Wow! Yeah, Paul. My head's spinning, too. BUT, at least now I know what
needs to be done. I've got to go find, as you say, an *honest mechanic.*
Thanks for the great info! It really helps to know what you need before
you go looking for it. I can print your letter and have it in hand when I
go get this done. I prefer knowing what should be done as opposed to
having someone just *poking around* and changing things that may or may
not need replacing.
It's really wierd about this thing because except for the occassional
stumble from first to second when I first start the truck, it's really
fine. For instance, coming home from work Friday, I passed a chabby pu
with a 350, dual exhaust, fat tahrs, etc just going thru traffic after a
light turned green (Wurzbach just east of Fredericksburg). I knew he
would have jumped in front of me (he was in the right lane, I was in the
left) if he got the chance. No way. He finally did get through traffic
after the HEB and he yelled over at that light that I had a "cute little
truck, but could it run?" I promptly blew him away when the light changed
and though he tried to catch up, he was several truck lengths back and
fading all the way to Vance Jackson, where he snuck off.
The point is, though, the truck runs great other than the stumble.
Naturally, I do want to get this checked out.
Thanks agin for the info. When I find that mechanic you mentioned and get
the work done, I'll let the list know what it was.
Thanks, Boog!
Richard in San Antonio
On Sun, 19 Sep 1999 09:20:21 EDT BoogYT1300@aol.com writes:
>The TCC relay is always activated once the ignition is in the on pos.
>There are three things that could be wrong. The ign. switch/TCCR
>connection
>is bad, TCC relay is shorted out, or the PCM is not recognizing the
>signal.
>My diagnostic manual has a way to check it, but you need a DRB or
>equivalent
>scanner to actuate the solenoid when checking the PCM. If you can get
>access
>to one, or if you know of a good honest mechanic he can check the PCM.
>For
>the other two, this is what you can do. Find the TCC harness. It
>should be
>on the left side of the tranny. It is a three prong in-line
>connecter.
>There should be a orange/black wire, a dark blue wire, and a
>orange/green
>wire. You have to have the TCC relay actuated, just turn the key to
>the on
>pos.
>Using an multimeter, first probe the middle, dark blue wire. You are
>looking
>for voltage above ten volts. If not repair the ign.switch output
>circuit to
>the TCCR.
>
>If above 10v then you need a DRB.
>You have to dissconnect the PCM harness and actuate the TCCR with the
>scanner.
>I dont know how they number the pin holes in the connector, but it is
>the 6th
>one in onthe top row, left side (when the harness is facing the comp).
>Or pin
>54. Using an ohmmeter, probe hole 54 on the pcm harness. If
>resistance is
>below 5 ohms, the TCCR is bad. There is a short to ground.
>
>If resistance is 5 ohms or better, probe hole 54 and the hole for the
>
>orange/black wire on the TCCR. If resistance is below 5 ohms then the
>TCCR
>circuit is stuck in open state.
>
>If resistance is 5 ohms or better then reconnect the TCCR and turn the
>ign
>on. Probe hole 54 with a voltmeter and the reciprocating pin on the
>PCM. If
>voltage is above ten volts, the PCM is bad. If below ten volts,
>repace the
>TCCR in the transmission.
>
>Well, my head is spinning, how bout yours?? I am just reading this
>out of my
>diagnosis manual. Unless you understand everything I wrote, I would
>suggest
>taking it to a mechanic.
>The only test you can do in your driveway is to test the ign switch
>circuit.
>Unless you have a DRB or equivalent.
>Hope this helps
>Boog
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