[Shotimes] OT: '93 Ford Ranger Error Codes

[Robert Bruce]

Maybe you could find help at:

http://www.rangerpowersports.com/
http://www.therangerstation.com/

Robert Bruce
93 atx


-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net]On Behalf Of Steve Weinrich
Sent: Monday, March 31, 2003 8:49 AM
To: SHOtimes
Subject: Re: [Shotimes] OT: '93 Ford Ranger Error Codes


Josh,

My 93 Exploder with the 4.0/ATX did much the same thing.  I remember it well
because I had to fight my warranty company to cover the continued repairs
that were needed to fix it.

In my case, it was the TPS that was causing the erratic engine speed,
especially at constant cruising speed.  It was shifting in and out of O/D
and downshifting like crazy with a CEL.  There was a worn spot on the sensor
that corresponded to the throttle position used at interstate highway cruise
control speed.

After replacement of the TPS, the erratic performance was fixed, but I still
got a CEL with 172 and 176 codes.  New O2 sensors fixed that.

In your case, I would suspect a vacuum leak as the possible cause of the
variety of O2 codes.  If the O2 sensors are over 60K, I would definately
replace them anyway.  As for the vac leak, if there is nothing obvious as
far as hoses go, I would suspect either the ISC or the intake manifold
gasket.

If it were my project and I had a few hours to invest in it, I would:

1)  Inspect for and repair any vac leaks

2)  Clean the MAF sensor filament

3)  Replace the TPS

4)  Replace the O2 sensors

5)  Clean the ISC/IAB valve

6)  Inspect the plug wires and plugs, replace if at end of life

7)  Catch the engine when in "failure mode" and test the intake manifold for
leaks by spraying carb cleaner around the gasket and bolt surface mounting
areas and see if you can catch the leak.  On the 4.0, there was a
significant history of intake bolts that were loose.  Tighteneing them fixed
the air leak.

The Bosch O2 sensors sold by AutoZone have proven themselves to be very good
replacements in the SHOs.  I would put them in anything.  Around 35-50 bucks
each, depending on your local market.

You're looking at around $80-100 for all three sensors from AZ.

Steve


----- Original Message -----
From: "Josh Salaets" <jsalaets@msn.com>
To: "SHOtimes" <shotimes@autox.team.net>
Cc: "NWSHOC" <sholist@yahoogroups.com>
Sent: Sunday, March 30, 2003 11:59 PM
Subject: [Shotimes] OT: '93 Ford Ranger Error Codes


> I am hoping you guys can help me diagnose a problem with my grandparents'
'93
> Ranger 3.0 AT with 73K miles on the clock. For quite a few years, the
truck
> has often started bucking (surging) after being driven for a long time
(100+
> miles). During this time, the "Check Engine" light turns on. It is
difficult
> to even keep it at 55 mph, and it often downshifts to stay there - it's as
if
> I'm climbing a steep hill, yet I'm on level ground. If I get on it real
hard,
> it'll clear up and accelerate fine, but as soon as I start cruising, it
comes
> back. This problem comes and goes at random - sometimes it will go away if
the
> truck is turned off and back on, while other times it takes a full night
of
> cooling off for it to go away. I have ran the codes before, and it showed
the
> left bank was running lean.
>
> This really wasn't a problem until I took the truck to Idaho this last
week -
> it acted up REAL bad once on the way there, and on the way home, I had to
> fight it ALL the way back - 430 miles!
>
> I ran the codes when I got home. There were no KOEO or KOER codes, but I
came
> up with a TON of Continuous codes:
>
>   a.. 171 - No HEGO switching detected/adaptive fuel at limit (RH)
>   b.. 172 - HEGO snesor indicates system lean (RH)
>   c.. 173 - HEGO sensor indicates system rich (RH)
>   d.. 175 - No HEGO switching detected/adaptive fuel at limit (LH)
>   e.. 176 - HEGO sensor indicates system lean (LH)
>   f.. 177 - HEGO sensor indicates system rich (LH)
>   g.. 188 - Adaptive fuel lean limit is reached (LH)
>
> It would seem both 02 sensors have bit the dust, but it seems odd both of
them
> have died. What do you guys think? Would faulty O2 sensors create this bad
of
> driveability issue, or is there something else I should be looking for?
>
> I was thinking it could be clogged cat(s), but this would likely be a
constant
> problem instead of intermittent. I was also wondering if a bad MAF or TPS
> could cause this, even if they aren't showing up as being bad during the
test.
> Is there another sensor that could cause this?
>
> Any help would be GREATLY appreciated, as I would like to get this problem
> fixed by tomorrow, since the truck is going to Colorado Tuesday.
>
> If I do need new O2 sensors, anyone have recommendations on what brand I
> should buy or where I should go (we have Autozone, Napa, Schucks, and a
few
> other local parts stores)?
>
> Thanks A LOT, and sorry for such a long OT post!!!
>
> Josh Salaets
> 95 SHO MTX (See it at: www.cardomain.com/id/sh0gun)
> 85 Omni GLH-T (Yeah, it's fast)
> NWSHOC Member
> Eugene, OR
> _______________________________________________
> Shotimes mailing list
> Shotimes@autox.team.net
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