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Author Topic: Engine stumbles around 4500 rpm - new distributor cap, rotor, wires  (Read 515 times)

94daves

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    • 1994 Mercury Capri N/A

I just replaced the distributor, cap and rotor (along with all the belts, water pump, alternator, spark plug wires) and the engine stumbles around 4500 rpm.  It stumbles at 4500 going into first, second, etc.  Could this be something due to the timing or new distributor?  Or something else?  It did not do this before I put in all the new parts.  Thanks.
« Last Edit: June 02, 2019, 09:53:09 AM by 94daves »
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Rocketman

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #1 on: November 19, 2018, 05:53:18 PM »

I would double check everything, make sure none of the plug wires are loose. Have you verified engine timing? Does the car feel like it has normal power up to the point where it stumbles?
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


94daves

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #2 on: November 23, 2018, 10:10:32 PM »

The plug wires are tight.  The car feels like it has normal power up to 4500 rpm.  I just drove it again today and it was doing the same thing.  It's very repeatable.  I have not verified the engine timing.
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Pappy T

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #3 on: December 17, 2018, 03:55:49 PM »

Get it fixed ??
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94daves

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #4 on: December 22, 2018, 11:51:44 PM »

No, and Iíve stored it for the winter so itíll sit until March or April. 

Does anyone have any ideas?  Could it be fuel related?  It just seems such a coincidence that it started stumbling after I had some work done to it.  Could one of the mechanics knocked something off or loose by accident?
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chukT

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #5 on: December 23, 2018, 12:46:12 PM »

With what you had done, I would also suspect the base timing first. Verify that it is set properly as your next step.
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94daves

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Re: Engine stumbles around 4500 rpm - new distributor, cap and rotor
« Reply #6 on: June 02, 2019, 09:52:29 AM »

I'm back at it again to fix this problem.  Timing has been checked and verified by the shop that did the work in 2018 before I put it away for the winter.  There are no codes, no check engine light.  Does anyone have any ideas what could be causing this misfire/stumble at 4500 rpm?
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Rocketman

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Re: Engine stumbles around 4500 rpm - new distributor cap, rotor, wires
« Reply #7 on: June 02, 2019, 07:32:46 PM »

I wonder if your new distributor is faulty. Is it new/used/rebuilt? Do you still have the old one? What was the reason for replacing?

I saw a Capri distributor with bad internal bearings cause a miss in the past. The shaft was bouncing around and would not give a reliable signal to the pickup coil at higher RPM
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


94daves

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Re: Engine stumbles around 4500 rpm - new distributor cap, rotor, wires
« Reply #8 on: June 06, 2019, 04:12:46 PM »

Actually I only replaced the cap and rotor, not the distributor itself. 
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