eddie89TA

i installed new edelbrock 6085 heads and high flow intake with my slp runners, starts right up but when it tries to settle down begins to pop back up through intake when i give it throttle it runs fine, i replaced MAF, tripple checked timing, wires, iac, tps and hit the intake with propane and no vacume leaks no check engine light, even double checked valve lash and its fine no bent pushrods at all, i feel the concussion in the intake the plennum to be exact the best it will do is BARELY idle but still pops up through intake, also my new maf still has the screens so i know i didint damage it. man i am lost .:hail: thereat of the combo is unchanged

wako29

whats a "performance resource chip"?

maybe you need a new chip burnt because of your new mods.......
I'm just throwing out ideas

onebinky

iTrader: (1)

When you check with a timing light, what's the base timing set at? When you plug the module connector back in, what does timing jump to? Should only be about 20 deg. total at idle, and 6 deg. base.

Once you start getting into the heavier mods, really the only way to go is to pony up the couple hundred bucks and start burning your own chips. You'll save money over the mail order chips, and without logging data on your specific vehicle, there is no way to accurately gauge what your motor needs.

eddie89TA

with the brown wire disconnected i got it set at 4 DEG advance, for some reason .....after sweatin all night i feel its a timing/ wires mixed up problem, i am gonna remove wires from distributer and check again the firing order . even if i advance the timing it still acts up? it ran dead perfect with the above combo, all i did is head and base swap... compression is about 9.8 to 1 now if that helps. from 9.3 what else would back fire through intake if not a wires/ timing.

man.. mods are like crack you know it might hurt but ur hooked and u do it anyway

anesthes

iTrader: (12)

All you did was a head an base swap? Dude, you got a new motor!

Whats the new compression ratio with the heads, or were they the same chamber size?

Also check for vacuum leaks.

-- Joe

eddie89TA

well.. just checked wires and firing order and they all match up. could it be fuel pressure? when i remove the MAF ducting from the throttle body it goes into pig rich limp home and runs bit better, but at crazy high idle, i am about 43 psi i have the AFPR bucked off all the way up. could it be going lean at idle? would this make it pop? just throwing things out there.

engine now has 35k miles on the block

eddie89TA

went from 67 to 60 cc , stock is 64cc .with a felpro .040 compressed thickness gasket per Edelbrock recomendations.

eddie89TA

well turned out the bolts from the bottom of the runners to the edelbrock base were bottoming out. causing a horendous vacume leak. solved all that... did some adjustments: iac, tps, timing. and bam! greeted to a nice 750 rpm american V-8 rumble (made me wanna sing, "oh say can you see, by the dawns early light") anywayz well worth the 3 weeks of headaches. through all my research on here i never heard of that problem with the edelbrock base with SLP runners.

broken305Z

Hey Eddie, care to elaborate on that??
If its been beat to death (email it to me) sorry I have never heard of it.
Thanks man I have a pretty similiar situation I am dealing with right now and its driving me nuts

onebinky

iTrader: (1)

It's a method of artificial enrichment. If you have a vacuum leak, the propane will get sucked into the manifold and the RPM's will go up (or down, depending on state of tune). If you have no leaks, RPM's will remain steady. You could use ether, or really anything that is flamable.

72LT1VETTE

Sometimes "artificial enrichment" just don't work as good as the old smoke injection test.

onebinky

iTrader: (1)

Now this one I'm not familiar with

Care to share?

eddie89TA

yep like said above^ i use propane or even a a spraybottle with gas. around any "suspicious" areas and in my case the rpm's will rise about 2-300 for a moment. then u can pinpoint a leak. hope this helps. by the way can some one run my combo through desktop dyno to give me an estimate of power?

eddie89TA

the numbers listed are from the old combo at the top.

72LT1VETTE

Smoke in a spray can. Normally used by heating and AC repairmen. Spray slowly around intake while watching the exhaust and smoke flow trail. NON-EXPLOSIVE as gas or propane and sparks.

onebinky

iTrader: (1)

Very cool, so you can actually see the smoke getting sucked into the engine?

I'll have to look into that. Any idea where I can get it and how much it costs?