Re: 96 Grand Cherokee Stalling
 

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.

Doug B.

Re: 96 Grand Cherokee Stalling
 

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.

Doug B.

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> 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.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> 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.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar wrote:
> DougW wrote:
>>
>> Have you replaced the ignition coil?

> 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.

Your fuel pressure is good, possibly even a bit on the high side. How's the hose look that connects the intake rail to the pressure
regulator at the front of the fuel rail? Measure the pressure then take that hose off and see if it goes up.
It should go up a few psi.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> Outatime wrote:
>> It doesn't sound like fuel delivery is the problem, especially if it
>> will not restart immediately. Translate a code 43 for me: it doesn't
>> sound like the OBD that I am accustomed to.

96 is OBDII

>> Regardless of what code it is throwing, basic ignition continuity
>> should be checked. Intermittant problems are difficult to diagnose
>> and are labor intensive. Wiggle testing might be your next
>> assignment.
>
> According the engine code chart on Doug Wilson's excellent web page, a
> code 43 can be either of the following:
>
> 43 Peak primary circuit current not achieved with maximum dwell time.
(it's going to be this one)

This is telling me the coil circuit is having problems. It could be the connector, the engine ground, or the coil. The only other
thing it can be is the computer. That's not likely. What coil did you use?

When I was having problems in my 93 I found out the napa part with harness was needed. This was the same coil Jeep installed to
solve an earlier idle problem. The harness has an internal resistor.

The coil gets 12v from the ASD relay, make sure it's pins are clean. Actually you might swap that relay with the AC or Fog relay
just to make sure.



--
DougW

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
 

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