engine stumble

[avmech]

hope you guys can help me out. went to Sutton to have a tune done. car runs good but for some reason every now and then it stumbles. I can roll into it or jump on it around 3 to 4 k it feels like the car either runs out of fuel or spark. I had the kb BaP wepon x coils along with the basic mods. I need a tuner who can help me out. I had the wepon x coils removed because they thought that was the problem, so they put the stock ones back in and the same problem occurs. Also do I need a bigger alt because I am running the 30a BAP. want to use the coils but wepon x said they draw to much for a stock alt. Where can I get a bigger alt?

Click to read more...

 

[Zack]

I had the same symptoms in my Eaton powered MArauder and it was the FRPS.

 

[avmech]

ok school me, FRPS?

 

[cobrafreak34]

it might be the plugs not gapped wrong my nieghboors 350 had wrong gap and sounds like same shit.

 

[gnxs]

hope you guys can help me out. went to Sutton to have a tune done. car runs good but for some reason every now and then it stumbles. I can roll into it or jump on it around 3 to 4 k it feels like the car either runs out of fuel or spark. I had the kb BaP wepon x coils along with the basic mods. I need a tuner who can help me out. I had the wepon x coils removed because they thought that was the problem, so they put the stock ones back in and the same problem occurs. Also do I need a bigger alt because I am running the 30a BAP. want to use the coils but wepon x said they draw to much for a stock alt. Where can I get a bigger alt?

A few things that come to mind.

1) I thought my KB BAP was a 40A, not a 30A. Whichever unit they sell with the higher amperage is the one recommended for our cars.

2) Did they wire the BAP to still work off a boost signal (with a Hobbs switch) or did they wire it up full-time. Mine is still using a Hobbs switch and you'll find a hesitation in certain roll on/rpm situations when it's hooked up that way. It's very noticeable with the KB Hobbs switch (which kicks in at 3 psi I believe). I bought an adjustable Hobbs switch and set it to ~7 psi which works much better.

3) If your alternator is not defective, it should supply more than enough power for your combo.

4) The FRPS could be an issue. Does the car throw any codes?


If I felt the hesitation first hand, I could probably tell you immediately if it's a BAP issue, but it's hard to tell here. If it is using a Hobbs switch setup, try this:

Find where the Hobbs switch is located and take the wires off the switch and wire them together (the BAP will be working full-time now). Try your roll-ons again and see if the problem is still there.

 

[blck10th]

Larry do you have a link or part # for the Hobbs switch you have??. I still have the one From KB

 

[gnxs]

Larry do you have a link or part # for the Hobbs switch you have??. I still have the one From KB

Jimmy, I believe I bought it off E-Bay. Has a little hex screw for adjustment.

 

[blck10th]

Thanks Larry

like this one http://cgi.ebay.com/NEW-HOBBS-PRESS...14&_trkparms=72:1240|66:2|65:12|39:1|240:1318

 

[avmech]

no they took the switch off of the car. Wired it direct. the hesitation feels like its the traction control, but the traction control is always off. the car threw one code and that was on the first start up and the code was a 1233 code. cleared the code and it has never come back. beating my brains out over this

 

[gnxs]

Thanks Larry

like this one

http://cgi.ebay.com/NEW-HOBBS-PRESSURE-SWITCH-1-PSI-NORMALLY-CLOSED_W0QQitemZ180307976107QQcmdZViewItemQQptZBI_Automation_Components?hash=item180307976107&_trksid=p3286.c0.m14&_trkparms=72%3A1240%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318

That's not the one I have, but it looks like that'll work...yes.

 

[avmech]

so its probably not the tune right. I found a fuel leak figured that might be the problem. after new o rings problem still happens. only thing that bothers me is that it is a intermitten problem.

 

[batman]

I guessing spark...

 

[avmech]

i changed plugs and went back to stock coils problem got better but it is still intermiten

 

[Randy@SuttonHp]

hope you guys can help me out. went to Sutton to have a tune done. car runs good but for some reason every now and then it stumbles. I can roll into it or jump on it around 3 to 4 k it feels like the car either runs out of fuel or spark. I had the kb BaP wepon x coils along with the basic mods. I need a tuner who can help me out. I had the wepon x coils removed because they thought that was the problem, so they put the stock ones back in and the same problem occurs. Also do I need a bigger alt because I am running the 30a BAP. want to use the coils but wepon x said they draw to much for a stock alt. Where can I get a bigger alt?

Please Pm or e-mail me your contact info
I will have Jerry our tuner contact you first thing monday.
Thanks
Randy

 

[SLASH]

doug is the man at sutton, and im sure will fix whatever is wrong..

 

[avmech]

Doug got the boot from Sutton for some reasion. he was always good to me. Not sure who to deal with now.

 

[Randy@SuttonHp]

As everyone know the car business is very slow. Doug was laid off. Doug is a great employee. For the time being Jerry (our tuner) and Bryan (also a HP full time employee) will be answering all calls and emails.

 

[JeffsLightning]

As everyone know the car business is very slow. Doug was laid off. Doug is a great employee. .

Ouch....that sucks..

 

[Curt]

TR6 Plugs cause stumbles all the time in some cars......it may not be all of your problem but I would definitley use tr7ix. For some reasons the TR6's cause major misfires in some cars.

 

[about2bite]

Hmmm.... Possibly belt slip?
Or more than likely spark blow out? If you replace the plugs and the gap is still too wide it will still cause a hesitation.


I have the TR6's and am at 19#, they work great. The TR7's will last longer.
Make sure your gap is set where it needs to be, spark blow out will cause what you are describing. I replace mine every other oil change just because they are cheap and simple to replace.

 

[avmech]

yeah Sutton is going to help me out, as soon as I can get them the car lol dam weather sux's. They have been very receptive to my problem. ill check the plugs again. I know its not belt slip because I have a cog system on.

 

[about2bite]

That's gotta be loud.

How much boost are you running and where are they gapped at?
FWIW I am gapped at .032 and am running 19#'s on the NGK TR6 coppers with no problems what so ever. I also was having some hesitation a long time ago bc the gap had opened a bit and the spark was gettting blown out.