Help w/ rough idle and poor gas mileage

On 2004-11-19 17:44:11 -0500, Backyard Mechanic > said:

> Pepito opined in news:2004111917114875249%josephamadeusNSPAM@mindsp ringcom:
>
>> On 2004-11-19 16:21:49 -0500, Backyard Mechanic > said:
>>
>>> Pepito opined
>>>>
>>>> Thanks for the info Garth, no MIL or error codes present. If this
>>>> helps, there's also a strong gas smell coming from the exaust, clear
>>>> smoke but smelly.
>>>>
>>>
>>> you said it took a long time for the engine to warm... does it, or not?
>>>
>>>
>>> But your PROBLEM is not a manifold leak... it's PROBABLY a bad Fuel
>>> Pressure Regulator... if you disconnect the tubing (to the upper
>>> intake) from the little can attached to the fuel rail, I bet you'll
>>> find there's gas in it.
>
>
>>
>> Thanks BM, the engine takes like 2 or 3 minutes to warm up. Where is
>> the Fuel Pressure Regulator located?
>>
> On the injector fuel rail.. just forward of the upper intake, see above.
>
> Much time might have been saved if you had mentioned tha gas smell in
> the exhaust earlier... EVERY odd thing may count!

Will the Fuel Pressure Regulator cause really rough iddle besides poor
gas mileage?

Pepito

>>
>>>
>>> Thanks BM, the engine takes like 2 or 3 minutes to warm up. Where is
>>> the Fuel Pressure Regulator located?
>>>
>> On the injector fuel rail.. just forward of the upper intake, see
>> above.
>>
>> Much time might have been saved if you had mentioned tha gas smell in
>> the exhaust earlier... EVERY odd thing may count!
>
> Will the Fuel Pressure Regulator cause really rough iddle besides poor
> gas mileage?
>
>


Ummmm let's see.

Open your hood and count the bits and pieces under there.

Yet i'm telling you there's a 80% chance it's just ONE of those many bits.

What do you think

IN TRUTH, the rough idle is the FIRST INDICATOR of a bad FPR

Quick explanation.. The computer has two modes. Open loop and closed loop.

Only in closed loop does the engine measure the exhaust makeup and it only
goes into closed loop when it's at running temp and the conditions are right
for it to measure exhaust makeup.


If almost ALL of your engine running time was on th efreeway at speed you
wouldnt notice much of a drop in mileage thiogh you would still have the idle
problem.

If you're interested in how your and other modern cars work go to the library
and read Charles Probst' books.

On 2004-11-19 19:00:48 -0500, Backyard Mechanic > said:

> Pepito
>>>
>>>>
>>>> Thanks BM, the engine takes like 2 or 3 minutes to warm up. Where is
>>>> the Fuel Pressure Regulator located?
>>>>
>>> On the injector fuel rail.. just forward of the upper intake, see
>>> above.
>>> Much time might have been saved if you had mentioned tha gas smell in
>>> the exhaust earlier... EVERY odd thing may count!
>>
>> Will the Fuel Pressure Regulator cause really rough iddle besides poor
>> gas mileage?
>>
>>
>
>
> Ummmm let's see.
>
> Open your hood and count the bits and pieces under there.
>
> Yet i'm telling you there's a 80% chance it's just ONE of those many bits.
>
> What do you think
> IN TRUTH, the rough idle is the FIRST INDICATOR of a bad FPR
>
> Quick explanation.. The computer has two modes. Open loop and closed loop.
>
> Only in closed loop does the engine measure the exhaust makeup and it
> only goes into closed loop when it's at running temp and the conditions
> are right for it to measure exhaust makeup.
>
>
> If almost ALL of your engine running time was on th efreeway at speed
> you wouldnt notice much of a drop in mileage thiogh you would still
> have the idle problem.
>
> If you're interested in how your and other modern cars work go to the
> library and read Charles Probst' books.

Thanks for the help BM and the rest of the guys, I will replace the FPR
tomorrow.

On 2004-11-20 00:10:38 -0500, Pepito > said:

> On 2004-11-19 19:00:48 -0500, Backyard Mechanic > said:
>
>> Pepito
>>>>
>>>>>
>>>>> Thanks BM, the engine takes like 2 or 3 minutes to warm up. Where is
>>>>> the Fuel Pressure Regulator located?
>>>>>
>>>> On the injector fuel rail.. just forward of the upper intake, see
>>>> above.
>>>> Much time might have been saved if you had mentioned tha gas smell in
>>>> the exhaust earlier... EVERY odd thing may count!
>>>
>>> Will the Fuel Pressure Regulator cause really rough iddle besides poor
>>> gas mileage?
>>>
>>>
>>
>>
>> Ummmm let's see.
>>
>> Open your hood and count the bits and pieces under there.
>>
>> Yet i'm telling you there's a 80% chance it's just ONE of those many bits.
>>
>> What do you think
>> IN TRUTH, the rough idle is the FIRST INDICATOR of a bad FPR
>>
>> Quick explanation.. The computer has two modes. Open loop and closed loop.
>>
>> Only in closed loop does the engine measure the exhaust makeup and it
>> only goes into closed loop when it's at running temp and the conditions
>> are right for it to measure exhaust makeup.
>>
>>
>> If almost ALL of your engine running time was on th efreeway at speed
>> you wouldnt notice much of a drop in mileage thiogh you would still
>> have the idle problem.
>>
>> If you're interested in how your and other modern cars work go to the
>> library and read Charles Probst' books.
>
> Thanks for the help BM and the rest of the guys, I will replace the FPR
> tomorrow.

Update: I replaced the FPR today and still have the same rough idle,
any other ideas? replace the spark plugs maybe?