Intermittent Problem with Betty's car, I am at my wit's end on this one. |
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Intermittent Problem with Betty's car, I am at my wit's end on this one. |
ClayPerrine |
Dec 22 2014, 07:17 PM
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#1
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
About 2 weeks ago, Betty came home and said her 74, 1.8L Ljet 914 was intermittently cutting out. I took it out to test drive it, and sure enough, it will randomly cut out. Sometimes mildly, sometimes it feels like the engine shuts off completely, then turns back on.
So I started troubleshooting. Nope, grounds for the injectors are fine. Put the LM-1 in the tailpipe and had her drive it. Every time it cuts out, the LM-1 shows it going lean. I put an L-Jet tester I have on it and ran through all the tests and it shows as working fine. I had it running in the garage, and I went through a "wiggle test", wiggling every wire and connection on the engine. Nothing I do can replicate the issue in the garage. So I started throwing parts at it. To date I have replaced: The air flow meter. The fuel injection wiring harness. The double relay. The dropping resistors. The fuel pump. The ECU. The CHT. The whole distributor with a different pertronix, and tried points too. Nothing I have done to date helps. So I am hoping the collective knowledge of this place will help. I have checked all the simple stuff already. This is going to be hard to fix, whatever it is. I am now to the (IMG:style_emoticons/default/WTF.gif) stage, and looking for suggestions. |
ClayPerrine |
Dec 23 2014, 05:57 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
My first thought would also be a electrical issue somewhere. But you say you have no fuel sock, Have you ever had the tank lined? I had an issue years ago where the liner came off in a sheet and would lay down right over the fuel outlet. Figured it would move off then get sucked back down after a few miles. I had the tank out replacing the fuel pump. While I was doing that, the gas gauge quit working. I pulled the sender to both check in the tank for debris and to diagnose the gas gauge. The gauge was a broken wire, and the tank was clean inside. Tps L-Jet has a 3 position throttle switch. It has one set of contacts open at idle, and another set a WOT. It won't be a problem at cruise, and this can happen at steady state driving on a smooth road. With my wife, that will NEVER happen. Her car, her rules. She even got mad at me one time for putting a sticker on her car without her permission. Thanks to everyone for their ideas. I am going to change both the ignition switch and the injectors next. |
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