302 problems
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Freshman User
Joined: Aug 2007
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From: springfield,ohio
302 problems
i bought a truck with a 302 in it with whats supposed to be a 87 HO motor it has a torker intake 600 holley unknown cam could be stock in it stock distibutor msd box we tried both firing orders for it and it back fires thru carb still it wont even start at all do u guys think the timing is wrong? im stuck right now
any help is appreciated thanks
any help is appreciated thanks
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
i bought a truck with a 302 in it with whats supposed to be a 87 HO motor it has a torker intake 600 holley unknown cam could be stock in it stock distibutor msd box we tried both firing orders for it and it back fires thru carb still it wont even start at all do u guys think the timing is wrong? im stuck right now
any help is appreciated thanks
any help is appreciated thanks
What did the 302 come out of?
Cause if its a 1987 HO motor most likely out of a mustang and it would have been a fuel injection engine. But I see it has a carb on it though. So if the engine doesnt run I would check the sparkplug order on the cap.
A plain 302HO has the same firing order as a 351W and its as follows.
1-3-7-2-6-5-4-8
Check the dist cap make sure its correct. If so considering its back firing I would bring up Cylinder #1 to TDC on compression stroke (pull #1 plug and tap the engine over till you feel your tumb being push away from the plug opening to indicate its on the compression stroke), pull the cap and see where the rotor is pointing. Odds are you are around 180* off on timing which means your engine is firing when the intake valves are open or opening causing the back fire through the intake.
One question when you turn the engine off does it try to keep on running?
That is one side effect that doesnt always happen but I have experianced it on a dist that was mistakenly installed 180* out.
Elder User
Joined: Oct 2007
Posts: 790
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From: Highland Village, TX
I would try playing with advancing the time and retarding it by turning the distributor to see if you can get it to fire with either the 302 or 351W order. If that fails you will likely have to pull the timing cover to see what the chain looks like, it may have skipped or be too sloppy. Rusty's suggestion about resetting the distributor to TDC would be a good place to start. If it wasn't running when you got it never underestimate what screwball things were done before you got it. 
Postmaster
Joined: Jan 2009
Posts: 4,558
Likes: 2
Sounds like a timing problem.. Like above .bring it up to TDC on the balencer on comp stroke & see if rotor is pointing at # 1...Are you sure its an HO..But it should start with either order just wont run right...If its 180 off it wont start..If you want to check how much slack the chain has just turn the crank buy hand till the rotor starts turning then turn it back the other way & see how far you have to turn it to get it to move..It should move as soon as you start to move it back if the chain is tight & you dont have dist problems...
Mountain Pass
Joined: Feb 2009
Posts: 173
Likes: 49
From: Louisville, KY
My brother once rebuilt an engine but decided on reinstalling the old chain. He fired her up and within a minute it shot a foot high flame out of the carb. He then replace the chain an she worked ever since. It like 53OderThanMe said, it could of slip a tooth or how sloppy the chain may be.
Dale
Ford52F2
Dale
Ford52F2
Last edited by Ford52F2; Mar 24, 2009 at 01:03 PM. Reason: Spelling typo
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Freshman User
Joined: Aug 2007
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From: springfield,ohio
yeah we took the number 1 spark plug out and it pushed my figher out when the rotor buttons pointed at it we havnt had it strted yet so it could be the timing chain cuz its supposed to be rebuilt plus whoever doned the wiring and work on the motor is an idiot the the dizzy cap backwards had plugs running everywhere and the trans that they rebuilt was busted to hell the rorque converter was demolished so yeah its a mess
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
Is possible it would run 180 off. I installed one 180 off and it ran turned the key off and the engine went dieseling and kept on running. No matter which way the dist was turned would make the engine run different. Then I realized what I did wrong.
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Senior User
Joined: Jan 2004
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From: Lancaster CA
A simple mistake is to put your wires on clockwise. Make sure they are going counter-clock, or at least in the same direction as the rotor spins. I have had one fire up somehow that way
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Hotshot
Joined: Nov 2000
Posts: 11,591
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From: Pflugerville, tx
finally got my mustang budy over and he laughed his a.. off. He left without telling me what the problem was, then came back the next day and redid the plug wires and it fired right up..
won't forget that again..!!
Sam
Post Fiend
Joined: May 2008
Posts: 7,641
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From: Poway, Ca.
Question, have you ever seen this engine run? Chances are the distributor may have been put in in the wrong position - it makes a difference that won't time out.
But also, check to make sure none of your plug wires are less than 1/2 inch from any other plug wires. You may have spark jump from wire to wire.
Cargo Master
Joined: Apr 2007
Posts: 2,063
Likes: 38
From: Valley Center, California
What they said...... The reverse on the cap is a common mistake most folks won't admit to. 
I'm guilty in my young Small Block Ford years.
If that don't get it, and you don't know the history of the engine, check the valve-train or do a compression check. Carb-Popping can be Intake valves not being perfectly satisfied......
I'm guilty in my young Small Block Ford years.If that don't get it, and you don't know the history of the engine, check the valve-train or do a compression check. Carb-Popping can be Intake valves not being perfectly satisfied......
Lead Driver
Joined: Apr 2007
Posts: 5,958
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From: Houston
lol Only mistakes ive made are installing a dist 180* off and getting two plug wires swaped around.
But I have heard of alot of people mistakenly use the regular 302 firing order on a 302 HO which uses the same firing order as the 351.
But I have heard of alot of people mistakenly use the regular 302 firing order on a 302 HO which uses the same firing order as the 351.
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Freshman User
Joined: Aug 2007
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From: springfield,ohio
Bingo! Make sure you are counter clockwise in your plug wire order and the order is correct. If you are getting back firing through the carb throat, it means you have an intake valve open when the plug fires.
Question, have you ever seen this engine run? Chances are the distributor may have been put in in the wrong position - it makes a difference that won't time out.
But also, check to make sure none of your plug wires are less than 1/2 inch from any other plug wires. You may have spark jump from wire to wire.
Question, have you ever seen this engine run? Chances are the distributor may have been put in in the wrong position - it makes a difference that won't time out.
But also, check to make sure none of your plug wires are less than 1/2 inch from any other plug wires. You may have spark jump from wire to wire.
thanks to everyone for the help
Elder User
Joined: Jan 2007
Posts: 789
Likes: 2
From: MI..."near" Dearborn...
Just a thought...
...while ya DO have the trans out...
...maybe ya might want ta roll back under the truck
and jot down the casting numbers off the block down
by the starter...just for reference...couldn't hurt...
..that way you can check and you'll know for sure exactlly
where and when this motor started out as...
...just a thought...
...
...maybe ya might want ta roll back under the truck
and jot down the casting numbers off the block down
by the starter...just for reference...couldn't hurt...
..that way you can check and you'll know for sure exactlly
where and when this motor started out as...
...just a thought...
...
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