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Username Post: Extremely rough running at idle.        (Topic#354156)
Posts: 18

Reg: 11-13-18
12-07-18 10:35 AM - Post#2753742    
    In response to 65_Impala

Okay, after all the checking, I found a vacuum tube that was cemented to the purge solenoid, and after getting off the old tubing, and putting some tubing that was in better shape, it runs a good bit better in closed loop. Don't worry, I feel dumb for overlooking it. Here's a video for it running, about half way through the video, I cut it off and back on again to show that it's still surging a bit, not nearly as bad though.

The BLM is still super low, but the O2 is working much better than before and the heater on it is working. I had checked the tubing before when I changed the intake gasket and sprayed starter fluid around it after the replacement, but it didn't show any sign of degradation until now, but maybe I missed something. Either way, it's a bit more drive-able, I'd still like to get to the bottom of the weird BLM.

Posts: 18

Reg: 11-13-18
12-07-18 02:17 PM - Post#2753761    
    In response to Smallen96

Update: The truck still surges for a minute or so on cold startup and warm startup, but runs fine after a minute or so. Also, when it switches from open loop to closed loop, its now seamless. That's the symptoms that started my journey of repairs with the truck and I'm guessing the vacuum leak exacerbated the symptoms. The BLM is still dropping steadily to 110ish, which is still very rich and I'm not sure what to check next.

Posts: 42

Reg: 07-16-05
12-08-18 08:12 AM - Post#2753856    
    In response to someotherguy

I don’t know if applicable here, but in using Tunerpro on my 93 c1500, for the ECU and code running I found that knock retard was not actually output. In the .adx file there was a comment for knock retard For data logging "Knock Retard" instead of "Battery Voltage". The bin must be change at L51FE to support this.
If same for this ECU perhaps knock retard output is not correct?

65 Belair 350
68 Camaro 327
85 Caprice 5.0L
93 Suburban 5.7L TBI

Posts: 18

Reg: 11-13-18
12-08-18 10:33 PM - Post#2753946    
    In response to Sabino

I don't think the knock is an issue because as the dude before said, the knock count isn't actively rising, which means that it's not actively knocking, so there wouldn't be and retard anyway

Posts: 34

Reg: 09-06-16
12-10-18 03:21 PM - Post#2754096    
    In response to Smallen96

May I suggest checking the fuel pressure regulator if you have a TBI? In the past I have had it go out, rebuilt it ,but did not change the spring only to find it had broken into pieces.

Posts: 18

Reg: 11-13-18
12-10-18 05:23 PM - Post#2754109    
    In response to gfm64

Yeah, I've already rebuilt mine, and then because I wasn't sure, bought a brand new assembly, so I hope that's not it.

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