Got a problem, need your advice

[zimmer0924]

My car has developed a stumbling/bogging down issue at low RPM's.
If the car is sitting and I try and rev it a little it starts to choke out.
So I've started with the simple stuff and worked my way up. I got new TR6 plugs, new fuel filter, coil packs, cleaned the mass air meter, cleaned the IAC, basically all sensors.
After all that the problem still remains. The car has a start up tune for my 3.4 I got from Bob before he left. Could it be a problem with that tune?
If any one can shed some light on the issue please let me know. And feel free to ask me any questions.

Thanks to all

Click to read more...

 

[03GTGreen]

Maybe FRPS

 

[Zack]

Its probably a load value thats off, or the manifold volume value needs adjusting.

The manifold volume value is like an accellerator pump found on carburetors, only electronic.

 

[zimmer0924]

Its probably a load value thats off, or the manifold volume value needs adjusting.

The manifold volume value is like an accellerator pump found on carburetors, only electronic.

Is there a way to adjust this in my Diablosport Zack?

 

[zimmer0924]

Maybe FRPS

Do you know of a way to test these. I had replaced mine about a year ago, so hopefully its not bad.

 

[Zack]

Is there a way to adjust this in my Diablosport Zack?

Im not familiar with DiabloSport, sorry.

Did you say this just started happening? Or has it been there since you loaded the tune?

 

[zimmer0924]

I plan on getting this thing tuned at Norm's, but i wanna make sure that this is not a serious problem first. I would hate to bring my car there and have to turn around and go home. If its a problem with the tune that would be great, but i don't know.

Thanks again.

 

[zimmer0924]

Im not familiar with DiabloSport, sorry.

Did you say this just started happening? Or has it been there since you loaded the tune?

It all started after I installed the 3.4 Whipple, but before i started the car I uploaded Bob's "start up tune" first.
The car seems to be running really rich if that means anything.

 

[Zack]

It all started after I installed the 3.4 Whipple, but before i started the car I uploaded Bob's "start up tune" first.
The car seems to be running really rich if that means anything.

Its probaby what I said it is.

If you have good vacuum readings and the fuel supply is A-OK, get it dyno'ed

Make sure that belt is TIGHT.

 

[zimmer0924]

Its probaby what I said it is.

If you have good vacuum readings and the fuel supply is A-OK, get it dyno'ed

Make sure that belt is TIGHT.

Will do. Thanks Zack

 

[Zack]

If you can slide the belt over the last pulley when installing, find the next shorter belt and bring it with to the dyno.

My 2.3 at 22psi slipped and Bob taught me that its usually not tight enough unless you unbolt the blower pulley, wrap the belt around it, release the tensioner, then bolt the blower pulley back on. Voila! No more slip.

 

[SONICobra]

im interested to see what you make for power, kind of wish i went that route vs. turbo... how much boost you planning on running?

 

[zimmer0924]

im interested to see what you make for power, kind of wish i went that route vs. turbo... how much boost you planning on running?

Yeah im glad i changed back to a supercharger. Im hoping to push 24lbs-26lbs if my fuel system allows it. Not having a return system and running E85 like I want is really holding me back. Ill save that for next summer.

 

[SONICobra]

were you turbo before? its not so bad, just all the god damn growing pains... should be a sick set up when youre done :headbang:

 

[Zack]

Yeah im glad i changed back to a supercharger. Im hoping to push 24lbs-26lbs if my fuel system allows it. Not having a return system and running E85 like I want is really holding me back. Ill save that for next summer.

You are throwing your money out the window.
Cancel the dyno, put the right fuel system on it.

Do it right....the FIRST TIME!

 

[zimmer0924]

You are throwing your money out the window.
Cancel the dyno, put the right fuel system on it.

Do it right....the FIRST TIME!

I really could care less right now about that. I plan on doing that over the winter. I have not driven my car in over a year, i just want to drive it right now. If i can make about 650hp on 93 i will be happy for this summer.

Thanks for the input.

 

[zimmer0924]

were you turbo before? its not so bad, just all the god damn growing pains... should be a sick set up when youre done :headbang:

Yeah about a year and a half ago. Ran a single 78mm Precision Turbo.
I think it put down about 693hp on 16lbs or 18lbs. I don't recall the torq #.
I did not like having no torq on the low end. Kicked in at 3,000-3,500rpm with a 86 hotside.

Thanks for the kind words.

 

[blownstang]

Its the tune. Mine pretty much developed similar symptoms after it was tuned. The 02's had to be delayed an extra 30 seconds to heat up properly.

 

[zimmer0924]

Its the tune. Mine pretty much developed similar symptoms after it was tuned. The 02's had to be delayed an extra 30 seconds to heat up properly.

Thank you. That makes me feel a lot better.

 

[Sharkster]

Come to think of it mine did this for about 3-5 days before the FRPS took a shit. It actually didnt completely go out, just ran like crap until I replaced it.

 

[zimmer0924]

Come to think of it mine did this for about 3-5 days before the FRPS took a shit. It actually didnt completely go out, just ran like crap until I replaced it.

Do you know how to test these?

 

[Sharkster]

Do you know how to test these?

Im not really sure if there is or not. I noticed it start to fall on its face and stumble. Pulled over and it idled like crap. On a whim I swapped that out in some parking lot of a titty club in Rockford and she was good to go. (no I wasnt at the titty club) I was always smart and carried a spare one with me. I think I got one from someone on here for like $50 and kept it in the glove box. It kept me from getting stranded in Rockford. Well just in the time it took for the car to cool down.
You can probably get a good deal on one from Tousley Ford in Minnesota. SVTPerformance vendor. Make sure you carry the correct tool or it. Odd some are small hex head bolt to get off and some allen wrench.

 

[zimmer0924]

Im not really sure if there is or not. I noticed it start to fall on its face and stumble. Pulled over and it idled like crap. On a whim I swapped that out in some parking lot of a titty club in Rockford and she was good to go. (no I wasnt at the titty club) I was always smart and carried a spare one with me. I think I got one from someone on here for like $50 and kept it in the glove box. It kept me from getting stranded in Rockford. Well just in the time it took for the car to cool down.
You can probably get a good deal on one from Tousley Ford in Minnesota. SVTPerformance vendor. Make sure you carry the correct tool or it. Odd some are small hex head bolt to get off and some allen wrench.

Thanks for the help.

 

[Sharkster]

And get a Kenne Bell FRPS fuel damper disk to put in there to keep it from spiking and puncturing the diaphram in there. $10 or $15 from kenne bell. Call them and you will have it in few days.