Stock timing set-backfiring

1987StangL268X · 03-28-2007, 10:10 PM

Ok i ordered a edelbrock cam edl-2221....and it said not compatible with late model timing set. Well i degreed it and it looked to come up fine...But now its backfiring like the timing is off! Do you guys think this is my backfiring/ acts like timing is off?? PLEASE help its killing me wondering, i ordered a new chain i just want to know before hand if you think that is what it is!

USMC302 · 03-29-2007, 08:37 AM

If it said it's not compatible, chances are it's not. You might have to go with a different firing order, are you sure it's backfiring and not popping from a miss?

1987StangL268X · 03-29-2007, 02:05 PM

No it shouldnt be missing, because it runs good unless it backfires, almost like the timing is off- probably meaning timing chain. My cam is the 302 non h.o. fire order. I already have the firing order right i just think it has to be that. What else could it possibly be?? I ordered a dist. to

USMC302 · 03-29-2007, 02:40 PM

1st, just because it's back firing, doesn't mean your timing chain is messed up . The timing chain is standard for both stock and aftermarket cams with exception to different placements of the lower cam sprocket for advancing or retarding the camshaft itself. Unless the chain is extremely stretched out, the timing issue is NOT from the chain. Did you install it straight up? You might have installed th dist 1 tooth off or at 180 degrees off, the car will run like that but not too well. Pull the dist out, set the #1 piston to TDC, you can see this with the spark plug out and a flashlight. Once it's at TDC, drop the dist in with the rotor pointing to #1. Set your timing to 10 degrees and go from there. This is the warning you are referring to most likely.

CAUTION: Use Edelbrock Performer-Link Timing Chain and Gear
Set #7811 or Accu-Drive gear drive #7892. Do not use late
model timing chain and gear sets that are designed for emissioncontrolled
engines. These timing sets are machined in a retarded
position and are not recommended for this camshaft installation.
Edelbrock Timing Sets feature three keyways for specified timing
selection. Use "0" position for most applications.

That "0" position they are referring to is the straightup position, which is going to be almost the exact same as straightup on the stock chain. Try resetting the TDC and let us know.

goodyear1984 · 03-30-2007, 10:23 PM

hey just an fyi for u if u have a efi ho motor and your useing the non ho fireing order u will have problems with popin because the injectors are firing with the ho order of 1-3-7-2-6-5-4-8.and not the non ho order 1-5-4-2-6-3-7-8...like usmc said the chain wont cause a problem unless its sloppy or not lined up right....so any ways if u do have the efi ho and u put the non ho order cam in it plan on swaping that cam out again if u want it to run right ...and to answer the question befor its asked you cant re wire the injectors it wont run right

USMC302 · 04-06-2007, 07:39 AM

Well??......

Gearhead999 · 04-07-2007, 09:06 AM

You have a lot of good advice given above. The chain isn't your problem.

You said you degreed it....if you did and it came out OK then it isn't retarded, unless you used a different chain set to degree it then you used to run it.

Look elsewhere. Start with firing order, intake leak, etc.

"No it shouldnt be missing, because it runs good unless it backfires"

Love this statement....

03-29-2007, 08:37 AM	#2
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Stock timing set-backfiring If it said it's not compatible, chances are it's not. You might have to go with a different firing order, are you sure it's backfiring and not popping from a miss? __________________

03-29-2007, 02:05 PM	#3
1987StangL268X Registered Member Join Date: Feb 2007 Location: Tennessee Posts: 38	Re: Stock timing set-backfiring No it shouldnt be missing, because it runs good unless it backfires, almost like the timing is off- probably meaning timing chain. My cam is the 302 non h.o. fire order. I already have the firing order right i just think it has to be that. What else could it possibly be?? I ordered a dist. to __________________ 1987 mustang hatchback. weld wheels, driveshaft loop, subframe connectors,308 w/ 520 lift cam, edelbrock perf rpm alum heads 2.02 1.60 valves, 1.6 roller rockers, edelbrock air gap performer intake, roller lifters, 625 vac secondary demon, c-4 trans w 3,000 stall, 3.73 gears

03-29-2007, 02:40 PM	#4
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Stock timing set-backfiring 1st, just because it's back firing, doesn't mean your timing chain is messed up . The timing chain is standard for both stock and aftermarket cams with exception to different placements of the lower cam sprocket for advancing or retarding the camshaft itself. Unless the chain is extremely stretched out, the timing issue is NOT from the chain. Did you install it straight up? You might have installed th dist 1 tooth off or at 180 degrees off, the car will run like that but not too well. Pull the dist out, set the #1 piston to TDC, you can see this with the spark plug out and a flashlight. Once it's at TDC, drop the dist in with the rotor pointing to #1. Set your timing to 10 degrees and go from there. This is the warning you are referring to most likely. CAUTION: Use Edelbrock Performer-Link Timing Chain and Gear Set #7811 or Accu-Drive gear drive #7892. Do not use late model timing chain and gear sets that are designed for emissioncontrolled engines. These timing sets are machined in a retarded position and are not recommended for this camshaft installation. Edelbrock Timing Sets feature three keyways for specified timing selection. Use "0" position for most applications. That "0" position they are referring to is the straightup position, which is going to be almost the exact same as straightup on the stock chain. Try resetting the TDC and let us know. __________________ Last edited by USMC302; 03-29-2007 at 03:27 PM..

03-30-2007, 10:23 PM	#5
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: Stock timing set-backfiring hey just an fyi for u if u have a efi ho motor and your useing the non ho fireing order u will have problems with popin because the injectors are firing with the ho order of 1-3-7-2-6-5-4-8.and not the non ho order 1-5-4-2-6-3-7-8...like usmc said the chain wont cause a problem unless its sloppy or not lined up right....so any ways if u do have the efi ho and u put the non ho order cam in it plan on swaping that cam out again if u want it to run right ...and to answer the question befor its asked you cant re wire the injectors it wont run right __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

04-06-2007, 07:39 AM	#6
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Stock timing set-backfiring Well??...... __________________

03-28-2007, 10:10 PM	#1
1987StangL268X Registered Member Join Date: Feb 2007 Location: Tennessee Posts: 38	Stock timing set-backfiring Ok i ordered a edelbrock cam edl-2221....and it said not compatible with late model timing set. Well i degreed it and it looked to come up fine...But now its backfiring like the timing is off! Do you guys think this is my backfiring/ acts like timing is off?? PLEASE help its killing me wondering, i ordered a new chain i just want to know before hand if you think that is what it is! __________________ 1987 mustang hatchback. weld wheels, driveshaft loop, subframe connectors,308 w/ 520 lift cam, edelbrock perf rpm alum heads 2.02 1.60 valves, 1.6 roller rockers, edelbrock air gap performer intake, roller lifters, 625 vac secondary demon, c-4 trans w 3,000 stall, 3.73 gears

04-07-2007, 09:06 AM	#7
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Re: Stock timing set-backfiring You have a lot of good advice given above. The chain isn't your problem. You said you degreed it....if you did and it came out OK then it isn't retarded, unless you used a different chain set to degree it then you used to run it. Look elsewhere. Start with firing order, intake leak, etc. "No it shouldnt be missing, because it runs good unless it backfires" Love this statement.... __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

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