DRR Pro
| I would look at the ignition...The AL2 is still an analog ignition, and the rotary switches are nothing more than variable resistors...When you're on the limiter, it's possible that you're getting that fault due to the resistor failing....just a thought....unless you have a digital ignition, all of MSD's limiting is done with resistor chips or dials, and depending on temp/etc. they can give mixed results...and resistors and their connections fail....never been a fan of the dial... Maybe someone has another ignition you can try to see if the problem goes away? Where in Florida are you? Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com"Speed kills but it's better than going slow!" Authorized Amsoil Retailer |
| Posts: 1561 | Location: Back home in Alaska! | Registered: February 13, 2011 |
IP
|
|
DRR S/Pro
| Did you try footbraking? Try another 2 step? Are you using a delay box or no boxing? If delay box remove it and wire direct from button to TB. Any possibility of something back feeding? Is linelock wired to activate with TB? I'm just throwing ideas out, intermittents are the worst! |
| |
DRR Top Comp
| I agree with checking carb first. any time car acts stupid (Back when I ran carbs) first thing I would do is blow out air bleeds and verify that they are open. They get clogged easily and car will act stupid. Then go to your basic carb tuning, are you sure you are getting booster shot IMMEDIATELY when you hit gas? If your idle mixture is too lean it will have stumble. Even if it is right during Summer this time of year air gets better but Idle mixture does not. Now you go stumble again. (Blow out air bleeds) and reset idle mixture. https://postimg.cc/gallery/np3zpruo/"Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion |
| Posts: 4352 | Location: United States of Texas | Registered: April 02, 2011 |
IP
|
|
DRR Pro
| quote: Originally posted by Wooley: Is it a trans brake release hesitation or a motor stumble?
It is a trans brake release hesitation...no stumble and the car runs fine once it leaves...60', 33' and 660' numbers are on point as well as mph... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by Coloradoracer: I would look at the ignition...The AL2 is still an analog ignition, and the rotary switches are nothing more than variable resistors...When you're on the limiter, it's possible that you're getting that fault due to the resistor failing....just a thought....unless you have a digital ignition, all of MSD's limiting is done with resistor chips or dials, and depending on temp/etc. they can give mixed results...and resistors and their connections fail....never been a fan of the dial...
Maybe someone has another ignition you can try to see if the problem goes away? Where in Florida are you?
I am calling MSD tomorrow to see if the 2 step part of the box could possibly cause this...I am in Melbourne, Fl...I am not an electronic kind of guy...lol... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by ferndaleflyer: You may be looking the wrong place---how about the carb? Several conditions there could cause this. Just a suggestion.
We thought about that but it is not a stumble...we cleaned the carb top to bottom anyway and put in new needles and seats...sigh... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by 3677: HAVE YOU TRIED A DIFF CARB HAD SAME KIND OF ISSUE SWITHED CARBS ISSUE GONE 1ST CARB 825 DEMON 2ND CARB QF 850 THEN HAD OPP TO TRY 900 HP HOLLEY METH CARB WORKED GREAT PICKED CAR UP 2TENTHS
Not yet...again, the car runs fine once it leaves...thanks for the thought... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by Wooley: Have you had your carb cleaned recently? You may try to open the idle mixture screws a half turn. I have to do this on my small block if I have a stumble in cooler conditions in fall.
We clean the carb every year due to gunk from the 10 ethanol in pump gas....I also use Luc as E85 cleaner regularly to keep the level of junk down...the car does this in 90* weather and 50* weather... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by TD3550: A lot of variables there.. Carb?? RF leakage? Check the charging system?
I know on the older 6AL's, i had to put on the MSD 8830 on 2 cars. Bizarre problems. When was the last time you checked the reluctor wheel/pickup for rust accumulation.
Just some of the basic items.
Ohm out the pick up coil when your in there too That there is one item that is skeptical to change with heat. 400-1300 i believe.
All else fails>> More Beer lol
I am not an electronics kinda guy so I have not done any of this....what I did do is have the entire car re-wired by a pro...every wire is now correct and every ground is perfect...pricey but the car needed it regardless...btw, I run an alternator and it shows over 13 volts at idle... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by Eman: Did you try footbraking? Try another 2 step? Are you using a delay box or no boxing? If delay box remove it and wire direct from button to TB. Any possibility of something back feeding? Is linelock wired to activate with TB? I'm just throwing ideas out, intermittents are the worst!
Yes, it does not hesitate when footbraked leaving at 3000 rpm...I have not tried another 6AL2 box yet...I am a no box racer...no, the line lock is not tied to the TB...yes, intermittents are awful...thanks for the ideas...I now have the button on a quick disconnect but this issue happened way before I had the car re-wired... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|
DRR Pro
| quote: Originally posted by Curly1: I agree with checking carb first. any time car acts stupid (Back when I ran carbs) first thing I would do is blow out air bleeds and verify that they are open. They get clogged easily and car will act stupid. Then go to your basic carb tuning, are you sure you are getting booster shot IMMEDIATELY when you hit gas?
If your idle mixture is too lean it will have stumble. Even if it is right during Summer this time of year air gets better but Idle mixture does not. Now you go stumble again. (Blow out air bleeds) and reset idle mixture.
We will re-check the carb after the holidays but everything was fine a couple of months ago...when I let go tghe car hesitates for a split second and then leaves all on it's own...all the numbers down track are in order as well as the mph...no stumble on launch or down track anywhere...sigh...it is a bit bizarre...feels funny when you let go and nothing happens...that split second seems like forever... |
| Posts: 1280 | Location: Florida (FL) | Registered: June 06, 2006 |
IP
|
|