my 302 won't run right
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 47
Likes: 0
From: Iron County MO
my 302 won't run right
ok just so every one can ridicule me i got an 88f-150 i blew up and got a dirt cheap ho 302 for the replacement. i tried running the stock speed density first but it wouldn't run the motor right..... you timed it and it would idle ok and come up off idle sounding great till you put a load on it and it would backfire so every one told me go carb. i have now and got it all set up or so i thought. put an edelbrock 650 on it and got the fuel pressure down. i put a two wire dist on it with the stock coil(a hot wire run to the coil and tied into one of the wires) now it fires up and idles good and sounds ok so i timed it to 10 degrees advanced but when you rev it up it sounds like a 6 cylinder and backfires into the carb. i tried changing the base time any where from 0-20 degrees advanced. thought i wasn't getting a good 12 volt source so i wired it up straight to the batt and still doing it. double checked the firing order and it's right so i'm at a loss. hope some one can help me out.
Posting Guru
Joined: Mar 2002
Posts: 1,876
Likes: 6
From: Wolfforth
ok just so every one can ridicule me i got an 88f-150 i blew up and got a dirt cheap ho 302 for the replacement. i tried running the stock speed density first but it wouldn't run the motor right..... you timed it and it would idle ok and come up off idle sounding great till you put a load on it and it would backfire so every one told me go carb. i have now and got it all set up or so i thought. put an edelbrock 650 on it and got the fuel pressure down. i put a two wire dist on it with the stock coil(a hot wire run to the coil and tied into one of the wires) now it fires up and idles good and sounds ok so i timed it to 10 degrees advanced but when you rev it up it sounds like a 6 cylinder and backfires into the carb. i tried changing the base time any where from 0-20 degrees advanced. thought i wasn't getting a good 12 volt source so i wired it up straight to the batt and still doing it. double checked the firing order and it's right so i'm at a loss. hope some one can help me out.
also, on a side note, you don't need a 650cfm for a 302. if you pulled it out of the box and put it on you're going to need to lean it out probably with a jet and metering rod change. also, the stock springs in there SUCK. you'll probably need to get a tougher one *comes in the calibration kit for your carb model* but not the toughest unless you have AWESOME vacuum because that rod will always be up and your mileage will be cut nearly in half.
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 47
Likes: 0
From: Iron County MO
i do have it wired for the "351" order. it's a high output motor. i've had it on the original 302 order and it won't hardly turn over much less start! some one i talked to suggested making sure my timing pointer is right as if it's not i'm not getting it timed right. i think it's something in the dist though cause it sounds right idling and when you rev it up it's like the dist can't keep up with the motor. i put the truck in 4 low and it works fine for the most part but in 2wd it back fires............
Posting Guru
Joined: Mar 2002
Posts: 1,876
Likes: 6
From: Wolfforth
check your timing advance... when i first bought mine the vacuum wasn't connected at all. she was sluggish and pretty useless. i don't know if that wld cause it to backfire but that might be another place to check.
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 47
Likes: 0
From: Iron County MO
ok so i had the wires in the right order but inthe wrong direction. i put them on clock wise instead of counter clockwise. but now it won't stay runnin when i got it in time and has no power when you try to take off?
Trending Topics
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 47
Likes: 0
From: Iron County MO
1. i had the firing order right when i had the efi on the engine and it would time but the ecm wouldn't run it because of the cam!
2. i have spend around 500 on a carb and dist and all.
3. i know it can be done and wanna do it. it's all about new experiences for me. if you don't wanna give advice and help i understand that it's not everyones cup of tea.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
to advance the timing are you turning the dist clockwise or counterclockwise? if i recall on a carbed setup doesnt these motors run with less timing then an efi setup would so for instance with efi 10*btdc but with carb what should it be at im not sure? I would turn the motor over by hand and make sure cylinder 1 is at tdc (thats the first cylinder on the passenger front of motor). then look to see that the balancer is on zero and the pointer line up. then pull dizzy cap and see where the rotor is pointing.
Posting Guru
Joined: Sep 2005
Posts: 2,238
Likes: 0
From: Kiefer, Northeastern Okla
10* initial, spout disconnected from the dizzy and plugged., is right for carbs too. Sounds like a vac. leak to me. At idle, spray some carb cleaner, starting fluid, etc. around the base of the carb and intake. SLOWLY and CAREFULLY! If the idle changes, that's it. Check all vac. hoses for cracks, and -duh- make sure you have the vac. advance hooked to the right spout off the carb, and all that aren't being used are capped.
Pete
Pete
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 47
Likes: 0
From: Iron County MO
ok i was pretty sure 10 degrees was right but wasn't totally positive. as i said i had the wires on in the right order just put on in the wrong direction from #1. now i have that right and changed a couple plugs out since they were washed out. i didn't move the dist any and put #1 wire back where is was before when it was timed right and can't get it to run much below about 20 degrees advanced. i have wondered about the vaccum leak and will check it out. do you know which spout for the vaccum advance is right? i have it on the one that only pulls vaccum when the motor goes up in rpms not the one that has vaccumm all the time. i'm gonna try to work on it again this weekend. as i said i know it can be done i'm just not getting something right.... i'll get it figured out though.
Elder User
Joined: Nov 2004
Posts: 874
Likes: 0
From: Ashland, KY
I'm looking at the same problem you are except my motor is good. My 302 runs with the vacuum advance off or plugged up. It will not run with it plugged in. Well it will run but will not take gas at all. I was hoping to get some more idea's from this b/c this is the closest I have come to someone having the same problem. I still think it is in my timing somewhere. I'm going to go at it again this weekend. I have put this truck in time and pulled the distributer out so many times it's not funny. Don't get me wrong I like to work on my truck but this is getting old. It worked fine on my 70 302. I put it on my 91 302 and it won't work at all. I'll get back with you guys later this week, if you all have anymore idea's please let me know. My last resort is taking it to a garage but it looks like it is going down that road.
Thread
Thread Starter
Forum
Replies
Last Post
JeepScrambler
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
Oct 24, 2014 10:18 AM
jbancroft
1973 - 1979 F-100 & Larger F-Series Trucks
3
Jan 20, 2014 09:13 AM
quakerj
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
16
Aug 31, 2013 08:06 AM
pintoches
1978 - 1996 Big Bronco
14
Oct 27, 2012 07:29 AM
albcasummit
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
15
Mar 3, 2006 01:48 PM
