low speed judder (2.8)

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capri28
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low speed judder (2.8)

Post by capri28 » Wed May 29, 2019 8:34 am

Hi,
I'm hoping you guys can help me out with an ongoing issue.

I recently serviced the car replacing plugs, leads, cap & rotor (rev limiter one) & since then she hasn't been happy, she struggles to start sometimes cuts out but does eventually restart but runs lumpy for around 2 minutes, then settles but at low speeds (20-40mph) she judders, it sort of feels like she's holding back, I've also heard form the exhaust a slight back fire but not all of the time so not sure if this is related.

I've checked all the parts that I've fitted, I've even put all of the old parts back on but the issues are still present.

Any help would be most grateful

Thanks

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Peter-S
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Re: low speed judder (2.8)

Post by Peter-S » Wed May 29, 2019 4:50 pm

Have you checked the plug colour after you've been for a bit of a run? sounds like it could be running a bit lean.
Did you adjust anything when you serviced the car?
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capri28
Posts: 122
Joined: Sat Sep 19, 2009 11:51 am
Car(s): Rosso Red Ford Capri 2.8i Special 1986 D reg (Daily driver)
Stratos Silver Ford Capri 2.8i Special 1986 D reg (Summer driver)

Re: low speed judder (2.8)

Post by capri28 » Wed May 29, 2019 6:51 pm

I didn’t adjust or needed to adjust anything,
Just replaced all of the parts I mentioned

I will check the condition of the plugs at the weekend
Thanks

v6lad
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Re: low speed judder (2.8)

Post by v6lad » Wed May 29, 2019 8:07 pm

Have you checked the firing order maybe a couple of leads are round the wrong way.
1987 2.8 Turbo technics. :drive:

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Stroker
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Re: low speed judder (2.8)

Post by Stroker » Wed May 29, 2019 8:29 pm

Have you checked the ignition timing?

capri28
Posts: 122
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Car(s): Rosso Red Ford Capri 2.8i Special 1986 D reg (Daily driver)
Stratos Silver Ford Capri 2.8i Special 1986 D reg (Summer driver)

Re: low speed judder (2.8)

Post by capri28 » Wed May 29, 2019 9:57 pm

Stroker wrote:
Wed May 29, 2019 8:29 pm
Have you checked the ignition timing?
Yes the timing has been checked & is spot on...

All leads are on in the correct order, I made sure I changed them one at a time!

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Stroker
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Re: low speed judder (2.8)

Post by Stroker » Thu May 30, 2019 6:03 am

Have you checked for vacuum leaks?

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pbar
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Re: low speed judder (2.8)

Post by pbar » Thu May 30, 2019 8:43 am

My laser has exhibited these symptoms when the mixture in the carb is too lean, I know you don't have a carb but nevertheless this would tally with what Peter has said about the car running lean.

Strange how it's happened after changing service parts though, 'messing' with one aspect can highlight a dormant issue elsewhere though, or just coincidental perhaps.

martin l
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Re: low speed judder (2.8)

Post by martin l » Thu May 30, 2019 8:42 pm

Hi i had a problem just like yourself. Have you checked the regulator its located behind the dash board. plus the capri club run quite a few areas to cover on 2.8 fuel injection promblems well worth a look. Hope this helps.

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nigecapri
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Re: low speed judder (2.8)

Post by nigecapri » Fri May 31, 2019 10:36 am

Check the carbon brush in the centre of the dizzy cap, it might have a broken spring or be stuck too far in. Is there a spring tab contact in the centre of the rotor arm that is flattened? Is the king-lead pushed fully home both ends - also each HT lead?
When warmed up they will run on a smaller spark but from cold or under load they need a good spark for a regular clean burn.

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