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Unread 08-17-2014, 12:58 PM   #1
born2fish
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1988 YJ Wrangler 
 
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new motor problems

Ok , I have an 88 yj with an 83 drive train (dont ask, cant tell you why).
I just installed a new long block 258. Also did team rush upgrade and installed rebuilt motorcraft 2150 carb. The jeep was already nuttered.
The new motor fired right up and idled great. Set timing to 12 and spark plug gap at .45 Took for test drive and the motor died. Starts up idles fine, will run for a brief time then die. It is getting fuel, and is running a little rich. best I got was hitting third gear once before it backfired and died. I am stumped, and also now hear a little tick on my new motor!

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Unread 08-17-2014, 01:18 PM   #2
born2fish
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Unread 08-17-2014, 01:27 PM   #3
Mike Romain
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To start, your gas filter is in upside down. It needs to sit level with the return line up at the top so on a hot shutdown any vapours produced get blown off top of the filter back to the tank. Turned like yours also let's gas drain back to the tank when it sits.

Backfire and die implies spark to me. How tight is the power connection to the coil?

Is the ground strap from the rear of the head to the firewall intact?
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 08-17-2014, 01:31 PM   #4
Mike Romain
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What about your gas tank vent? Don't see any plumbing for that. If the vent (charcoal canister) isn't working or its lines are blocked or even if the air filter on the bottom is real dirty, it can put a vacuum on the gas tank making you run out of gas.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 08-17-2014, 02:30 PM   #5
born2fish
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Thanks for the reply<
here is filter now, is this correct? The coil and black half moon shaped connector are both new. The connection feels solid. I have not hooked up any vacuum lines to new carb yet (the ports are capped off). The charcoal canister vent is there and was hooked up to the carter. ( I also tried carter on new motor with same results). I do not have a firewall strap? only grounding strap I have is on drivers side motor mount
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Unread 08-17-2014, 09:37 PM   #6
RenoF250
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Sounds like you are running out of fuel to me.
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Unread 08-18-2014, 02:57 AM   #7
Unretarded
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Not that it has much to do with your issue, but is it a roller cam engine and did you break it in.......not up to speed on when those engines went roller cam.
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Unread 08-18-2014, 05:10 AM   #8
Mike Romain
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Quote:
Originally Posted by born2fish View Post
Thanks for the reply<
here is filter now, is this correct? The coil and black half moon shaped connector are both new. The connection feels solid. I have not hooked up any vacuum lines to new carb yet (the ports are capped off). The charcoal canister vent is there and was hooked up to the carter. ( I also tried carter on new motor with same results). I do not have a firewall strap? only grounding strap I have is on drivers side motor mount
The body tub has to be grounded with a cable or it has to steal power through components like the gas pedal linkage or brake pedal or clutch pedal or radio antenna or.... This can cause the ignition to lose spark.

The strap across the mount just grounds the frame. The body is on rubber mounts.

Stock there is a mesh cable from a rear head bolt to the firewall. A cable from the battery negative to the firewall would work.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 08-18-2014, 05:18 AM   #9
grasmo
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Quote:
Originally Posted by Unretarded View Post
Not that it has much to do with your issue, but is it a roller cam engine and did you break it in.......not up to speed on when those engines went roller cam.
just in case you were not aware, hard to tell from your post, there is no break-in on a roller motor.
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Unread 08-18-2014, 08:32 AM   #10
born2fish
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I will add a firewall ground. Does it need to be a certain size cable?

I am not sure if the motor is a roller motor..I ordered the same block casting that was in the jeep. It is a 1980 block. I followed the break in procedures sent from S&J Engines. They even sent break in oil for the first 500 miles...so far I have only logged 6 miles on it
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Unread 08-18-2014, 09:09 AM   #11
Mike Romain
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I would use battery cable size #4 at least. If you run big lights, then larger is better. The stock one is a mesh cable between the engine and firewall but is only designed for a stock power load. The mesh holds up to the movement best, but if you go from the battery over, no issues.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 08-18-2014, 09:19 AM   #12
CSP
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Not sure how the roller motor thing came up. A 258 has a flat tappet cam unless you spend the big bucks to convert it to roller.
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Unread 08-18-2014, 10:37 AM   #13
delirious1
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Quote:
Originally Posted by RenoF250 View Post
Sounds like you are running out of fuel to me.
Me too. Maybe carb float. Starves the engine at higher RPM. How's it running at idle and maybe 10-20 MPH?
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Unread 08-18-2014, 11:21 AM   #14
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Quote:
Originally Posted by grasmo View Post
just in case you were not aware, hard to tell from your post, there is no break-in on a roller motor.

Yes, thanks......

Quote:
Originally Posted by CSP View Post
Not sure how the roller motor thing came up. A 258 has a flat tappet cam unless you spend the big bucks to convert it to roller.

The OP, mentioned the new motor fired right up and idled great and a few lines later mentions now my new motor has a tick.......but no mention of break in.
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Unread 08-18-2014, 05:07 PM   #15
born2fish
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Will start and idle. I can hold throttle at say 1500 Rpms fir about 30 seconds, then it stumbles and quits.
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