engine hiccup, does not die, but it sputters |
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engine hiccup, does not die, but it sputters |
malcolm2 |
Oct 7 2017, 07:55 AM
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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 L-jet 1911cc engine. Last problem was solved in May I believe. I have been putting miles on it pretty regularly since then.
Some folks may remember that I had an internal backfire and bent my AFM. The backfire came from a massive vacuum leak at the TB seal. I had just had the TB rebuilt, but did not replace the seal and did not install it in the same orientation as it was before. So there were depressions on the seal. Anyway. My smoke machine found the leak, plus a few more. Sealed them up and installed a new AFM tuned to the 1911 and all was well. Fast forward to this week. Wednesday driving home from work, just entering the interstate and I got a big hiccup. Felt like the engine died for a brief second as I was shifting. Kinda like the jerk you feel when you are jump starting the car by popping the clutch. made it home and did not drive again 'til this morning. It happened again. Then again, then really bad spitting and sputtering on acceleration. It idles fine tho. So I turned around and went home. Smooth ride home to get another car, thank goodness. I have an on board Air/Fuel meter that I have been monitoring. All this happens so quickly, I just don't have time to see the meter. 1/2 a tank of gas, just e10 87 oct, but it could be bad. But the 1st 1/2 was fine. I figure if I can this weekend, I'll breakout the smoke machine and see it I have another vacuum leak. Any other thoughts. |
dr914@autoatlanta.com |
Oct 8 2018, 12:20 PM
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#2
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914 Guru Group: Members Posts: 7,896 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
I would say that the dual fuel pump relay lost connection for a moment. Common 1.8 problem
75 L-jet 1911cc engine. Last problem was solved in May I believe. I have been putting miles on it pretty regularly since then. Some folks may remember that I had an internal backfire and bent my AFM. The backfire came from a massive vacuum leak at the TB seal. I had just had the TB rebuilt, but did not replace the seal and did not install it in the same orientation as it was before. So there were depressions on the seal. Anyway. My smoke machine found the leak, plus a few more. Sealed them up and installed a new AFM tuned to the 1911 and all was well. Fast forward to this week. Wednesday driving home from work, just entering the interstate and I got a big hiccup. Felt like the engine died for a brief second as I was shifting. Kinda like the jerk you feel when you are jump starting the car by popping the clutch. made it home and did not drive again 'til this morning. It happened again. Then again, then really bad spitting and sputtering on acceleration. It idles fine tho. So I turned around and went home. Smooth ride home to get another car, thank goodness. I have an on board Air/Fuel meter that I have been monitoring. All this happens so quickly, I just don't have time to see the meter. 1/2 a tank of gas, just e10 87 oct, but it could be bad. But the 1st 1/2 was fine. I figure if I can this weekend, I'll breakout the smoke machine and see it I have another vacuum leak. Any other thoughts. |
malcolm2 |
Oct 8 2018, 02:32 PM
Post
#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 |
I would say that the dual fuel pump relay lost connection for a moment. Common 1.8 problem This problem has been fixed for a full year now. Doc, did you see the timing light video? Post #6. Would the fuel pump cause the ignition to cut out on each plug wire? I replaced the hot spark module. I bought a spare at the same time. Then got word that it is problematic. So if this happens again, I have a spare. Then I will either go back to carrying a spare points and condenser, or maybe bite the bullet and get one of those high dollar distributors or a petronix module. Either way I believe the problem was the hot spark. when it works it works great. But it does not like the higher voltage and the heat. Thanks |
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