Spark Blow Out???

TYHOGG

TYHOGG

Active member
Trying to track down my problem. When i get around 15psi the truck keeps moving but it feels like it has no power, if i let off the gas and feather back into to it, it pulls good up to around 10/12 psi, any higher and it does it again. I am running tr55's on vortec gapped at 25 thousands (I think, whatever the stock gap is). Does spark blow sound like the problem?
 
sytyguy

sytyguy

Moderated User
Re: Spark Blow Out???

Have you verified no knock retard via Datamaster/TunerPro? If not, do so. Having a bunch of timing pulled out can "feel" like spark blow out, etc....
 
TYHOGG

TYHOGG

Active member
Re: Spark Blow Out???

Last time me and dennis had tuner pro hooked up it had no knock.
 
sytyguy

sytyguy

Moderated User
Re: Spark Blow Out???

I've seen spark blowout on a few occasions but usually not at 15psi or with a gap already tighter than .028. What do the AFRs look like when it hits this "wall"? If that section of the tune is pig rich, it can make it fall on it's face as well.
 
sytyguy

sytyguy

Moderated User
Re: Spark Blow Out???

A weak coil could allow spark blowout at relatively low pressure as well. Got a spare to try?
 
TYHOGG

TYHOGG

Active member
Re: Spark Blow Out???

I will check the afr's tomorrow. I'm running the msd replacement coil with 6a box. I check the box and its working perfectly. I do not have an extra coil handy (sold the extras, oops), but i have been looking for an excuess to upgrade to a HVC series. I'll let you know tomorrow. Thanks Mike.
 
TYHOGG

TYHOGG

Active member
Re: Spark Blow Out???

Forgot about the thread. Anyways, 0 knock all the way through. Afr's are holding right at 10.7 WOT. I'm going to try moving the timing around in tuner pro (pulling it down some). and maybe screw with the fuel pressure lean it up a bit. I turned the meth off till i get this sorted out.

Using Tuner Pro.
 
TYHOGG

TYHOGG

Active member
Re: Spark Blow Out???

Alright regaped the plugs just to make sure. Took a bunch of timing out in Turner Pro and now it pulls like a freight train! Still need some fine tuning but all the power is there.
 
sytyguy

sytyguy

Moderated User
Re: Spark Blow Out???

TYHOGG said:
Alright regaped the plugs just to make sure. Took a bunch of timing out in Turner Pro and now it pulls like a freight train! Still need some fine tuning but all the power is there.
Click to expand...
Not sure why it didn't show on datalog but that much retard can feel like spark blow out. Glad that fixed it. :tup:
 
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