97 Sl2 Mis-fire Under Load

I have a 97 sl2 with 127k on it and under a load it mis-fire i check
fuel pressure it's 36-42 from idle and when brake torqued. I also
replace wires ,fuel filter and pcv . my next guess is fuel injectors
because i think it's fuel related because all coil pack are firing ok.
also has engine lite on for egr and cat-converter. i replace egr with
two use ones with no difference,


--
forty
------------------------------------------------------------------------
forty's Profile: http://www.autostalk.com/m48
View this thread: http://www.autostalk.com/t393656

On Thu, 30 Nov 2006 17:45:31 -0600, forty
> wrote:

>
>I have a 97 sl2 with 127k on it and under a load it mis-fire i check
>fuel pressure it's 36-42 from idle and when brake torqued. I also
>replace wires ,fuel filter and pcv . my next guess is fuel injectors
>because i think it's fuel related because all coil pack are firing ok.
>also has engine lite on for egr and cat-converter. i replace egr with
>two use ones with no difference,


Have you tried a OBD2 port code scan???
-----------------
TheSnoMan.com

In article >, forty.2i4120
@no-mx.forums.yourdomain.com.au says...
>
> I have a 97 sl2 with 127k on it and under a load it mis-fires. i check
> fuel pressure it's 36-42 from idle and when brake torqued. I also
> replace wires, fuel filter and pcv. my next guess is fuel injectors
> because i think it's fuel related because all coil pack are firing ok.
> also has engine lite on for egr and cat-converter. i replace egr with
> two use ones with no difference,
>
>
> --
> forty

Operating Pressure should be 40-55 psi.

Wires should be below 12,000 ohms. Are they?

What plugs did you use?

Do you have egr and converter codes?

Had the same issue. went the same route with troubleshooting. Turned
out is was a broken intake manifold gasket.

Paul

forty wrote:
> I have a 97 sl2 with 127k on it and under a load it mis-fire i check
> fuel pressure it's 36-42 from idle and when brake torqued. I also
> replace wires ,fuel filter and pcv . my next guess is fuel injectors
> because i think it's fuel related because all coil pack are firing ok.
> also has engine lite on for egr and cat-converter. i replace egr with
> two use ones with no difference,
>
>
> --
> forty
> ------------------------------------------------------------------------
> forty's Profile: http://www.autostalk.com/m48
> View this thread: http://www.autostalk.com/t393656

> my next guess is fuel injectors

Doh! Before your guessing costs you even more money and still doesn't fix
the problem, please consider either having the codes read and/or getting a
diagnostic performed at your local Saturn dealer. If it saves you from
having to replace ONE part that you don't need to, it has paid for itself.

Lane [ lane (at) evilplastic.com ]
---
Visit my Saturn Car Audio and Performance Page at http://www.evilplastic.com


"forty" > wrote in message
...
>
> I have a 97 sl2 with 127k on it and under a load it mis-fire i check
> fuel pressure it's 36-42 from idle and when brake torqued. I also
> replace wires ,fuel filter and pcv . my next guess is fuel injectors
> because i think it's fuel related because all coil pack are firing ok.
> also has engine lite on for egr and cat-converter. i replace egr with
> two use ones with no difference,
>
>
> --
> forty
> ------------------------------------------------------------------------
> forty's Profile: http://www.autostalk.com/m48
> View this thread: http://www.autostalk.com/t393656
>

I had gone through all the ECM codes. All it would say is misfire
cylinder #1.
Lane wrote:
> > my next guess is fuel injectors
>
> Doh! Before your guessing costs you even more money and still doesn't fix
> the problem, please consider either having the codes read and/or getting a
> diagnostic performed at your local Saturn dealer. If it saves you from
> having to replace ONE part that you don't need to, it has paid for itself.
>
> Lane [ lane (at) evilplastic.com ]
> ---
> Visit my Saturn Car Audio and Performance Page at http://www.evilplastic.com
>
>
> "forty" > wrote in message
> ...
> >
> > I have a 97 sl2 with 127k on it and under a load it mis-fire i check
> > fuel pressure it's 36-42 from idle and when brake torqued. I also
> > replace wires ,fuel filter and pcv . my next guess is fuel injectors
> > because i think it's fuel related because all coil pack are firing ok.
> > also has engine lite on for egr and cat-converter. i replace egr with
> > two use ones with no difference,
> >
> >
> > --
> > forty
> > ------------------------------------------------------------------------
> > forty's Profile: http://www.autostalk.com/m48
> > View this thread: http://www.autostalk.com/t393656
> >

In article .com>, "Paul" > wrote:
>I had gone through all the ECM codes. All it would say is misfire
>cylinder #1.

Have you checked #1 spark plug?

>Lane wrote:
>> > my next guess is fuel injectors
>>
>> Doh! Before your guessing costs you even more money and still doesn't fix
>> the problem, please consider either having the codes read and/or getting a
>> diagnostic performed at your local Saturn dealer. If it saves you from
>> having to replace ONE part that you don't need to, it has paid for itself.
>>
>> Lane [ lane (at) evilplastic.com ]
>> ---
>> Visit my Saturn Car Audio and Performance Page at http://www.evilplastic.com
>>
>>
>> "forty" > wrote in message
>> ...
>> >
>> > I have a 97 sl2 with 127k on it and under a load it mis-fire i check
>> > fuel pressure it's 36-42 from idle and when brake torqued. I also
>> > replace wires ,fuel filter and pcv . my next guess is fuel injectors
>> > because i think it's fuel related because all coil pack are firing ok.
>> > also has engine lite on for egr and cat-converter. i replace egr with
>> > two use ones with no difference,
>> >
>> >
>> > --
>> > forty
>> > ------------------------------------------------------------------------
>> > forty's Profile: http://www.autostalk.com/m48
>> > View this thread: http://www.autostalk.com/t393656
>> >
>

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.