I haven't timed it, but it holds fuel
> pressure pretty well. At least 15 or 20 minutes.

It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
be shot. When you take the vac line off see if there is gas dribbling out.

--
DougW

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

DougW wrote:
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

OK, I timed it. After 4 minutes, the pressure had dropped from around
49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
add to my fun, the 96 GC does not have the fuel pressure regulator
attached to the fuel rail: it's built into the fuel pump. @#$% There's
just a direct connect fuel line going to the fuel rail.

Will a regulator fail in this intermittent way? If that's the case,
then I have to pony up the $300 plus for a new fuel pump. Sure wish I
could be sure before I make the financial plunge.

By the way, the coil I used was regular old AutoZone Duralast.

Doug B.

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

did u replace the cap and rotor too?

dougguitar@yahoo.com wrote:

> The saga continues...
>
> I've changed the spark plugs and wires, and added some fuel injector
> cleaner. I've checked the fuel pressure at the rail; it's got plenty of
> fuel pressure. Nevertheless, sometimes it will just up and stall out on
> me. It can be at idle, or at 35 mph. I can even get a quick buck or
> hesitation at 50 mph or higher. If I really give it a ton of gas, I
> might keep it running, but when I do that it usually sputters, coughs
> and chokes, acting like it's running on one or two cylinders. When it
> stalls, it rarely wants to start right back up. I have to keep trying
> and praying for several minutes. After the last episode, it set five
> separate code 43's. Yes, five of them.
>
> I also put in a brand new crankshaft position sensor. Obviously, that
> didn't do the trick, even though the old one showed considerably less
> than infinite resistance across terminals B and C (suggesting it was
> bad).
>
> I guess I'll pull the distributor cap and take a look at the rotor.
> Grrr....
>
> Doug

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >

Re: 96 Grand Cherokee Stalling
 

while it's running spray water on the coil and wires and watch for sparkage
archage

billy ray wrote:

> How long will it hold fuel pressure?
>
> Leaking fuel injectors will make restart difficult....... do you get an
> initial puff of black smoke when it does start?
>
> <dougguitar@yahoo.com> wrote in message
> news:1164576776.170319.260250@45g2000cws.googlegro ups.com...
> >
> > DougW wrote:
> >>
> >> Have you replaced the ignition coil?
> >>
> >> --
> >> DougW
> >
> > Yes. That was the first thing I tried last weekend. I replaced the
> > distributor cap just now, and still got it to stall out. This time I
> > had a fuel pressure gage with me. Right after it stalled, I hooked up
> > the gage, but saw zero pressure. Then I turned off the ignition and
> > back on, and got a full 49 psi. It started back up, ran less than a
> > minute and cut off again. This time the fuel pressure gage was still
> > reading 49 psi. I started it again, and it ran very rough for about a
> > minute, but the fuel pressure was rock steady at 49 psi.
> >
> > If not for that initial reading of zero, I'd be confident that it was
> > not the fuel pump. Naturally, I haven't been able to get it to stall
> > again while sitting in the yard. I'm really getting tired of having to
> > do this out in traffic.
> >
> > Doug B.
> >