Engine, Fuel or FI problems, spitting and sputtering again |
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Engine, Fuel or FI problems, spitting and sputtering again |
malcolm2 |
Mar 16 2016, 03:39 PM
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#1
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
75 1911cc with L-jet.
back in January I made this post: http://www.914world.com/bbs2/index.php?s=&...t&p=2286395 I have been driving quite a bit since then, even took a 6 hour round trip day ride to Knoxville. My guess it 4 or 5 tanks or about 1800 miles and no issues. Same thing happened today... Driving home from work on the interstate, MPH at 80, revs about 3400. Again, going up a long low hill, not far from my exit. I could feel some spitting and sputtering. The VDO CHT ring under #3 started heading down. Dropped to 200*F. When I exited and took my foot off the gas, it died. Started right up and I made it home braking with my big toe and gassing with my little toe. This time, I have a 1/2 a tank of e10 gas (not positive on that). So it is not running empty as hoped last time. Fuel pressure was at 40 on the engine bay gauge. Other suggestions last time were the filter. I am going to remove that today. With the #3 temp as it is, I might should start there. I will try my induct timing gun on it to see about spark. Need a noid light for the injector. and i'll take a look at the plug. I'll remove the disty and take a look. But #3 seems to not be firing and generating heat. I'll update, but any other ideas? Thanks, Clark |
timothy_nd28 |
Apr 18 2016, 10:00 PM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
You adjusted the AFM too rich. You really need a AFR gauge to readjust the AFM. On my 1911 build, I relaxed the AFMs clock spring 3 gear teeth. I remember you told me before that you went more than that on your AFM. Replace the plugs, keep the stock gap for now, and drive it for a few days with the AFR gauge attached, document the ratios you see and what speeds you see that at.
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malcolm2 |
Apr 19 2016, 02:55 PM
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#3
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
You adjusted the AFM too rich. You really need a AFR gauge to readjust the AFM. On my 1911 build, I relaxed the AFMs clock spring 3 gear teeth. I remember you told me before that you went more than that on your AFM. Replace the plugs, keep the stock gap for now, and drive it for a few days with the AFR gauge attached, document the ratios you see and what speeds you see that at. I was wondering about that today. Glad you chimed in. I don't have an AFR , I used a work buddies last time. He lives 45 minutes away, and does not work here anymore.... I need to see if he will UPS it to me... (IMG:style_emoticons/default/confused24.gif) I still have the black duct tape holding the plastic cover down and I did use a paint pen to mark the original spring setting. I looked up my Air : Fuel readings from 2 years ago.... I do believe that was after we moved the AFM spring. 1000 rpm idle = 17-ish:1 3000 rpm parked = 14.2:1 4500 rpm parked = 13-ish:1 4500 rpm driving up a hill = 12:1 I remember the forum saying I was a little rich at the time... shooting for 13.7 - 14.2 on the hill climb, right? |
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