88 Suburban 350 running badly, poor mileage. TBI rebuild time.

[PlayingWithTBI]

Don't use anything caustic, it'll eat the aluminum.

 

[geocrasher]

I ended up with some 400 and 600 grit sand paper, it cleaned it right up. Now I just need to find time to put it all back together.

 

[geocrasher]

Started putting it together tonight to find out that I either lost one of the filters for an injector, or it's missing from the kit. And I threw all the old stuff away of course, long gone. Looks like I'll be ordering another rebuild kit.

 

[bigfutz]

Started putting it together tonight to find out that I either lost one of the filters for an injector, or it's missing from the kit. And I threw all the old stuff away of course, long gone. Looks like I'll be ordering another rebuild kit.

You mean this?
https://www.oreillyauto.com/detail...n-throttle-body-injector-filter/r3071/5816743

 

[geocrasher]

Yup that's the one. I didn't think they'd be something you could buy separately. Thanks for that.

 

[geocrasher]

I went ahead and picked up a filter and got it put together today. I did the IAC reset procedure: 30 seconds on the jumper, pull the IAC plug, back off the idle screw, fire it up. It was idling around 2000 rpm (I'm guessing, I don't have a tach) and there was no way to get it to idle below what sounded like about 1000 rpm. I went ahead and reconnected the IAC and it idles, badly. The exhaust is slightly white and smells gassy and I think it's just running super rich.

I did make a mistake and fire it up with the MAP sensor disconnected at first (oops!) and it ran especially bad then. I've take a short video of the fuel spray at idle, perhaps someone can tell me if this is about right:

xc_hide_links_from_guests_guests_error_hide_media

Clearly this is my first time doing this. I'm not dumb, and I'm not completely inept, but I do believe I've gone wrong somewhere here. Thanks for the assistance.

 

[Schurkey]

What is the data stream showing?

Codes are fine and all, but the data stream is what's most important.

 

[geocrasher]

That is a good question. I need to nail down my 160 baud ALDL setup and get back to you on that.

 

[geocrasher]

I did make an ALDL cable and found an Arduino sketch that purports to read the 160 baud data off the E connector. But, I wasn't able to make it work. I'm probably doing something wrong It's okay, I just decided to button it up for now so I can move onto some other things. I'm definitely going to revisit it.

The truck is idling better than before it seems, and it's not stall/surging as before. I took it on a shakedown run around town and then hopped on the highway and opened it up. Acceleration is back where it ought to be, and when I went WOT it downshifted the 700r4 and pushed me back in my seat. Hasn't done that in a while Despite that lack of instrumentation telling me it's all better, I'm calling it a success for now. I'll report back with more eventually.

 

[bigfutz]

The truck is idling better than before it seems,

So what happened between 7/15 and now? Last report I thought it was running rough? I’m wanting to do this IAC reset, but I feel I need some more electronic gadgets to do it.