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Unread 03-03-2008, 07:22 PM   #1
atom73
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1977 CJ5 
 
Join Date: Mar 2007
Location: Kenosha, WI
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New 360 starting, wont stay running

This is a very stressfull time around my house. I have been waiting for this motor since the end of November, it got here last week and I have been diligent in my installation and taking care of its needs, it owes me a start and run. But alas it wont run... I bought a "turn-key" remanufactured 360 AMC from remaufactured.com (NEVER under any circumstances buy anything from this company), they built, ran, and timed the motor prior to shipping it. I installed it (with the usual complications, which have been mostly worked out) and hooked everything up. The first time I tried to start it, it backfired a bunch through the carb so I figured it was timing, after a little while I noticed that the 1 and 5 wires were swapped. So now, it will run and rev high (4K rpm) and then cut out. If I give it gas it will run a little longer but will not even come close to stay running on its own. It has an edlebrock performer carb 4bl, HEI dizzy, its a 77 cj5 and all the fuel system (tank to carb) was new right before I pulled the 304 out. Incidentally, the 304 was running and the jeep was very driveable prior to me removing the 304 so I have to think its something with the motor and not the rest of the vehicle. My thoughts are that: I have spark, and probably decent timing otherwise it wouldnt rev like that, I think its fuel somehow but I have no idea where to start. I did put in brand new gas too by the way. I have posted a 30s video to show what it does when I crank it. BTW, I know its leaking under the front end its a power steering couple leak. Thanks for your help.
Mike


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Unread 03-03-2008, 07:54 PM   #2
ky81cj7
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vacum leak or carb out of adjustment!
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Unread 03-03-2008, 07:59 PM   #3
John N
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Do you have a clear fuel filter on it, with that you can watch for fuel flow. If not test your fuel system by pulling the line off the carb and running it into a bottle. Can you borrow a known, good carb to try?
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Unread 03-03-2008, 08:07 PM   #4
atom73
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I am going to get a clear fuel filter, good suggestion. As far as the carb goes, I bought it new and it was running on the 304 fine when I pulled the motor. Supposedly they ran the motor with the carb on it before shipping it in order to tune and time it.
Mike
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Unread 03-03-2008, 08:20 PM   #5
jayhawkclint
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Sounds like fuel to me. Either vacuum leak, carb leaned way out, floats bottomed, insufficient fuel psi/volume.
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Unread 03-03-2008, 08:29 PM   #6
atom73
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What are the common vacuum leak locations. I have never "looked for a leak" before. I do think its either fuel or I guess vacuum which results in poor fuel flow. This is all good banter guys, thanks a lot. I would never have been able to do what I have to this jeep if it wasnt for the help I have recieved here.
mike
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Unread 03-03-2008, 08:48 PM   #7
ky81cj7
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easy way to check vacum leak is have someone crank it then you put a rag over carb. If it idles with rag over carb it has a leak
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Unread 03-03-2008, 08:55 PM   #8
Trapshooter
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A vacuum gage would be very usefull right now for your situation. They are not that expensive and are a great troubleshooting tool.

ky81cj7's tip about useing a rag is a good one but be carefull not to have the sucker get pulled down into the carb.

The problem definitely sounds like a fuel delivery issue.

Good Luck.............
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Unread 03-04-2008, 08:09 PM   #9
atom73
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Went to autozone and pepboys today and asked for a vacuum gauge. I could have gotten a better response from Beavis and Butthead!!!. I will locate on online and purchase there. When I do get it, how do I use it. I do have a theory, I noticed early on when I was trying to start the motor that I got a little backfire and some vapor came out from between the carb and the manifold, could that be where my leak is coming from? If it is, what is the best way to seal that, its a brand new gasket there and I dont think I want to use any sealer.
Mike
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Unread 03-04-2008, 08:33 PM   #10
Chrisfol82
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Im sure autozone probably stocks them on a shelf somewhere. If you dont want to wait either try another autoparts store or just look around and you shoudl be able to find one.

the help at autoparts stores is pretty bad around here too. The Napa here is pretty good, but you really hve to walk the guys at autozone through their own computer system to find a part half the time. Usually i try to find the part number i need online then just get them to cross refrence it or something

But anyways thats somethign they shoudl carry they probably just dont know what it is. They probably dont sell many so they may have not stocked it or had to reorder in years.
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Unread 03-05-2008, 12:00 AM   #11
Trapshooter
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Wow, I had no idea they where so hard to find these days. I've had mine for years.

Here ya go, found this one at Sears, only $20 bucks.

http://www.sears.com/shc/s/p_10153_1...rd=vacuum+gage
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Unread 03-05-2008, 12:07 AM   #12
crusty75
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Mike,
"I noticed early on when I was trying to start the motor that I got a little backfire and some vapor came out from between the carb and the manifold, could that be where my leak is coming from? If it is, what is the best way to seal that, its a brand new gasket there and I dont think I want to use any sealer."

I would start there, retorque the carb. If that doesen't help, replace the gasket. Seems to me that if "vapor" can get out, air can get in.
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Unread 03-05-2008, 12:37 AM   #13
DannibusX
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Couldn't hurt to rebuild the carb. Especially if it's used. Since it came off of a 304, does anyone think it may need to be rejetted for the 360?
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Unread 03-05-2008, 05:53 PM   #14
atom73
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Problem solved

I got it started and running well. It was the gap between the carb and the intake. When I had taken the carb off for putting the motor in I guess I left the washers on the mounting studs and then didnt notice them when I replaced the carb. So I essentially had spacers on all four of the mounting studs. When I took those off and reinstalled/torqued the carb she started right up and hummed nicely. So, it was fuel starved as a result of a vacuum leak, you guys nailed it. Also, it was the gap between the carb and manifold, good job and thanks guys. Next step, I will be working on a power steering leak.
Mike
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Unread 03-05-2008, 06:25 PM   #15
Bard
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Nice, Gotta love video, best way to visualize issues and actually hear them. Good incentive for other to post with issues like that. I think you will be pretty happy with the motor, everything needs modification on a Jeep.

Look forward to your progress
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