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 |
pilothyer |
Mar 28 2016, 06:42 PM
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#2
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Member Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States |
Ideally you should have low pressure at high vacuum (idle) and higher pressure at low vacuum (acceleration) Do you have another pressure regulator you can swap with to check values at low and high vacuum conditions ? In summary what you are looking at is low pressure at high vacuum (idle 28 psi) high pressure at max throttle (32 psi) and somewhere around 30 psi at cruising.
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malcolm2 |
Mar 29 2016, 09:46 AM
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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 |
Ideally you should have low pressure at high vacuum (idle) and higher pressure at low vacuum (acceleration) Do you have another pressure regulator you can swap with to check values at low and high vacuum conditions ? In summary what you are looking at is low pressure at high vacuum (idle 28 psi) high pressure at max throttle (32 psi) and somewhere around 30 psi at cruising. I do not have one. I'll check the web. Maybe I can find something not too expensive. I bet they are not available new, are they? Is my vacuum backwards? I had 10" at idle and 20" at 3000 rpm which seems right to me... the air is being sucked into the engine faster when it is high RPM. |
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