Running WAY too rich.
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=39515
Printed Date: October-07-2024 at 6:23am
Topic: Running WAY too rich.
Posted By: KooK
Subject: Running WAY too rich.
Date Posted: July-28-2016 at 11:34pm
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So I just did a leakdown on my 79 Mustang 17 (302 V4) and it came back that all of my cylinders are between 60-70% @ 100psi with 30-40% basically just getting past the rings. When I took my plugs out they were blacker than the night sky, so obviously I have an over-fueling issue. I was wondering if somebody could tell me if this is the correct carb for my boat, then we'll go from there. Holley 4bbl    
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Replies:
Posted By: KooK
Date Posted: July-29-2016 at 12:36am
| Thinking about it, I did have to idle in for quite some time the last time I came in... Probably a bad test of plugs unless I shut it off at WOT. Either way, kinda low leakdown. |
Posted By: Jonny Quest
Date Posted: July-29-2016 at 2:55am
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When was your carb last re-built? Call Vince at www.skidim.com and he can get you the proper carb re-build kit. In your top picture you captured the the carb numbers stamped on the air horn. Before replacing the carb, I would try this option. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: Duane in Indy
Date Posted: July-29-2016 at 7:54am
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Per the Holley manual: List 7159 is a model #4160 450cfm rebuild kit #703-33 Google "d4jl f" several sites show that carb for a 302 ------------- Keep it as original as YOU want it 1978 Mustang (modified) |
Posted By: KENO
Date Posted: July-29-2016 at 8:04am
Just to add a little to what Duane said 302's came with a 450 CFM Holley and my Holley manual agrees with his. Also if you rebuild it, do yourself a favor and get some new bowl screws for the front float bowl cause those style are just terrible for a lack of any better words. You'll see why when you take them out The secondary bowl screws look like they've been replaced (they appear to be a hex head) but the front look original The front are longer than the rear so make sure you get the right ones. And 450 CFM is plenty for a stock 302 |
Duane in Indy wrote: