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390 Dilema

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Old Mar 25, 2001 | 11:42 AM
  #1  
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glenn 79
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From: Aurora Illinois
390 Dilema

 
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Old Mar 31, 2001 | 08:29 PM
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390 Dilema

I have a '78 4x4 with a 390,Np435,Np205 and my problem is that i recently had to put a new clutch in, and while I had the engine out I decided to put some new rod and main bearings in along with a new oil pump and gaskets, minus head gaskets.Anyway everything is back in it's place and now she will not start. She's back-fireing through the carb. I've gone through the basics, I put the timing marks at TDC and #1 piston is where it should be and so is the rotor. I've checked all my vaccum lines and they are where they should be. I've traced all my plug wires and they are in the right place, I'm really stumped here. This truck ran beautifully the day I took the engine out. Any advice will be greatfully appreciated.
 
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Old Mar 31, 2001 | 09:50 PM
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From: LAT 46.55501° & LON -122
390 Dilema

Are your valves opening when they should, maybe you did not get the timing chain on properly. Being off just one link can do that.
 
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Old Mar 31, 2001 | 10:33 PM
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390 Dilema

It may sound silly but maybe your 180 degrees out on the distributor good luck
 
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Old Mar 31, 2001 | 10:37 PM
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390 Dilema

I would have to agree with the above. Backfiring trough the carb is a good sign of bad timing.
 
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Old Mar 31, 2001 | 10:46 PM
  #6  
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390 Dilema

Id have to say check the timing marks and check your distributor
Anthony DiPietro
79 F150 Ranger
 
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Old Apr 1, 2001 | 08:38 AM
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From: Summit, NJ
390 Dilema

I had the same problem with my 360 after I did my heads. It turned out my distributor was 180 degrees out. Let us know how you make out.

James Kern
1970 F250 4x4
 
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