89 Mustang engine bucks btwn 45 & 65 mph & lots of black smoke exhaust

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LauraK - 19 Dec 2005 02:44 GMT

I have a 4 cyl A code that sometimes bucks and loses power at around 45- 65
mph. I also get a lot of carbon thru the tailpipe. BUT, the plugs aren't
carboned up. It bucks so hard that I can sometimes hear the u-joints
banging back and forth like the rear end is going forewards and back. I've
done a complete tune up, checked pcv, egr, replaced the computer and
checked timing.
Also put in a new trans filter and changed the fluid.

Any advice or ideas?
Thanks-
Laura

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Backyard Mechanic - 19 Dec 2005 04:37 GMT

> I have a 4 cyl A code that sometimes bucks and loses power at around
> 45- 65 mph. I also get a lot of carbon thru the tailpipe. BUT, the
[quoted text clipped - 3 lines]
> replaced the computer and checked timing.
> Also put in a new trans filter and changed the fluid.

But it starts and idles okay, cold and warm?

I'd rather know the RPM's... and see if it's same rpm range in both OD
and D
On Acceleration or even when you hold (or try to hold) speed

Also.. does it have a MAF?

Check engine Light doesnt come on?

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Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

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LauraK - 20 Dec 2005 15:10 GMT

Yes it starts ok and idles ok in cold and warm.

Haven't watched RPM's but the trans doesn't seem to be slipping. It does
seem hesitant in OD, sometimes it engages at 45...sometimes at 50.

Nope, no MAF, it has B.MAP.

Check engine light hasn't come on.

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alexiastation - 20 Dec 2005 15:42 GMT

> Yes it starts ok and idles ok in cold and warm.
>
[quoted text clipped - 5 lines]
>
> Check engine light hasn't come on.

I don't know if this will help but my friend had similar problem with
her 2001, no check engine light either, but she went to autozone and
they hooked it up for free and read the meter, and it was a sensor in
the exhaust system. It was an 80$ part but it was very easily installed
from a guy friend of hers so no added cost in labor. Do you think that
might be the same for you? Hope it is nothing serious!
Take Care,
beth

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CJB - 20 Dec 2005 19:52 GMT

Unfortunately, the poster's 89 is an EEC-IV system. AutoZone will only read
the 95-up OBD2 systems.

CJB

>> Yes it starts ok and idles ok in cold and warm.
>>
[quoted text clipped - 14 lines]
> Take Care,
> beth

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Sharon K.Cooke - 20 Dec 2005 20:29 GMT

> Unfortunately, the poster's 89 is an EEC-IV system. AutoZone will only read
> the 95-up OBD2 systems.
[quoted text clipped - 19 lines]
> > Take Care,
> > beth

You can BUY a perfectly acceptable EEC-IV digital reader for about $35. Then
there's the cheap way: http://www3.telus.net/neatcrap/eec4.gif

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