Re: 95 ZJ Two symptoms, what's the problem?
 

A loss of power like every one is talking about is correct.
What gas did you put in it? Colorado sells 85 octane (this is their
"regular" gas), you might as well piss in the tank at altitude.

It also could be the IAC too.

--James

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0409071740.23a4b79d@posting.google.c om...
> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
> Driving from East Coast it stalled twice at idle. Driving into the
> Rocky Mountains have little power above 8000 feet. No check engine
> light, etc.
>
> Any thoughts?

Re: 95 ZJ Two symptoms, what's the problem?
 

A loss of power like every one is talking about is correct.
What gas did you put in it? Colorado sells 85 octane (this is their
"regular" gas), you might as well piss in the tank at altitude.

It also could be the IAC too.

--James

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0409071740.23a4b79d@posting.google.c om...
> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
> Driving from East Coast it stalled twice at idle. Driving into the
> Rocky Mountains have little power above 8000 feet. No check engine
> light, etc.
>
> Any thoughts?

Re: 95 ZJ Two symptoms, what's the problem?
 

A loss of power like every one is talking about is correct.
What gas did you put in it? Colorado sells 85 octane (this is their
"regular" gas), you might as well piss in the tank at altitude.

It also could be the IAC too.

--James

"Howard" <nospamets@quadnet.net> wrote in message
news:4337c03f.0409071740.23a4b79d@posting.google.c om...
> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
> Driving from East Coast it stalled twice at idle. Driving into the
> Rocky Mountains have little power above 8000 feet. No check engine
> light, etc.
>
> Any thoughts?

Re: 95 ZJ Two symptoms, what's the problem?
 

At altitude, the engine does not need as much octane since the engine's
compression pressure at higher altitudes is not as high as it is at lower
altitudes. This is WHY lower octanes are sold at higher altitudes.

Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/
"RocknTJ" <jetowle@cox.net> wrote in message
news:E4x%c.284946$Oi.121760@fed1read04...
>
> A loss of power like every one is talking about is correct.
> What gas did you put in it? Colorado sells 85 octane (this is their
> "regular" gas), you might as well piss in the tank at altitude.
>
> It also could be the IAC too.
>
> --James
>
> "Howard" <nospamets@quadnet.net> wrote in message
> news:4337c03f.0409071740.23a4b79d@posting.google.c om...
>> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
>> Driving from East Coast it stalled twice at idle. Driving into the
>> Rocky Mountains have little power above 8000 feet. No check engine
>> light, etc.
>>
>> Any thoughts?
>
>

Re: 95 ZJ Two symptoms, what's the problem?
 

At altitude, the engine does not need as much octane since the engine's
compression pressure at higher altitudes is not as high as it is at lower
altitudes. This is WHY lower octanes are sold at higher altitudes.

Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/
"RocknTJ" <jetowle@cox.net> wrote in message
news:E4x%c.284946$Oi.121760@fed1read04...
>
> A loss of power like every one is talking about is correct.
> What gas did you put in it? Colorado sells 85 octane (this is their
> "regular" gas), you might as well piss in the tank at altitude.
>
> It also could be the IAC too.
>
> --James
>
> "Howard" <nospamets@quadnet.net> wrote in message
> news:4337c03f.0409071740.23a4b79d@posting.google.c om...
>> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
>> Driving from East Coast it stalled twice at idle. Driving into the
>> Rocky Mountains have little power above 8000 feet. No check engine
>> light, etc.
>>
>> Any thoughts?
>
>

Re: 95 ZJ Two symptoms, what's the problem?
 

At altitude, the engine does not need as much octane since the engine's
compression pressure at higher altitudes is not as high as it is at lower
altitudes. This is WHY lower octanes are sold at higher altitudes.

Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/
"RocknTJ" <jetowle@cox.net> wrote in message
news:E4x%c.284946$Oi.121760@fed1read04...
>
> A loss of power like every one is talking about is correct.
> What gas did you put in it? Colorado sells 85 octane (this is their
> "regular" gas), you might as well piss in the tank at altitude.
>
> It also could be the IAC too.
>
> --James
>
> "Howard" <nospamets@quadnet.net> wrote in message
> news:4337c03f.0409071740.23a4b79d@posting.google.c om...
>> 1995 ZJ with 4.0 and auto, about 120,000 miles, well maintained.
>> Driving from East Coast it stalled twice at idle. Driving into the
>> Rocky Mountains have little power above 8000 feet. No check engine
>> light, etc.
>>
>> Any thoughts?
>
>

Re: 95 ZJ Two symptoms, what's the problem?
 

On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Hi Will,
> Back when I was serious drag racer in the sixties we bought engines
> cast for Colorado to gain a compression ratio running stock classes.
> This Cherokee build order eludes to the difference still in cars:
> "Emissions - High Altitude Tracking".
>

I thought that on those the "High Altitude Tracking" was mostly the
aneroid that adjusted the metering rod positions. I guess now (with
computer control and FI) that the MAF or MAP sensors wind up doing
most of the adjusting thru the computer.

--
Will Honea

Re: 95 ZJ Two symptoms, what's the problem?
 

On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Hi Will,
> Back when I was serious drag racer in the sixties we bought engines
> cast for Colorado to gain a compression ratio running stock classes.
> This Cherokee build order eludes to the difference still in cars:
> "Emissions - High Altitude Tracking".
>

I thought that on those the "High Altitude Tracking" was mostly the
aneroid that adjusted the metering rod positions. I guess now (with
computer control and FI) that the MAF or MAP sensors wind up doing
most of the adjusting thru the computer.

--
Will Honea

Re: 95 ZJ Two symptoms, what's the problem?
 

On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Hi Will,
> Back when I was serious drag racer in the sixties we bought engines
> cast for Colorado to gain a compression ratio running stock classes.
> This Cherokee build order eludes to the difference still in cars:
> "Emissions - High Altitude Tracking".
>

I thought that on those the "High Altitude Tracking" was mostly the
aneroid that adjusted the metering rod positions. I guess now (with
computer control and FI) that the MAF or MAP sensors wind up doing
most of the adjusting thru the computer.

--
Will Honea

Re: 95 ZJ Two symptoms, what's the problem?
 

Will Honea proclaimed:

> On Wed, 8 Sep 2004 03:33:54 UTC L.W.(ßill) ------ III
> <----------@cox.net> wrote:
>
>
>>Hi Will,
>> Back when I was serious drag racer in the sixties we bought engines
>>cast for Colorado to gain a compression ratio running stock classes.
>>This Cherokee build order eludes to the difference still in cars:
>>"Emissions - High Altitude Tracking".
>>
>
>
> I thought that on those the "High Altitude Tracking" was mostly the
> aneroid that adjusted the metering rod positions. I guess now (with
> computer control and FI) that the MAF or MAP sensors wind up doing
> most of the adjusting thru the computer.
>
Dunno of any vehicle these days that comes with optional "Denver
Heads"

The OP has something wrong though. I get a power loss at high
altitude such as crossing the Colorado rockies, Sonora Pass, etc
but have never had the stalling, coughing, bucking etc.