My FI Frustrations Continue, Still have engine cutting out |
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My FI Frustrations Continue, Still have engine cutting out |
dralf |
Jun 15 2019, 01:26 PM
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#1
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Member Group: Members Posts: 230 Joined: 24-January 04 From: Dayton, Oh Member No.: 1,597 |
I keep purchasing components for my 1975 D Jet system but to no avail in solving the mystery of why it will sometimes cut out when the reves are about 2500 and the engine is under load. For those who have read my earlier posts, I now have new wiring harness, coil, points, condenser, cleaned the dizzy, new Auxiliary Air Valve, and cleaned all wire connections. Also replaced the fuel filter. My recent purchase was a new MPS for mine had a diaphragm leak. I drove around the block and was happy for the first lap since my adjusting the valves and timing seemed to improve acceleration. Unfortunately by my second lap the engine started to randomly cut out as it have before. My path forward is to replace the vacuum advance diaphragm on the dizzy which I found a leak. also to check the cylinder head temperature sensor, and the throttle position sensor. I there anything else I should be checking or replacing ? I am thinking about setting up my timing light inside the cabin so I can verify that during those times where the engine cuts out the spark plugs are still getting power. I hate to think my ECU is bad. Also where or who can check that out if it comes to that ?
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dralf |
Jun 18 2019, 07:51 PM
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#2
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Member Group: Members Posts: 230 Joined: 24-January 04 From: Dayton, Oh Member No.: 1,597 |
I have a new bit of data for my intermittent runnability problem. Today I attached my timing light to one of the plug leads and put the light on the passenger seat. I then drove around the block numerous times until the engine cut out the sputtered and then the engine kicked on with a bit of a jerk. I was watching the timing light during a few of these incidents. Each time the timing light was flashing which told me that the engine was getting sparks thus the coil, points and distributor wiring is OK. This points me to a fuel issue. I have checked and replaced the fuel filter and cleaned and tightened the pump wiring. The pump looked old but seemed to run OK with 12 volts... I do not know how well it maintains a pressure or has an occasional hiccup. My next test is to attach a volt meter in line with the pump. I will drive around the block and if it cuts out yet is still getting 12 volts I will replace it with a new one.
I have read about using a pressure gauge to test the pump, but do not know how to do that or what gauge to buy. I also know nothing about the fuel pressure regulator in my 75 2.0 D Jet system. Is there something here I should check into ? |
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