91 Grand Wagoneer stalling in morning
 

My GW tends to stall unexpectedly w or w/o warning first thing in the
morning, until it is fully warmed up. I have replaced the ignition
module, with maybe a 75% improvement. It still stalls. This morning
after about 5 min of normal running it seemed to go quiet, the voltage
meter dropped, I stepped on the gas after pulling over and putting it
in neutral, the meter returned to 'normal' range and as soon as I
eased my foot off of the gas pedal, the engine quit. It would start
repeatedly but not STAY "started". After about two minutes and four or
five attempts it started and stayed running all the way to work...

It has 89k in relatively good shape, everything works, except gas
guage. Had a recent oil change at Jiffy Lube last week, which also
seemed to improve the stalling problem...

any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

That could easily be a bad connection on the main body ground. It is a
mesh cable that runs from the rear of the engine head up to the
firewall. It controls the power to the ignition module when the key is
in run.

The vehicle can still steal a ground, lots of times it's through the gas
pedal.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

mmiller wrote:
>
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

That could easily be a bad connection on the main body ground. It is a
mesh cable that runs from the rear of the engine head up to the
firewall. It controls the power to the ignition module when the key is
in run.

The vehicle can still steal a ground, lots of times it's through the gas
pedal.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

mmiller wrote:
>
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

That could easily be a bad connection on the main body ground. It is a
mesh cable that runs from the rear of the engine head up to the
firewall. It controls the power to the ignition module when the key is
in run.

The vehicle can still steal a ground, lots of times it's through the gas
pedal.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

mmiller wrote:
>
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

May also be a bad connection on the Crank Position Sensor. A friend had
similar problems that was traced back to a very dirty CPS connector, once
cleaned the problems went away.

Snow...

"mmiller" <mmiller4342@isp.com> wrote in message
news:16e378c.0412010852.740b5003@posting.google.co m...
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

May also be a bad connection on the Crank Position Sensor. A friend had
similar problems that was traced back to a very dirty CPS connector, once
cleaned the problems went away.

Snow...

"mmiller" <mmiller4342@isp.com> wrote in message
news:16e378c.0412010852.740b5003@posting.google.co m...
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

May also be a bad connection on the Crank Position Sensor. A friend had
similar problems that was traced back to a very dirty CPS connector, once
cleaned the problems went away.

Snow...

"mmiller" <mmiller4342@isp.com> wrote in message
news:16e378c.0412010852.740b5003@posting.google.co m...
> My GW tends to stall unexpectedly w or w/o warning first thing in the
> morning, until it is fully warmed up. I have replaced the ignition
> module, with maybe a 75% improvement. It still stalls. This morning
> after about 5 min of normal running it seemed to go quiet, the voltage
> meter dropped, I stepped on the gas after pulling over and putting it
> in neutral, the meter returned to 'normal' range and as soon as I
> eased my foot off of the gas pedal, the engine quit. It would start
> repeatedly but not STAY "started". After about two minutes and four or
> five attempts it started and stayed running all the way to work...
>
> It has 89k in relatively good shape, everything works, except gas
> guage. Had a recent oil change at Jiffy Lube last week, which also
> seemed to improve the stalling problem...
>
> any suggestions?

Re: 91 Grand Wagoneer stalling in morning
 

have you checked the O2 sensor?

Re: 91 Grand Wagoneer stalling in morning
 

have you checked the O2 sensor?

Re: 91 Grand Wagoneer stalling in morning
 

have you checked the O2 sensor?