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Old 07-18-2005, 14:01   #1 (permalink)
GLubester
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3.8L questions

Hi everyone. Iím new here and i have a couple questions. I own a
1995 T-bird with the 3.8L. My car does lack power, but i didnt expect
a ton of power from it. But is it common for these motors to lose a
ton of power above 2500 RPMs? My car will barely accelerate from 2500
RPMs up, even in first gear. I donít know if there is a problem or
not.

Also my check engine light comes on periodically and goes back off. I
took it to Advance Auto Parts to have the codes checked out. It said
bad O2 sensor on bank 1. So i replaced the O2 sensor on the right
side of the motor (this is bank 1, right?) but the check engine light
is still on. I havenít had time to get this checked out again for new
codes. Any ideas on BOTH subjects would be greatly appreciated.

Many thanks in advance.

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Old 07-18-2005, 14:01   #2 (permalink)
C. E. White
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Re: 3.8L questions


"GLubester" <UseLinkToEmail@AutoForumz.com> wrote in message
news:1_631126_eff7da8a7bbcb2d13e859b2b4ced9bc1@autoforumz.com...
> Hi everyone. I'm new here and i have a couple questions. I own a
> 1995 T-bird with the 3.8L. My car does lack power, but i didnt expect
> a ton of power from it. But is it common for these motors to lose a
> ton of power above 2500 RPMs? My car will barely accelerate from 2500
> RPMs up, even in first gear. I don't know if there is a problem or
> not.


Any chance you have a restricted exhaust system? Years ago I had a Datsun
208Z. It got so it would not pull the redline in first gear. Even though the
outside of the muffler and pipes looked good, I was suspicious that there
was an exhaust system restriction. I disconnected the exhaust pipe at the
header and the car's former power was restored. A new exhaust system
rectified everything.


> Also my check engine light comes on periodically and goes back off. I
> took it to Advance Auto Parts to have the codes checked out. It said
> bad O2 sensor on bank 1. So i replaced the O2 sensor on the right
> side of the motor (this is bank 1, right?) but the check engine light
> is still on. I haven't had time to get this checked out again for new
> codes. Any ideas on BOTH subjects would be greatly appreciated.


If no one reset the codes, then it will take a while for the light to go off
by itself. You can disconnect the battery for about 5 minutes to reset the
light, but it will also reset all the parameters the computer has leaned. If
you are not in a hurry just give it a few days for the light to reset
itself. If the light was supposedly reset, then you should have the codes
checked again.

Regards,

Ed White


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Old 07-18-2005, 14:01   #3 (permalink)
Backyard Mechanic
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Re: 3.8L questions

Need more info... any difference, hot/cold?

When the car is accelerating does it sound like a vaccuum cleaner at the
tailpipe?

On idle, can you distinguish individual exhaust beats at tailpipe?

Long Shot, but sounds like plugged cats to me. All gas is the same,
right?!! yeah, sure. STF AWAY from little corner mom/pop store pumps!

And I'm betting that the check engine lite will turn out to be related to
DPFE when you read the code out.. (autozone)




GLubester <UseLinkToEmail@AutoForumz.com> wrote in news:1_631126
_eff7da8a7bbcb2d13e859b2b4ced9bc1@autoforumz.com:

> Hi everyone. Iím new here and i have a couple questions. I own a
> 1995 T-bird with the 3.8L. My car does lack power, but i didnt expect
> a ton of power from it. But is it common for these motors to lose a
> ton of power above 2500 RPMs? My car will barely accelerate from 2500
> RPMs up, even in first gear. I donít know if there is a problem or
> not.
>
> Also my check engine light comes on periodically and goes back off. I
> took it to Advance Auto Parts to have the codes checked out. It said
> bad O2 sensor on bank 1. So i replaced the O2 sensor on the right
> side of the motor (this is bank 1, right?) but the check engine light
> is still on. I havenít had time to get this checked out again for new
> codes. Any ideas on BOTH subjects would be greatly appreciated.
>
> Many thanks in advance.
>


