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Stuttering under accelleration; Irritating
Topic Started: Wed Jul 22, 2009 8:40 pm (881 Views)
Rich27
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Hi all, I know its weird for me to as a tech question but I have a head scratcher.

If I am driving along and I put my foot down when the rev`s reach about 4000 Rpm my car stutters like crazy.
If I back off the throttle (a lot) I can still get the revs up but not as fast as I would like . Its as if somthing is blocking the fuel supply or somthing?

I have changed the fuel filter under 5000 miles ago. And run injector cleaner, all the way to RETRO (it did it on the way up)

Any ideas?
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feoffle
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Part of things
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My daily beater did something similar.

gave the terminals on the dizzy cap and the rotor arm a going with some emery cloth and all was well.

I'm wondering though if you don't have adequate fuel pressure. Can you rev it up when it's not under load, i.e. in neutral?
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chrismatheou
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Hmm..Coil maybe?
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Will
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Injector cleaner isn't really a good idea for the KE system IMHO.

The crap that it clears will almost certainly end up in your fuel distributor (metering head) causing more problems than it helps.

You really need to identify if you have a fuelling or igition problem though.

Will
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belait33
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Hi,

I had a similar problem on 2.0 Auto. It would struggle to pull away at the lights and when I put my foot down up to 3000 rpm, it stutters. When I back off the throttle and ease on the throttle, it takes forever to get any speed.

It turned out to be a worn dizzy cap and 1 dodgy HT lead going to the spark plug. New dizzy cap, rotor arm and HT leads solved the problem.

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RobertE
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Serial victim...
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It's q. possible that the distributor cap is scorched or cracked and it 'arcs' at higher revs, causing a misfire. Injector cleaner is mainly paraffin/kerosene and if you have a fresh fuel filter there won't be much getting as far as the fuel meter.

The wise old man (he must be long gone) at M-B Great West Road who used to advise me always made sure that I removed the insulating cover from Distributor caps (leaving them orange) so that condensation didn't build up and cause a crack.

Coil could be dodgy, but - how does it start? On the button?
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Rich27
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The thing is that it had new HT leads and a dizzy cap (Shitty BERU parts ) not so long ago :(

I`ll take them off and investigate further.
Edited by Rich27, Wed Jul 22, 2009 9:13 pm.
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Will
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Rich,

You could do with one of those ignition testers that will show the problem of a weak spark.

Have you checked and gapped the plugs? They should tell you a reasonable amount.

Will
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Rich27
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I also changed the plugs.

What should the gaps be?
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RobertE
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0.8mm, I think.
Edited by RobertE, Wed Jul 22, 2009 9:20 pm.
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Will
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Yes, I think Robert is right - 0.8mm seems to ring a bell (it should be under the slam panel?)

But you can whip the plugs out to see what's going on, should be quite indicative.

Will
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feoffle
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feoffle
Wed Jul 22, 2009 8:50 pm
Can you rev it up when it's not under load, i.e. in neutral?
?
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bri957
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What plugs did you use Rich?

The Bosch ones GSF supply for our cars now have a resistor, and caused me problems.

Switched to the Beru plugs, and all solved.
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Martrider
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I had a similar thing about 7 years ago with my 2.0ltr carb, but it turned out to be a sticking valve. It only happened somtimes but enough after driving it for a week for the valve stem to grind the apex of the cam shaft down rendering it useless.

It ended up bending the valve, so it wouldn't close fully, but for some reason only causing issues at about 4000rpm.

I still have the valve as a trophy. ;)

I would not dismiss this as driving it much further, could cause more damage. The strange thing was that it was still intermittant stuttering especially round roundabouts, until i took it off the road. At the time i think the new cam cost about £300 from Merc, and the work was another £300-400. Dunno if that's what it should have cost but that's what i paid.

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mazza
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Rich27
Wed Jul 22, 2009 8:40 pm

I have changed the fuel filter under 5000 miles ago. And run injector cleaner, all the way to RETRO (it did it on the way up)

Any ideas?
Hi Rich

I'm confused...was the engine running ok before you added the fuel injector cleaner?

you should change the fuel filter after you used the petrol/injector cleaning mixture that was in the tank anyways.

mazza


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Rich27
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Mazza, yes it was doing it before the injector cleaner, I was hoping that a good blast up to Retro would clear the problem,

I have found the problem
Plugs OK
Leads OK
Dizzy and cap OK

I turned the allen key for the mixture back 2mm and now it seems fine.
I think the air/fuel mix was a little too rich, as when I put my foot down I had the problems, if I put my foot down gently no stuttering.

(I did have to boot it 1/2 an hour ago to catch up with a certain members pink 2.5 16v :P and no stuttering B) )

Thanks for all the replys all
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