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You can always pop it open & look for leaky capacitors. What did yo do with the speedo/PSOM/VSS circuitry?
Factory (pruned) harness. VSS off the rear axle (Sterling 10.25); snagged a PSOM from junkyard — stashed behind the dash along with the OEM LCD and little red button.
Aftermarket electronic speedo, calibrated to the PSOM output. Also included OEM OD switch. Aftermarket shifter (Sidewinder).
Scndsin, I recall your advice was extremely helpful back during the build whenever I'd pop over to this forum from the '48-'56 forum to figure out this 5.8 drivetrain install…
A few pix of how it all turned out:
Up until now, it has been trouble-free! (Knock on wood…) Lots of attention on the road, for sure, and super fun to drive.
Well fluid is good (actually a tad high on the dipstick). Guess I'll attempt the drive cycle test wwhite posted tomorrow (before Wednesday's snow). Then I suppose I could pop open the EEC this weekend and take a look at the capacitors.
I already replaced this PCM just shy of 2 years ago after finding this in the original donor box:
So today I opened the replacement and lo and behold it appears to be the same capacitor!
I remember at the time of replacing this in '19 I read about some people actually just replacing the capacitor itself for less than a couple of bucks instead of buying an entire PCM; has anybody had any luck doing that?
Thankfully (knock on wood) the truck still runs for now, so I put it back together and figure out next steps.
Had a 20% discount as well as some "rewards" credit at a local auto parts store (Autozone), and was happy to see they offered a remanufactured PCM with the proper matching code for my 5.8/E4OD… which turned out to be just a bit cheaper than sending it away to be repaired (and no down time for the truck).
Replaced it yesterday and initially thought it solved my problem, but sadly today the "surging" happened again (let off the throttle to coast, and RPMs will rev slightly, three times before settling). So far no issue with the TC lockup at least.
So… what else could be causing this "bucking" if not the PCM, or, what are the odds that this refurbished one isn't quite right? Do I send it back and try again, or is something else the underlying problem?
I suggest posting at EFIDynoTuning Forum - Categories, and asking the question.
Getting a straight answer would be a lot more beneficial than guessing the problem.
EFIDynotuning is a tuning site, and if its a problem that has happened before, you'll get the answer there within a day.
Yes, the Torque Converter lockup is controlled by the computer via a solenoid.
Have you checked the electrical connections on the trans, make sure they are clean and no corrosion.
Do you have a transmission cooler or a transmission temperature gauge?
Being in a '52, I'm sure its used to burn some rubber. Do you do burn outs in drive?
Did you rebuild the transmission, or install the pressure regulator assembly and the TCC function that is in the pump, as recommended a few years ago?
Not to hijack the OP thread but being I am still pretty new to the forum could you elaborate what this does??
Thanks for the lead… based on a reply there I replaced the IAC valve and (knock on wood): no more surging!
Originally Posted by wwhite
I suggest posting at EFIDynoTuning Forum - Categories, and asking the question.
Getting a straight answer would be a lot more beneficial than guessing the problem.
EFIDynotuning is a tuning site, and if its a problem that has happened before, you'll get the answer there within a day.
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), so no new codes afterward.
D'OH!
