93 D150 runs rough
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Joined: Aug 2018
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93 D150 runs rough
I have a 93 d150 with a remaned 318. First start of the day, it will fire right up and idle fine. I'm able to drive it for not even a mile and it dies on me. Then it won't fire back up unless I hold my foot to the floor. Even then it doesn't stay running. The truck has a new fuel pump and i did a fuel pressure test. When turning over it has about 39 lbs then it slowly looses pressure. It also has a new distributor. I pulled the plugs to see if i am getting spark and i am. I noticed that the plugs are jet black. The throttle body was also just cleaned. Does anyone have any idea what this could be?
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
i don't think the sensor would make it run that bad. the gauge is hooked to a difference sensor than the one Hey You mentioned. the gauge sensor is a single wire sensor and the computer one is a 2 wire sensor.
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Registered User
Joined: Aug 2018
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How do i tell if the fuel is in sync after the distributer was changed? I paid someone to change the distributer so I imagine it was set right. But it wouldn't hurt to double check at this point
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
i have never done it since but the best way is with the proper scanner. i have heard using the multi meter route can be hit and miss. have you replaced thee O2 sensor recently or checked for codes. these computers are pretty dumb and never complain about anythying
SYMPTOM/CONDITION:
Vehicles may exhibit surging, light bucking, or intermittent engine misfiring. This will most likely occur when the vehicle is at operating temperature, and under a light load at approximately 2000 RPM. This condition may be caused by a mis-indexed distributor. The following procedure is an alternative to the indexing procedure outlined in the service manual.
REPAIR PROCEDURE:
This procedure outlines an alternative distributor indexing procedure.
Connect a voltmeter to the distributor sensor connector by removing the end seal and carefully back probing the connector. Connect the positive lead to the sensor output pin (pin 3, either a tan wire with a yellow tracer or a gray wire, depending on vehicle application). Connect the negative lead to the sensor ground pin (pin 2, a black wire with a light blue tracer).
Rotate the engine clockwise as viewed from the front, until the number one piston is at Top Dead Center (TDC) of the compression stroke. The timing mark on the vibration damper should line up with the zero degree
(TDC) mark on the timing chain case cover.
Continue to rotate the engine slowly clockwise until the V6 or V8 mark (depending on engine type) lines up with the zero degree (TDC) mark on the timing chain case cover. The V8 mark is 17.5�after TDC and the V6 mark is 147�after TDC. NOTE: DO NOT ROTATE THE ENGINE COUNTER CLOCKWISE. IF THE ENGINE IS ROTATED BEYOND THE MARK, RETURN TO STEP 2 AND REPEAT THE PROCEDURE.
Loosen the distributor clamp bolt.
With the ignition switch in the ON position, rotate the distributor slightly in either direction until the voltmeter switches between the sensor transition point of 0 and 5 volts.
Adjust the distributor as close as possible to either side of this transition point and tighten the distributor clamp bolt to 19-26 N-m (170-230 in.lbs.)
Vehicles may exhibit surging, light bucking, or intermittent engine misfiring. This will most likely occur when the vehicle is at operating temperature, and under a light load at approximately 2000 RPM. This condition may be caused by a mis-indexed distributor. The following procedure is an alternative to the indexing procedure outlined in the service manual.
REPAIR PROCEDURE:
This procedure outlines an alternative distributor indexing procedure.
Connect a voltmeter to the distributor sensor connector by removing the end seal and carefully back probing the connector. Connect the positive lead to the sensor output pin (pin 3, either a tan wire with a yellow tracer or a gray wire, depending on vehicle application). Connect the negative lead to the sensor ground pin (pin 2, a black wire with a light blue tracer).
Rotate the engine clockwise as viewed from the front, until the number one piston is at Top Dead Center (TDC) of the compression stroke. The timing mark on the vibration damper should line up with the zero degree
(TDC) mark on the timing chain case cover.
Continue to rotate the engine slowly clockwise until the V6 or V8 mark (depending on engine type) lines up with the zero degree (TDC) mark on the timing chain case cover. The V8 mark is 17.5�after TDC and the V6 mark is 147�after TDC. NOTE: DO NOT ROTATE THE ENGINE COUNTER CLOCKWISE. IF THE ENGINE IS ROTATED BEYOND THE MARK, RETURN TO STEP 2 AND REPEAT THE PROCEDURE.
Loosen the distributor clamp bolt.
With the ignition switch in the ON position, rotate the distributor slightly in either direction until the voltmeter switches between the sensor transition point of 0 and 5 volts.
Adjust the distributor as close as possible to either side of this transition point and tighten the distributor clamp bolt to 19-26 N-m (170-230 in.lbs.)