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EEC or EGR Problem?

3K views 3 replies 0 participants last post by  ShoeSaleman 
G
#1 ·
Have a 1987 Ford Ranger. Fuel injected 2.3L engine.
Problem: Bucks on acceleration. Computer tester indicates idle RPM
problem, code 13 and improper EGR signal. Code 32.
Tachometer indicates proper RPM. Scoped RPM signal, it gets to the
computer.
Checked EGR controlling solenoids. They’re functioning properly. Scoped
EGR signal to computer. It’s getting there. Replaced EGR valve with a used
one, problem not as bad, but still there. Error codes staying.
Suspect either computer or EGR valve bad neither one of them is cheap. But
I am.
Any suggestions?
 
G
#2 ·
"Lemko" <lemko2@aol.com> wrote:

> Have a 1987 Ford Ranger. Fuel injected 2.3L engine.
> Problem: Bucks on acceleration. Computer tester indicates idle RPM
> problem, code 13 and improper EGR signal. Code 32.
> Tachometer indicates proper RPM. Scoped RPM signal, it gets to the
> computer.
> Checked EGR controlling solenoids. They’re functioning properly.
> Scoped EGR signal to computer. It’s getting there. Replaced EGR valve
> with a used one, problem not as bad, but still there. Error codes
> staying. Suspect either computer or EGR valve bad neither one of them
> is cheap. But I am.
> Any suggestions?
>
>
>


It's port injection, right?
- PFE sensor fail/clog or clogged EGR tube?

If the idle 'hunts' or is always high, then look for a vacuum leak or a
bad ISC valve.

Also if the throttle position sensor is bad, that will cause the problem.
Esp on MAP(no MAF) engines.

Note: Believe replacing TPS on that model requires adjustment to .95
volts read with DVM, with throttle stop screw set for ~ 750 rpm idle,
engine warm, (functional) isc disconnected and NO VACUUM LEAKS!


--
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
 
G
#3 ·
Lemko wrote:
> Have a 1987 Ford Ranger. Fuel injected 2.3L engine.
> Problem: Bucks on acceleration. Computer tester indicates idle RPM
> problem, code 13 and improper EGR signal. Code 32.
> Tachometer indicates proper RPM. Scoped RPM signal, it gets to the
> computer.
> Checked EGR controlling solenoids. They’re functioning properly. Scoped
> EGR signal to computer. It’s getting there. Replaced EGR valve with a used
> one, problem not as bad, but still there. Error codes staying.
> Suspect either computer or EGR valve bad neither one of them is cheap. But
> I am.
> Any suggestions?
>
>

13 (KOEO) ISC did not respond properly (extends to touch throttle then
retracts for KOEO)

13 (KOER) Idle Speed Control motor or Air Bypass not controlling idle
properly (generally idle too high)

13 (Mem) ISC sticking, open ITS circuit or TP sticking

Which 13 is it? And like BM says check the TPS for the
bucking/hesitation and pull the vac off the EGR too and try it. You can
use a volt meter at the tps to test it, it should run at around a 1/2
volt at idle to about 4 1/2 to 5 at wide open. VERY slowly open the
throttle and watch for a smooth transiston (of voltage) from closed to
wide open. Do this several times. They seem to like to fail when the
throttle is in the off idle/cruise area. If I remember correctly the
Ferd scool teachers said to always fix lower number codes first starting
with KOEO, then KOER, them memory. I would clear the codes right now,
then start with KOEO and go from there. Oh, and since you can't see data
on that year buy a book with emisions flow charts. Ford ECM's can
diagnose themselves in a since if you follow the flow exactly. Of course
its gonna suck a little when thy tell you to "install breakout box":(
but you can get around that too. Oh, and don't ignore the "visual
inspection" part. Good luck.
 
G
#4 ·
ShoeSaleman wrote:
> Lemko wrote:
>
>> Have a 1987 Ford Ranger. Fuel injected 2.3L engine.
>> Problem: Bucks on acceleration. Computer tester indicates idle RPM
>> problem, code 13 and improper EGR signal. Code 32.
>> Tachometer indicates proper RPM. Scoped RPM signal, it gets to the
>> computer.
>> Checked EGR controlling solenoids. They’re functioning properly. Scoped
>> EGR signal to computer. It’s getting there. Replaced EGR valve with a
>> used
>> one, problem not as bad, but still there. Error codes staying.
>> Suspect either computer or EGR valve bad neither one of them is cheap.
>> But
>> I am.
>> Any suggestions?
>>

> 13 (KOEO) ISC did not respond properly (extends to touch throttle then
> retracts for KOEO)
>
> 13 (KOER) Idle Speed Control motor or Air Bypass not controlling idle
> properly (generally idle too high)
>
> 13 (Mem) ISC sticking, open ITS circuit or TP sticking
>
> Which 13 is it? And like BM says check the TPS for the
> bucking/hesitation and pull the vac off the EGR too and try it. You can
> use a volt meter at the tps to test it, it should run at around a 1/2
> volt at idle to about 4 1/2 to 5 at wide open. VERY slowly open the
> throttle and watch for a smooth transiston (of voltage) from closed to
> wide open. Do this several times. They seem to like to fail when the
> throttle is in the off idle/cruise area. If I remember correctly the
> Ferd scool teachers said to always fix lower number codes first starting
> with KOEO, then KOER, them memory. I would clear the codes right now,
> then start with KOEO and go from there. Oh, and since you can't see data
> on that year buy a book with emisions flow charts. Ford ECM's can
> diagnose themselves in a since if you follow the flow exactly. Of course
> its gonna suck a little when thy tell you to "install breakout box":(
> but you can get around that too. Oh, and don't ignore the "visual
> inspection" part. Good luck.

Oh, and another thing, clean the throttle bore and IAC first too. That
alone might fix your 13 code.
 
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