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Author Topic: Help!! B6t stumbles  (Read 3791 times)

Fitsbain

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Help!! B6t stumbles
« on: July 09, 2016, 06:44:54 PM »
My B6T (still in the capri till I solve this, then on to the festy) has a throttle related stumble. If you ease into it from any RPM, it will accelerate (in neutral in the driveway as it has absolutely no brakes). However if you are more aggressive with the throttle, it will stumble (miss-fire?). From a higher RPM it will stumble and then recover and rev. Once it is revving (RPM increasing rapidly) all seams fine. Does brake up a little when you take your foot out of it and the butterfly closes.

Its got new plugs, wires, cap and rotar, air intake, new vacuum lines (most places, remaining look good), timing set to 12 (down from 22 ish before I touched it). Idle is at 850.

SO?

What do I do now?

And Thanks
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WashiestSnake

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Re: Help!! B6t stumbles
« Reply #1 on: July 09, 2016, 11:02:07 PM »
Are you sure the sparkplugs are gapped correctly? Have you done anything with the distrubitor?
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

Fitsbain

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Re: Help!! B6t stumbles
« Reply #2 on: July 10, 2016, 12:03:57 AM »
Gapped at .04
 
Verified the mechanical advance after I set the timing to 12 degrees.
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NomakeWan

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Re: Help!! B6t stumbles
« Reply #3 on: July 10, 2016, 01:51:43 AM »
I wonder if your coil is going bad.
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WashiestSnake

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Re: Help!! B6t stumbles
« Reply #4 on: July 10, 2016, 02:00:21 AM »
I agree with NomakeWan coil could be it, thats the only thing you havent replaced. Hows the return spring on the throttle is it acctuating correctly?
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

Fitsbain

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Re: Help!! B6t stumbles
« Reply #5 on: July 10, 2016, 05:24:38 PM »
pulled the bumper and the intercooler.

Can blow through it just fine

coil coming tomorrow.
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WashiestSnake

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Re: Help!! B6t stumbles
« Reply #6 on: July 10, 2016, 06:32:20 PM »
Make sure all the intake piping/vacuum lines are secured/fastened corectly. I remember back a few months ago I heard something similar and it turned out to be the distributor, and a vacuum line.
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

Rocketman

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Re: Help!! B6t stumbles
« Reply #7 on: July 11, 2016, 01:41:56 AM »
The Capri is crazy sensitive to boost/vacuum leaks. Triple check all the piping.

Have you replaced the fuel filter?
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Fitsbain

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Re: Help!! B6t stumbles
« Reply #8 on: July 11, 2016, 09:26:55 AM »
Want to come across the state and help?

I'll provide drinks and food.

 :D

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chrispoe

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    • 91 BP Capri GT
Re: Help!! B6t stumbles
« Reply #9 on: July 11, 2016, 06:09:15 PM »
I think Rocketman is on the right track, it definitely sounds like an air/fuel ratio issue and the engine is running a little lean.
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Fitsbain

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Re: Help!! B6t stumbles
« Reply #10 on: July 13, 2016, 06:00:34 AM »
did a coil

set TPS to 660 ohms at closed throttle

The cold air bypass is working Idles at 1300 or so till warm then 850

No wideband but my nose says rich

tried the TPS as low as 460, and as high as 800. Seems no change Settled at 660.

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Fitsbain

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Re: Help!! B6t stumbles
« Reply #11 on: July 20, 2016, 08:52:45 AM »
replaced the fuel filter

Still no improvment.
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Rocketman

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Re: Help!! B6t stumbles
« Reply #12 on: July 21, 2016, 11:10:17 PM »
Have you tried pulling any codes to see if there are any stored?
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Fitsbain

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Re: Help!! B6t stumbles
« Reply #13 on: July 22, 2016, 07:37:43 AM »
no

I know I caused one when I forgot to reconnect the TPS

but it went away once I re-attached it.
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