I HAVE A BIG PROBLEM. I OWN 1 1ST GEN. IT HAS A FULLY WORKED 12 A. WERE TALKING STREET PORT, HOLLEY 650, HIGH PRESSURE HOLLEY FUEL PUMP, UPGRADED FUEL PRESSURE REGULATOR, HIGH COMPRESSION ROTORS, LOW COMPRESSION CARBON APEX SEALS,2 MSD IGNITION MODULES WITH BLASTER COILS, HEADERS,FULL STRAIGHT PIPE EXHAUST, LIGHT WEIGHT FLYWHEEL,ETC.. I GUESS THATS ENOUGH INFO TO TRY AND FIND OUT THE ISSUE. NOW THE PROBLEM, MY MECHANIC TUNED THE CARB, AND ADJUSTED THE F.P.R., REWIRED MY MSD, ADJUSTED THE TIMING, AND CHANGED MY SPARK PLUGS. ONE OF MY COILS IS NOT RECIEVING SPARK, THEN WE SWITCHED THE COILS AND IT WORKED BUT THEN STOPPED. THEN WE PUT THE OLD ONE BACK AND IT WORKED AND ALSO THEN STOPPED. THE CAR TURNS ON LIKE A CHAMP, JUST LIKE IF IT WAS FUEL INJECTED. IT IDLES BEAUTIFULLY!!! BUT THE SECOND WE GO TO GIVE IT GAS IT SPUTTERS VIOLENTLY! IT SHAKES SO HARD THAT MY SHIFTER INSIDE LOOKS LIKE ITS GOING TO JUMP OUT OF THE CAR AS WELL AS THE MOTOR DOES. EVERYTHING ON THE CAR IS A PERFORMANCE PART. THE MOTOR HAS 10K ON IT. THE CAR WAS COMPLETLEY PUT TOGETHER FROM THE FRAME UP. WE HAVE NO IDEA WHAT IT COULD BE. IF ANYONE HAS ANY FEEDBACK PLEASE LET ME KNOW HERE ON THE FROUM OR BY EMAIL. FRANCISCO.A.FERNANDEZ@GMAIL.COM
THANK YOU VERY MUCH....... THIS TOPIC IS ALSO ON NOPISTONS.COM

 

The intermittent spark thing sounds like a faulty ignitor. Or the MSD may be wired wrong...

 

its the ahh hell just give me the car


+1 with adrenaline-junky

check Wiring if you still have ignitors check them 1st

 

How was it running before you had everything rewired??

 

Do you really need to shout?

 

dont have ignitors. even returned it to stock set-up and it still wont rev up past like 2,000 rpms. it shakes violently when i try to gas it. someone said maybe there is a spun bearing inside. i dont know man im running out of ideas...

 

Low compression carbon apex seals? haha, what are those

 

well thats what i was told they were called. but anyways i think that my rear apex seal is blown, well atleast thats the mechanic said.......

 

I was thinking the same thing.

 

That sucks man. now im left with put in a 12a with street port and half bridge to replace it(my boy has one) or just go 13b turbo...... i dont know, i dont want to spend too much cash.

 

If I were you tho, I would

#1-check cap + rotor / plug wires/connections
#2-check spark plugs
#3-make sure coils have a good body ground, and that the + voltage is constant during revving.

This problem sounds like one or both rotors are losing leading spark, what I would do to determine if its one or both is to start the engine, pull a single leading plug wire and rev it and see if it has even less power. If its the same once youve tried both leading plug wires, then the problem is with the whole leading ignition.

If its a single rotor, the issue is in the cap/rotor or wire to the problem plug (the one that doesnt effect anything) or the plug itself.

If both rotors are affected, then the problem is harder to pinpoint. In this case it could be the coil to cap wire, the carbon button, or contacts in the cap and on the rotor. It could also be a bad coil or triggering device (in your case the MSD).

Hope Ive been of some help.
Good luck

 

check the motor and see... you can listen for 3 swooshs or you can do a comption test... check the spark see if the plugs are sparking or not about 2k dont give up that ez

 

If your car starts like a champ, its not a blown engine.
However looking back at your post it says you have a holley 650.
It likely could be falling on its face as soon as you come off the idle circuit. Ive heard holley carbs can be a bitch, and a 650 is prety big.

 

What sucks?

I don't think you under stood what I was saying, I said "I was thinking the same thing" to the comment " what are low compression apex seals"

 

blown apex seals suck!! lol, im not sure what they are either. im fairly new to the rotary world....

 

my mechanic did that. he got 3 swooshes in the front and two in the rear. so its blown??

 

3 swooshes mean you still have an engine.

 

One side seal is blown or stuck.

 

so what does everyone think?? what would you guys do in my place????

 

Press this key.

 

A bad side seal won't cause the engine to shake violently above 2k rpm. Bad timing, ignition and/or carb tuning can.

You should be running a high volume/low pressure fuel pump. If the fuel pump is an FI rated pump, you need a return style fpr. The 650 is too big for a 12A-SP. it can be tuned to work, but a smaller carb will work better.

There is no such thing as low compression carbon seals. Carbon seals simply don't hold up well with boost or nitrous.

At this point in time, I would run a full compression test. If 5 of the 6 rotor faces are within specs, try some Seafoam to see if the side seal is simply stuck. If it loosens up and compression improves, then I would take the ignition back to stock, get the carb tuned correctly/ Once the carb and ignition is working right, then work on upgrading the ignition.

Post the results from the compression test.

 

Ya, what Trochoid said. +1

 

ill run this by my mechanic and see what he says. ill get back to you guys later today. thanks

 

30,30,30 in the front and the rear gave us 30, skip, 30. it skips a face in the rear......

 

what is seafoam though? where can i get it. ive heard of putting mystery oil in to see what happens... got more info?