Bad experience today at the tuner.

I've been having problems with my PCIII since I bought it from Jamie a couple of months ago. Could not get rid of the hesitation/missing between 2000 and 3000 rpm. I tried different maps, reset the throttle, etc., but nothing ever worked, even the map Jamie sent me.

So, off to the dyno I go to make everything all better, right? Wrong. I get there, they hook up the bike, and as I'm looking over the merchandise and large selection of NEW bikes, the service mgr comes out and says they are having a problem -- they can't get the throttle position to reset off 100%. So I says, but I've been able to reset it so you should be able to, at which point they invite be back to see my baby in ICU, all hooked up and everything, and sure enough throttle reads 100% steady and the top green light on the PCIII is lit up. They tried everything but couldn't get it off 100%.

So, I asked them to power it up with the battery instead of the bike, and what do you know, throttle resets to 0%. Then, when they turn the bike back on, it goes right back to 100%.
They said they had tried the throttle reset but that it wouldn't, but I don't know if they tried the master reset on the PCIII. Reckon that would make a difference?

They say they've seen more problems like this with MM EFI systems, but never as bad as this. They also said that they've seen the MM EFI systems "eat" PCIII's, meaning they've seen more failures of PCIII's on these bikes than Delphi's.

So, they politely unhooked my bike from ICU, patted me on the behind and sent me on my way, free of charge I might add. Hell they worked on it for an hour trying to get it to go, but didn't. Thought that was decent of them not to charge me, since I didn't know I had a bad PCIII. Before I left, they explained why I've been having problems in the 2000 to 3000 range. The map I was using, probably like most, have negative values in the 2000 to 3000 range, so with my PCIII thinking the throttle is at 100%, it's running too lean. Makes sense to me.

So, after calling Jamie who sent me to Dynojet, I got an RMA to return this unit and have them check it out and hopefully replace it, but it means I'll be out of commission for a while.

My question is this, do you think I could have a bad throttle position sensor? My bike has 28,500 miles, but it ran okay before I added the Rinehart TD's and a/c and PCIII, so not sure that's it. You'd think if I had a bad TPS it would show up in more ways than one.

So, before I send my PCIII back, any ideas what else it might be? Sorry to be so long, but got to talk to someone and wife's not interested!

 

As in the TPS is sending the wrong info to the PCIII. Have you tried to disconect the PCIII and see if the problem goes away or is still there?

 

Geez, what a nightmare. I'm sure the dealer can determine if your TPS is acting right, so I would definitely not sent the PCIII back until a verdict on the TPS is made. Since it seems to work fine on the 9V adapter, it points the finger at something else, like the TPS. I can see why your bike didn't run well, frozen at 100% TP at all times. My map is mostly positive at 100%, with one -1 at 3k RPM and another at 4500.

 

It's a problem with the unit. I had the same problem, bike had a miss from 2200 to 3000 RPM and had a problem keeping the throttle position set correctly. I sent mine back to DynoJet and they sent me a new one. Solved the problem. Runs great now.Also installed new stock plugs, that seemed to help the bike run smoother at idle.

SteveO

 

Hey, Bryan, good idea, but if I disconnect the PCIII, how will I know? Right now the only way I can see the throttle position is through the PCIII software, so if I disconnect it, I won't be able to see the throttle position. I could check to see how it runs, but since I've changed the a/c and exhaust, it will probably run lean throughout the range. Not sure what to check?

 

Thanks, Steve, that's good to know. Maybe it's the PCIII after all. Sure do hate to be without a ride for a week or so, though.

 

I meant more to see if the hesitation goes away. As far as running lean my PCIII is still in the boxI have the S&S 510 G's V&H TD with the SE air cleaner. All i have is the Download when they put the 203 Cams in with the stock exhaustmany years ago before i bought the bike. Mine doesn't run all that lean. Plugs are just a tad on the white side but not all that bad. Iv'e seen wayworse.

 

That's a good idea. I'll check it out tomorrow. If it runs okay (without the hesitation), then I assume the PCIII is bad.

If I've got a bad TPS, what would I expect to see?

 

Tdog, I would guess the same problem as with the PCII hooked up, missing, hesitation. Just keep a eye on the plugs, they'll tell you if and how lean it's running. Look at em before you unhook the PCIII. Go for a ride and remember that your nose and legs will tell you if it's running hot also. Let it cool down some and do a plug check. I'm sure you use a quality synthetic oil so even if it's a little lean,you'll be fine.

 

My point above was to take it to the dealer. Their diagnostic software should be able to tell TP. I don't know for sure, but you would think they would have that capability.