I just got my T/A out for the spring, it hasn't ran since the last nice day in December. Well I got it started and let it idle up to operating temperature then shut it off and check all the fluids and such. The I start it again and was going to adjust the timing and minimum air setting and a few other things, then it happened.
I heard a pop coming out of the exhaust. every few seconds I head a slight pop, not to loud but audible. Now I dont hear anything up at the engine and I don't see the tach jumping or anything like that.
I just want to know if this is serious and what could it be. a Broken valve spring maybe?

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FOR SALE!!!!!!!!!!!!!!!
86 Trans Am 355 TPI Rebuilt 700R4 with Corvette servo, modified valve body, and a B&M Torque Converter (2000 rpm stall w/ lock up), 87 350 block bored .30 with new crank. Reworked 305 heads with 3-angle valve job. Added in the rebuild was an SLP TPI cam, BBK 58mm Throttle Body,MSD 6A, Hypertech Power Coil, 1.5 Crane roller tipped rocker arms, SLP Intake Runners and Port matching in upper intake including fully ported plenum, TPIS adjustable fuel pressure regulator @ 46psi, Hooker shorty style headers w/ Thermotech heat wrapping, Custom 3” exhaust with Flowmaster muffler and chrome quad tips, Hypertech Thermomaster Computer chip, K&N open element cone filter on modified MAF per TPIS specs, MSD Wires, removal of A/C hardware and added a 1LE firewall cover installed. Also there has been a PST front suspension kit with Hotchkis strut tower brace added. Soon to have Intrax lowering springs.
http://geocities.com/SunsetStrip/Garage/9548/kyle.html

Kills:
95 Talon TSI, 96 Probe GT, 91 T/A L98, 89 RS, 86 Mustang GT, 88 Mustang LX 5.0, 92 Thunderbird V8. couple or ricers that I think were Civics or Preludes not sure what year, 95 Celica GT-S, 94 Chevy 1/4 ton 350, one of those NASCAR F150's

The Third Gen Will Never be Forgotten

 

Probably a fouled plug.

If it was a valve hanging open, you'd hear a loud noise every single time the engine fired, without exception. You description sounds like what happens when there's some unburned fuel in the exhaust system.

Change the spark plugs.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Sounds pretty Normal to me.

Mine makes all manner of funny pops and rattles out of the exhuast.




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

Oh yeah, I most likely have fairly fouled plugs.


RB provides the missing link...


Ding, lightbulbs!



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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

OR, it could be a burnt plug wire. My suggestion is just go ahead with a full-tuneup. I think TomP says he does one as part of his spring cleaning. Couldn't hurt even if it isn't the problem.

 

lol, mine does the same exact thing. The new cars got "Change Oil" lights, we got the next best thing, a signal of when to change the plugs/wires. I must admit though, i did always wonder why my car did that.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR

 

Hey, I am the missing link!!

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"So many Mustangs, so little time..."
ICON Motorsports