Jeep runs better in sunny days
 

I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
in sunny days. In wet days it's lack of power.
I changed plugs, ignitions wires, cap and roters 30,000km before.
Anything I need to look into?

thank you in advance.

Herb

Re: Jeep runs better in sunny days
 

Hi Herb,
In the old days carburated cars did run better with colder air
induction leading more gases expansion, equally more power. So if your
computer could compensate for the higher pressure, like supercharging an
engine would lead to more power. You should put it on a wheel
dynamometer to see if it's in your imagination. This reminds me I once
own an '84 Ford that's barometer had failed and it would quit every time
rain was forecast.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb

Re: Jeep runs better in sunny days
 

Hi Herb,
In the old days carburated cars did run better with colder air
induction leading more gases expansion, equally more power. So if your
computer could compensate for the higher pressure, like supercharging an
engine would lead to more power. You should put it on a wheel
dynamometer to see if it's in your imagination. This reminds me I once
own an '84 Ford that's barometer had failed and it would quit every time
rain was forecast.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb

Re: Jeep runs better in sunny days
 

Hi Herb,
In the old days carburated cars did run better with colder air
induction leading more gases expansion, equally more power. So if your
computer could compensate for the higher pressure, like supercharging an
engine would lead to more power. You should put it on a wheel
dynamometer to see if it's in your imagination. This reminds me I once
own an '84 Ford that's barometer had failed and it would quit every time
rain was forecast.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb

Re: Jeep runs better in sunny days
 

30,000km's = a year of driving on average. Did your jeep feel this way last
year after you changed plugs and stuff?

Snow...
93 XJ 371,000 km's


"Herb" <haizhong_email@yahoo.com> wrote in message
news:kTQVd.41314$kz6.786562@news20.bellglobal.com. ..
>I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>power in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb
>

Re: Jeep runs better in sunny days
 

30,000km's = a year of driving on average. Did your jeep feel this way last
year after you changed plugs and stuff?

Snow...
93 XJ 371,000 km's


"Herb" <haizhong_email@yahoo.com> wrote in message
news:kTQVd.41314$kz6.786562@news20.bellglobal.com. ..
>I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>power in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb
>

Re: Jeep runs better in sunny days
 

30,000km's = a year of driving on average. Did your jeep feel this way last
year after you changed plugs and stuff?

Snow...
93 XJ 371,000 km's


"Herb" <haizhong_email@yahoo.com> wrote in message
news:kTQVd.41314$kz6.786562@news20.bellglobal.com. ..
>I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>power in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb
>

Re: Jeep runs better in sunny days
 

How is the air filter? When they get older humidity can affect the air
flow through the dust.

I don't know what plugs you used, but I have seen a pile of those
expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
engines. They last for 6 month or a year, then the engine power up and
dies. The best is a Champion in my opinion.

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

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb

Re: Jeep runs better in sunny days
 

How is the air filter? When they get older humidity can affect the air
flow through the dust.

I don't know what plugs you used, but I have seen a pile of those
expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
engines. They last for 6 month or a year, then the engine power up and
dies. The best is a Champion in my opinion.

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

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb

Re: Jeep runs better in sunny days
 

How is the air filter? When they get older humidity can affect the air
flow through the dust.

I don't know what plugs you used, but I have seen a pile of those
expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
engines. They last for 6 month or a year, then the engine power up and
dies. The best is a Champion in my opinion.

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

Herb wrote:
>
> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> in sunny days. In wet days it's lack of power.
> I changed plugs, ignitions wires, cap and roters 30,000km before.
> Anything I need to look into?
>
> thank you in advance.
>
> Herb