Moejoe

iTrader: (1)

I have been chasing this issue for months. The car drives, but I can not get anything out of wide open throttle. I get a sputter at about 5K RPM's. The car will keep going, but it doesn't make any pore power.

Here's what I have done:
I have checked and replaced the plugs.
I have checked and replaced the coil packs, to include the harness.
I have checked the connection to the ignition amp.
I have tried it with and without the amp hooked up.
I have check to be sure it is not getting too much fuel.
The car has been on the dyno for about a dozen pulls with the PFC hooked up to tune on 3 occasions and it's the same thing every time.

At one time the car was doing this, but if I was WOT, it would just push past it and not sputter. At that time, it did continue to make power. I did not run it like this for very long. We thought it might be the boost controller, not regulating boost right. I put in a new one.

The set up is stock twins almost maxed out, with all supporting mods. 850 primary, 1300 secondarys. Manage with PFC.

Any thoughts guys? Thanks

bryant

how are your grounds??

wReX

iTrader: (6)

^^^ grounds? Can you try borrowing an amp from someone else and swap them out?

Had a similar problem awhile back and turned out to be an issue with the trigger wheel sensor on the front of the motor. Do some research but you may want to double check the sensor and wire leading off of it, also maybe even the wheel itself(doubt that's the problem tho). Good luck.

darkphantom

iTrader: (2)

i had the same problem with the jacobs ignition system breaking up @ 17psi when we did the dyno (see signature ). long story short the jacobs ignition burned the coils and i ended up with the msd

Moejoe

iTrader: (1)

I have been thinking it might be the ground. However, I have checked all the ones I know. Anyone have a link showing where they all are? I searched here with nothing like that coming up.

I will try swapping amps.

What the hell is a trigger wheel?

jantore

Ive had that problem before, and it took a while to figure out. My ingtion was too weak. Now im running Crane Cams LX92 coils with a Autronic 500R CDI box and NGK B11EGV plugs and im not getting any ignition break up.

Oh and another thing u can check out is to see if your initial timing is correct. If it's off by 10-15 degrees u will get the symptoms u have. And don't use stock plugs if that's what ur using.

JT

Qball

i had the same problem until i replaced all the plugs and put in a twin power ignition amp.

the reason i suspected it was weak ignition is because the car would stumble at high boost where the mixture is harder to ignite but it would be perfectly fine at the lowest boost setting.

Moejoe

iTrader: (1)

I have a twin power amp on the car now. I have replaced plugs many times, with this issue still there. I'm using NGK 9's as well.

twisted7

iTrader: (3)

try looking on alldatadiy.com you can purchase a pretty sweet manual and everything for the car. I just look and mine has expired otherwise i would just send you the link.

You can check out the OEM manual for grounding points.

Like i told you awhile ago, let logan take a look at it and it would prob be benefical to you. Even if you have paided for tuning and stuff already i tihnk in the long run you will end up saving money.

AzEKnightz

iTrader: (24)

Make sure theres no tiny holes in the ignition wire... Because at higher rpms, if theres a tiny hole,the electronic will find it's way to jump outs before it reaches the plugs to ignite. Look for any metal near the engine bay to see if you can find any burned or metal changes near the spark plug wires... Maybe you can find something interesting. Other than that, go with what the other guy's been saying.

AzEKnightz

iTrader: (24)

If its a distributor, its the wheel on top of the distributor shaft that turns in circular motion. But from what he's saying, I have no idea

Monsterbox

iTrader: (6)

really sounds to me like something involving the fuel system....like transition from primary to secondary injectors...u do have oversize injectors

jantore

switch out the plugs with some iridium plugs, 10s or some NGK B10EGV. you will need the thinner plug socket for the B10EGV plugs tho, but they are cheap.

JT

Moejoe

iTrader: (1)

We had been blaming it on fuel for months. Turns out the 850's and 1300's are fine. So we have chased all things related to ignition now. I have not tried 10's for plugs, and shouldn't need them. This same build ran on 9's very well. However, I my just try it.
I have talked to Logan about this a while ago, he didn't know what might be, other than what I have done.

I have spent hours working on this. I don't want to spend hundreds of dollars for someone else to look at it and not find the answer. There are only so many things it can be. These are all things I can do. I'm just looking for peoples thoughts, and maybe new ideas.
I'm going to try the other plugs and maybe swap out the ignition amp.

zayrx7

check the ground on top of the block

badddrx7

iTrader: (7)

Get some Autolite AR-3933 or 34 and try them. These are racing plugs, obtained at your local Advance Auto. I run 3933 all around.

later

bryant

did you install Injector Resistors ?

Moejoe

iTrader: (1)

I'm resurrecting this thread and still chasing issues after a long break with working on the car. I just got the injectors back from getting cleaned, they were pretty bad. I up graded the grounds last year and that brought a new problem. The car won't start. I have air, fuel, and spark. The PFC is at the right settings for fuel and I flood the car when trying to start. plug's are new. And everything is hookup right and has been checked by several people. All ignition related items are about new and have been tested and checked. This car is ready to go with pretty much a new build. Pretty much looking for new ideas at this point. Anyone?

1QWIK7

iTrader: (33)

If the car was running before and not now, your only choice to suspect thats the problem would be your injectors since thats the only thing you replaced.

I would say its dumping too much fuel. I bet if you pull your plugs again you will see.

Moejoe

iTrader: (1)

My bad. I should have written that the car would not start after upgrading the grounds. I did try going back the the stock grounds, but it didn't make a difference.

samad

iTrader: (1)

i have kind of a similar problem. when i do ge 10 psi, which is some times(20psi otherwise..long story)..........after 6k rpm thers just no power! its fine in 1st gear, really bad in 2nd and somewhat alright in 3rd. i thought it would be vacume related!

Dudemaaanownsanrx7

iTrader: (23)

have you done the deflood procedure moejoe? or tried pull starting it? Checked the compression? Did the car start at all on the plugs you're running right now? What plugs are you running? Stock ngk type?

RotaryRX-007

Are we sure timing is correct? The only other thing would be that the PFC was tuned with those dirty injectors and the tune was compensating for it and now that they are clean and flow well it is still thinking that it needs the extra umph and is just dumping fuel.

Check the timing real quick and back out a bunch of fuel and see if it will atleast start.

impactwrench

What is your AFR at 5000RPM,s? I'm siding with the guys that think you are way too rich.

Dudemaaanownsanrx7

iTrader: (23)

fuel pump isnt cutting out is it? have you checked the fuel pressure