Ray,
Thanks for the advise but I the '93's have OBD I.
I looked it up in the FSM and it says "Code 52- O2 Signal Stays Above Center
(Rich)", which is not the case according to the Auto X-Ray, OR "Additive
Adaptive memory at Lean Limit". Since the code always comes back 200 miles after
resetting the PCM, it sounds like an Additive Adaptive Memory problem. Would
that suggest I have an overly rich condition that the PCM can't correct? (I
think it was Ray B. that suggested that to me on my original post a few weeks
ago).
.
Greg- You suggested checking my fuek sync. Can an improper fuel sync cause
an overly rich condition?
Thanks,
James
James,
Going to the OBD II web site and punching in your code 52 this is
what they say the code means:
Open or shorted condition detected in the speed control servo power control
circ
Question, does your truck have cruise control? The problem may therein. If
so, the cruise control servo is , I think, mounted on the firewall,
passengers side, directly aft of the valve cover. You can try to follow the
cruise cable from the TB back and it will lead you directly to the servo.
Maybe try unplugging the servo and see if the code clears. I don't know
what else to tell you to check, I can only tell you what OBD II says the
code means. Unfortunately, I'm at work and my FSM is at home so I can;t
look it up for you right now. I trust auto zone to give me a good read out
on what codes my PCM is throwing, but I'm not too sure about their
equipment's ability to correctly interpret the codes.
HTH,
Ray Irons
Dover, DE
>From: JAMEPC@aol.com
>Reply-To: dakota-truck@dakota-truck.net
>To: aol@dakota-truck.net
>Subject: DML: Code 52 Returned!!
>Date: Tue, 24 Jun 2003 17:54:40 EDT
>
>Well, the peoblem returned again. After resetting the PCM and driving 200
>miles with no problems, code 52 "Sustained rich mixture exceeds range of
>control" has returned along with the acceleration hesitations. Any other
>ideas?
>Also, that is the Auto X-Ray's definition of code 52. My FSM is at my
>friends shop. Can someone look it up for me and tell me how the FSM
>defines code
>52?
>Thanks,
>James
>
>
>93 CC, 5.2, Rebuilt engine 30 over, 604 Competition Cams:lift .512 dur@.050
>210, 220 / LSA 112, Heads ported/5 angle , 2bbl M1 Intake, Jet Hot Coated
>Thorley Headers, Ported TB, True Duals w/ FM 70's and Cuda Tips, MP PCM, MP
>Cast
>Valve Covers, MP Cast Air Cleaner, K&N Filter,MP DRT Chain, MSD 8.5mm
>wires, MSD
>6T, Blaster coil, Underdrive Crank Pulley, APS 46 RH Transmission w/ All
>The
>Options, MP Torque Converter, Viper Fan, Lowered 2-3. Energy Suspention
>body
>mounts, A arm bushings & sway bar bushings, 4.10's W/ Dana Spicer Trac Loc,
>Road Master Active Suspention, Doestech Shocks, Front and Rear Anti Sway
>Bars,
>Cowl Hood, Sir Michales Roll Pan.
>
>
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