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holley experts off idle surging part 2 |
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amc401t10 
AMC Addicted 
Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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 Topic: holley experts off idle surging part 2Posted: May/22/2016 at 3:33pm |
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After a 2 page thread on this before , I found an intake leak and all was in vain . intake seal now good so back to the carb , its a 4150 aed 750 about 20 years old.I bought it new. Problem was a rich surging @ 2500rpm and below when trying to cruise . after messing with jets and pv to no improvement I robbed an 800 do off my 455 pontiac and bolted it down, wow what an improvement, in idle and surgeing , I did nothing but idle and fuel screw adjustment.
I believe I have a bad metering block, can't c anything but fuel is getting by it somehow . the 800 is almost perfect in the problem area. A dirt track engine tunner friend said he has seen this a couple times before, changed the block after repeted jet and pv changes, to finally fix the problem. I ordered a set of qft billett metering blocks with. Adj ifrs and pvcrs. I've built over 100 holley and never seen anything like this before. What in the world can happen to a block to cause this? I'm tearing the old block apart if the new ones fix the carb. Any comments? Any suggestions? Any one seen bad met block before? I've wasted so much time trying to dial this carb in! It wasn't this way before I parked in basement 2-4 years! Ps I have torn carb completely down and sonic cleaned it, no visible problems! Blocks due in Thursday, report back after install. Pss the 800 doesn't run any better in mid or top than the 750 did! 750 might actually be better on mid and top. Thanks |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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Greyhounds_AMX
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Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: May/22/2016 at 4:05pm |
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I had on once that constantly dripped fuel. Changed the block and everything was fine then.
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1968 AMX 390 w/T5
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Greyhounds_AMX
AMC Addicted
Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: May/22/2016 at 5:27pm |
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It started just after time trials. My wife ran home and grabbed a spare carb for me and I runnered up in the street class still. It was a Mopar meet and the final 8 in the bracket had 3 of our AMCs.
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1968 AMX 390 w/T5
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Hurst390
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Joined: Apr/20/2008 Location: secret Status: Offline Points: 5818 |
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Posted: May/23/2016 at 7:48am |
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Take a straight edge and make sure the metering block surface on the main body is flat. Also make sure the vacuum port is not blocked in any way that supplies the power valve.
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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amc401t10
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Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/24/2016 at 3:12pm |
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Before I get started, anyone seen the new muscle car review? Its full of AMCs .
Now back to my carb , qft met blocks came in ,they look real nice, put my mains and pv in and mocked up , they are a little thicker than the stock ones, had to bend both pump arms a smidgen . rear bowl now hitting the pcv Casting around the nipple , had to file it down a bit . front bowl went on fine . I'm bolting it on now , cross ur fingers hope to start it up after while . Blocks came with a few extra jets , 1 set to richen the ifrs, and a set to Lean the pvcrs . Reviews iv read on other forums say they run good out of the box, hope so! Might have to put a wide band on my wish list next. |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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amc401t10
AMC Addicted
Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/24/2016 at 6:22pm |
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Starts and runs great, 4 corner idle now really sensitive, 1/4 turn at a time to get high idle, about 1 turn out. Before almost all way in to kill engine and up to 2 full turns out made little difference. Revs good starts up without touching gas after warm . hope to drive it tomorrow. Had a couple beers tonight . no leaks .
If all is well I'm tearing into the old block this Friday and c if I can c anything out of place ! |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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7TZ
AMC Nut
Joined: Aug/16/2010 Location: California Status: Offline Points: 264 |
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Posted: May/25/2016 at 4:35pm |
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I have my Muscle Car Review, very happy to see at least two full articles on AMC's. Less than happy to see its the "Von Piranha" on the cover though.
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1969 AMX
2005 350Z 1970 240Z |
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tsanchez
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Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Posted: May/25/2016 at 5:02pm |
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Probably an emulsion tube clogged, they come out of the top of metering block
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amc401t10
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Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/25/2016 at 6:22pm |
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So a emulsion tube cloged would cause a rich off idle condition?
And I can remove the brass plugs, clean everything up and put it back into service? Thanks |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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tsanchez
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Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Posted: May/25/2016 at 6:47pm |
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If it just has brass plugs then yes just remove them, and clean it and reinstall new ones as there are no tubes in the wells. If it has emulsion tubes then it will have a machined flat brass looking plug(its the tube) that you will have to figure out how to remove and clean without destroying it.
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