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Old 07-18-2005, 23:01   #4 (permalink)
GLubester
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Posts: n/a
Re: 3.8L questions

"GLubester" wrote:
> Hi everyone. I'm new to this forum and i have a couple
> questions. I own a 1995 T-bird with the 3.8L. My car does
> lack power, but i didnt expect a ton of power from it. But is
> it common for these motors to lose a ton of power above 2500
> RPMs? My car will barely accelerate from 2500 RPMs up, even
> in first gear. I don't know if there is a problem or not.
>
> Also my check engine light comes on periodically and goes back
> off. I took it to Advance Auto Parts to have the codes
> checked out. It said bad O2 sensor on bank 1. So i replaced
> the O2 sensor on the right side of the motor (this is bank 1,
> right?) but the check engine light is still on. I haven't had
> time to get this checked out again for new codes. Any ideas
> on BOTH subjects would be greatly appreciated.
>
> Many thanks in advance.


I just got back from Advanced Auto Parts to get the new codes read. 3
codes showed up:

181-Adaptive Fuel rich limit reached at part throttle, system lean,
right side
186-Injector Pulse-width higher than expected
189-Adaptive Fuel rich limit reached at part throttle, system lean,
left side

This pretty much explains why my car doesnt have any power above 2500
RPMs. What are some possible causes to this problem and what are some
possible solutions? Any help would be GREATLY appreciated.

Thanks
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Old 07-18-2005, 23:01   #5 (permalink)
C. E. White
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Re: 3.8L questions


"GLubester" <DoNotEmail@AutoForumz.com> wrote in message
news:1_631499_fabc568eb66a5f79eb0bf35edfc757da@autoforumz.com...
> "GLubester" wrote:


> I just got back from Advanced Auto Parts to get the new codes read. 3
> codes showed up:
>
> 181-Adaptive Fuel rich limit reached at part throttle, system lean,
> right side
> 186-Injector Pulse-width higher than expected
> 189-Adaptive Fuel rich limit reached at part throttle, system lean,
> left side
>
> This pretty much explains why my car doesnt have any power above 2500
> RPMs. What are some possible causes to this problem and what are some
> possible solutions? Any help would be GREATLY appreciated.


Leaking intake manifold gaskets is a possibility. A bad MAF sensor is
another. A dirty MAF sensor is another. Cleaning the MAF wires would be my
first try.

Ed


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Old 07-18-2005, 23:01   #6 (permalink)
Happy Traveler
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Posts: n/a
Re: 3.8L questions

How about checking fuel pressure?

>
> 181-Adaptive Fuel rich limit reached at part throttle, system lean,
> right side
> 186-Injector Pulse-width higher than expected
> 189-Adaptive Fuel rich limit reached at part throttle, system lean,
> left side
>
> This pretty much explains why my car doesnt have any power above 2500
> RPMs. What are some possible causes to this problem and what are some
> possible solutions? Any help would be GREATLY appreciated.
>
> Thanks



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Old 07-18-2005, 23:01   #7 (permalink)
GLubester
Guest
 
Posts: n/a
Re: Re: 3.8L questions

"" wrote:
> "GLubester" <UseLinkToEmail@AutoForumz.com> wrote in message
> news:1_631126_eff7da8a7bbcb2d13e859b2b4ced9bc1@autoforumz.com...
> > Hi everyone. I'm new here and i have a couple questions. I

> own a
> > 1995 T-bird with the 3.8L. My car does lack power, but i

> didnt expect
> > a ton of power from it. But is it common for these motors

> to lose a
> > ton of power above 2500 RPMs? My car will barely accelerate

> from 2500
> > RPMs up, even in first gear. I don't know if there is a

> problem or
> > not.

>
> Any chance you have a restricted exhaust system? Years ago I
> had a Datsun
> 208Z. It got so it would not pull the redline in first gear.
> Even though the
> outside of the muffler and pipes looked good, I was suspicious
> that there
> was an exhaust system restriction. I disconnected the exhaust
> pipe at the
> header and the car's former power was restored. A new exhaust
> system
> rectified everything.
>
>
> > Also my check engine light comes on periodically and goes

> back off. I
> > took it to Advance Auto Parts to have the codes checked out.

