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Ongoing Problem: Engine Stalls When Put in Gear |
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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Posted: Mar/01/2018 at 1:24pm |
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So, I have a '74 Javelin AMX. 360 with 998 trans. I posted about this a while back, but I figured I'd start a new thread since I feel like I have a better idea of what's going on now.
I've set the timing anywhere between 12-25 degrees advanced and this thing doesn't like anything. The best I've squeezed out of it is a 1000 RPM idle, but it still drops down to 550 RPM when put in gear. I'm hearing it shouldn't drop more than 200 RPM, not 450+. Not understanding why it's bogging down so much. Here's a breakdown of everything I've done and what I know up to this point: -The 360 is a brand new rebuild -Cam was installed with timing straight up -No vacuum leaks -Started with 750 Holley and switched to 600 with the same issue -Tried running with and without the carb spacer -Swapped out the stock converter for a 2500 RPM stall Hughes converter -Swapped out the springs in the distributor for heavier ones Not sure what's going on, but I'm running out of ideas and patience. Seems like everything I try doesn't make any difference. Help? |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Sounds like your cam is 180° off. Distributor too far advanced. Way too rich or too lean on carb.
Also you may have a bad plug wires or have crossed some. Look at the plugs after a good 2 minutes of idling at 1000 in park. Take pictures and post. Edited by 304-dude - Mar/01/2018 at 1:52pm |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Compression test.
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Gremlin Dreams
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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I might also add that I can get it to idle in park as low as 500 RPMs without stalling. When I turned up the idle speed so I could drive it, it ran strong.
I'm gonna do a vacuum test this Saturday when I get some time to work on it more. Edited by WhatISit - Mar/01/2018 at 2:00pm |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Check your vac advance diaphragm and line for leak. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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I do have a brand new one I'll probably throw on there |
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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My dad had the car when it still had the original 304 in it and said the car still shifted into gear a little hard back then. Said he lowered the idle speed but it kinda labored in gear. Think it could be something to do with the trans?
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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Is the lockup converter wired properly? If always on in 1st it will cause similar issues as you have stated. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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WhatISit
AMC Addicted Joined: Aug/07/2017 Location: Phoenix, AZ Status: Offline Points: 0 |
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It's non-lockup. |
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Midnight Rambler
AMC Addicted Joined: Jan/17/2011 Location: SoCT Status: Offline Points: 1670 |
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It may be a timing/idle/vacuum problem. Before you do anything read the first post on page 4 of this link, it's a primer on idle/rpm. http://theamcforum.com/forum/idle-speed-high_topic91420_page4.html |
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'66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
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