|
|
|
Your donations help keep this valuable resource free and growing. Thank you.
|
Rough Idle |
Post Reply 
|
Page <123> |
| Author | |
DOUG SLOCUM 
AMC Fan 
Joined: Oct/04/2019 Location: OREGON Status: Offline Points: 21 |
 Post Options
 Thanks(0)
 Quote Reply
 Posted: Jul/21/2021 at 10:28am |
|
BDCVG I will check for any right side smoking.
|
|
 |
|
|
mbwicz
Supporter of TheAMCForum 
Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1989 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 11:04am |
|
With your performer intake, I would assume that the plenum is fully divided so that one side of the plenum feeds half of the engine. I would also assume that cylinder 6 runs off of the other side of the carb than cylinder 8. If these assumptions are true (and I may be wrong, but that's what it looks like on the edelbrock website), then i doubt the carb is the issue. One primary barrel would feed cylinder 6 and the other one would feed cylinder 8. So you would need to adjust both sides of the carb when tuning the idle.
Did you confirm that all the intake bolts are tight? Mike |
|
|
1970 AMX, one step forward, one step back. Both steps cost time and money.
|
|
|
|
|
6768rogues
AMC Addicted 
Joined: Jul/03/2007 Location: United States Status: Offline Points: 6237 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 4:56pm |
|
That happened to me with an Eddy carb. I noted the adjustment of the mixture screws then removed them. I took a blow gun and blew compressed air into the holes where the screws were. Then I put the screws back in adjusted to where they were before. Problem solved. My brother told me. I thought it was stupid. I tried it and it worked. It wasn’t so stupid.
Edited by 6768rogues - Jul/21/2021 at 4:58pm |
|
|
Content intended for mature audiences. If you experience nausea or diarrhea, stop reading and seek medical attention.
Located usually near Rochester, NY and sometimes central FL. |
|
|
|
|
DOUG SLOCUM
AMC Fan
Joined: Oct/04/2019 Location: OREGON Status: Offline Points: 21 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 5:32pm |
|
mbwicz I agree with your info about which runner is feeding the cylinders in question, but with the idle my first thought was carbueration. All intake bolts are tight.
|
|
|
|
|
DOUG SLOCUM
AMC Fan
Joined: Oct/04/2019 Location: OREGON Status: Offline Points: 21 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 5:36pm |
|
6768rogues I did that very thing 15 minutes ago. I used carb cleaner not compressed air. I could see the spray coming up through the carb intake. Idle is a little better but still rough. I may have two separate issues going on, the idle, and the 2 carboned plugs. It's a head scratcher.
|
|
|
|
|
amcenthusiast
AMC Addicted
Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 8:08pm |
|
Don't waste any more of your expensive time guessing; buy a Chiltons Repair Manual for about $15 and follow the steps in the troubleshooting section.
(compare your time spent already to solving your problem to cost of very well written AMC repair manual?) My first thought was rotten head gasket between 6 & 8. That's the 'dead give away clue' Compression test and compare all 8 cylinders. In time, even the expensive hardback Chiltons for 68-71 AMX & Javelin will easily pay for itself.
|
|
|
443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
|
|
|
|
73hornut
AMC Addicted
Joined: Jul/03/2007 Location: Southern Oregon Status: Offline Points: 3130 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/21/2021 at 9:12pm |
|
Bad plug wires?
|
|
|
71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
|
|
|
|
DOUG SLOCUM
AMC Fan
Joined: Oct/04/2019 Location: OREGON Status: Offline Points: 21 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/22/2021 at 10:05am |
|
amcenthusiast Thank you for that tip. I also thought possible blown head gasket between #6 and #8. Compression test showed equal pressure across both heads. |
|
|
|
|
DOUG SLOCUM
AMC Fan
Joined: Oct/04/2019 Location: OREGON Status: Offline Points: 21 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/22/2021 at 10:07am |
|
73hornut New plugs, wires, cap and rotor as well as new fuel pump. Test shows equal spark across all cylinders.
|
|
|
|
|
mbwicz
Supporter of TheAMCForum
Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 1989 |
Post Options
Thanks(0)
Quote Reply
Posted: Jul/22/2021 at 10:49am |
|
Silly question: Any chance that the plug wires for 6 and 8 got reversed? Based on your original post I wouldn't think so, but I have to ask.....
Mike
|
|
|
1970 AMX, one step forward, one step back. Both steps cost time and money.
|
|
|
|
|
Post Reply
|
Page <123> |
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Click for TheAMCForum Rules
Topic Options