> It said
> > bad O2 sensor on bank 1. So i replaced the O2 sensor on the

> right
> > side of the motor (this is bank 1, right?) but the check

> engine light
> > is still on. I haven't had time to get this checked out

> again for new
> > codes. Any ideas on BOTH subjects would be greatly

> appreciated.
>
> If no one reset the codes, then it will take a while for the
> light to go off
> by itself. You can disconnect the battery for about 5 minutes
> to reset the
> light, but it will also reset all the parameters the computer
> has leaned. If
> you are not in a hurry just give it a few days for the light
> to reset
> itself. If the light was supposedly reset, then you should
> have the codes
> checked again.
>
> Regards,
>
> Ed White


C.E.White,

Thanks for the reply. My car is bone stock so it has the origional
exhaust system in it. I donít think it is the exhaust system since I
had new codes show up when i took my car in today to get the codes
read again but I canít rule that out either since I havenít checked it
out.

According to the codes, it sounds like my car is running lean when i
get up on the RPMs, but i have no idea what the Injector Pulse-width
is or how that can be corrected. Ideas?

Thanks

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Old 07-19-2005, 07:01   #8 (permalink)
Happy Traveler
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Posts: n/a
Re: Re: 3.8L questions

The injector pulse width is the time the injector is on. The computer
adjusts it to obtain the correct air/fuel ratio. In your case it went as far
as possible and the mixture was still lean. Look for gross vacuum leak or
(more likely) insufficient fuel pressure. Could be as simple as clogged fuel
filter.

> According to the codes, it sounds like my car is running lean when i
> get up on the RPMs, but i have no idea what the Injector Pulse-width
> is or how that can be corrected. Ideas?




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Old 07-19-2005, 07:01   #9 (permalink)
Tom Adkins
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Re: 3.8L questions

Happy Traveler wrote:
> How about checking fuel pressure?
>
>

Yep, I smell low fuel pressure. The engine is running lean on both banks and the PCM
can't richen it up any more (adaptive limit). Although if the loss of power is
"smooth" with no misfire, I've seen a contaminated MAF do this, usually on 4.6 T-birds
though. Never saw it on a 3.8 but, that don't mean it can't happen.
First step would likely be a fuel filter, especially if you frequently visit the
"mom and pop" stations mentioned earlier. The filter is often overlooked during normal
DIY maintenence and a 9 year old original could be pretty restricted.
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Old 07-19-2005, 13:02   #10 (permalink)
GLubester
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Posts: n/a
Re: Re: 3.8L questions

"" wrote:
> Happy Traveler wrote:
> > How about checking fuel pressure?
> >
> >

> Yep, I smell low fuel pressure. The engine is running lean
> on both banks and the PCM
> can't richen it up any more (adaptive limit). Although if the
> loss of power is
> "smooth" with no misfire, I've seen a contaminated MAF do
> this, usually on 4.6 T-birds
> though. Never saw it on a 3.8 but, that don't mean it can't
> happen.
> First step would likely be a fuel filter, especially if you
> frequently visit the
> "mom and pop" stations mentioned earlier. The filter is often
> overlooked during normal
> DIY maintenence and a 9 year old original could be pretty
> restricted.


Thanks for the replies everyone. When my head gasket went (yes, I had
the dreaded head gasket dilemma), I thought my dad told me that he had
the mechanic replace the fuel filter, which is why I never thought of
it as a possibility. However, he told me last night that it was the
oil filter he replaced twice to get all of the antifreeze out. So,
the fuel filter is definitely step one in trying to fix my car.

Tom Adkins, my car will hesitate on the low RPMs when it is cold but
after holding the s throttle steady, it will take off. There is no
misfiring at all when the engine is warm.

So I will change the fuel filter and clean the MAF sensor. Iíll
report back with the outcome.

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