Allen?

[SierraCrew]

Allen,

This is an update on the thread I started a few days ago. I tried removing the battery cable like you said and letting it sit overnight with no luck. I have noticed some other issues too that maybe you can help with. I don't know if the PCM just got flashed or what, but I need help. I sent this to you too on email just a few minutes ago. But heres a little back history on what I'm noticing.


It started 2 weeks ago, I was driving in town and my engine started to get hot. I get it out into open roads and get her home and park it. My electric fans were not running. I chase down the problem to the VSC. I am running the updated Flex-A-Lite VSC. Apparantly the negative power wire to the VSC came apart. So I fixed this and it has been running perfectly ever since. Thru the work week, I drive mostly highway mileage, so its hard for me to notice low speed issues. But lately, I have noticed an idle issue similar to when I had the G-Force tune. It idles fine once you start it and run it, but if you turn on the A/C or once the electric fans turn on, the idle kicks way up. It jumps from like 600 or 650 rpm, whatever you have the idle set to from the last tune when we met here in Houston, all the way up to like 800-850. The engine pretty much races at stoplights etc. It acts like I'm stalling it up all the time. Once I get back into clean air and the fans switch off, the idle drops back down. At low speeds, like in traffic, like this morning, it wants to race the engine to the high rpm and is hard for me to get below say 20 mph without using the brake. It just won't idle down. I don't know if its possible that somehow whenever the wiring came loose on the e-fans if it somehow shocked the system and changed the parameters of the tune or what. The tune was doing fine before this and I was having no issues with idle whatsoever. Fans on or off, it would idle the same all the time. I also had installed my exhaust cutouts the same day that the e-fans went out, but I don't see why or if that would cause any issues related to this. The cutouts are way back on the exhaust as far away from the cats and 02 sensors as I could get them. It still pulls hard as ever, although it does also seem to may have changed the shift downshift settings ever-so-slightly.

Maybe you could pinpoint this issue and see whats up or let me know if I have bigger issues. If not, I guess maybe you could just send me a new PCM with the last tune that we did from here in Houston when I met up with you and Lance. Like I said, it was running fine with that tune up until the e-fan issue.

Curtis

[storm5.3]

May be a long shot, and this is going to sound totally off the wall, but have you changed plug wires lately ??? I had changed my wires awhile back and the #2 plug wire somehow managed to work itself loose and for a couple of days I had the same problem but mine idled high as soon as I started it. Even had a guy at a shop put it on his MAC scantool and it only saw an occasional misfire. But nothing out of the ordinary, also the transmission was shifting like it was stuck in Tow/Haul mode. And here's the funny part on how we found it. My brother was over one day and I cranked up and showed him what it was doing and we shut it back off and he started checking all the wires and I was like " I just put new wires on it and I checked them already". And he just kept on checking both the plug and coil sides on all of them, then my buddy pulls up and asked what's going on and I was like 'my trucks idling funny, listen I'll crank it up for ya..." I fire it up and it's idling perfect and I'm like WTF . Then my brother starts in on me laughing and said the #2 coil wire was loose and I was like I checked it and he said he felt it snap in on the coil side when he pushed on it. Sorry for such a long post but I kinda wanted to paint a picture of what went on. Hope this helps...Zed

[SierraCrew]

Well, I will definitely check it out this evening. I kinda did a visual check and didn't notice any thing out of the ordinary, but ya never know.

[chrisj6]

I had the same problem a coiuple weeks ago, it wasnt the first time it had happened either. All my wires and plugs are fresh and are all on there good. I was starting to look at the IAC, but its running perfect now. All the symptons I had were exactly what you were describing, except I have the stock fans.

Chris

[SierraCrew]

What'd ya do to correct the problem?

[chrisj6]

I didnt have to do anything, it just went back to normal. It has happened twice, but both times went back to normal after awhile. Defiantely a weird problem.

Chris