Idle hunt questions
Thread Starter
Teching In
Joined: Jan 2003
Posts: 24
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From: Tuscaloosa, Alabama
Idle hunt questions I've searched to no avail, so here goes:
I just purchased my 98 Z28, auto. The mods are as follows: Shaner throttle body, air lid, Hypertech Power Programmer, Mac coated headers, SLP y-pipe, B&B cat back, and a Vig 2800.
Here is the problem: The car is hunting for idle, surging around 200 rpms at all times. I've pulled the following codes from Autotap: P0507 four times and P1416 twice. I know what the codes mean, but I do not know how to fix the problem. The idle is high, around 1000 rpm, and dips to 800 rpm. It also throws the check engine light. I'm somewhat unfamiliar with LS1s, but I can learn fast. Someone mentioned messing with the MAF, but I do not know how to adjust it. On a small sidenote, sometimes the car smokes black a little bit, I think it may be running rich. I couldnt find the Autotap area to see the A/F ratio, does anyone know if Autotaps can read it on 98s?
Any suggestions or possible remedies? The car feels somewhat sluggish, but I'm not sure if it's related to the problem. Could the ECU pull timing in relation to this problem? My O2 voltage is normal...
Thanks,
Jason
<small>[ February 03, 2003, 01:59 PM: Message edited by: bstjnky ]</small>
I just purchased my 98 Z28, auto. The mods are as follows: Shaner throttle body, air lid, Hypertech Power Programmer, Mac coated headers, SLP y-pipe, B&B cat back, and a Vig 2800.
Here is the problem: The car is hunting for idle, surging around 200 rpms at all times. I've pulled the following codes from Autotap: P0507 four times and P1416 twice. I know what the codes mean, but I do not know how to fix the problem. The idle is high, around 1000 rpm, and dips to 800 rpm. It also throws the check engine light. I'm somewhat unfamiliar with LS1s, but I can learn fast. Someone mentioned messing with the MAF, but I do not know how to adjust it. On a small sidenote, sometimes the car smokes black a little bit, I think it may be running rich. I couldnt find the Autotap area to see the A/F ratio, does anyone know if Autotaps can read it on 98s?
Any suggestions or possible remedies? The car feels somewhat sluggish, but I'm not sure if it's related to the problem. Could the ECU pull timing in relation to this problem? My O2 voltage is normal...
Thanks,
Jason
<small>[ February 03, 2003, 01:59 PM: Message edited by: bstjnky ]</small>
Re: Idle hunt questions I think first I would do is
Make the TPS adjustable, then adjust it correctly.
Then I'd unhook the battery for a while so the PCM can relearn idle.
If there was still problems, I'd check out the IAC and the IAC feed hole.
Make the TPS adjustable, then adjust it correctly.
Then I'd unhook the battery for a while so the PCM can relearn idle.
If there was still problems, I'd check out the IAC and the IAC feed hole.
