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Offline TurboCajun

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Back Fire
« on: October 20 2015, 03:07:59 PM »
The Friday before I left to go to Cruising the Coast I took the car for a ride, everything seemed good until I nailed it after turning a curve and the car backfired, I got out of it and headed home, started checking the scan master and seen the Voltage was under 12v. so I was figuring that was the problem, started testing battery and ALT. . the Alt would drop voltage after running awhile. cold starts it was at 14+,
I tried to get a replacement from Oreilly but it didnt arive in time so I took my chances and headed to CTC. Everything worked great on the way there. The next day just cruising around the Volts started dropping. One of my friends from MISS. had a ALT. he could not use with his setup, so he sold it to me, later that night we changed it out, steady 13.9-14 volts. so we are good. This past Saturday night I leave a car show ( Got a peoples choice award  :rock: ) , I got into the gas and the sum bitch backfires on me again, volts were 13.9 , so maybe I have some other problem. I havent had time to check over anything yet. Just posting for any ideas for when I do have time to check. Thanks.
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Offline gusszgs

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Re: Back Fire
« Reply #1 on: October 20 2015, 06:16:11 PM »
How old is your coil pack? I just went through the exact issue you have a few weeks back and I ohm'd the coil pack. Readings were way high. Replaced it and with a set of NGK's and it pulls like a freight train.
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Offline Steve Wood

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Re: Back Fire
« Reply #2 on: October 20 2015, 09:39:01 PM »
X2...that's the first thing I would check
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Offline TurboCajun

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Re: Back Fire
« Reply #3 on: October 21 2015, 09:53:38 AM »
Its prob 5-6 years old, I have spare here that I will try , thanks

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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline gordyzx9r

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Re: Back Fire
« Reply #4 on: October 21 2015, 03:04:50 PM »
I might have to go to Baton Rouge next week, I have a http://www.casperselectronics.com/store2/product_info.php?products_id=607 I can bring with me if you want to try it out.
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Offline Steve Wood

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Re: Back Fire
« Reply #5 on: October 21 2015, 08:40:47 PM »
just ohm across the coil packs and see if the resistance is 11-13k on each one
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: Back Fire
« Reply #6 on: October 22 2015, 09:12:41 AM »
Gordy
I would not want you to go thru the trouble. I will OHM this one , and like i said I do have a spare. Thanks anyway.

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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TurboCajun

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Re: Back Fire
« Reply #7 on: December 08 2015, 10:13:26 AM »
finally got a chance to do some work on the car, first thing I changed was the coil pack, started the car after and all seemed well there was no more lights blinking and fuel pressure gauge flickering. so I am assuming the other pack was bad even with it OHMing out at 11k.


Question - the car had back fired three times and I am just wondering what kinda damage it could had caused, It seems like I have a ticking noise on the passenger side and cannot tell if its an exhaust leak or lifter/rocker noise. also seem like I would be having crank case pressure because I have more oil coming from valve cover breathers and even some coming out of the valve cover bolts. car is not smoking, just bleeding oil more.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Scoobum

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Re: Back Fire
« Reply #8 on: December 08 2015, 05:16:36 PM »
I have 3 good used coil packs...and I never ohm'd them. How do I know their good? Cuz I took 'em down the track...and the car pulled like a freight train. Same goes for the 3 spare ignition modules I have. :) If they survive in high gear under load at WOT through the traps...then they get a passing grade from me. :)

Keith...how long has the crankcase been pressurizing?

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Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

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Offline TurboCajun

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Re: Back Fire
« Reply #9 on: December 09 2015, 02:00:53 PM »
about 100 miles ago, after 2nd backfire i quess
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Scoobum

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Re: Back Fire
« Reply #10 on: December 09 2015, 05:46:17 PM »
I reread your post. You say you have MORE oil coming out the breathers. Have you always had SOME seepage from the breathers? I'd do a compression or leak down test. Any idea what the piston to wall clearance and rings gaps were set too?
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Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

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Re: Back Fire
« Reply #11 on: December 09 2015, 10:15:27 PM »
leak down would be my suggestion as well.  broken ring?
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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: Back Fire
« Reply #12 on: December 14 2015, 10:48:34 AM »
yes there has always been some oil coming from the breathers, I guess I could call Weber to find out the clearances. I put in my request for a leak down tester  for X-mas.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline poppy1440

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Re: Back Fire
« Reply #13 on: December 14 2015, 05:37:37 PM »
Keith,  I have a leak down tester you can borrow.
I'll meet you in baton rouge if you want to use it
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Offline Scoobum

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Re: Back Fire
« Reply #14 on: December 14 2015, 05:58:46 PM »
Quote from: TurboCajun on December 14 2015, 10:48:34 AM
yes there has always been some oil coming from the breathers, I guess I could call Weber to find out the clearances. I put in my request for a leak down tester  for X-mas.

Keith, I've never had a drop of oil come out the breathers in the two engines Joe has built for me. I'll hit Joe up for what brand he uses for rings and the ring gaps he uses.
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Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon
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