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
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
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!
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.
Thanx "BackYard Mechanic" and "ShoeSalesman" for your help.
First to answer your questions about how the code was obtained.
At KOEO = 11
At KOER = 13, 32
Checked TPS voltage. Was at 1.2 volts.
Was unable to adjust the TPS on engine so I removed the trotle assembly
from the engine. Discovered EGR port and PCV port on the trotle assy
Cleaned out the plugged ports. Replaced PVC valve. Adjusted TPS to 0.73
volts ( 1/2 way betwee BM & SS advice).
Truck now runs like a charm but. I still get code 13 & 32 at KOER. KOEO 11
Does it seem to idle too high? That will cause the 13. Fix that first
then run the tests again. It could be that the IAC is bad or dirty or
idle is set too high. It would probably be a good idea to get a book on
it and set the minimum air if the cleaning doesn't get it. The 13 code
means the IAC can't control/lower the idle correctly.
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