Need help with converter probs
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 71
Likes: 0
From: Houston, TX
Need help with converter probs I have a ST3500 and let me say first that the performance is great and I love it when it works right. Which brings me to my problem. The converter doesn't always work right. Sometimes it won't lock up right away when I slip it into OD once I get up to 45-50 mph. When this happens, I have to run it up to anywhere from 55 to 75 mph before it will lock up and then I can slow back down to 45-50 mph. It sets of the SES light at least twice a month, and sometimes more. Other times it will flash the SES light for about 10 seconds if I punch it from a roll while in D and shift into OD.
The most annoying problem though is the idle surge I have after the enginge gets up to operating temp. It's most pronounced when I have slowed down and am rolling forward at a idle. It will dip down to 400 RPMs and then back up to 700 RPMs over and over untill I either come to a complete stop or accelerate again. It has died on me more than once while doing this and also when turning sharply at an idle or slightly above. I have tried the idle relearn procedure many times and it only helps a little or not at all, and I constantly check the fluid level to make sure it right. Again I love this converter, but I would like to solve at least the surging idle so drinving could be a little more enjoyable. Sorry for the length, and any advice or ideas is greatly appreciated.
The most annoying problem though is the idle surge I have after the enginge gets up to operating temp. It's most pronounced when I have slowed down and am rolling forward at a idle. It will dip down to 400 RPMs and then back up to 700 RPMs over and over untill I either come to a complete stop or accelerate again. It has died on me more than once while doing this and also when turning sharply at an idle or slightly above. I have tried the idle relearn procedure many times and it only helps a little or not at all, and I constantly check the fluid level to make sure it right. Again I love this converter, but I would like to solve at least the surging idle so drinving could be a little more enjoyable. Sorry for the length, and any advice or ideas is greatly appreciated.
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 71
Likes: 0
From: Houston, TX
Re: Need help with converter probs Yup, all my mods are in my sig. I can't give you my IAC counts since I don't have access to any type of diagnostic software. I know I really need ATAP, but I just haven't been able to spend any money on mods lately.
TECH Addict
Joined: Nov 2001
Posts: 2,003
Likes: 0
From: Live Oak, FL - in the woods where the creatures lurk.
Re: Need help with converter probs I still get some surging at idle. It doesn't dip very low, actually it will increase in rpms some and quickly drop back to normal. My car for some reason has always had some idle surge, it's just more noticeable with the converter. So, I guess I'm just used to it.
It's not unusual for mine to not lock right away when I/it shifts to OD, it depends mostly on the throttle position or rpm. Backing off the throttle usually lets it lock into OD in the 47-50 mph range, but it will lock anyway if the throttle angle is low enough. And like yours, once locked it will stay that way down to around 45.
After more than a month, still no codes or SES.
It's not unusual for mine to not lock right away when I/it shifts to OD, it depends mostly on the throttle position or rpm. Backing off the throttle usually lets it lock into OD in the 47-50 mph range, but it will lock anyway if the throttle angle is low enough. And like yours, once locked it will stay that way down to around 45.
After more than a month, still no codes or SES.
Re: Need help with converter probs you could try turning your idle screw just a tad. You don't want to do it very much, but slightly might raise the idle a tad and keep it from surging down to 400. Don't do it too much or you'll throw a code.
Re: Need help with converter probs Are you running the stock MAF?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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